Clarify that the restore-keys input is a string in the docs (#1434)

* Fix Description for restore-keys at Readme

As previously the restore-keys were defined as an ordered lists which is
wrong as per the issue description where the actual format is a
multi-line string with one key per line.

* Added a space between the sentence of restore-keys description

While at the PR review it's been identified there's a need for a space
between the sentence

	```
	An ordered multiline string listing the prefix-matched keys,that are
	used for restoring stale cache if no cache hit occurred for key.
	```

where it's written as "prefix-matched keys,that are" this commit will
address the review comment and introduce a space between
"prefix-matched keys, that are" and change the sentence to

	```
	An ordered multiline string listing the prefix-matched keys, that are
        used for restoring stale cache if no cache hit occurred for key.
	```

* Change restore-keys description at cache/restore/action.yml and cache/action.yml

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+	"name": "Node.js & TypeScript",
+	"image": "mcr.microsoft.com/devcontainers/typescript-node:16-bullseye",
+	// Features to add to the dev container. More info: https://containers.dev/implementors/features.
+	// "features": {},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "npm install"
+	// Configure tool-specific properties.
+	// "customizations": {},
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.eslintrc.json

@@ -9,8 +9,14 @@
     "plugin:import/errors",
     "plugin:import/warnings",
     "plugin:import/typescript",
-    "plugin:prettier/recommended",
-    "prettier/@typescript-eslint"
+    "plugin:prettier/recommended"
   ],
-  "plugins": ["@typescript-eslint", "jest"]
+  "plugins": ["@typescript-eslint", "simple-import-sort", "jest"],
+  "rules": {
+    "import/first": "error",
+    "import/newline-after-import": "error",
+    "import/no-duplicates": "error",
+    "simple-import-sort/imports": "error",
+    "sort-imports": "off"
+  }
 }

.gitattributes

@@ -0,0 +1,2 @@
+.licenses/** -diff linguist-generated=true
+* text=auto eol=lf

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @actions/actions-cache

.github/pull_request_template.md

@@ -0,0 +1,32 @@
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation (add or update README or docs)
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the code style of this project.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have read the **CONTRIBUTING** document.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.

.github/workflows/check-dist.yml

@@ -0,0 +1,19 @@
+name: Check dist/
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+  workflow_dispatch:
+
+jobs:
+  call-check-dist:
+    name: Check dist/
+    uses: actions/reusable-workflows/.github/workflows/check-dist.yml@main
+    with:
+      node-version: "20.x"

.github/workflows/close-inactive-issues.yml

@@ -0,0 +1,22 @@
+name: Close inactive issues
+on:
+  schedule:
+    - cron: "30 8 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v3
+        with:
+          days-before-issue-stale: 200
+          days-before-issue-close: 5
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue is stale because it has been open for 200 days with no activity. Leave a comment to avoid closing this issue in 5 days."
+          close-issue-message: "This issue was closed because it has been inactive for 5 days since being marked as stale."
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/codeql.yml

@@ -0,0 +1,46 @@
+name: "Code scanning - action"
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 19 * * 0'
+
+jobs:
+  CodeQL-Build:
+    # CodeQL runs on ubuntu-latest, windows-latest, and macos-latest
+    runs-on: ubuntu-latest
+
+    permissions:
+      # required for all workflows
+      security-events: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      # Override language selection by uncommenting this and choosing your languages
+      # with:
+      #   languages: go, javascript, csharp, python, cpp, java, ruby
+
+    # Autobuild attempts to build any compiled languages (C/C++, C#, Go, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below).
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following
+    #    three lines and modify them (or add more) to build your code if your
+    #    project uses a compiled language
+
+    #- run: |
+    #     make bootstrap
+    #     make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/issue-opened-workflow.yml

@@ -0,0 +1,16 @@
+name: Assign issue
+on:
+  issues:
+    types: [opened]
+jobs:
+  run-action:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get current oncall
+      id: oncall
+      run: |
+        echo "CURRENT=$(curl --request GET 'https://api.pagerduty.com/oncalls?include[]=users&schedule_ids[]=P5VG2BX&earliest=true' --header 'Authorization: Token token=${{ secrets.PAGERDUTY_TOKEN }}' --header 'Accept: application/vnd.pagerduty+json;version=2' --header 'Content-Type: application/json' | jq -r '.oncalls[].user.name')" >> $GITHUB_OUTPUT
+    
+    - name: add_assignees
+      run: |
+        curl -X POST -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN}}" https://api.github.com/repos/${{github.repository}}/issues/${{ github.event.issue.number}}/assignees -d '{"assignees":["${{steps.oncall.outputs.CURRENT}}"]}'

.github/workflows/licensed.yml

@@ -0,0 +1,15 @@
+name: Licensed
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  call-licensed:
+    name: Licensed
+    uses: actions/reusable-workflows/.github/workflows/licensed.yml@main

.github/workflows/pr-opened-workflow.yml

@@ -0,0 +1,20 @@
+name: Add Reviewer PR
+on:
+  pull_request_target:
+    types: [opened]
+jobs:
+  run-action:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get current oncall
+      id: oncall
+      run: |
+        echo "CURRENT=$(curl --request GET 'https://api.pagerduty.com/oncalls?include[]=users&schedule_ids[]=P5VG2BX&earliest=true' --header 'Authorization: Token token=${{ secrets.PAGERDUTY_TOKEN }}' --header 'Accept: application/vnd.pagerduty+json;version=2' --header 'Content-Type: application/json' | jq -r '.oncalls[].user.name')" >> $GITHUB_OUTPUT
+    
+    - name: Request Review
+      run: |
+        curl -X POST -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN}}" https://api.github.com/repos/${{github.repository}}/pulls/${{ github.event.pull_request.number}}/requested_reviewers -d '{"reviewers":["${{steps.oncall.outputs.CURRENT}}"]}'
+        
+    - name: Add Assignee
+      run: |
+        curl -X POST -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN}}" https://api.github.com/repos/${{github.repository}}/issues/${{ github.event.pull_request.number}}/assignees -d '{"assignees":["${{steps.oncall.outputs.CURRENT}}"]}'    

.github/workflows/release-new-action-version.yml

@@ -0,0 +1,28 @@
+name: Release new action version
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+    inputs:
+      TAG_NAME:
+        description: 'Tag name that the major tag will point to'
+        required: true
+
+env:
+  TAG_NAME: ${{ github.event.inputs.TAG_NAME || github.event.release.tag_name }}
+permissions:
+  contents: write
+
+jobs:
+  update_tag:
+    name: Update the major tag to include the ${{ github.event.inputs.TAG_NAME || github.event.release.tag_name }} changes
+    environment:
+      name: releaseNewActionVersion
+    runs-on: ubuntu-latest
+    steps:
+    - name: Update the ${{ env.TAG_NAME }} tag
+      id: update-major-tag
+      uses: actions/publish-action@v0.3.0
+      with:
+        source-tag: ${{ env.TAG_NAME }}
+        slack-webhook: ${{ secrets.SLACK_WEBHOOK }}

.github/workflows/workflow.yml

@@ -3,52 +3,127 @@ name: Tests
 on:
   pull_request:
     branches:
-      - master
-    paths-ignore:
-      - '**.md'
+      - main
+      - releases/**
   push:
     branches:
-      - master
-    paths-ignore:
-      - '**.md'
+      - main
+      - releases/**
 
 jobs:
-  test:
-    name: Test on ${{ matrix.os }}
-
+  # Build and unit test
+  build:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
       fail-fast: false
-
     runs-on: ${{ matrix.os }}
-
     steps:
-    - uses: actions/checkout@v1
-
-    - uses: actions/setup-node@v1
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Setup Node.js 20.x
+      uses: actions/setup-node@v3
       with:
-        node-version: '12.x'
-
-    - name: Get npm cache directory
-      id: npm-cache
-      run: |
-        echo "::set-output name=dir::$(npm config get cache)"
-
-    - uses: actions/cache@v1
-      with:
-        path: ${{ steps.npm-cache.outputs.dir }}
-        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-        restore-keys: |
-          ${{ runner.os }}-node-
-
+        node-version: 20.x
+        cache: npm
     - run: npm ci
-
     - name: Prettier Format Check
       run: npm run format-check
-
     - name: ESLint Check
       run: npm run lint
-
     - name: Build & Test
       run: npm run test
+
+  # End to end save and restore
+  test-save:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Generate files in working directory
+      shell: bash
+      run: __tests__/create-cache-files.sh ${{ runner.os }} test-cache
+    - name: Generate files outside working directory
+      shell: bash
+      run: __tests__/create-cache-files.sh ${{ runner.os }} ~/test-cache
+    - name: Save cache
+      uses: ./
+      with:
+        key: test-${{ runner.os }}-${{ github.run_id }}
+        path: |
+          test-cache
+          ~/test-cache
+  test-restore:
+    needs: test-save
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Restore cache
+      uses: ./
+      with:
+        key: test-${{ runner.os }}-${{ github.run_id }}
+        path: |
+          test-cache
+          ~/test-cache
+    - name: Verify cache files in working directory
+      shell: bash
+      run: __tests__/verify-cache-files.sh ${{ runner.os }} test-cache
+    - name: Verify cache files outside working directory
+      shell: bash
+      run: __tests__/verify-cache-files.sh ${{ runner.os }} ~/test-cache
+
+  # End to end with proxy
+  test-proxy-save:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:latest
+      options: --dns 127.0.0.1
+    services:
+      squid-proxy:
+        image: ubuntu/squid:latest
+        ports:
+          - 3128:3128
+    env:
+      https_proxy: http://squid-proxy:3128
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Generate files
+      run: __tests__/create-cache-files.sh proxy test-cache
+    - name: Save cache
+      uses: ./
+      with:
+        key: test-proxy-${{ github.run_id }}
+        path: test-cache
+  test-proxy-restore:
+    needs: test-proxy-save
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:latest
+      options: --dns 127.0.0.1
+    services:
+      squid-proxy:
+        image: ubuntu/squid:latest
+        ports:
+          - 3128:3128
+    env:
+      https_proxy: http://squid-proxy:3128
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Restore cache
+      uses: ./
+      with:
+        key: test-proxy-${{ github.run_id }}
+        path: test-cache
+    - name: Verify cache
+      run: __tests__/verify-cache-files.sh proxy test-cache

.gitignore

@@ -1,8 +1,5 @@
 __tests__/runner/*
 
-# comment out in distribution branches
-dist/
-
 node_modules/
 lib/
 

.licensed.yml

@@ -0,0 +1,16 @@
+sources:
+  npm: true
+
+allowed:
+  - apache-2.0
+  - bsd-2-clause
+  - bsd-3-clause
+  - isc
+  - mit
+  - cc0-1.0
+  - unlicense
+  - 0bsd
+
+reviewed:
+  npm:
+  - sax

CONTRIBUTING.md

@@ -27,6 +27,10 @@ Here are a few things you can do that will increase the likelihood of your pull
 - Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, consider submitting them as separate pull requests.
 - Write a [good commit message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
 
+## Licensed
+
+This repository uses a tool called [Licensed](https://github.com/github/licensed) to verify third party dependencies. You may need to locally install licensed and run `licensed cache` to update the dependency cache if you install or update a production dependency. If licensed cache is unable to determine the dependency, you may need to modify the cache file yourself to put the correct license. You should still verify the dependency, licensed is a tool to help, but is not a substitute for human review of dependencies.
+
 ## Resources
 
 - [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)

README.md

@@ -1,31 +1,85 @@
-# cache
+# Cache action
 
 This action allows caching dependencies and build outputs to improve workflow execution time.
 
-<a href="https://github.com/actions/cache/actions?query=workflow%3ATests"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg?branch=master&event=push"></a>
+>Two other actions are available in addition to the primary `cache` action:
+>* [Restore action](./restore/README.md)
+>* [Save action](./save/README.md)
+
+[![Tests](https://github.com/actions/cache/actions/workflows/workflow.yml/badge.svg)](https://github.com/actions/cache/actions/workflows/workflow.yml)
 
 ## Documentation
 
-See ["Caching dependencies to speed up workflows"](https://help.github.com/github/automating-your-workflow-with-github-actions/caching-dependencies-to-speed-up-workflows).
+See ["Caching dependencies to speed up workflows"](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows).
+
+## What's New
+
+### v4
+
+* Updated to node 20
+* Added a `save-always` flag to save the cache even if a prior step fails
+
+### v3
+
+* Added support for caching in GHES 3.5+.
+* Fixed download issue for files > 2GB during restore.
+* Updated the minimum runner version support from node 12 -> node 16.
+* Fixed avoiding empty cache save when no files are available for caching.
+* Fixed tar creation error while trying to create tar with path as `~/` home folder on `ubuntu-latest`.
+* Fixed zstd failing on amazon linux 2.0 runners.
+* Fixed cache not working with github workspace directory or current directory.
+* Fixed the download stuck problem by introducing a timeout of 1 hour for cache downloads.
+* Fix zstd not working for windows on gnu tar in issues.
+* Allowing users to provide a custom timeout as input for aborting download of a cache segment using an environment variable `SEGMENT_DOWNLOAD_TIMEOUT_MINS`. Default is 10 minutes.
+* New actions are available for granular control over caches - [restore](restore/action.yml) and [save](save/action.yml).
+* Support cross-os caching as an opt-in feature. See [Cross OS caching](./tips-and-workarounds.md#cross-os-cache) for more info.
+* Added option to fail job on cache miss. See [Exit workflow on cache miss](./restore/README.md#exit-workflow-on-cache-miss) for more info.
+* Fix zstd not being used after zstd version upgrade to 1.5.4 on hosted runners
+* Added option to lookup cache without downloading it.
+* Reduced segment size to 128MB and segment timeout to 10 minutes to fail fast in case the cache download is stuck.
+
+See the [v2 README.md](https://github.com/actions/cache/blob/v2/README.md) for older updates.
 
 ## Usage
 
 ### Pre-requisites
-Create a workflow `.yml` file in your repositories `.github/workflows` directory. An [example workflow](#example-workflow) is available below. For more information, reference the GitHub Help Documentation for [Creating a workflow file](https://help.github.com/en/articles/configuring-a-workflow#creating-a-workflow-file).
+
+Create a workflow `.yml` file in your repository's `.github/workflows` directory. An [example workflow](#example-cache-workflow) is available below. For more information, see the GitHub Help Documentation for [Creating a workflow file](https://help.github.com/en/articles/configuring-a-workflow#creating-a-workflow-file).
+
+If you are using this inside a container, a POSIX-compliant `tar` needs to be included and accessible from the execution path.
+
+If you are using a `self-hosted` Windows runner, `GNU tar` and `zstd` are required for [Cross-OS caching](https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cross-os-cache) to work. They are also recommended to be installed in general so the performance is on par with `hosted` Windows runners.
 
 ### Inputs
 
-* `path` - A directory to store and save the cache
-* `key` - An explicit key for restoring and saving the cache
-* `restore-keys` - An ordered list of keys to use for restoring the cache if no cache hit occurred for key
+* `key` - An explicit key for a cache entry. See [creating a cache key](#creating-a-cache-key).
+* `path` - A list of files, directories, and wildcard patterns to cache and restore. See [`@actions/glob`](https://github.com/actions/toolkit/tree/main/packages/glob) for supported patterns.
+* `restore-keys` - An ordered multiline string listing the prefix-matched keys, that are used for restoring stale cache if no cache hit occurred for key.
+* `enableCrossOsArchive` - An optional boolean when enabled, allows Windows runners to save or restore caches that can be restored or saved respectively on other platforms. Default: `false`
+* `fail-on-cache-miss` - Fail the workflow if cache entry is not found. Default: `false`
+* `lookup-only` - If true, only checks if cache entry exists and skips download. Does not change save cache behavior. Default: `false`
+
+#### Environment Variables
+
+* `SEGMENT_DOWNLOAD_TIMEOUT_MINS` - Segment download timeout (in minutes, default `10`) to abort download of the segment if not completed in the defined number of minutes. [Read more](https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout)
 
 ### Outputs
 
-* `cache-hit` - A boolean value to indicate an exact match was found for the key
+* `cache-hit` - A boolean value to indicate an exact match was found for the key.
 
-> See [Skipping steps based on cache-hit](#Skipping-steps-based-on-cache-hit) for info on using this output
+    > **Note** `cache-hit` will only be set to `true` when a cache hit occurs for the exact `key` match. For a partial key match via `restore-keys` or a cache miss, it will be set to `false`.
 
-### Example workflow
+See [Skipping steps based on cache-hit](#skipping-steps-based-on-cache-hit) for info on using this output
+
+### Cache scopes
+
+The cache is scoped to the key, [version](#cache-version), and branch. The default branch cache is available to other branches.
+
+See [Matching a cache key](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#matching-a-cache-key) for more info.
+
+### Example cache workflow
+
+#### Restoring and saving cache using a single action
 
 ```yaml
 name: Caching Primes
@@ -37,11 +91,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
 
     - name: Cache Primes
       id: cache-primes
-      uses: actions/cache@v1
+      uses: actions/cache@v4
       with:
         path: prime-numbers
         key: ${{ runner.os }}-primes
@@ -54,44 +108,130 @@ jobs:
       run: /primes.sh -d prime-numbers
 ```
 
+The `cache` action provides a `cache-hit` output which is set to `true` when the cache is restored using the primary `key` and `false` when the cache is restored using `restore-keys` or no cache is restored.
+
+#### Using a combination of restore and save actions
+
+```yaml
+name: Caching Primes
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Restore cached Primes
+      id: cache-primes-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: |
+          path/to/dependencies
+          some/other/dependencies
+        key: ${{ runner.os }}-primes
+    .
+    . //intermediate workflow steps
+    .
+    - name: Save Primes
+      id: cache-primes-save
+      uses: actions/cache/save@v4
+      with:
+        path: |
+          path/to/dependencies
+          some/other/dependencies
+        key: ${{ steps.cache-primes-restore.outputs.cache-primary-key }}
+```
+
+> **Note**
+> You must use the `cache` or `restore` action in your workflow before you need to use the files that might be restored from the cache. If the provided `key` matches an existing cache, a new cache is not created and if the provided `key` doesn't match an existing cache, a new cache is automatically created provided the job completes successfully.
+
+## Caching Strategies
+
+With the introduction of the `restore` and `save` actions, a lot of caching use cases can now be achieved. Please see the [caching strategies](./caching-strategies.md) document for understanding how you can use the actions strategically to achieve the desired goal.
+
 ## Implementation Examples
 
 Every programming language and framework has its own way of caching.
 
 See [Examples](examples.md) for a list of `actions/cache` implementations for use with:
 
-- [C# - Nuget](./examples.md#c---nuget)
-- [Elixir - Mix](./examples.md#elixir---mix)
-- [Go - Modules](./examples.md#go---modules)
-- [Haskell - Cabal](./examples.md#haskell---cabal)
-- [Java - Gradle](./examples.md#java---gradle)
-- [Java - Maven](./examples.md#java---maven)
-- [Node - npm](./examples.md#node---npm)
-- [Node - Yarn](./examples.md#node---yarn)
-- [PHP - Composer](./examples.md#php---composer)
-- [Python - pip](./examples.md#python---pip)
-- [R - renv](./examples.md#r---renv)
-- [Ruby - Bundler](./examples.md#ruby---bundler)
-- [Rust - Cargo](./examples.md#rust---cargo)
-- [Scala - SBT](./examples.md#scala---sbt)
-- [Swift, Objective-C - Carthage](./examples.md#swift-objective-c---carthage)
-- [Swift, Objective-C - CocoaPods](./examples.md#swift-objective-c---cocoapods)
-- [Swift - Swift Package Manager](./examples.md#swift---swift-package-manager)
+* [C# - NuGet](./examples.md#c---nuget)
+* [Clojure - Lein Deps](./examples.md#clojure---lein-deps)
+* [D - DUB](./examples.md#d---dub)
+* [Deno](./examples.md#deno)
+* [Elixir - Mix](./examples.md#elixir---mix)
+* [Go - Modules](./examples.md#go---modules)
+* [Haskell - Cabal](./examples.md#haskell---cabal)
+* [Haskell - Stack](./examples.md#haskell---stack)
+* [Java - Gradle](./examples.md#java---gradle)
+* [Java - Maven](./examples.md#java---maven)
+* [Node - npm](./examples.md#node---npm)
+* [Node - Lerna](./examples.md#node---lerna)
+* [Node - Yarn](./examples.md#node---yarn)
+* [OCaml/Reason - esy](./examples.md#ocamlreason---esy)
+* [PHP - Composer](./examples.md#php---composer)
+* [Python - pip](./examples.md#python---pip)
+* [Python - pipenv](./examples.md#python---pipenv)
+* [R - renv](./examples.md#r---renv)
+* [Ruby - Bundler](./examples.md#ruby---bundler)
+* [Rust - Cargo](./examples.md#rust---cargo)
+* [Scala - SBT](./examples.md#scala---sbt)
+* [Swift, Objective-C - Carthage](./examples.md#swift-objective-c---carthage)
+* [Swift, Objective-C - CocoaPods](./examples.md#swift-objective-c---cocoapods)
+* [Swift - Swift Package Manager](./examples.md#swift---swift-package-manager)
+* [Swift - Mint](./examples.md#swift---mint)
+
+## Creating a cache key
+
+A cache key can include any of the contexts, functions, literals, and operators supported by GitHub Actions.
+
+For example, using the [`hashFiles`](https://docs.github.com/en/actions/learn-github-actions/expressions#hashfiles) function allows you to create a new cache when dependencies change.
+
+```yaml
+  - uses: actions/cache@v4
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+Additionally, you can use arbitrary command output in a cache key, such as a date or software version:
+
+```yaml
+  # http://man7.org/linux/man-pages/man1/date.1.html
+  - name: Get Date
+    id: get-date
+    run: |
+      echo "date=$(/bin/date -u "+%Y%m%d")" >> $GITHUB_OUTPUT
+    shell: bash
+
+  - uses: actions/cache@v4
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ steps.get-date.outputs.date }}-${{ hashFiles('**/lockfiles') }}
+```
+
+See [Using contexts to create cache keys](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#using-contexts-to-create-cache-keys)
 
 ## Cache Limits
 
-A repository can have up to 5GB of caches. Once the 5GB limit is reached, older caches will be evicted based on when the cache was last accessed.  Caches that are not accessed within the last week will also be evicted.
+A repository can have up to 10GB of caches. Once the 10GB limit is reached, older caches will be evicted based on when the cache was last accessed.  Caches that are not accessed within the last week will also be evicted.
 
 ## Skipping steps based on cache-hit
 
-Using the `cache-hit` output, subsequent steps (such as install or build) can be skipped when a cache hit occurs on the key.
+Using the `cache-hit` output, subsequent steps (such as install or build) can be skipped when a cache hit occurs on the key.  It is recommended to install missing/updated dependencies in case of a partial key match when the key is dependent on the `hash` of the package file.
 
 Example:
+
 ```yaml
 steps:
-  - uses: actions/checkout@v1
+  - uses: actions/checkout@v4
 
-  - uses: actions/cache@v1
+  - uses: actions/cache@v4
     id: cache
     with:
       path: path/to/dependencies
@@ -102,10 +242,84 @@ steps:
     run: /install.sh
 ```
 
-> Note: The `id` defined in `actions/cache` must match the `id` in the `if` statement (i.e. `steps.[ID].outputs.cache-hit`)
+> **Note** The `id` defined in `actions/cache` must match the `id` in the `if` statement (i.e. `steps.[ID].outputs.cache-hit`)
+
+## Cache Version
+
+Cache version is a hash [generated](https://github.com/actions/toolkit/blob/500d0b42fee2552ae9eeb5933091fe2fbf14e72d/packages/cache/src/internal/cacheHttpClient.ts#L73-L90) for a combination of compression tool used (Gzip, Zstd, etc. based on the runner OS) and the `path` of directories being cached. If two caches have different versions, they are identified as unique caches while matching. This, for example, means that a cache created on a `windows-latest` runner can't be restored on `ubuntu-latest` as cache `Version`s are different.
+
+> Pro tip: The [list caches](https://docs.github.com/en/rest/actions/cache#list-github-actions-caches-for-a-repository) API can be used to get the version of a cache. This can be helpful to troubleshoot cache miss due to version.
+
+<details>
+  <summary>Example</summary>
+The workflow will create 3 unique caches with same keys. Ubuntu and windows runners will use different compression technique and hence create two different caches. And `build-linux` will create two different caches as the `paths` are different.
+
+```yaml
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache Primes
+        id: cache-primes
+        uses: actions/cache@v4
+        with:
+          path: prime-numbers
+          key: primes
+
+      - name: Generate Prime Numbers
+        if: steps.cache-primes.outputs.cache-hit != 'true'
+        run: ./generate-primes.sh -d prime-numbers
+
+      - name: Cache Numbers
+        id: cache-numbers
+        uses: actions/cache@v4
+        with:
+          path: numbers
+          key: primes
+
+      - name: Generate Numbers
+        if: steps.cache-numbers.outputs.cache-hit != 'true'
+        run: ./generate-primes.sh -d numbers
+
+  build-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache Primes
+        id: cache-primes
+        uses: actions/cache@v4
+        with:
+          path: prime-numbers
+          key: primes
+
+      - name: Generate Prime Numbers
+        if: steps.cache-primes.outputs.cache-hit != 'true'
+        run: ./generate-primes -d prime-numbers
+```
+
+</details>
+
+## Known practices and workarounds
+
+There are a number of community practices/workarounds to fulfill specific requirements. You may choose to use them if they suit your use case. Note these are not necessarily the only solution or even a recommended solution.
+
+* [Cache segment restore timeout](./tips-and-workarounds.md#cache-segment-restore-timeout)
+* [Update a cache](./tips-and-workarounds.md#update-a-cache)
+* [Use cache across feature branches](./tips-and-workarounds.md#use-cache-across-feature-branches)
+* [Cross OS cache](./tips-and-workarounds.md#cross-os-cache)
+* [Force deletion of caches overriding default cache eviction policy](./tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy)
+
+### Windows environment variables
+
+Please note that Windows environment variables (like `%LocalAppData%`) will NOT be expanded by this action. Instead, prefer using `~` in your paths which will expand to the HOME directory. For example, instead of `%LocalAppData%`, use `~\AppData\Local`. For a list of supported default environment variables, see the [Learn GitHub Actions: Variables](https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables) page.
 
 ## Contributing
-We would love for you to contribute to `@actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
+
+We would love for you to contribute to `actions/cache`. Pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
 
 ## License
+
 The scripts and documentation in this project are released under the [MIT License](LICENSE)

RELEASES.md

@@ -0,0 +1,130 @@
+# Releases
+
+### 4.0.2
+
+- Fixed restore `fail-on-cache-miss` not working.
+
+### 4.0.1
+
+- Updated `isGhes` check
+
+### 4.0.0
+
+- Updated minimum runner version support from node 12 -> node 20
+
+### 3.3.3
+
+- Updates @actions/cache to v3.2.3 to fix accidental mutated path arguments to `getCacheVersion` [actions/toolkit#1378](https://github.com/actions/toolkit/pull/1378)
+- Additional audit fixes of npm package(s)
+
+### 3.3.2
+
+- Fixes bug with Azure SDK causing blob downloads to get stuck.
+
+### 3.3.1
+
+- Reduced segment size to 128MB and segment timeout to 10 minutes to fail fast in case the cache download is stuck.
+
+### 3.3.0
+
+- Added option to lookup cache without downloading it.
+
+### 3.2.6
+
+- Fix zstd not being used after zstd version upgrade to 1.5.4 on hosted runners.
+
+### 3.2.5
+
+- Added fix to prevent from setting MYSYS environment variable globally.
+
+### 3.2.4
+
+- Added option to fail job on cache miss.
+
+### 3.2.3
+
+- Support cross os caching on Windows as an opt-in feature.
+- Fix issue with symlink restoration on Windows for cross-os caches.
+
+### 3.2.2
+
+- Reverted the changes made in 3.2.1 to use gnu tar and zstd by default on windows.
+
+### 3.2.1
+
+- Update `@actions/cache` on windows to use gnu tar and zstd by default and fallback to bsdtar and zstd if gnu tar is not available. ([issue](https://github.com/actions/cache/issues/984))
+- Added support for fallback to gzip to restore old caches on windows.
+- Added logs for cache version in case of a cache miss.
+
+### 3.2.0
+
+- Released the two new actions - [restore](restore/action.yml) and [save](save/action.yml) for granular control on cache
+
+### 3.2.0-beta.1
+
+- Added two new actions - [restore](restore/action.yml) and [save](save/action.yml) for granular control on cache.
+
+### 3.1.0-beta.3
+
+- Bug fixes for bsdtar fallback if gnutar not available and gzip fallback if cache saved using old cache action on windows.
+
+### 3.1.0-beta.2
+
+- Added support for fallback to gzip to restore old caches on windows.
+
+### 3.1.0-beta.1
+
+- Update `@actions/cache` on windows to use gnu tar and zstd by default and fallback to bsdtar and zstd if gnu tar is not available. ([issue](https://github.com/actions/cache/issues/984))
+
+### 3.0.11
+
+- Update toolkit version to 3.0.5 to include `@actions/core@^1.10.0`
+- Update `@actions/cache` to use updated `saveState` and `setOutput` functions from `@actions/core@^1.10.0`
+
+### 3.0.10
+
+- Fix a bug with sorting inputs.
+- Update definition for restore-keys in README.md
+
+### 3.0.9
+
+- Enhanced the warning message for cache unavailablity in case of GHES.
+
+### 3.0.8
+
+- Fix zstd not working for windows on gnu tar in issues [#888](https://github.com/actions/cache/issues/888) and [#891](https://github.com/actions/cache/issues/891).
+- Allowing users to provide a custom timeout as input for aborting download of a cache segment using an environment variable `SEGMENT_DOWNLOAD_TIMEOUT_MINS`. Default is 60 minutes.
+
+### 3.0.7
+
+- Fixed [#810](https://github.com/actions/cache/issues/810) - download stuck issue. A new timeout is introduced in the download process to abort the download if it gets stuck and doesn't finish within an hour.
+
+### 3.0.6
+
+- Fixed [#809](https://github.com/actions/cache/issues/809) - zstd -d: no such file or directory error
+- Fixed [#833](https://github.com/actions/cache/issues/833) - cache doesn't work with github workspace directory
+
+### 3.0.5
+
+- Removed error handling by consuming actions/cache 3.0 toolkit, Now cache server error handling will be done by toolkit. ([PR](https://github.com/actions/cache/pull/834))
+
+### 3.0.4
+
+- Fixed tar creation error while trying to create tar with path as `~/` home folder on `ubuntu-latest`. ([issue](https://github.com/actions/cache/issues/689))
+
+### 3.0.3
+
+- Fixed avoiding empty cache save when no files are available for caching. ([issue](https://github.com/actions/cache/issues/624))
+
+### 3.0.2
+
+- Added support for dynamic cache size cap on GHES.
+
+### 3.0.1
+
+- Added support for caching from GHES 3.5.
+- Fixed download issue for files > 2GB during restore.
+
+### 3.0.0
+
+- Updated minimum runner version support from node 12 -> node 16

__tests__/actionUtils.test.ts

@@ -1,165 +1,82 @@
+import * as cache from "@actions/cache";
 import * as core from "@actions/core";
-import * as os from "os";
-import * as path from "path";
 
-import { Events, Outputs, State } from "../src/constants";
-import { ArtifactCacheEntry } from "../src/contracts";
+import { Events, RefKey } from "../src/constants";
 import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
 
 jest.mock("@actions/core");
-jest.mock("os");
+jest.mock("@actions/cache");
+
+beforeAll(() => {
+    jest.spyOn(core, "getInput").mockImplementation((name, options) => {
+        return jest.requireActual("@actions/core").getInput(name, options);
+    });
+});
 
 afterEach(() => {
     delete process.env[Events.Key];
+    delete process.env[RefKey];
 });
 
-test("getArchiveFileSize returns file size", () => {
-    const filePath = path.join(__dirname, "__fixtures__", "helloWorld.txt");
-
-    const size = actionUtils.getArchiveFileSize(filePath);
-
-    expect(size).toBe(11);
+test("isGhes returns true if server url is not github.com", () => {
+    try {
+        process.env["GITHUB_SERVER_URL"] = "http://example.com";
+        expect(actionUtils.isGhes()).toBe(true);
+    } finally {
+        process.env["GITHUB_SERVER_URL"] = undefined;
+    }
 });
 
-test("isExactKeyMatch with undefined cache entry returns false", () => {
+test("isGhes returns false when server url is github.com", () => {
+    try {
+        process.env["GITHUB_SERVER_URL"] = "http://github.com";
+        expect(actionUtils.isGhes()).toBe(false);
+    } finally {
+        process.env["GITHUB_SERVER_URL"] = undefined;
+    }
+});
+
+test("isExactKeyMatch with undefined cache key returns false", () => {
     const key = "linux-rust";
-    const cacheEntry = undefined;
+    const cacheKey = undefined;
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(false);
 });
 
-test("isExactKeyMatch with empty cache entry returns false", () => {
+test("isExactKeyMatch with empty cache key returns false", () => {
     const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {};
+    const cacheKey = "";
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(false);
 });
 
 test("isExactKeyMatch with different keys returns false", () => {
     const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "linux-"
-    };
+    const cacheKey = "linux-";
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(false);
 });
 
 test("isExactKeyMatch with different key accents returns false", () => {
     const key = "linux-áccent";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "linux-accent"
-    };
+    const cacheKey = "linux-accent";
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(false);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(false);
 });
 
 test("isExactKeyMatch with same key returns true", () => {
     const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "linux-rust"
-    };
+    const cacheKey = "linux-rust";
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(true);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(true);
 });
 
 test("isExactKeyMatch with same key and different casing returns true", () => {
     const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "LINUX-RUST"
-    };
+    const cacheKey = "LINUX-RUST";
 
-    expect(actionUtils.isExactKeyMatch(key, cacheEntry)).toBe(true);
-});
-
-test("setOutputAndState with undefined entry to set cache-hit output", () => {
-    const key = "linux-rust";
-    const cacheEntry = undefined;
-
-    const setOutputMock = jest.spyOn(core, "setOutput");
-    const saveStateMock = jest.spyOn(core, "saveState");
-
-    actionUtils.setOutputAndState(key, cacheEntry);
-
-    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "false");
-    expect(setOutputMock).toHaveBeenCalledTimes(1);
-
-    expect(saveStateMock).toHaveBeenCalledTimes(0);
-});
-
-test("setOutputAndState with exact match to set cache-hit output and state", () => {
-    const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "linux-rust"
-    };
-
-    const setOutputMock = jest.spyOn(core, "setOutput");
-    const saveStateMock = jest.spyOn(core, "saveState");
-
-    actionUtils.setOutputAndState(key, cacheEntry);
-
-    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "true");
-    expect(setOutputMock).toHaveBeenCalledTimes(1);
-
-    expect(saveStateMock).toHaveBeenCalledWith(
-        State.CacheResult,
-        JSON.stringify(cacheEntry)
-    );
-    expect(saveStateMock).toHaveBeenCalledTimes(1);
-});
-
-test("setOutputAndState with no exact match to set cache-hit output and state", () => {
-    const key = "linux-rust";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "linux-rust-bb828da54c148048dd17899ba9fda624811cfb43"
-    };
-
-    const setOutputMock = jest.spyOn(core, "setOutput");
-    const saveStateMock = jest.spyOn(core, "saveState");
-
-    actionUtils.setOutputAndState(key, cacheEntry);
-
-    expect(setOutputMock).toHaveBeenCalledWith(Outputs.CacheHit, "false");
-    expect(setOutputMock).toHaveBeenCalledTimes(1);
-
-    expect(saveStateMock).toHaveBeenCalledWith(
-        State.CacheResult,
-        JSON.stringify(cacheEntry)
-    );
-    expect(saveStateMock).toHaveBeenCalledTimes(1);
-});
-
-test("getCacheState with no state returns undefined", () => {
-    const getStateMock = jest.spyOn(core, "getState");
-    getStateMock.mockImplementation(() => {
-        return "";
-    });
-
-    const state = actionUtils.getCacheState();
-
-    expect(state).toBe(undefined);
-
-    expect(getStateMock).toHaveBeenCalledWith(State.CacheResult);
-    expect(getStateMock).toHaveBeenCalledTimes(1);
-});
-
-test("getCacheState with valid state", () => {
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-    const getStateMock = jest.spyOn(core, "getState");
-    getStateMock.mockImplementation(() => {
-        return JSON.stringify(cacheEntry);
-    });
-
-    const state = actionUtils.getCacheState();
-
-    expect(state).toEqual(cacheEntry);
-
-    expect(getStateMock).toHaveBeenCalledWith(State.CacheResult);
-    expect(getStateMock).toHaveBeenCalledTimes(1);
+    expect(actionUtils.isExactKeyMatch(key, cacheKey)).toBe(true);
 });
 
 test("logWarning logs a message with a warning prefix", () => {
@@ -172,7 +89,7 @@ test("logWarning logs a message with a warning prefix", () => {
     expect(infoMock).toHaveBeenCalledWith(`[warning]${message}`);
 });
 
-test("isValidEvent returns false for unknown event", () => {
+test("isValidEvent returns false for event that does not have a branch or tag", () => {
     const event = "foo";
     process.env[Events.Key] = event;
 
@@ -181,56 +98,136 @@ test("isValidEvent returns false for unknown event", () => {
     expect(isValidEvent).toBe(false);
 });
 
-test("resolvePath with no ~ in path", () => {
-    const filePath = ".cache/yarn";
-
-    const resolvedPath = actionUtils.resolvePath(filePath);
-
-    const expectedPath = path.resolve(filePath);
-    expect(resolvedPath).toBe(expectedPath);
-});
-
-test("resolvePath with ~ in path", () => {
-    const filePath = "~/.cache/yarn";
-
-    const homedir = jest.requireActual("os").homedir();
-    const homedirMock = jest.spyOn(os, "homedir");
-    homedirMock.mockImplementation(() => {
-        return homedir;
-    });
-
-    const resolvedPath = actionUtils.resolvePath(filePath);
-
-    const expectedPath = path.join(homedir, ".cache/yarn");
-    expect(resolvedPath).toBe(expectedPath);
-});
-
-test("resolvePath with home not found", () => {
-    const filePath = "~/.cache/yarn";
-    const homedirMock = jest.spyOn(os, "homedir");
-    homedirMock.mockImplementation(() => {
-        return "";
-    });
-
-    expect(() => actionUtils.resolvePath(filePath)).toThrow(
-        "Unable to resolve `~` to HOME"
-    );
-});
-
-test("isValidEvent returns true for push event", () => {
+test("isValidEvent returns true for event that has a ref", () => {
     const event = Events.Push;
     process.env[Events.Key] = event;
+    process.env[RefKey] = "ref/heads/feature";
 
     const isValidEvent = actionUtils.isValidEvent();
 
     expect(isValidEvent).toBe(true);
 });
 
-test("isValidEvent returns true for pull request event", () => {
-    const event = Events.PullRequest;
-    process.env[Events.Key] = event;
-
-    const isValidEvent = actionUtils.isValidEvent();
-
-    expect(isValidEvent).toBe(true);
+test("getInputAsArray returns empty array if not required and missing", () => {
+    expect(actionUtils.getInputAsArray("foo")).toEqual([]);
+});
+
+test("getInputAsArray throws error if required and missing", () => {
+    expect(() =>
+        actionUtils.getInputAsArray("foo", { required: true })
+    ).toThrowError();
+});
+
+test("getInputAsArray handles single line correctly", () => {
+    testUtils.setInput("foo", "bar");
+    expect(actionUtils.getInputAsArray("foo")).toEqual(["bar"]);
+});
+
+test("getInputAsArray handles multiple lines correctly", () => {
+    testUtils.setInput("foo", "bar\nbaz");
+    expect(actionUtils.getInputAsArray("foo")).toEqual(["bar", "baz"]);
+});
+
+test("getInputAsArray handles different new lines correctly", () => {
+    testUtils.setInput("foo", "bar\r\nbaz");
+    expect(actionUtils.getInputAsArray("foo")).toEqual(["bar", "baz"]);
+});
+
+test("getInputAsArray handles empty lines correctly", () => {
+    testUtils.setInput("foo", "\n\nbar\n\nbaz\n\n");
+    expect(actionUtils.getInputAsArray("foo")).toEqual(["bar", "baz"]);
+});
+
+test("getInputAsArray removes spaces after ! at the beginning", () => {
+    testUtils.setInput(
+        "foo",
+        "!   bar\n!  baz\n! qux\n!quux\ncorge\ngrault! garply\n!\r\t waldo"
+    );
+    expect(actionUtils.getInputAsArray("foo")).toEqual([
+        "!bar",
+        "!baz",
+        "!qux",
+        "!quux",
+        "corge",
+        "grault! garply",
+        "!waldo"
+    ]);
+});
+
+test("getInputAsInt returns undefined if input not set", () => {
+    expect(actionUtils.getInputAsInt("undefined")).toBeUndefined();
+});
+
+test("getInputAsInt returns value if input is valid", () => {
+    testUtils.setInput("foo", "8");
+    expect(actionUtils.getInputAsInt("foo")).toBe(8);
+});
+
+test("getInputAsInt returns undefined if input is invalid or NaN", () => {
+    testUtils.setInput("foo", "bar");
+    expect(actionUtils.getInputAsInt("foo")).toBeUndefined();
+});
+
+test("getInputAsInt throws if required and value missing", () => {
+    expect(() =>
+        actionUtils.getInputAsInt("undefined", { required: true })
+    ).toThrowError();
+});
+
+test("getInputAsBool returns false if input not set", () => {
+    expect(actionUtils.getInputAsBool("undefined")).toBe(false);
+});
+
+test("getInputAsBool returns value if input is valid", () => {
+    testUtils.setInput("foo", "true");
+    expect(actionUtils.getInputAsBool("foo")).toBe(true);
+});
+
+test("getInputAsBool returns false if input is invalid or NaN", () => {
+    testUtils.setInput("foo", "bar");
+    expect(actionUtils.getInputAsBool("foo")).toBe(false);
+});
+
+test("getInputAsBool throws if required and value missing", () => {
+    expect(() =>
+        actionUtils.getInputAsBool("undefined2", { required: true })
+    ).toThrowError();
+});
+
+test("isCacheFeatureAvailable for ac enabled", () => {
+    jest.spyOn(cache, "isFeatureAvailable").mockImplementation(() => true);
+
+    expect(actionUtils.isCacheFeatureAvailable()).toBe(true);
+});
+
+test("isCacheFeatureAvailable for ac disabled on GHES", () => {
+    jest.spyOn(cache, "isFeatureAvailable").mockImplementation(() => false);
+
+    const message = `Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.
+Otherwise please upgrade to GHES version >= 3.5 and If you are also using Github Connect, please unretire the actions/cache namespace before upgrade (see https://docs.github.com/en/enterprise-server@3.5/admin/github-actions/managing-access-to-actions-from-githubcom/enabling-automatic-access-to-githubcom-actions-using-github-connect#automatic-retirement-of-namespaces-for-actions-accessed-on-githubcom)`;
+    const infoMock = jest.spyOn(core, "info");
+
+    try {
+        process.env["GITHUB_SERVER_URL"] = "http://example.com";
+        expect(actionUtils.isCacheFeatureAvailable()).toBe(false);
+        expect(infoMock).toHaveBeenCalledWith(`[warning]${message}`);
+    } finally {
+        delete process.env["GITHUB_SERVER_URL"];
+    }
+});
+
+test("isCacheFeatureAvailable for ac disabled on dotcom", () => {
+    jest.spyOn(cache, "isFeatureAvailable").mockImplementation(() => false);
+
+    const message =
+        "An internal error has occurred in cache backend. Please check https://www.githubstatus.com/ for any ongoing issue in actions.";
+    const infoMock = jest.spyOn(core, "info");
+
+    try {
+        process.env["GITHUB_SERVER_URL"] = "http://github.com";
+        expect(actionUtils.isCacheFeatureAvailable()).toBe(false);
+        expect(infoMock).toHaveBeenCalledWith(`[warning]${message}`);
+    } finally {
+        delete process.env["GITHUB_SERVER_URL"];
+    }
 });

__tests__/create-cache-files.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Validate args
+prefix="$1"
+if [ -z "$prefix" ]; then
+  echo "Must supply prefix argument"
+  exit 1
+fi
+
+path="$2"
+if [ -z "$path" ]; then
+  echo "Must supply path argument"
+  exit 1
+fi
+
+mkdir -p $path
+echo "$prefix $GITHUB_RUN_ID" > $path/test-file.txt

__tests__/restore.test.ts

@@ -1,22 +1,14 @@
+import * as cache from "@actions/cache";
 import * as core from "@actions/core";
-import * as path from "path";
-import * as cacheHttpClient from "../src/cacheHttpClient";
-import { Events, Inputs } from "../src/constants";
-import { ArtifactCacheEntry } from "../src/contracts";
-import run from "../src/restore";
-import * as tar from "../src/tar";
+
+import { Events, RefKey } from "../src/constants";
+import { restoreRun } from "../src/restoreImpl";
 import * as actionUtils from "../src/utils/actionUtils";
 import * as testUtils from "../src/utils/testUtils";
 
-jest.mock("../src/cacheHttpClient");
-jest.mock("../src/tar");
 jest.mock("../src/utils/actionUtils");
 
 beforeAll(() => {
-    jest.spyOn(actionUtils, "resolvePath").mockImplementation(filePath => {
-        return path.resolve(filePath);
-    });
-
     jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
         (key, cacheResult) => {
             const actualUtils = jest.requireActual("../src/utils/actionUtils");
@@ -29,375 +21,338 @@ beforeAll(() => {
         return actualUtils.isValidEvent();
     });
 
-    jest.spyOn(actionUtils, "getSupportedEvents").mockImplementation(() => {
-        const actualUtils = jest.requireActual("../src/utils/actionUtils");
-        return actualUtils.getSupportedEvents();
-    });
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.getInputAsBool(name, options);
+        }
+    );
 });
 
 beforeEach(() => {
+    jest.restoreAllMocks();
     process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
 });
 
 afterEach(() => {
     testUtils.clearInputs();
     delete process.env[Events.Key];
-});
-
-test("restore with invalid event outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-    const invalidEvent = "commit_comment";
-    process.env[Events.Key] = invalidEvent;
-    await run();
-    expect(logWarningMock).toHaveBeenCalledWith(
-        `Event Validation Error: The event type ${invalidEvent} is not supported. Only push, pull_request events are supported at this time.`
-    );
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("restore with no path should fail", async () => {
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        "Input required and not supplied: path"
-    );
-});
-
-test("restore with no key", async () => {
-    testUtils.setInput(Inputs.Path, "node_modules");
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        "Input required and not supplied: key"
-    );
-});
-
-test("restore with too many keys should fail", async () => {
-    const key = "node-test";
-    const restoreKeys = [...Array(20).keys()].map(x => x.toString());
-    testUtils.setInputs({
-        path: "node_modules",
-        key,
-        restoreKeys
-    });
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        `Key Validation Error: Keys are limited to a maximum of 10.`
-    );
-});
-
-test("restore with large key should fail", async () => {
-    const key = "foo".repeat(512); // Over the 512 character limit
-    testUtils.setInputs({
-        path: "node_modules",
-        key
-    });
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        `Key Validation Error: ${key} cannot be larger than 512 characters.`
-    );
-});
-
-test("restore with invalid key should fail", async () => {
-    const key = "comma,comma";
-    testUtils.setInputs({
-        path: "node_modules",
-        key
-    });
-    const failedMock = jest.spyOn(core, "setFailed");
-    await run();
-    expect(failedMock).toHaveBeenCalledWith(
-        `Key Validation Error: ${key} cannot contain commas.`
-    );
+    delete process.env[RefKey];
 });
 
 test("restore with no cache found", async () => {
+    const path = "node_modules";
     const key = "node-test";
     testUtils.setInputs({
-        path: "node_modules",
-        key
+        path: path,
+        key,
+        enableCrossOsArchive: false
     });
 
     const infoMock = jest.spyOn(core, "info");
     const failedMock = jest.spyOn(core, "setFailed");
     const stateMock = jest.spyOn(core, "saveState");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
 
-    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(() => {
-        return Promise.resolve(null);
-    });
+    await restoreRun();
 
-    await run();
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
 
     expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(stateMock).toHaveBeenCalledTimes(1);
+
     expect(failedMock).toHaveBeenCalledTimes(0);
 
     expect(infoMock).toHaveBeenCalledWith(
-        `Cache not found for input keys: ${key}.`
+        `Cache not found for input keys: ${key}`
     );
 });
 
-test("restore with server error should fail", async () => {
-    const key = "node-test";
-    testUtils.setInputs({
-        path: "node_modules",
-        key
-    });
-
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-    const stateMock = jest.spyOn(core, "saveState");
-
-    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(() => {
-        throw new Error("HTTP Error Occurred");
-    });
-
-    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
-
-    await run();
-
-    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
-
-    expect(logWarningMock).toHaveBeenCalledTimes(1);
-    expect(logWarningMock).toHaveBeenCalledWith("HTTP Error Occurred");
-
-    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
-    expect(setCacheHitOutputMock).toHaveBeenCalledWith(false);
-
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
 test("restore with restore keys and no cache found", async () => {
+    const path = "node_modules";
     const key = "node-test";
     const restoreKey = "node-";
     testUtils.setInputs({
-        path: "node_modules",
+        path: path,
         key,
-        restoreKeys: [restoreKey]
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
     });
 
     const infoMock = jest.spyOn(core, "info");
     const failedMock = jest.spyOn(core, "setFailed");
     const stateMock = jest.spyOn(core, "saveState");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
 
-    const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(() => {
-        return Promise.resolve(null);
-    });
+    await restoreRun();
 
-    await run();
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
 
     expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(stateMock).toHaveBeenCalledTimes(1);
+
     expect(failedMock).toHaveBeenCalledTimes(0);
 
     expect(infoMock).toHaveBeenCalledWith(
-        `Cache not found for input keys: ${key}, ${restoreKey}.`
+        `Cache not found for input keys: ${key}, ${restoreKey}`
     );
 });
 
-test("restore with cache found", async () => {
+test("restore with cache found for key", async () => {
+    const path = "node_modules";
     const key = "node-test";
-    const cachePath = path.resolve("node_modules");
     testUtils.setInputs({
-        path: "node_modules",
-        key
+        path: path,
+        key,
+        enableCrossOsArchive: false
     });
 
     const infoMock = jest.spyOn(core, "info");
     const failedMock = jest.spyOn(core, "setFailed");
     const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(key);
+        });
 
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: key,
-        scope: "refs/heads/master",
-        archiveLocation: "www.actionscache.test/download"
-    };
-    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    getCacheMock.mockImplementation(() => {
-        return Promise.resolve(cacheEntry);
-    });
-    const tempPath = "/foo/bar";
+    await restoreRun();
 
-    const createTempDirectoryMock = jest.spyOn(
-        actionUtils,
-        "createTempDirectory"
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
     );
-    createTempDirectoryMock.mockImplementation(() => {
-        return Promise.resolve(tempPath);
-    });
-
-    const archivePath = path.join(tempPath, "cache.tgz");
-    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
-    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
-
-    const fileSize = 142;
-    const getArchiveFileSizeMock = jest
-        .spyOn(actionUtils, "getArchiveFileSize")
-        .mockReturnValue(fileSize);
-
-    const extractTarMock = jest.spyOn(tar, "extractTar");
-    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
-
-    await run();
 
     expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
-    expect(getCacheMock).toHaveBeenCalledWith([key]);
-    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
-    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
-    expect(downloadCacheMock).toHaveBeenCalledWith(
-        cacheEntry.archiveLocation,
-        archivePath
-    );
-    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
-
-    expect(extractTarMock).toHaveBeenCalledTimes(1);
-    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+    expect(stateMock).toHaveBeenCalledWith("CACHE_RESULT", key);
+    expect(stateMock).toHaveBeenCalledTimes(2);
 
     expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
-    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
-
-    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("restore with a pull request event and cache found", async () => {
-    const key = "node-test";
-    const cachePath = path.resolve("node_modules");
-    testUtils.setInputs({
-        path: "node_modules",
-        key
-    });
-
-    process.env[Events.Key] = Events.PullRequest;
-
-    const infoMock = jest.spyOn(core, "info");
-    const failedMock = jest.spyOn(core, "setFailed");
-    const stateMock = jest.spyOn(core, "saveState");
-
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: key,
-        scope: "refs/heads/master",
-        archiveLocation: "www.actionscache.test/download"
-    };
-    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    getCacheMock.mockImplementation(() => {
-        return Promise.resolve(cacheEntry);
-    });
-    const tempPath = "/foo/bar";
-
-    const createTempDirectoryMock = jest.spyOn(
-        actionUtils,
-        "createTempDirectory"
-    );
-    createTempDirectoryMock.mockImplementation(() => {
-        return Promise.resolve(tempPath);
-    });
-
-    const archivePath = path.join(tempPath, "cache.tgz");
-    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
-    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
-
-    const fileSize = 62915000;
-    const getArchiveFileSizeMock = jest
-        .spyOn(actionUtils, "getArchiveFileSize")
-        .mockReturnValue(fileSize);
-
-    const extractTarMock = jest.spyOn(tar, "extractTar");
-    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
-
-    await run();
-
-    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
-    expect(getCacheMock).toHaveBeenCalledWith([key]);
-    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
-    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
-    expect(downloadCacheMock).toHaveBeenCalledWith(
-        cacheEntry.archiveLocation,
-        archivePath
-    );
-    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
-    expect(infoMock).toHaveBeenCalledWith(`Cache Size: ~60 MB (62915000 B)`);
-
-    expect(extractTarMock).toHaveBeenCalledTimes(1);
-    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
-
-    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
-    expect(setCacheHitOutputMock).toHaveBeenCalledWith(true);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "true");
 
     expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
 
 test("restore with cache found for restore key", async () => {
+    const path = "node_modules";
     const key = "node-test";
     const restoreKey = "node-";
-    const cachePath = path.resolve("node_modules");
     testUtils.setInputs({
-        path: "node_modules",
+        path: path,
         key,
-        restoreKeys: [restoreKey]
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
     });
 
     const infoMock = jest.spyOn(core, "info");
     const failedMock = jest.spyOn(core, "setFailed");
     const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(restoreKey);
+        });
 
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: restoreKey,
-        scope: "refs/heads/master",
-        archiveLocation: "www.actionscache.test/download"
-    };
-    const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    getCacheMock.mockImplementation(() => {
-        return Promise.resolve(cacheEntry);
-    });
-    const tempPath = "/foo/bar";
+    await restoreRun();
 
-    const createTempDirectoryMock = jest.spyOn(
-        actionUtils,
-        "createTempDirectory"
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
     );
-    createTempDirectoryMock.mockImplementation(() => {
-        return Promise.resolve(tempPath);
-    });
-
-    const archivePath = path.join(tempPath, "cache.tgz");
-    const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
-    const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
-
-    const fileSize = 142;
-    const getArchiveFileSizeMock = jest
-        .spyOn(actionUtils, "getArchiveFileSize")
-        .mockReturnValue(fileSize);
-
-    const extractTarMock = jest.spyOn(tar, "extractTar");
-    const setCacheHitOutputMock = jest.spyOn(actionUtils, "setCacheHitOutput");
-
-    await run();
 
     expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
-    expect(getCacheMock).toHaveBeenCalledWith([key, restoreKey]);
-    expect(setCacheStateMock).toHaveBeenCalledWith(cacheEntry);
-    expect(createTempDirectoryMock).toHaveBeenCalledTimes(1);
-    expect(downloadCacheMock).toHaveBeenCalledWith(
-        cacheEntry.archiveLocation,
-        archivePath
-    );
-    expect(getArchiveFileSizeMock).toHaveBeenCalledWith(archivePath);
-    expect(infoMock).toHaveBeenCalledWith(`Cache Size: ~0 MB (142 B)`);
-
-    expect(extractTarMock).toHaveBeenCalledTimes(1);
-    expect(extractTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+    expect(stateMock).toHaveBeenCalledWith("CACHE_RESULT", restoreKey);
+    expect(stateMock).toHaveBeenCalledTimes(2);
 
     expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
-    expect(setCacheHitOutputMock).toHaveBeenCalledWith(false);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "false");
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache restored from key: ${restoreKey}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("Fail restore when fail on cache miss is enabled and primary + restore keys not found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        failOnCacheMiss: true
+    });
+
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+
+    expect(failedMock).toHaveBeenCalledWith(
+        `Failed to restore cache entry. Exiting as fail-on-cache-miss is set. Input key: ${key}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(1);
+});
+
+test("restore when fail on cache miss is enabled and primary key doesn't match restored key", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        failOnCacheMiss: true
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(restoreKey);
+        });
+
+    await restoreRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(stateMock).toHaveBeenCalledWith("CACHE_RESULT", restoreKey);
+    expect(stateMock).toHaveBeenCalledTimes(2);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "false");
 
     expect(infoMock).toHaveBeenCalledWith(
         `Cache restored from key: ${restoreKey}`
     );
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
+
+test("restore with fail on cache miss disabled and no cache found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        failOnCacheMiss: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(stateMock).toHaveBeenCalledTimes(1);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}, ${restoreKey}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/restoreImpl.test.ts

@@ -0,0 +1,467 @@
+import * as cache from "@actions/cache";
+import * as core from "@actions/core";
+
+import { Events, Inputs, RefKey } from "../src/constants";
+import { restoreImpl } from "../src/restoreImpl";
+import { StateProvider } from "../src/stateProvider";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("../src/utils/actionUtils");
+
+beforeAll(() => {
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isValidEvent").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.isValidEvent();
+    });
+
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.getInputAsBool(name, options);
+        }
+    );
+});
+
+beforeEach(() => {
+    jest.restoreAllMocks();
+    process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+    delete process.env[RefKey];
+});
+
+test("restore with invalid event outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const invalidEvent = "commit_comment";
+    process.env[Events.Key] = invalidEvent;
+    delete process.env[RefKey];
+    await restoreImpl(new StateProvider());
+    expect(logWarningMock).toHaveBeenCalledWith(
+        `Event Validation Error: The event type ${invalidEvent} is not supported because it's not tied to a branch or tag ref.`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore without AC available should no-op", async () => {
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => false
+    );
+
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(0);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "false");
+});
+
+test("restore on GHES without AC available should no-op", async () => {
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => true);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => false
+    );
+
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(0);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "false");
+});
+
+test("restore on GHES with AC available ", async () => {
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => true);
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(key);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "true");
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with no path should fail", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    await restoreImpl(new StateProvider());
+    expect(restoreCacheMock).toHaveBeenCalledTimes(0);
+    // this input isn't necessary for restore b/c tarball contains entries relative to workspace
+    expect(failedMock).not.toHaveBeenCalledWith(
+        "Input required and not supplied: path"
+    );
+});
+
+test("restore with no key", async () => {
+    testUtils.setInput(Inputs.Path, "node_modules");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    await restoreImpl(new StateProvider());
+    expect(restoreCacheMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledWith(
+        "Input required and not supplied: key"
+    );
+});
+
+test("restore with too many keys should fail", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKeys = [...Array(20).keys()].map(x => x.toString());
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys,
+        enableCrossOsArchive: false
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    await restoreImpl(new StateProvider());
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        restoreKeys,
+        {
+            lookupOnly: false
+        },
+        false
+    );
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: Keys are limited to a maximum of 10.`
+    );
+});
+
+test("restore with large key should fail", async () => {
+    const path = "node_modules";
+    const key = "foo".repeat(512); // Over the 512 character limit
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    await restoreImpl(new StateProvider());
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: ${key} cannot be larger than 512 characters.`
+    );
+});
+
+test("restore with invalid key should fail", async () => {
+    const path = "node_modules";
+    const key = "comma,comma";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    await restoreImpl(new StateProvider());
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+    expect(failedMock).toHaveBeenCalledWith(
+        `Key Validation Error: ${key} cannot contain commas.`
+    );
+});
+
+test("restore with no cache found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}`
+    );
+});
+
+test("restore with restore keys and no cache found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}, ${restoreKey}`
+    );
+});
+
+test("restore with cache found for key", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(key);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "true");
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with cache found for restore key", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(restoreKey);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "false");
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache restored from key: ${restoreKey}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with lookup-only set", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        lookupOnly: true
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const stateMock = jest.spyOn(core, "saveState");
+    const setCacheHitOutputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(key);
+        });
+
+    await restoreImpl(new StateProvider());
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: true
+        },
+        false
+    );
+
+    expect(stateMock).toHaveBeenCalledWith("CACHE_KEY", key);
+    expect(stateMock).toHaveBeenCalledWith("CACHE_RESULT", key);
+    expect(stateMock).toHaveBeenCalledTimes(2);
+
+    expect(setCacheHitOutputMock).toHaveBeenCalledTimes(1);
+    expect(setCacheHitOutputMock).toHaveBeenCalledWith("cache-hit", "true");
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache found and can be restored from key: ${key}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore failure with earlyExit should call process exit", async () => {
+    testUtils.setInput(Inputs.Path, "node_modules");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+    const processExitMock = jest.spyOn(process, "exit").mockImplementation();
+
+    // call restoreImpl with `earlyExit` set to true
+    await restoreImpl(new StateProvider(), true);
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(0);
+    expect(failedMock).toHaveBeenCalledWith(
+        "Input required and not supplied: key"
+    );
+    expect(processExitMock).toHaveBeenCalledWith(1);
+});

__tests__/restoreOnly.test.ts

@@ -0,0 +1,223 @@
+import * as cache from "@actions/cache";
+import * as core from "@actions/core";
+
+import { Events, RefKey } from "../src/constants";
+import { restoreOnlyRun } from "../src/restoreImpl";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("../src/utils/actionUtils");
+
+beforeAll(() => {
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isValidEvent").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.isValidEvent();
+    });
+
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            const actualUtils = jest.requireActual("../src/utils/actionUtils");
+            return actualUtils.getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsBool(name, options);
+        }
+    );
+});
+
+beforeEach(() => {
+    jest.restoreAllMocks();
+    process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+    delete process.env[RefKey];
+});
+
+test("restore with no cache found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const outputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreOnlyRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(outputMock).toHaveBeenCalledWith("cache-primary-key", key);
+    expect(outputMock).toHaveBeenCalledWith("cache-hit", "false");
+    expect(outputMock).toHaveBeenCalledTimes(2);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}`
+    );
+});
+
+test("restore with restore keys and no cache found", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const outputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(undefined);
+        });
+
+    await restoreOnlyRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(outputMock).toHaveBeenCalledWith("cache-primary-key", key);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache not found for input keys: ${key}, ${restoreKey}`
+    );
+});
+
+test("restore with cache found for key", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    testUtils.setInputs({
+        path: path,
+        key,
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const outputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(key);
+        });
+
+    await restoreOnlyRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(outputMock).toHaveBeenCalledWith("cache-primary-key", key);
+    expect(outputMock).toHaveBeenCalledWith("cache-hit", "true");
+    expect(outputMock).toHaveBeenCalledWith("cache-matched-key", key);
+
+    expect(outputMock).toHaveBeenCalledTimes(3);
+
+    expect(infoMock).toHaveBeenCalledWith(`Cache restored from key: ${key}`);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("restore with cache found for restore key", async () => {
+    const path = "node_modules";
+    const key = "node-test";
+    const restoreKey = "node-";
+    testUtils.setInputs({
+        path: path,
+        key,
+        restoreKeys: [restoreKey],
+        enableCrossOsArchive: false
+    });
+
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const outputMock = jest.spyOn(core, "setOutput");
+    const restoreCacheMock = jest
+        .spyOn(cache, "restoreCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(restoreKey);
+        });
+
+    await restoreOnlyRun();
+
+    expect(restoreCacheMock).toHaveBeenCalledTimes(1);
+    expect(restoreCacheMock).toHaveBeenCalledWith(
+        [path],
+        key,
+        [restoreKey],
+        {
+            lookupOnly: false
+        },
+        false
+    );
+
+    expect(outputMock).toHaveBeenCalledWith("cache-primary-key", key);
+    expect(outputMock).toHaveBeenCalledWith("cache-hit", "false");
+    expect(outputMock).toHaveBeenCalledWith("cache-matched-key", restoreKey);
+
+    expect(outputMock).toHaveBeenCalledTimes(3);
+
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache restored from key: ${restoreKey}`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/save.test.ts

@@ -1,16 +1,13 @@
+import * as cache from "@actions/cache";
 import * as core from "@actions/core";
-import * as path from "path";
-import * as cacheHttpClient from "../src/cacheHttpClient";
-import { Events, Inputs } from "../src/constants";
-import { ArtifactCacheEntry } from "../src/contracts";
-import run from "../src/save";
-import * as tar from "../src/tar";
+
+import { Events, Inputs, RefKey } from "../src/constants";
+import { saveRun } from "../src/saveImpl";
 import * as actionUtils from "../src/utils/actionUtils";
 import * as testUtils from "../src/utils/testUtils";
 
 jest.mock("@actions/core");
-jest.mock("../src/cacheHttpClient");
-jest.mock("../src/tar");
+jest.mock("@actions/cache");
 jest.mock("../src/utils/actionUtils");
 
 beforeAll(() => {
@@ -18,10 +15,34 @@ beforeAll(() => {
         return jest.requireActual("@actions/core").getInput(name, options);
     });
 
-    jest.spyOn(actionUtils, "getCacheState").mockImplementation(() => {
-        return jest.requireActual("../src/utils/actionUtils").getCacheState();
+    jest.spyOn(core, "getState").mockImplementation(name => {
+        return jest.requireActual("@actions/core").getState(name);
     });
 
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsInt").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsInt(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsBool(name, options);
+        }
+    );
+
     jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
         (key, cacheResult) => {
             return jest
@@ -34,345 +55,62 @@ beforeAll(() => {
         const actualUtils = jest.requireActual("../src/utils/actionUtils");
         return actualUtils.isValidEvent();
     });
-
-    jest.spyOn(actionUtils, "getSupportedEvents").mockImplementation(() => {
-        const actualUtils = jest.requireActual("../src/utils/actionUtils");
-        return actualUtils.getSupportedEvents();
-    });
-
-    jest.spyOn(actionUtils, "resolvePath").mockImplementation(filePath => {
-        return path.resolve(filePath);
-    });
-
-    jest.spyOn(actionUtils, "createTempDirectory").mockImplementation(() => {
-        return Promise.resolve("/foo/bar");
-    });
 });
 
 beforeEach(() => {
     process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
 });
 
 afterEach(() => {
     testUtils.clearInputs();
     delete process.env[Events.Key];
-});
-
-test("save with invalid event outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-    const invalidEvent = "commit_comment";
-    process.env[Events.Key] = invalidEvent;
-    await run();
-    expect(logWarningMock).toHaveBeenCalledWith(
-        `Event Validation Error: The event type ${invalidEvent} is not supported. Only push, pull_request events are supported at this time.`
-    );
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with no primary key in state outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return "";
-        });
-
-    await run();
-
-    expect(logWarningMock).toHaveBeenCalledWith(
-        `Error retrieving key from state.`
-    );
-    expect(logWarningMock).toHaveBeenCalledTimes(1);
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with exact match returns early", async () => {
-    const infoMock = jest.spyOn(core, "info");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: primaryKey,
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return primaryKey;
-        });
-
-    const createTarMock = jest.spyOn(tar, "createTar");
-
-    await run();
-
-    expect(infoMock).toHaveBeenCalledWith(
-        `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
-    );
-
-    expect(createTarMock).toHaveBeenCalledTimes(0);
-
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with missing input outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return primaryKey;
-        });
-
-    await run();
-
-    expect(logWarningMock).toHaveBeenCalledWith(
-        "Input required and not supplied: path"
-    );
-    expect(logWarningMock).toHaveBeenCalledTimes(1);
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with large cache outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return primaryKey;
-        });
-
-    const inputPath = "node_modules";
-    const cachePath = path.resolve(inputPath);
-    testUtils.setInput(Inputs.Path, inputPath);
-
-    const createTarMock = jest.spyOn(tar, "createTar");
-
-    const cacheSize = 6 * 1024 * 1024 * 1024; //~6GB, over the 5GB limit
-    jest.spyOn(actionUtils, "getArchiveFileSize").mockImplementationOnce(() => {
-        return cacheSize;
-    });
-
-    await run();
-
-    const archivePath = path.join("/foo/bar", "cache.tgz");
-
-    expect(createTarMock).toHaveBeenCalledTimes(1);
-    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
-
-    expect(logWarningMock).toHaveBeenCalledTimes(1);
-    expect(logWarningMock).toHaveBeenCalledWith(
-        "Cache size of ~6144 MB (6442450944 B) is over the 5GB limit, not saving cache."
-    );
-
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with reserve cache failure outputs warning", async () => {
-    const infoMock = jest.spyOn(core, "info");
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return primaryKey;
-        });
-
-    const inputPath = "node_modules";
-    testUtils.setInput(Inputs.Path, inputPath);
-
-    const reserveCacheMock = jest
-        .spyOn(cacheHttpClient, "reserveCache")
-        .mockImplementationOnce(() => {
-            return Promise.resolve(-1);
-        });
-
-    const createTarMock = jest.spyOn(tar, "createTar");
-
-    const saveCacheMock = jest.spyOn(cacheHttpClient, "saveCache");
-
-    await run();
-
-    expect(reserveCacheMock).toHaveBeenCalledTimes(1);
-    expect(reserveCacheMock).toHaveBeenCalledWith(primaryKey);
-
-    expect(infoMock).toHaveBeenCalledWith(
-        `Unable to reserve cache with key ${primaryKey}, another job may be creating this cache.`
-    );
-
-    expect(createTarMock).toHaveBeenCalledTimes(0);
-    expect(saveCacheMock).toHaveBeenCalledTimes(0);
-    expect(logWarningMock).toHaveBeenCalledTimes(0);
-    expect(failedMock).toHaveBeenCalledTimes(0);
-});
-
-test("save with server error outputs warning", async () => {
-    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
-    const failedMock = jest.spyOn(core, "setFailed");
-
-    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
-
-    jest.spyOn(core, "getState")
-        // Cache Entry State
-        .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
-        })
-        // Cache Key State
-        .mockImplementationOnce(() => {
-            return primaryKey;
-        });
-
-    const inputPath = "node_modules";
-    const cachePath = path.resolve(inputPath);
-    testUtils.setInput(Inputs.Path, inputPath);
-
-    const cacheId = 4;
-    const reserveCacheMock = jest
-        .spyOn(cacheHttpClient, "reserveCache")
-        .mockImplementationOnce(() => {
-            return Promise.resolve(cacheId);
-        });
-
-    const createTarMock = jest.spyOn(tar, "createTar");
-
-    const saveCacheMock = jest
-        .spyOn(cacheHttpClient, "saveCache")
-        .mockImplementationOnce(() => {
-            throw new Error("HTTP Error Occurred");
-        });
-
-    await run();
-
-    expect(reserveCacheMock).toHaveBeenCalledTimes(1);
-    expect(reserveCacheMock).toHaveBeenCalledWith(primaryKey);
-
-    const archivePath = path.join("/foo/bar", "cache.tgz");
-
-    expect(createTarMock).toHaveBeenCalledTimes(1);
-    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
-
-    expect(saveCacheMock).toHaveBeenCalledTimes(1);
-    expect(saveCacheMock).toHaveBeenCalledWith(cacheId, archivePath);
-
-    expect(logWarningMock).toHaveBeenCalledTimes(1);
-    expect(logWarningMock).toHaveBeenCalledWith("HTTP Error Occurred");
-
-    expect(failedMock).toHaveBeenCalledTimes(0);
+    delete process.env[RefKey];
 });
 
 test("save with valid inputs uploads a cache", async () => {
     const failedMock = jest.spyOn(core, "setFailed");
 
     const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
-    const cacheEntry: ArtifactCacheEntry = {
-        cacheKey: "Linux-node-",
-        scope: "refs/heads/master",
-        creationTime: "2019-11-13T19:18:02+00:00",
-        archiveLocation: "www.actionscache.test/download"
-    };
+    const savedCacheKey = "Linux-node-";
 
     jest.spyOn(core, "getState")
         // Cache Entry State
         .mockImplementationOnce(() => {
-            return JSON.stringify(cacheEntry);
+            return primaryKey;
         })
         // Cache Key State
         .mockImplementationOnce(() => {
-            return primaryKey;
+            return savedCacheKey;
         });
 
     const inputPath = "node_modules";
-    const cachePath = path.resolve(inputPath);
     testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
 
     const cacheId = 4;
-    const reserveCacheMock = jest
-        .spyOn(cacheHttpClient, "reserveCache")
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
         .mockImplementationOnce(() => {
             return Promise.resolve(cacheId);
         });
 
-    const createTarMock = jest.spyOn(tar, "createTar");
-
-    const saveCacheMock = jest.spyOn(cacheHttpClient, "saveCache");
-
-    await run();
-
-    expect(reserveCacheMock).toHaveBeenCalledTimes(1);
-    expect(reserveCacheMock).toHaveBeenCalledWith(primaryKey);
-
-    const archivePath = path.join("/foo/bar", "cache.tgz");
-
-    expect(createTarMock).toHaveBeenCalledTimes(1);
-    expect(createTarMock).toHaveBeenCalledWith(archivePath, cachePath);
+    await saveRun();
 
     expect(saveCacheMock).toHaveBeenCalledTimes(1);
-    expect(saveCacheMock).toHaveBeenCalledWith(cacheId, archivePath);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
 
     expect(failedMock).toHaveBeenCalledTimes(0);
 });

__tests__/saveImpl.test.ts

@@ -0,0 +1,408 @@
+import * as cache from "@actions/cache";
+import * as core from "@actions/core";
+
+import { Events, Inputs, RefKey } from "../src/constants";
+import { saveImpl } from "../src/saveImpl";
+import { StateProvider } from "../src/stateProvider";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("@actions/core");
+jest.mock("@actions/cache");
+jest.mock("../src/utils/actionUtils");
+
+beforeAll(() => {
+    jest.spyOn(core, "getInput").mockImplementation((name, options) => {
+        return jest.requireActual("@actions/core").getInput(name, options);
+    });
+
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsInt").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsInt(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsBool(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isValidEvent").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.isValidEvent();
+    });
+});
+
+beforeEach(() => {
+    jest.restoreAllMocks();
+    process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+    delete process.env[RefKey];
+});
+
+test("save with invalid event outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+    const invalidEvent = "commit_comment";
+    process.env[Events.Key] = invalidEvent;
+    delete process.env[RefKey];
+    await saveImpl(new StateProvider());
+    expect(logWarningMock).toHaveBeenCalledWith(
+        `Event Validation Error: The event type ${invalidEvent} is not supported because it's not tied to a branch or tag ref.`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with no primary key in state outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const savedCacheKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return "";
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        });
+    const saveCacheMock = jest.spyOn(cache, "saveCache");
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(0);
+    expect(logWarningMock).toHaveBeenCalledWith(`Key is not specified.`);
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save without AC available should no-op", async () => {
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => false
+    );
+
+    const saveCacheMock = jest.spyOn(cache, "saveCache");
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(0);
+});
+
+test("save on ghes without AC available should no-op", async () => {
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => true);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => false
+    );
+
+    const saveCacheMock = jest.spyOn(cache, "saveCache");
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(0);
+});
+
+test("save on GHES with AC available", async () => {
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => true);
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with exact match returns early", async () => {
+    const infoMock = jest.spyOn(core, "info");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = primaryKey;
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+    const saveCacheMock = jest.spyOn(cache, "saveCache");
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(0);
+    expect(infoMock).toHaveBeenCalledWith(
+        `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with missing input outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+    const saveCacheMock = jest.spyOn(cache, "saveCache");
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(0);
+    expect(logWarningMock).toHaveBeenCalledWith(
+        "Input required and not supplied: path"
+    );
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with large cache outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            throw new Error(
+                "Cache size of ~6144 MB (6442450944 B) is over the 5GB limit, not saving cache."
+            );
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        expect.anything(),
+        false
+    );
+
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(logWarningMock).toHaveBeenCalledWith(
+        "Cache size of ~6144 MB (6442450944 B) is over the 5GB limit, not saving cache."
+    );
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with reserve cache failure outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            const actualCache = jest.requireActual("@actions/cache");
+            const error = new actualCache.ReserveCacheError(
+                `Unable to reserve cache with key ${primaryKey}, another job may be creating this cache.`
+            );
+            throw error;
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        expect.anything(),
+        false
+    );
+
+    expect(logWarningMock).toHaveBeenCalledWith(
+        `Unable to reserve cache with key ${primaryKey}, another job may be creating this cache.`
+    );
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with server error outputs warning", async () => {
+    const logWarningMock = jest.spyOn(actionUtils, "logWarning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            throw new Error("HTTP Error Occurred");
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        expect.anything(),
+        false
+    );
+
+    expect(logWarningMock).toHaveBeenCalledTimes(1);
+    expect(logWarningMock).toHaveBeenCalledWith("HTTP Error Occurred");
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save with valid inputs uploads a cache", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/saveOnly.test.ts

@@ -0,0 +1,139 @@
+import * as cache from "@actions/cache";
+import * as core from "@actions/core";
+
+import { Events, Inputs, RefKey } from "../src/constants";
+import { saveOnlyRun } from "../src/saveImpl";
+import * as actionUtils from "../src/utils/actionUtils";
+import * as testUtils from "../src/utils/testUtils";
+
+jest.mock("@actions/core");
+jest.mock("@actions/cache");
+jest.mock("../src/utils/actionUtils");
+
+beforeAll(() => {
+    jest.spyOn(core, "getInput").mockImplementation((name, options) => {
+        return jest.requireActual("@actions/core").getInput(name, options);
+    });
+
+    jest.spyOn(core, "setOutput").mockImplementation((key, value) => {
+        return jest.requireActual("@actions/core").getInput(key, value);
+    });
+
+    jest.spyOn(actionUtils, "getInputAsArray").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsArray(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsInt").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsInt(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "getInputAsBool").mockImplementation(
+        (name, options) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .getInputAsBool(name, options);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isExactKeyMatch").mockImplementation(
+        (key, cacheResult) => {
+            return jest
+                .requireActual("../src/utils/actionUtils")
+                .isExactKeyMatch(key, cacheResult);
+        }
+    );
+
+    jest.spyOn(actionUtils, "isValidEvent").mockImplementation(() => {
+        const actualUtils = jest.requireActual("../src/utils/actionUtils");
+        return actualUtils.isValidEvent();
+    });
+});
+
+beforeEach(() => {
+    process.env[Events.Key] = Events.Push;
+    process.env[RefKey] = "refs/heads/feature-branch";
+
+    jest.spyOn(actionUtils, "isGhes").mockImplementation(() => false);
+    jest.spyOn(actionUtils, "isCacheFeatureAvailable").mockImplementation(
+        () => true
+    );
+});
+
+afterEach(() => {
+    testUtils.clearInputs();
+    delete process.env[Events.Key];
+    delete process.env[RefKey];
+});
+
+test("save with valid inputs uploads a cache", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Key, primaryKey);
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveOnlyRun();
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
+test("save failing logs the warning message", async () => {
+    const warningMock = jest.spyOn(core, "warning");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Key, primaryKey);
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+
+    const cacheId = -1;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveOnlyRun();
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(warningMock).toHaveBeenCalledTimes(1);
+    expect(warningMock).toHaveBeenCalledWith("Cache save failed.");
+});

__tests__/stateProvider.test.ts

@@ -0,0 +1,89 @@
+import * as core from "@actions/core";
+
+import { Events, RefKey, State } from "../src/constants";
+import {
+    IStateProvider,
+    NullStateProvider,
+    StateProvider
+} from "../src/stateProvider";
+
+jest.mock("@actions/core");
+
+beforeAll(() => {
+    jest.spyOn(core, "getInput").mockImplementation((name, options) => {
+        return jest.requireActual("@actions/core").getInput(name, options);
+    });
+
+    jest.spyOn(core, "setOutput").mockImplementation((key, value) => {
+        return jest.requireActual("@actions/core").setOutput(key, value);
+    });
+});
+
+afterEach(() => {
+    delete process.env[Events.Key];
+    delete process.env[RefKey];
+});
+
+test("StateProvider saves states", async () => {
+    const states = new Map<string, string>();
+    const getStateMock = jest
+        .spyOn(core, "getState")
+        .mockImplementation(key => states.get(key) || "");
+
+    const saveStateMock = jest
+        .spyOn(core, "saveState")
+        .mockImplementation((key, value) => {
+            states.set(key, value);
+        });
+
+    const setOutputMock = jest
+        .spyOn(core, "setOutput")
+        .mockImplementation((key, value) => {
+            return jest.requireActual("@actions/core").setOutput(key, value);
+        });
+
+    const cacheMatchedKey = "node-cache";
+
+    const stateProvider: IStateProvider = new StateProvider();
+    stateProvider.setState("stateKey", "stateValue");
+    stateProvider.setState(State.CacheMatchedKey, cacheMatchedKey);
+    const stateValue = stateProvider.getState("stateKey");
+    const cacheStateValue = stateProvider.getCacheState();
+
+    expect(stateValue).toBe("stateValue");
+    expect(cacheStateValue).toBe(cacheMatchedKey);
+    expect(getStateMock).toHaveBeenCalledTimes(2);
+    expect(saveStateMock).toHaveBeenCalledTimes(2);
+    expect(setOutputMock).toHaveBeenCalledTimes(0);
+});
+
+test("NullStateProvider saves outputs", async () => {
+    const getStateMock = jest
+        .spyOn(core, "getState")
+        .mockImplementation(name =>
+            jest.requireActual("@actions/core").getState(name)
+        );
+
+    const setOutputMock = jest
+        .spyOn(core, "setOutput")
+        .mockImplementation((key, value) => {
+            return jest.requireActual("@actions/core").setOutput(key, value);
+        });
+
+    const saveStateMock = jest
+        .spyOn(core, "saveState")
+        .mockImplementation((key, value) => {
+            return jest.requireActual("@actions/core").saveState(key, value);
+        });
+
+    const cacheMatchedKey = "node-cache";
+    const nullStateProvider: IStateProvider = new NullStateProvider();
+    nullStateProvider.setState(State.CacheMatchedKey, "outputValue");
+    nullStateProvider.setState(State.CachePrimaryKey, cacheMatchedKey);
+    nullStateProvider.getState("outputKey");
+    nullStateProvider.getCacheState();
+
+    expect(getStateMock).toHaveBeenCalledTimes(0);
+    expect(setOutputMock).toHaveBeenCalledTimes(2);
+    expect(saveStateMock).toHaveBeenCalledTimes(0);
+});

__tests__/tar.test.ts

@@ -1,58 +0,0 @@
-import * as exec from "@actions/exec";
-import * as io from "@actions/io";
-import * as tar from "../src/tar";
-
-jest.mock("@actions/exec");
-jest.mock("@actions/io");
-
-beforeAll(() => {
-    jest.spyOn(io, "which").mockImplementation(tool => {
-        return Promise.resolve(tool);
-    });
-});
-
-test("extract tar", async () => {
-    const mkdirMock = jest.spyOn(io, "mkdirP");
-    const execMock = jest.spyOn(exec, "exec");
-
-    const archivePath = "cache.tar";
-    const targetDirectory = "~/.npm/cache";
-    await tar.extractTar(archivePath, targetDirectory);
-
-    expect(mkdirMock).toHaveBeenCalledWith(targetDirectory);
-
-    const IS_WINDOWS = process.platform === "win32";
-    const tarPath = IS_WINDOWS
-        ? `${process.env["windir"]}\\System32\\tar.exe`
-        : "tar";
-    expect(execMock).toHaveBeenCalledTimes(1);
-    expect(execMock).toHaveBeenCalledWith(`"${tarPath}"`, [
-        "-xz",
-        "-f",
-        archivePath,
-        "-C",
-        targetDirectory
-    ]);
-});
-
-test("create tar", async () => {
-    const execMock = jest.spyOn(exec, "exec");
-
-    const archivePath = "cache.tar";
-    const sourceDirectory = "~/.npm/cache";
-    await tar.createTar(archivePath, sourceDirectory);
-
-    const IS_WINDOWS = process.platform === "win32";
-    const tarPath = IS_WINDOWS
-        ? `${process.env["windir"]}\\System32\\tar.exe`
-        : "tar";
-    expect(execMock).toHaveBeenCalledTimes(1);
-    expect(execMock).toHaveBeenCalledWith(`"${tarPath}"`, [
-        "-cz",
-        "-f",
-        archivePath,
-        "-C",
-        sourceDirectory,
-        "."
-    ]);
-});

__tests__/verify-cache-files.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# Validate args
+prefix="$1"
+if [ -z "$prefix" ]; then
+  echo "Must supply prefix argument"
+  exit 1
+fi
+
+path="$2"
+if [ -z "$path" ]; then
+  echo "Must specify path argument"
+  exit 1
+fi
+
+# Sanity check GITHUB_RUN_ID defined
+if [ -z "$GITHUB_RUN_ID" ]; then
+  echo "GITHUB_RUN_ID not defined"
+  exit 1
+fi
+
+# Verify file exists
+file="$path/test-file.txt"
+echo "Checking for $file"
+if [ ! -e $file ]; then
+  echo "File does not exist"
+  exit 1
+fi
+
+# Verify file content
+content="$(cat $file)"
+echo "File content:\n$content"
+if [ -z "$(echo $content | grep --fixed-strings "$prefix $GITHUB_RUN_ID")" ]; then
+  echo "Unexpected file content"
+  exit 1
+fi

action.yml

@@ -3,22 +3,41 @@ description: 'Cache artifacts like dependencies and build outputs to improve wor
 author: 'GitHub'
 inputs:
   path:
-    description: 'A directory to store and save the cache'
+    description: 'A list of files, directories, and wildcard patterns to cache and restore'
     required: true
   key:
     description: 'An explicit key for restoring and saving the cache'
     required: true
   restore-keys:
-    description: 'An ordered list of keys to use for restoring the cache if no cache hit occurred for key'
+    description: 'An ordered multiline string listing the prefix-matched keys, that are used for restoring stale cache if no cache hit occurred for key. Note `cache-hit` returns false in this case.'
     required: false
+  upload-chunk-size:
+    description: 'The chunk size used to split up large files during upload, in bytes'
+    required: false
+  enableCrossOsArchive:
+    description: 'An optional boolean when enabled, allows windows runners to save or restore caches that can be restored or saved respectively on other platforms'
+    default: 'false'
+    required: false
+  fail-on-cache-miss:
+    description: 'Fail the workflow if cache entry is not found'
+    default: 'false'
+    required: false
+  lookup-only:
+    description: 'Check if a cache entry exists for the given input(s) (key, restore-keys) without downloading the cache'
+    default: 'false'
+    required: false
+  save-always:
+    description: 'Run the post step to save the cache even if another step before fails'
+    default: 'false'
+    required: false    
 outputs:
   cache-hit:
     description: 'A boolean value to indicate an exact match was found for the primary key'
 runs:
-  using: 'node12'
+  using: 'node20'
   main: 'dist/restore/index.js'
   post: 'dist/save/index.js'
-  post-if: 'success()'
+  post-if: "success() || github.event.inputs.save-always"
 branding:
   icon: 'archive'
   color: 'gray-dark'

caching-strategies.md

@@ -0,0 +1,306 @@
+# Caching Strategies
+
+This document lists some of the strategies (and example workflows if possible) which can be used to ...
+
+- use an effective cache key and/or path
+- solve some common use cases around saving and restoring caches
+- leverage the step inputs and outputs more effectively
+
+## Choosing the right key
+
+```yaml
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    - uses: actions/cache@v3
+      with:
+        key: ${{ some-metadata }}-cache
+```
+
+In your workflows, you can use different strategies to name your key depending on your use case so that the cache is scoped appropriately for your need. For example, you can have cache specific to OS, or based on the lockfile or commit SHA or even workflow run.
+
+### Updating cache for any change in the dependencies
+
+One of the most common use case is to use hash for lockfile as key. This way, same cache will be restored for a lockfile until there's a change in dependencies listed in lockfile.
+
+```yaml
+  - uses: actions/cache@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: cache-${{ hashFiles('**/lockfiles') }}
+```
+
+### Using restore keys to download the closest matching cache
+
+If cache is not found matching the primary key, restore keys can be used to download the closest matching cache that was recently created. This ensures that the build/install step will need to additionally fetch just a handful of newer dependencies, and hence saving build time.
+
+```yaml
+  - uses: actions/cache@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: cache-npm-${{ hashFiles('**/lockfiles') }}
+      restore-keys: |
+        cache-npm-
+```
+
+The restore keys can be provided as a complete name, or a prefix, read more [here](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#matching-a-cache-key) on how a cache key is matched using restore keys.
+
+### Separate caches by Operating System
+
+In case of workflows with matrix running for multiple Operating Systems, the caches can be stored separately for each of them. This can be used in combination with hashfiles in case multiple caches are being generated per OS.
+
+```yaml
+  - uses: actions/cache@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: ${{ runner.os }}-cache
+```
+
+### Creating a short lived cache
+
+Caches scoped to the particular workflow run id or run attempt can be stored and referred by using the run id/attempt. This is an effective way to have a short lived cache.
+
+```yaml
+    key: cache-${{ github.run_id }}-${{ github.run_attempt }}
+```
+
+On similar lines, commit sha can be used to create a very specialized and short lived cache.
+
+```yaml
+  - uses: actions/cache@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: cache-${{ github.sha }}
+```
+
+### Using multiple factors while forming a key depening on the need
+
+Cache key can be formed by combination of more than one metadata, evaluated info.
+
+```yaml
+  - uses: actions/cache@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+The [GitHub Context](https://docs.github.com/en/actions/learn-github-actions/contexts#github-context) can be used to create keys using the workflows metadata.
+
+## Restoring Cache
+
+### Understanding how to choose path
+
+While setting paths for caching dependencies it is important to give correct path depending on the hosted runner you are using or whether the action is running in a container job. Assigning different `path` for save and restore will result in cache miss.
+
+Below are GiHub hosted runner specific paths one should take care of when writing a workflow which saves/restores caches across OS.
+
+#### Ubuntu Paths
+
+Home directory (`~/`) = `/home/runner`
+
+`${{ github.workspace }}` = `/home/runner/work/repo/repo`
+
+`process.env['RUNNER_TEMP']`=`/home/runner/work/_temp`
+
+`process.cwd()` = `/home/runner/work/repo/repo`
+
+#### Windows Paths
+
+Home directory (`~/`) = `C:\Users\runneradmin`
+
+`${{ github.workspace }}` = `D:\a\repo\repo`
+
+`process.env['RUNNER_TEMP']` = `D:\a\_temp`
+
+`process.cwd()` = `D:\a\repo\repo`
+
+#### macOS Paths
+
+Home directory (`~/`) = `/Users/runner`
+
+`${{ github.workspace }}` = `/Users/runner/work/repo/repo`
+
+`process.env['RUNNER_TEMP']` = `/Users/runner/work/_temp`
+
+`process.cwd()` = `/Users/runner/work/repo/repo`
+
+Where:
+
+`cwd()` = Current working directory where the repository code resides.
+
+`RUNNER_TEMP` = Environment variable defined for temporary storage location.
+
+### Make cache read only / Reuse cache from centralized job
+
+In case you are using a centralized job to create and save your cache that can be reused by other jobs in your repository, this action will take care of your restore only needs and make the cache read-only.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+  - name: Install Dependencies
+    if: steps.cache.outputs.cache-hit != 'true'
+    run: /install.sh
+
+  - name: Build
+    run: /build.sh
+
+  - name: Publish package to public
+    run: /publish.sh
+```
+
+### Failing/Exiting the workflow if cache with exact key is not found
+
+You can use the output of this action to exit the workflow on cache miss. This way you can restrict your workflow to only initiate the build when `cache-hit` occurs, in other words, cache with exact key is found.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+  - name: Check cache hit
+    if: steps.cache.outputs.cache-hit != 'true'
+    run: exit 1
+
+  - name: Build
+    run: /build.sh
+```
+
+## Saving cache
+
+### Reusing primary key from restore cache as input to save action
+
+If you want to avoid re-computing the cache key again in `save` action, the outputs from `restore` action can be used as input to the `save` action.
+
+```yaml
+  - uses: actions/cache/restore@v3
+    id: restore-cache
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+  .
+  .
+  .
+  - uses: actions/cache/save@v3
+    with:
+      path: |
+        path/to/dependencies
+        some/other/dependencies
+      key: ${{ steps.restore-cache.outputs.cache-primary-key }}
+```
+
+### Re-evaluate cache key while saving cache
+
+On the other hand, the key can also be explicitly re-computed while executing the save action. This helps in cases where the lockfiles are generated during the build.
+
+Let's say we have a restore step that computes key at runtime
+
+```yaml
+uses: actions/cache/restore@v3
+id: restore-cache
+with:
+    key: cache-${{ hashFiles('**/lockfiles') }}
+```
+
+Case 1: Where an user would want to reuse the key as it is
+
+```yaml
+uses: actions/cache/save@v3
+with:
+    key: ${{ steps.restore-cache.outputs.cache-primary-key }}
+```
+
+Case 2: Where the user would want to re-evaluate the key
+
+```yaml
+uses: actions/cache/save@v3
+with:
+    key: npm-cache-${{hashfiles(package-lock.json)}}
+```
+
+### Saving cache even if the build fails
+
+There can be cases where a cache should be saved even if the build job fails. For example, a job can fail due to flaky tests but the caches can still be re-used. You can use `actions/cache/save` action to save the cache by using `if: always()` condition.
+
+Similarly, `actions/cache/save` action can be conditionally used based on the output of the previous steps. This way you get more control on when to save the cache.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+  .
+  . // restore if need be
+  .
+  - name: Build
+    run: /build.sh
+  - uses: actions/cache/save@v3
+    if: always() // or any other condition to invoke the save action
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+### Saving cache once and reusing in multiple workflows
+
+In case of multi-module projects, where the built artifact of one project needs to be reused in subsequent child modules, the need of rebuilding the parent module again and again with every build can be eliminated. The `actions/cache` or `actions/cache/save` action can be used to build and save the parent module artifact once, and restored multiple times while building the child modules.
+
+#### Step 1 - Build the parent module and save it
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - name: Build
+    run: ./build-parent-module.sh
+
+  - uses: actions/cache/save@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+#### Step 2 - Restore the built artifact from cache using the same key and path
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+  - name: Install Dependencies
+    if: steps.cache.outputs.cache-hit != 'true'
+    run: ./install.sh
+      
+  - name: Build
+    run: ./build-child-module.sh
+
+  - name: Publish package to public
+    run: ./publish.sh
+```

examples.md

@@ -1,15 +1,36 @@
 # Examples
 
 - [C# - NuGet](#c---nuget)
+- [Clojure - Lein Deps](#clojure---lein-deps)
+- [D - DUB](#d---dub)
+  - [POSIX](#posix)
+  - [Windows](#windows)
+- [Deno](#deno)
+  - [Linux](#linux)
+  - [macOS](#macos)
+  - [Windows](#windows-1)
 - [Elixir - Mix](#elixir---mix)
+- [Erlang - Rebar3](#erlang--rebar3)
 - [Go - Modules](#go---modules)
+  - [Linux](#linux-1)
+  - [macOS](#macos-1)
+  - [Windows](#windows-2)
 - [Haskell - Cabal](#haskell---cabal)
+- [Haskell - Stack](#haskell---stack)
 - [Java - Gradle](#java---gradle)
 - [Java - Maven](#java---maven)
 - [Node - npm](#node---npm)
+- [Node - Lerna](#node---lerna)
 - [Node - Yarn](#node---yarn)
+- [Node - Yarn 2](#node---yarn-2)
+- [OCaml/Reason - esy](#ocamlreason---esy)
 - [PHP - Composer](#php---composer)
 - [Python - pip](#python---pip)
+  - [Simple example](#simple-example)
+  - [Multiple OS's in a workflow](#multiple-oss-in-a-workflow)
+  - [Multiple OS's in a workflow with a matrix](#multiple-oss-in-a-workflow-with-a-matrix)
+  - [Using pip to get cache location](#using-pip-to-get-cache-location)
+- [Python - pipenv](#python---pipenv)
 - [R - renv](#r---renv)
 - [Ruby - Bundler](#ruby---bundler)
 - [Rust - Cargo](#rust---cargo)
@@ -17,12 +38,15 @@
 - [Swift, Objective-C - Carthage](#swift-objective-c---carthage)
 - [Swift, Objective-C - CocoaPods](#swift-objective-c---cocoapods)
 - [Swift - Swift Package Manager](#swift---swift-package-manager)
+- [Swift - Mint](#swift---mint)
+- [* - Bazel](#---bazel)
 
 ## C# - NuGet
+
 Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/package-references-in-project-files#locking-dependencies):
 
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
     path: ~/.nuget/packages
     key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
@@ -31,13 +55,27 @@ Using [NuGet lock files](https://docs.microsoft.com/nuget/consume-packages/packa
 ```
 
 Depending on the environment, huge packages might be pre-installed in the global cache folder.
-If you do not want to include them, consider to move the cache folder like below.
->Note: This workflow does not work for projects that require files to be placed in user profile package folder
+With `actions/cache@v3` you can now exclude unwanted packages with [exclude pattern](https://github.com/actions/toolkit/tree/main/packages/glob#exclude-patterns)
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~/.nuget/packages
+      !~/.nuget/packages/unwanted
+    key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
+    restore-keys: |
+      ${{ runner.os }}-nuget-
+```
+
+Or you could move the cache folder like below.
+> **Note** This workflow does not work for projects that require files to be placed in user profile package folder
+
 ```yaml
 env:
   NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
 steps:
-  - uses: actions/cache@v1
+  - uses: actions/cache@v3
     with:
       path: ${{ github.workspace }}/.nuget/packages
       key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
@@ -45,22 +83,139 @@ steps:
         ${{ runner.os }}-nuget-
 ```
 
-## Elixir - Mix
+## Clojure - Lein Deps
+
 ```yaml
-- uses: actions/cache@v1
+- name: Cache lein project dependencies
+  uses: actions/cache@v3
   with:
-    path: deps
-    key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+    path: ~/.m2/repository
+    key: ${{ runner.os }}-clojure-${{ hashFiles('**/project.clj') }}
+    restore-keys: |
+      ${{ runner.os }}-clojure
+```
+
+
+## D - DUB
+
+### POSIX
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: ~/.dub
+    key: ${{ runner.os }}-dub-${{ hashFiles('**/dub.selections.json') }}
+    restore-keys: |
+      ${{ runner.os }}-dub-
+```
+
+### Windows
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: ~\AppData\Local\dub
+    key: ${{ runner.os }}-dub-${{ hashFiles('**/dub.selections.json') }}
+    restore-keys: |
+      ${{ runner.os }}-dub-
+```
+
+## Deno
+
+### Linux
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~/.deno
+      ~/.cache/deno
+    key: ${{ runner.os }}-deno-${{ hashFiles('**/deps.ts') }}
+```
+
+### macOS
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~/.deno
+      ~/Library/Caches/deno
+    key: ${{ runner.os }}-deno-${{ hashFiles('**/deps.ts') }}
+```
+
+### Windows
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~\.deno
+      ~\AppData\Local\deno
+    key: ${{ runner.os }}-deno-${{ hashFiles('**/deps.ts') }}
+```
+
+## Elixir - Mix
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      deps
+      _build
+    key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
     restore-keys: |
       ${{ runner.os }}-mix-
 ```
 
+## Erlang - Rebar3
+```yaml
+- uses: actions/cache@v2
+  with:
+    path: |
+      ~/.cache/rebar3
+      _build
+    key: ${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-${{ hashFiles('**/*rebar.lock') }}
+    restore-keys: |
+      ${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-
+```
+
 ## Go - Modules
 
+### Linux
+
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
-    path: ~/go/pkg/mod
+    path: |
+      ~/.cache/go-build
+      ~/go/pkg/mod
+    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+    restore-keys: |
+      ${{ runner.os }}-go-
+```
+
+### macOS
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~/Library/Caches/go-build
+      ~/go/pkg/mod
+    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+    restore-keys: |
+      ${{ runner.os }}-go-
+```
+
+### Windows
+
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: |
+      ~\AppData\Local\go-build
+      ~\go\pkg\mod
     key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
     restore-keys: |
       ${{ runner.os }}-go-
@@ -71,30 +226,70 @@ steps:
 We cache the elements of the Cabal store separately, as the entirety of `~/.cabal` can grow very large for projects with many dependencies.
 
 ```yaml
-- uses: actions/cache@v1
-  name: Cache ~/.cabal/packages
+- name: Cache ~/.cabal/packages, ~/.cabal/store and dist-newstyle
+  uses: actions/cache@v3
   with:
-    path: ~/.cabal/packages
-    key: ${{ runner.os }}-${{ matrix.ghc }}-cabal-packages
-- uses: actions/cache@v1
-  name: Cache ~/.cabal/store
+    path: |
+      ~/.cabal/packages
+      ~/.cabal/store
+      dist-newstyle
+    key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('**/*.cabal', '**/cabal.project', '**/cabal.project.freeze') }}
+    restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+```
+
+## Haskell - Stack
+
+### Linux or macOS
+
+```yaml
+- uses: actions/cache@v3
+  name: Cache ~/.stack
   with:
-    path: ~/.cabal/store
-    key: ${{ runner.os }}-${{ matrix.ghc }}-cabal-store
-- uses: actions/cache@v1
-  name: Cache dist-newstyle
+    path: ~/.stack
+    key: ${{ runner.os }}-stack-global-${{ hashFiles('stack.yaml') }}-${{ hashFiles('package.yaml') }}
+    restore-keys: |
+      ${{ runner.os }}-stack-global-
+- uses: actions/cache@v3
+  name: Cache .stack-work
   with:
-    path: dist-newstyle
-    key: ${{ runner.os }}-${{ matrix.ghc }}-dist-newstyle
+    path: .stack-work
+    key: ${{ runner.os }}-stack-work-${{ hashFiles('stack.yaml') }}-${{ hashFiles('package.yaml') }}-${{ hashFiles('**/*.hs') }}
+    restore-keys: |
+      ${{ runner.os }}-stack-work-
+```
+
+### Windows
+
+```yaml
+- uses: actions/cache@v3
+  name: Cache %APPDATA%\stack %LOCALAPPDATA%\Programs\stack
+  with:
+    path: |
+      ~\AppData\Roaming\stack
+      ~\AppData\Local\Programs\stack    
+    key: ${{ runner.os }}-stack-global-${{ hashFiles('stack.yaml') }}-${{ hashFiles('package.yaml') }}
+    restore-keys: |
+      ${{ runner.os }}-stack-global-
+- uses: actions/cache@v3
+  name: Cache .stack-work
+  with:
+    path: .stack-work
+    key: ${{ runner.os }}-stack-work-${{ hashFiles('stack.yaml') }}-${{ hashFiles('package.yaml') }}-${{ hashFiles('**/*.hs') }}
+    restore-keys: |
+      ${{ runner.os }}-stack-work-
 ```
 
 ## Java - Gradle
 
+> **Note** Ensure no Gradle daemons are running anymore when your workflow completes. Creating the cache package might fail due to locks being held by Gradle. Refer to the [Gradle Daemon documentation](https://docs.gradle.org/current/userguide/gradle_daemon.html) on how to disable or stop the Gradle Daemons.
+
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
-    path: ~/.gradle/caches
-    key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+    path: |
+      ~/.gradle/caches
+      ~/.gradle/wrapper
+    key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
     restore-keys: |
       ${{ runner.os }}-gradle-
 ```
@@ -102,7 +297,8 @@ We cache the elements of the Cabal store separately, as the entirety of `~/.caba
 ## Java - Maven
 
 ```yaml
-- uses: actions/cache@v1
+- name: Cache local Maven repository
+  uses: actions/cache@v3
   with:
     path: ~/.m2/repository
     key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
@@ -112,71 +308,122 @@ We cache the elements of the Cabal store separately, as the entirety of `~/.caba
 
 ## Node - npm
 
-For npm, cache files are stored in `~/.npm` on Posix, or `%AppData%/npm-cache` on Windows. See https://docs.npmjs.com/cli/cache#cache
+For npm, cache files are stored in `~/.npm` on Posix, or `~\AppData\npm-cache` on Windows, but it's possible to use `npm config get cache` to find the path on any platform. See [the npm docs](https://docs.npmjs.com/cli/cache#cache) for more details.
 
->Note: It is not recommended to cache `node_modules`, as it can break across Node versions and won't work with `npm ci`
+If using `npm config` to retrieve the cache directory, ensure you run [actions/setup-node](https://github.com/actions/setup-node) first to ensure your `npm` version is correct.
+After [deprecation](https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/) of save-state and set-output commands, the correct way to set output is using `${GITHUB_OUTPUT}`. For linux, we can use `${GITHUB_OUTPUT}` whereas for windows we need to use `${env:GITHUB_OUTPUT}` due to two different default shells in these two different OS ie `bash` and `pwsh` respectively.
 
-### macOS and Ubuntu
+> **Note** It is not recommended to cache `node_modules`, as it can break across Node versions and won't work with `npm ci`
 
+### **Get npm cache directory using same shell**
+### Bash shell
 ```yaml
-- uses: actions/cache@v1
-  with:
-    path: ~/.npm
-    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-    restore-keys: |
-      ${{ runner.os }}-node-
-```
-
-### Windows
-
-```yaml
-- uses: actions/cache@v1
-  with:
-    path: ~\AppData\Roaming\npm-cache
-    key: ${{ runner.os }}-node-${{ hashFiles('**\package-lock.json') }}
-    restore-keys: |
-      ${{ runner.os }}-node-
-```
-
-### Using multiple systems and `npm config`
-
-```yaml  
 - name: Get npm cache directory
-  id: npm-cache
-  run: |
-    echo "::set-output name=dir::$(npm config get cache)"
-- uses: actions/cache@v1
+  id: npm-cache-dir
+  shell: bash
+  run: echo "dir=$(npm config get cache)" >> ${GITHUB_OUTPUT}
+```
+
+### PWSH shell
+```yaml
+- name: Get npm cache directory
+  id: npm-cache-dir
+  shell: pwsh
+  run: echo "dir=$(npm config get cache)" >> ${env:GITHUB_OUTPUT}
+```
+`Get npm cache directory` step can then be used with `actions/cache` as shown below
+
+```yaml
+- uses: actions/cache@v3
+  id: npm-cache # use this to check for `cache-hit` ==> if: steps.npm-cache.outputs.cache-hit != 'true'
   with:
-    path: ${{ steps.npm-cache.outputs.dir }}
+    path: ${{ steps.npm-cache-dir.outputs.dir }}
     key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
     restore-keys: |
       ${{ runner.os }}-node-
 ```
 
+## Node - Lerna
+
+```yaml
+- name: restore lerna
+  uses: actions/cache@v3
+  with:
+    path: '**/node_modules'
+    key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+```
+
 ## Node - Yarn
 The yarn cache directory will depend on your operating system and version of `yarn`. See https://yarnpkg.com/lang/en/docs/cli/cache/ for more info.
 
 ```yaml
-- name: Get yarn cache
-  id: yarn-cache
-  run: echo "::set-output name=dir::$(yarn cache dir)"
+- name: Get yarn cache directory path
+  id: yarn-cache-dir-path
+  run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
 
-- uses: actions/cache@v1
+- uses: actions/cache@v3
+  id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
   with:
-    path: ${{ steps.yarn-cache.outputs.dir }}
+    path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
     key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
     restore-keys: |
       ${{ runner.os }}-yarn-
 ```
 
+## Node - Yarn 2
+
+The yarn 2 cache directory will depend on your config. See https://yarnpkg.com/configuration/yarnrc#cacheFolder for more info.
+
+```yaml
+- name: Get yarn cache directory path
+  id: yarn-cache-dir-path
+  run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
+
+- uses: actions/cache@v3
+  id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+  with:
+    path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+    key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+    restore-keys: |
+      ${{ runner.os }}-yarn-
+```
+
+## OCaml/Reason - esy
+
+Esy allows you to export built dependencies and import pre-built dependencies.
+```yaml
+    - name: Restore Cache
+      id: restore-cache
+      uses: actions/cache@v3
+      with:
+        path: _export
+        key:  ${{ runner.os }}-esy-${{ hashFiles('esy.lock/index.json') }}
+        restore-keys: |
+          ${{ runner.os }}-esy-
+    - name: Esy install
+      run: 'esy install'
+    - name: Import Cache
+      run: |
+        esy import-dependencies _export
+        rm -rf _export
+
+    ...(Build job)...
+
+    # Re-export dependencies if anything has changed or if it is the first time
+    - name: Setting dependency cache
+      run: |
+        esy export-dependencies
+      if: steps.restore-cache.outputs.cache-hit != 'true'
+```
+
 ## PHP - Composer
 
-```yaml  
+```yaml
 - name: Get Composer Cache Directory
   id: composer-cache
   run: |
-    echo "::set-output name=dir::$(composer config cache-files-dir)"
-- uses: actions/cache@v1
+    echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+- uses: actions/cache@v3
   with:
     path: ${{ steps.composer-cache.outputs.dir }}
     key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
@@ -189,13 +436,15 @@ The yarn cache directory will depend on your operating system and version of `ya
 For pip, the cache directory will vary by OS. See https://pip.pypa.io/en/stable/reference/pip_install/#caching
 
 Locations:
- - Ubuntu: `~/.cache/pip`
- - Windows: `~\AppData\Local\pip\Cache`
- - macOS: `~/Library/Caches/pip`
+
+- Ubuntu: `~/.cache/pip`
+- Windows: `~\AppData\Local\pip\Cache`
+- macOS: `~/Library/Caches/pip`
 
 ### Simple example
+
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
     path: ~/.cache/pip
     key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
@@ -208,7 +457,7 @@ Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
 ### Multiple OS's in a workflow
 
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   if: startsWith(runner.os, 'Linux')
   with:
     path: ~/.cache/pip
@@ -216,7 +465,7 @@ Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
     restore-keys: |
       ${{ runner.os }}-pip-
 
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   if: startsWith(runner.os, 'macOS')
   with:
     path: ~/Library/Caches/pip
@@ -224,7 +473,7 @@ Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
     restore-keys: |
       ${{ runner.os }}-pip-
 
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   if: startsWith(runner.os, 'Windows')
   with:
     path: ~\AppData\Local\pip\Cache
@@ -233,16 +482,43 @@ Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
       ${{ runner.os }}-pip-
 ```
 
-### Using a script to get cache location
+### Multiple OS's in a workflow with a matrix
 
-> Note: This uses an internal pip API and may not always work
+``` yaml
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        include:
+        - os: ubuntu-latest
+          path: ~/.cache/pip
+        - os: macos-latest
+          path: ~/Library/Caches/pip
+        - os: windows-latest
+          path: ~\AppData\Local\pip\Cache
+    steps:
+    - uses: actions/cache@v3
+      with:
+        path: ${{ matrix.path }}
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+         ${{ runner.os }}-pip-
+```
+
+### Using pip to get cache location
+
+> **Note** This requires pip 20.1+
 ```yaml
-- name: Get pip cache
-   id: pip-cache
-   run: |
-     python -c "from pip._internal.locations import USER_CACHE_DIR; print('::set-output name=dir::' + USER_CACHE_DIR)"
+- name: Get pip cache dir
+  id: pip-cache
+  shell: bash
+  run: |
+    echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
 
-- uses: actions/cache@v1
+- name: pip cache
+  uses: actions/cache@v3
   with:
     path: ${{ steps.pip-cache.outputs.dir }}
     key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
@@ -250,113 +526,96 @@ Replace `~/.cache/pip` with the correct `path` if not using Ubuntu.
       ${{ runner.os }}-pip-
 ```
 
-## R - renv
+## Python - pipenv
 
-For renv, the cache directory will vary by OS. Look at https://rstudio.github.io/renv/articles/renv.html#cache
-
-Locations:
- - Ubuntu: `~/.local/share/renv`
- - macOS: `~/Library/Application Support/renv`
- - Windows: `%LOCALAPPDATA%/renv`
-
-### Simple example
 ```yaml
-- uses: actions/cache@v1
+- name: Set up Python
+  # The actions/cache step below uses this id to get the exact python version
+  id: setup-python
+  uses: actions/setup-python@v2
+
+  ⋮
+
+- uses: actions/cache@v3
   with:
-    path: ~/.local/share/renv
-    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
-    restore-keys: |
-      ${{ runner.os }}-renv-
+    path: ~/.local/share/virtualenvs
+    key: ${{ runner.os }}-python-${{ steps.setup-python.outputs.python-version }}-pipenv-${{ hashFiles('Pipfile.lock') }}
 ```
 
-Replace `~/.local/share/renv` with the correct `path` if not using Ubuntu.
+## R - renv
 
-### Multiple OS's in a workflow
+For renv, the cache directory will vary by OS. The `RENV_PATHS_ROOT` environment variable is used to set the cache location. Have a look at https://rstudio.github.io/renv/reference/paths.html#details for more details.
 
 ```yaml
-- uses: actions/cache@v1
-  if: startsWith(runner.os, 'Linux')
+- name: Set RENV_PATHS_ROOT
+  shell: bash
+  run: |
+    echo "RENV_PATHS_ROOT=${{ runner.temp }}/renv" >> $GITHUB_ENV
+- name: Install and activate renv
+  run: |
+    install.packages("renv")
+    renv::activate()
+  shell: Rscript {0}
+- name: Get R and OS version
+  id: get-version
+  run: |
+    cat("##[set-output name=os-version;]", sessionInfo()$running, "\n", sep = "")
+    cat("##[set-output name=r-version;]", R.Version()$version.string, sep = "")
+  shell: Rscript {0}
+- name: Restore Renv package cache
+  uses: actions/cache@v3
   with:
-    path: ~/.local/share/renv
-    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
-    restore-keys: |
-      ${{ runner.os }}-renv-
-
-- uses: actions/cache@v1
-  if: startsWith(runner.os, 'macOS')
-  with:
-    path: ~/Library/Application Support/renv
-    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
-    restore-keys: |
-      ${{ runner.os }}-renv-
-
-- uses: actions/cache@v1
-  if: startsWith(runner.os, 'Windows')
-  with:
-    path: ~\AppData\Local\renv
-    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
-    restore-keys: |
-      ${{ runner.os }}-renv-
+    path: ${{ env.RENV_PATHS_ROOT }}
+    key: ${{ steps.get-version.outputs.os-version }}-${{ steps.get-version.outputs.r-version }}-${{ inputs.cache-version }}-${{ hashFiles('renv.lock') }}
+    restore-keys: ${{ steps.get-version.outputs.os-version }}-${{ steps.get-version.outputs.r-version }}-${{inputs.cache-version }}-
 ```
 
 ## Ruby - Bundler
 
-```yaml
-- uses: actions/cache@v1
-  with:
-    path: vendor/bundle
-    key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-    restore-keys: |
-      ${{ runner.os }}-gems-
-```
-When dependencies are installed later in the workflow, we must specify the same path for the bundler.
+Caching gems with Bundler correctly is not trivial and just using `actions/cache`
+is [not enough](https://github.com/ruby/setup-ruby#caching-bundle-install-manually).
+
+Instead, it is recommended to use `ruby/setup-ruby`'s
+[`bundler-cache: true` option](https://github.com/ruby/setup-ruby#caching-bundle-install-automatically)
+whenever possible:
 
 ```yaml
-- name: Bundle install
-  run: |
-    bundle config path vendor/bundle
-    bundle install --jobs 4 --retry 3
+- uses: ruby/setup-ruby@v1
+  with:
+    ruby-version: ...
+    bundler-cache: true
 ```
 
 ## Rust - Cargo
 
 ```yaml
-- name: Cache cargo registry
-  uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
-    path: ~/.cargo/registry
-    key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-- name: Cache cargo index
-  uses: actions/cache@v1
-  with:
-    path: ~/.cargo/git
-    key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
-- name: Cache cargo build
-  uses: actions/cache@v1
-  with:
-    path: target
-    key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+    path: |
+      ~/.cargo/bin/
+      ~/.cargo/registry/index/
+      ~/.cargo/registry/cache/
+      ~/.cargo/git/db/
+      target/
+    key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 ```
 
 ## Scala - SBT
 
 ```yaml
-- name: Cache SBT ivy cache
-  uses: actions/cache@v1
-  with:
-    path: ~/.ivy2/cache
-    key: ${{ runner.os }}-sbt-ivy-cache-${{ hashFiles('**/build.sbt') }}
 - name: Cache SBT
-  uses: actions/cache@v1
+  uses: actions/cache@v3
   with:
-    path: ~/.sbt
+    path: |
+      ~/.ivy2/cache
+      ~/.sbt
     key: ${{ runner.os }}-sbt-${{ hashFiles('**/build.sbt') }}
 ```
 
 ## Swift, Objective-C - Carthage
 
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
     path: Carthage
     key: ${{ runner.os }}-carthage-${{ hashFiles('**/Cartfile.resolved') }}
@@ -367,7 +626,7 @@ When dependencies are installed later in the workflow, we must specify the same
 ## Swift, Objective-C - CocoaPods
 
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
     path: Pods
     key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
@@ -378,10 +637,57 @@ When dependencies are installed later in the workflow, we must specify the same
 ## Swift - Swift Package Manager
 
 ```yaml
-- uses: actions/cache@v1
+- uses: actions/cache@v3
   with:
     path: .build
     key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
     restore-keys: |
       ${{ runner.os }}-spm-
 ```
+
+## Swift - Mint
+
+```yaml
+env:
+  MINT_PATH: .mint/lib
+  MINT_LINK_PATH: .mint/bin
+steps:
+  - uses: actions/cache@v3
+    with:
+      path: .mint
+      key: ${{ runner.os }}-mint-${{ hashFiles('**/Mintfile') }}
+      restore-keys: |
+        ${{ runner.os }}-mint-
+```
+
+## * - Bazel
+
+[`bazelisk`](https://github.com/bazelbuild/bazelisk) does not have be to separately downloaded and installed because it's already included in GitHub's `ubuntu-latest` and `macos-latest` base images.
+
+### Linux
+
+```yaml
+- name: Cache Bazel
+  uses: actions/cache@v3
+  with:
+    path: |
+      ~/.cache/bazel
+    key: ${{ runner.os }}-bazel-${{ hashFiles('.bazelversion', '.bazelrc', 'WORKSPACE', 'WORKSPACE.bazel', 'MODULE.bazel') }}
+    restore-keys: |
+      ${{ runner.os }}-bazel-
+- run: bazelisk test //...
+```
+
+### macOS
+
+```yaml
+- name: Cache Bazel
+  uses: actions/cache@v3
+  with:
+    path: |
+      /private/var/tmp/_bazel_runner/
+    key: ${{ runner.os }}-bazel-${{ hashFiles('.bazelversion', '.bazelrc', 'WORKSPACE', 'WORKSPACE.bazel', 'MODULE.bazel') }}
+    restore-keys: |
+      ${{ runner.os }}-bazel-
+- run: bazelisk test //...
+```

jest.config.js

@@ -17,7 +17,7 @@ const processStdoutWrite = process.stdout.write.bind(process.stdout);
 process.stdout.write = (str, encoding, cb) => {
     // Core library will directly call process.stdout.write for commands
     // We don't want :: commands to be executed by the runner during tests
-    if (!str.match(/^::/)) {
+    if (!String(str).match(/^::/)) {
         return processStdoutWrite(str, encoding, cb);
     }
 };

package.json

@@ -1,16 +1,15 @@
 {
   "name": "cache",
-  "version": "1.1.2",
+  "version": "4.0.2",
   "private": true,
   "description": "Cache dependencies and build outputs",
   "main": "dist/restore/index.js",
   "scripts": {
-    "build": "tsc",
+    "build": "tsc && ncc build -o dist/restore src/restore.ts && ncc build -o dist/save src/save.ts && ncc build -o dist/restore-only src/restoreOnly.ts && ncc build -o dist/save-only src/saveOnly.ts",
     "test": "tsc --noEmit && jest --coverage",
     "lint": "eslint **/*.ts --cache",
     "format": "prettier --write **/*.ts",
-    "format-check": "prettier --check **/*.ts",
-    "release": "ncc build -o dist/restore src/restore.ts && ncc build -o dist/save src/save.ts && git add -f dist/"
+    "format-check": "prettier --check **/*.ts"
   },
   "repository": {
     "type": "git",
@@ -24,30 +23,29 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.2.0",
-    "@actions/exec": "^1.0.1",
-    "@actions/http-client": "^1.0.6",
-    "@actions/io": "^1.0.1",
-    "uuid": "^3.3.3"
+    "@actions/cache": "^3.2.3",
+    "@actions/core": "^1.10.0",
+    "@actions/exec": "^1.1.1",
+    "@actions/io": "^1.1.2"
   },
   "devDependencies": {
-    "@types/jest": "^24.0.13",
+    "@types/jest": "^27.5.2",
     "@types/nock": "^11.1.0",
-    "@types/node": "^12.0.4",
-    "@types/uuid": "^3.4.5",
-    "@typescript-eslint/eslint-plugin": "^2.7.0",
-    "@typescript-eslint/parser": "^2.7.0",
-    "@zeit/ncc": "^0.20.5",
-    "eslint": "^6.6.0",
-    "eslint-config-prettier": "^6.5.0",
-    "eslint-plugin-import": "^2.18.2",
-    "eslint-plugin-jest": "^23.0.3",
-    "eslint-plugin-prettier": "^3.1.1",
-    "jest": "^24.8.0",
-    "jest-circus": "^24.7.1",
-    "nock": "^11.7.0",
-    "prettier": "^1.19.1",
-    "ts-jest": "^24.0.2",
-    "typescript": "^3.7.3"
+    "@types/node": "^16.18.3",
+    "@typescript-eslint/eslint-plugin": "^5.45.0",
+    "@typescript-eslint/parser": "^5.45.0",
+    "@vercel/ncc": "^0.38.1",
+    "eslint": "^8.28.0",
+    "eslint-config-prettier": "^8.5.0",
+    "eslint-plugin-import": "^2.26.0",
+    "eslint-plugin-jest": "^26.9.0",
+    "eslint-plugin-prettier": "^4.2.1",
+    "eslint-plugin-simple-import-sort": "^7.0.0",
+    "jest": "^28.1.3",
+    "jest-circus": "^27.5.1",
+    "nock": "^13.2.9",
+    "prettier": "^2.8.0",
+    "ts-jest": "^28.0.8",
+    "typescript": "^4.9.3"
   }
 }

restore/README.md

@@ -0,0 +1,135 @@
+# Restore action
+
+The restore action restores a cache. It works similarly to the `cache` action except that it doesn't have a post step to save the cache. This action provides granular ability to restore a cache without having to save it. It accepts the same set of inputs as the `cache` action.
+
+## Documentation
+
+### Inputs
+
+* `key` - An explicit key for a cache entry. See [creating a cache key](../README.md#creating-a-cache-key).
+* `path` - A list of files, directories, and wildcard patterns to restore. See [`@actions/glob`](https://github.com/actions/toolkit/tree/main/packages/glob) for supported patterns.
+* `restore-keys` - An ordered list of prefix-matched keys to use for restoring stale cache if no cache hit occurred for key.
+* `fail-on-cache-miss` - Fail the workflow if cache entry is not found. Default: `false`
+* `lookup-only` - If true, only checks if cache entry exists and skips download. Default: `false`
+
+### Outputs
+
+* `cache-hit` - A boolean value to indicate an exact match was found for the key.
+* `cache-primary-key` - Cache primary key passed in the input to use in subsequent steps of the workflow.
+* `cache-matched-key` - Key of the cache that was restored, it could either be the primary key on cache-hit or a partial/complete match of one of the restore keys.
+
+> **Note**
+`cache-hit` will be set to `true` only when cache hit occurs for the exact `key` match. For a partial key match via `restore-keys` or a cache miss, it will be set to `false`.
+
+### Environment Variables
+
+* `SEGMENT_DOWNLOAD_TIMEOUT_MINS` - Segment download timeout (in minutes, default `10`) to abort download of the segment if not completed in the defined number of minutes. [Read more](https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout)
+
+## Use cases
+
+As this is a newly introduced action to give users more control in their workflows, below are some use cases where one can use this action.
+
+### Only restore cache
+
+If you are using separate jobs to create and save your cache(s) to be reused by other jobs in a repository, this action will take care of your cache restoring needs.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+  - name: Install Dependencies
+    if: steps.cache.outputs.cache-hit != 'true'
+    run: /install.sh
+
+  - name: Build
+    run: /build.sh
+
+  - name: Publish package to public
+    run: /publish.sh
+```
+
+Once the cache is restored, unlike `actions/cache`, this action won't run a post step to do post-processing, and the rest of the workflow will run as usual.
+
+### Save intermediate private build artifacts
+
+In case of multi-module projects, where the built artifact of one project needs to be reused in subsequent child modules, the need to rebuild the parent module again and again with every build can be eliminated. The `actions/cache` or `actions/cache/save` action can be used to build and save the parent module artifact once, and it can be restored multiple times while building the child modules.
+
+#### Step 1 - Build the parent module and save it
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - name: Build
+    run: /build-parent-module.sh
+
+  - uses: actions/cache/save@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+#### Step 2 - Restore the built artifact from cache using the same key and path
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+  - name: Install Dependencies
+    if: steps.cache.outputs.cache-hit != 'true'
+    run: /install.sh
+
+  - name: Build
+    run: /build-child-module.sh
+
+  - name: Publish package to public
+    run: /publish.sh
+```
+
+### Exit workflow on cache miss
+
+You can use `fail-on-cache-miss: true` to exit a workflow on a cache miss. This way you can restrict your workflow to only build when there is a `cache-hit`.
+
+To fail if there is no cache hit for the primary key, leave `restore-keys` empty!
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - uses: actions/cache/restore@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+      fail-on-cache-miss: true
+
+  - name: Build
+    run: /build.sh
+```
+
+## Tips
+
+### Reusing primary key and restored key in the save action
+
+Usually you may want to use the same `key` with both `actions/cache/restore` and `actions/cache/save` actions. To achieve this, use `outputs` from the `restore` action to reuse the same primary key (or the key of the cache that was restored).
+
+### Using restore action outputs to make save action behave just like the cache action
+
+The outputs `cache-primary-key` and `cache-matched-key` can be used to check if the restored cache is same as the given primary key. Alternatively, the `cache-hit` output can also be used to check if the restored was a complete match or a partially restored cache.
+
+### Ensuring proper restores and save happen across the actions
+
+It is very important to use the same `key` and `path` that were used by either `actions/cache` or `actions/cache/save` while saving the cache. Learn more about cache key [naming](https://github.com/actions/cache#creating-a-cache-key) and [versioning](https://github.com/actions/cache#cache-version) here.

restore/action.yml

@@ -0,0 +1,38 @@
+name: 'Restore Cache'
+description: 'Restore Cache artifacts like dependencies and build outputs to improve workflow execution time'
+author: 'GitHub'
+inputs:
+  path:
+    description: 'A list of files, directories, and wildcard patterns to restore'
+    required: true
+  key:
+    description: 'An explicit key for restoring the cache'
+    required: true
+  restore-keys:
+    description: 'An ordered multiline string listing the prefix-matched keys, that are used for restoring stale cache if no cache hit occurred for key. Note `cache-hit` returns false in this case.'
+    required: false
+  enableCrossOsArchive:
+    description: 'An optional boolean when enabled, allows windows runners to restore caches that were saved on other platforms'
+    default: 'false'
+    required: false
+  fail-on-cache-miss:
+    description: 'Fail the workflow if cache entry is not found'
+    default: 'false'
+    required: false
+  lookup-only:
+    description: 'Check if a cache entry exists for the given input(s) (key, restore-keys) without downloading the cache'
+    default: 'false'
+    required: false
+outputs:
+  cache-hit:
+    description: 'A boolean value to indicate an exact match was found for the primary key'
+  cache-primary-key:
+    description: 'A resolved cache key for which cache match was attempted'
+  cache-matched-key:
+    description: 'Key of the cache that was restored, it could either be the primary key on cache-hit or a partial/complete match of one of the restore keys'
+runs:
+  using: 'node20'
+  main: '../dist/restore-only/index.js'
+branding:
+  icon: 'archive'
+  color: 'gray-dark'

save/README.md

@@ -0,0 +1,88 @@
+# Save action
+
+The save action saves a cache. It works similarly to the `cache` action except that it doesn't first do a restore. This action provides granular ability to save a cache without having to restore it, or to do a save at any stage of the workflow job -- not only in post phase.
+
+## Documentation
+
+### Inputs
+
+* `key` - An explicit key for a cache entry. See [creating a cache key](../README.md#creating-a-cache-key).
+* `path` - A list of files, directories, and wildcard patterns to cache. See [`@actions/glob`](https://github.com/actions/toolkit/tree/main/packages/glob) for supported patterns.
+* `upload-chunk-size` - The chunk size used to split up large files during upload, in bytes
+
+### Outputs
+
+This action has no outputs.
+
+## Use cases
+
+
+### Only save cache
+
+If you are using separate jobs for generating common artifacts and sharing them across jobs, this action will take care of your cache saving needs.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+
+  - name: Install Dependencies
+    run: /install.sh
+
+  - name: Build artifacts
+    run: /build.sh
+
+  - uses: actions/cache/save@v3
+    id: cache
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```
+
+### Re-evaluate cache key while saving
+
+With this save action, the key can now be re-evaluated while executing the action. This helps in cases where lockfiles are generated during the build.
+
+Let's say we have a restore step that computes a key at runtime.
+
+#### Restore a cache
+
+```yaml
+uses: actions/cache/restore@v3
+id: restore-cache
+with:
+    key: cache-${{ hashFiles('**/lockfiles') }}
+```
+
+#### Case 1 - Where a user would want to reuse the key as it is
+```yaml
+uses: actions/cache/save@v3
+with:
+    key: ${{ steps.restore-cache.outputs.cache-primary-key }}
+```
+
+#### Case 2 - Where the user would want to re-evaluate the key
+
+```yaml
+uses: actions/cache/save@v3
+with:
+    key: npm-cache-${{hashfiles(package-lock.json)}}
+```
+
+### Always save cache
+
+There are instances where some flaky test cases would fail the entire workflow and users would get frustrated because the builds would run for hours and the cache couldn't be saved as the workflow failed in between. For such use-cases, users now have the ability to use the `actions/cache/save` action to save the cache by using an `if: always()` condition. This way the cache will always be saved if generated, or a warning will be generated that nothing is found on the cache path. Users can also use the `if` condition to only execute the `actions/cache/save` action depending on the output of previous steps. This way they get more control of when to save the cache.
+
+```yaml
+steps:
+  - uses: actions/checkout@v3
+  .
+  . // restore if need be
+  .
+  - name: Build
+    run: /build.sh
+  - uses: actions/cache/save@v3
+    if: always() // or any other condition to invoke the save action
+    with:
+      path: path/to/dependencies
+      key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+```

save/action.yml

@@ -0,0 +1,23 @@
+name: 'Save a cache'
+description: 'Save Cache artifacts like dependencies and build outputs to improve workflow execution time'
+author: 'GitHub'
+inputs:
+  path:
+    description: 'A list of files, directories, and wildcard patterns to cache'
+    required: true
+  key:
+    description: 'An explicit key for saving the cache'
+    required: true
+  upload-chunk-size:
+    description: 'The chunk size used to split up large files during upload, in bytes'
+    required: false
+  enableCrossOsArchive:
+    description: 'An optional boolean when enabled, allows windows runners to save caches that can be restored on other platforms'
+    default: 'false'
+    required: false
+runs:
+  using: 'node20'
+  main: '../dist/save-only/index.js'
+branding:
+  icon: 'archive'
+  color: 'gray-dark'

src/cacheHttpClient.ts

@@ -1,298 +0,0 @@
-import * as core from "@actions/core";
-import * as fs from "fs";
-import { BearerCredentialHandler } from "@actions/http-client/auth";
-import { HttpClient, HttpCodes } from "@actions/http-client";
-import {
-    IHttpClientResponse,
-    IRequestOptions,
-    ITypedResponse
-} from "@actions/http-client/interfaces";
-import {
-    ArtifactCacheEntry,
-    CommitCacheRequest,
-    ReserveCacheRequest,
-    ReserveCacheResponse
-} from "./contracts";
-import * as utils from "./utils/actionUtils";
-
-function isSuccessStatusCode(statusCode?: number): boolean {
-    if (!statusCode) {
-        return false;
-    }
-    return statusCode >= 200 && statusCode < 300;
-}
-
-function isRetryableStatusCode(statusCode?: number): boolean {
-    if (!statusCode) {
-        return false;
-    }
-    const retryableStatusCodes = [
-        HttpCodes.BadGateway,
-        HttpCodes.ServiceUnavailable,
-        HttpCodes.GatewayTimeout
-    ];
-    return retryableStatusCodes.includes(statusCode);
-}
-
-function getCacheApiUrl(resource: string): string {
-    // Ideally we just use ACTIONS_CACHE_URL
-    const baseUrl: string = (
-        process.env["ACTIONS_CACHE_URL"] ||
-        process.env["ACTIONS_RUNTIME_URL"] ||
-        ""
-    ).replace("pipelines", "artifactcache");
-    if (!baseUrl) {
-        throw new Error(
-            "Cache Service Url not found, unable to restore cache."
-        );
-    }
-
-    const url = `${baseUrl}_apis/artifactcache/${resource}`;
-    core.debug(`Resource Url: ${url}`);
-    return url;
-}
-
-function createAcceptHeader(type: string, apiVersion: string): string {
-    return `${type};api-version=${apiVersion}`;
-}
-
-function getRequestOptions(): IRequestOptions {
-    const requestOptions: IRequestOptions = {
-        headers: {
-            Accept: createAcceptHeader("application/json", "6.0-preview.1")
-        }
-    };
-
-    return requestOptions;
-}
-
-function createHttpClient(): HttpClient {
-    const token = process.env["ACTIONS_RUNTIME_TOKEN"] || "";
-    const bearerCredentialHandler = new BearerCredentialHandler(token);
-
-    return new HttpClient(
-        "actions/cache",
-        [bearerCredentialHandler],
-        getRequestOptions()
-    );
-}
-
-export async function getCacheEntry(
-    keys: string[]
-): Promise<ArtifactCacheEntry | null> {
-    const httpClient = createHttpClient();
-    const resource = `cache?keys=${encodeURIComponent(keys.join(","))}`;
-
-    const response = await httpClient.getJson<ArtifactCacheEntry>(
-        getCacheApiUrl(resource)
-    );
-    if (response.statusCode === 204) {
-        return null;
-    }
-    if (!isSuccessStatusCode(response.statusCode)) {
-        throw new Error(`Cache service responded with ${response.statusCode}`);
-    }
-
-    const cacheResult = response.result;
-    const cacheDownloadUrl = cacheResult?.archiveLocation;
-    if (!cacheDownloadUrl) {
-        throw new Error("Cache not found.");
-    }
-    core.setSecret(cacheDownloadUrl);
-    core.debug(`Cache Result:`);
-    core.debug(JSON.stringify(cacheResult));
-
-    return cacheResult;
-}
-
-async function pipeResponseToStream(
-    response: IHttpClientResponse,
-    stream: NodeJS.WritableStream
-): Promise<void> {
-    return new Promise(resolve => {
-        response.message.pipe(stream).on("close", () => {
-            resolve();
-        });
-    });
-}
-
-export async function downloadCache(
-    archiveLocation: string,
-    archivePath: string
-): Promise<void> {
-    const stream = fs.createWriteStream(archivePath);
-    const httpClient = new HttpClient("actions/cache");
-    const downloadResponse = await httpClient.get(archiveLocation);
-    await pipeResponseToStream(downloadResponse, stream);
-}
-
-// Reserve Cache
-export async function reserveCache(key: string): Promise<number> {
-    const httpClient = createHttpClient();
-
-    const reserveCacheRequest: ReserveCacheRequest = {
-        key
-    };
-    const response = await httpClient.postJson<ReserveCacheResponse>(
-        getCacheApiUrl("caches"),
-        reserveCacheRequest
-    );
-    return response?.result?.cacheId ?? -1;
-}
-
-function getContentRange(start: number, end: number): string {
-    // Format: `bytes start-end/filesize
-    // start and end are inclusive
-    // filesize can be *
-    // For a 200 byte chunk starting at byte 0:
-    // Content-Range: bytes 0-199/*
-    return `bytes ${start}-${end}/*`;
-}
-
-async function uploadChunk(
-    httpClient: HttpClient,
-    resourceUrl: string,
-    data: NodeJS.ReadableStream,
-    start: number,
-    end: number
-): Promise<void> {
-    core.debug(
-        `Uploading chunk of size ${end -
-            start +
-            1} bytes at offset ${start} with content range: ${getContentRange(
-            start,
-            end
-        )}`
-    );
-    const additionalHeaders = {
-        "Content-Type": "application/octet-stream",
-        "Content-Range": getContentRange(start, end)
-    };
-
-    const uploadChunkRequest = async (): Promise<IHttpClientResponse> => {
-        return await httpClient.sendStream(
-            "PATCH",
-            resourceUrl,
-            data,
-            additionalHeaders
-        );
-    };
-
-    const response = await uploadChunkRequest();
-    if (isSuccessStatusCode(response.message.statusCode)) {
-        return;
-    }
-
-    if (isRetryableStatusCode(response.message.statusCode)) {
-        core.debug(
-            `Received ${response.message.statusCode}, retrying chunk at offset ${start}.`
-        );
-        const retryResponse = await uploadChunkRequest();
-        if (isSuccessStatusCode(retryResponse.message.statusCode)) {
-            return;
-        }
-    }
-
-    throw new Error(
-        `Cache service responded with ${response.message.statusCode} during chunk upload.`
-    );
-}
-
-function parseEnvNumber(key: string): number | undefined {
-    const value = Number(process.env[key]);
-    if (Number.isNaN(value) || value < 0) {
-        return undefined;
-    }
-    return value;
-}
-
-async function uploadFile(
-    httpClient: HttpClient,
-    cacheId: number,
-    archivePath: string
-): Promise<void> {
-    // Upload Chunks
-    const fileSize = fs.statSync(archivePath).size;
-    const resourceUrl = getCacheApiUrl(`caches/${cacheId.toString()}`);
-    const fd = fs.openSync(archivePath, "r");
-
-    const concurrency = parseEnvNumber("CACHE_UPLOAD_CONCURRENCY") ?? 4; // # of HTTP requests in parallel
-    const MAX_CHUNK_SIZE =
-        parseEnvNumber("CACHE_UPLOAD_CHUNK_SIZE") ?? 32 * 1024 * 1024; // 32 MB Chunks
-    core.debug(`Concurrency: ${concurrency} and Chunk Size: ${MAX_CHUNK_SIZE}`);
-
-    const parallelUploads = [...new Array(concurrency).keys()];
-    core.debug("Awaiting all uploads");
-    let offset = 0;
-
-    try {
-        await Promise.all(
-            parallelUploads.map(async () => {
-                while (offset < fileSize) {
-                    const chunkSize = Math.min(
-                        fileSize - offset,
-                        MAX_CHUNK_SIZE
-                    );
-                    const start = offset;
-                    const end = offset + chunkSize - 1;
-                    offset += MAX_CHUNK_SIZE;
-                    const chunk = fs.createReadStream(archivePath, {
-                        fd,
-                        start,
-                        end,
-                        autoClose: false
-                    });
-
-                    await uploadChunk(
-                        httpClient,
-                        resourceUrl,
-                        chunk,
-                        start,
-                        end
-                    );
-                }
-            })
-        );
-    } finally {
-        fs.closeSync(fd);
-    }
-    return;
-}
-
-async function commitCache(
-    httpClient: HttpClient,
-    cacheId: number,
-    filesize: number
-): Promise<ITypedResponse<null>> {
-    const commitCacheRequest: CommitCacheRequest = { size: filesize };
-    return await httpClient.postJson<null>(
-        getCacheApiUrl(`caches/${cacheId.toString()}`),
-        commitCacheRequest
-    );
-}
-
-export async function saveCache(
-    cacheId: number,
-    archivePath: string
-): Promise<void> {
-    const httpClient = createHttpClient();
-
-    core.debug("Upload cache");
-    await uploadFile(httpClient, cacheId, archivePath);
-
-    // Commit Cache
-    core.debug("Commiting cache");
-    const cacheSize = utils.getArchiveFileSize(archivePath);
-    const commitCacheResponse = await commitCache(
-        httpClient,
-        cacheId,
-        cacheSize
-    );
-    if (!isSuccessStatusCode(commitCacheResponse.statusCode)) {
-        throw new Error(
-            `Cache service responded with ${commitCacheResponse.statusCode} during commit cache.`
-        );
-    }
-
-    core.info("Cache saved successfully");
-}

src/constants.ts

@@ -1,16 +1,22 @@
 export enum Inputs {
-    Key = "key",
-    Path = "path",
-    RestoreKeys = "restore-keys"
+    Key = "key", // Input for cache, restore, save action
+    Path = "path", // Input for cache, restore, save action
+    RestoreKeys = "restore-keys", // Input for cache, restore action
+    UploadChunkSize = "upload-chunk-size", // Input for cache, save action
+    EnableCrossOsArchive = "enableCrossOsArchive", // Input for cache, restore, save action
+    FailOnCacheMiss = "fail-on-cache-miss", // Input for cache, restore action
+    LookupOnly = "lookup-only" // Input for cache, restore action
 }
 
 export enum Outputs {
-    CacheHit = "cache-hit"
+    CacheHit = "cache-hit", // Output from cache, restore action
+    CachePrimaryKey = "cache-primary-key", // Output from restore action
+    CacheMatchedKey = "cache-matched-key" // Output from restore action
 }
 
 export enum State {
-    CacheKey = "CACHE_KEY",
-    CacheResult = "CACHE_RESULT"
+    CachePrimaryKey = "CACHE_KEY",
+    CacheMatchedKey = "CACHE_RESULT"
 }
 
 export enum Events {
@@ -18,3 +24,5 @@ export enum Events {
     Push = "push",
     PullRequest = "pull_request"
 }
+
+export const RefKey = "GITHUB_REF";

src/contracts.d.ts

@@ -1,19 +0,0 @@
-export interface ArtifactCacheEntry {
-    cacheKey?: string;
-    scope?: string;
-    creationTime?: string;
-    archiveLocation?: string;
-}
-
-export interface CommitCacheRequest {
-    size: number;
-}
-
-export interface ReserveCacheRequest {
-    key: string;
-    version?: string;
-}
-
-export interface ReserveCacheResponse {
-    cacheId: number;
-}

src/restore.ts

@@ -1,114 +1,3 @@
-import * as core from "@actions/core";
-import * as path from "path";
-import * as cacheHttpClient from "./cacheHttpClient";
-import { Events, Inputs, State } from "./constants";
-import { extractTar } from "./tar";
-import * as utils from "./utils/actionUtils";
+import { restoreRun } from "./restoreImpl";
 
-async function run(): Promise<void> {
-    try {
-        // Validate inputs, this can cause task failure
-        if (!utils.isValidEvent()) {
-            utils.logWarning(
-                `Event Validation Error: The event type ${
-                    process.env[Events.Key]
-                } is not supported. Only ${utils
-                    .getSupportedEvents()
-                    .join(", ")} events are supported at this time.`
-            );
-            return;
-        }
-
-        const cachePath = utils.resolvePath(
-            core.getInput(Inputs.Path, { required: true })
-        );
-        core.debug(`Cache Path: ${cachePath}`);
-
-        const primaryKey = core.getInput(Inputs.Key, { required: true });
-        core.saveState(State.CacheKey, primaryKey);
-
-        const restoreKeys = core
-            .getInput(Inputs.RestoreKeys)
-            .split("\n")
-            .filter(x => x !== "");
-        const keys = [primaryKey, ...restoreKeys];
-
-        core.debug("Resolved Keys:");
-        core.debug(JSON.stringify(keys));
-
-        if (keys.length > 10) {
-            core.setFailed(
-                `Key Validation Error: Keys are limited to a maximum of 10.`
-            );
-            return;
-        }
-        for (const key of keys) {
-            if (key.length > 512) {
-                core.setFailed(
-                    `Key Validation Error: ${key} cannot be larger than 512 characters.`
-                );
-                return;
-            }
-            const regex = /^[^,]*$/;
-            if (!regex.test(key)) {
-                core.setFailed(
-                    `Key Validation Error: ${key} cannot contain commas.`
-                );
-                return;
-            }
-        }
-
-        try {
-            const cacheEntry = await cacheHttpClient.getCacheEntry(keys);
-            if (!cacheEntry?.archiveLocation) {
-                core.info(
-                    `Cache not found for input keys: ${keys.join(", ")}.`
-                );
-                return;
-            }
-
-            const archivePath = path.join(
-                await utils.createTempDirectory(),
-                "cache.tgz"
-            );
-            core.debug(`Archive Path: ${archivePath}`);
-
-            // Store the cache result
-            utils.setCacheState(cacheEntry);
-
-            // Download the cache from the cache entry
-            await cacheHttpClient.downloadCache(
-                cacheEntry.archiveLocation,
-                archivePath
-            );
-
-            const archiveFileSize = utils.getArchiveFileSize(archivePath);
-            core.info(
-                `Cache Size: ~${Math.round(
-                    archiveFileSize / (1024 * 1024)
-                )} MB (${archiveFileSize} B)`
-            );
-
-            await extractTar(archivePath, cachePath);
-
-            const isExactKeyMatch = utils.isExactKeyMatch(
-                primaryKey,
-                cacheEntry
-            );
-            utils.setCacheHitOutput(isExactKeyMatch);
-
-            core.info(
-                `Cache restored from key: ${cacheEntry && cacheEntry.cacheKey}`
-            );
-        } catch (error) {
-            utils.logWarning(error.message);
-            utils.setCacheHitOutput(false);
-        }
-    } catch (error) {
-        core.setFailed(error.message);
-    }
-}
-
-run();
-
-export default run;
+restoreRun(true);

src/restoreImpl.ts

@@ -0,0 +1,119 @@
+import * as cache from "@actions/cache";
+import * as core from "@actions/core";
+
+import { Events, Inputs, Outputs, State } from "./constants";
+import {
+    IStateProvider,
+    NullStateProvider,
+    StateProvider
+} from "./stateProvider";
+import * as utils from "./utils/actionUtils";
+
+export async function restoreImpl(
+    stateProvider: IStateProvider,
+    earlyExit?: boolean | undefined
+): Promise<string | undefined> {
+    try {
+        if (!utils.isCacheFeatureAvailable()) {
+            core.setOutput(Outputs.CacheHit, "false");
+            return;
+        }
+
+        // Validate inputs, this can cause task failure
+        if (!utils.isValidEvent()) {
+            utils.logWarning(
+                `Event Validation Error: The event type ${
+                    process.env[Events.Key]
+                } is not supported because it's not tied to a branch or tag ref.`
+            );
+            return;
+        }
+
+        const primaryKey = core.getInput(Inputs.Key, { required: true });
+        stateProvider.setState(State.CachePrimaryKey, primaryKey);
+
+        const restoreKeys = utils.getInputAsArray(Inputs.RestoreKeys);
+        const cachePaths = utils.getInputAsArray(Inputs.Path, {
+            required: true
+        });
+        const enableCrossOsArchive = utils.getInputAsBool(
+            Inputs.EnableCrossOsArchive
+        );
+        const failOnCacheMiss = utils.getInputAsBool(Inputs.FailOnCacheMiss);
+        const lookupOnly = utils.getInputAsBool(Inputs.LookupOnly);
+
+        const cacheKey = await cache.restoreCache(
+            cachePaths,
+            primaryKey,
+            restoreKeys,
+            { lookupOnly: lookupOnly },
+            enableCrossOsArchive
+        );
+
+        if (!cacheKey) {
+            core.setOutput(Outputs.CacheHit, false.toString());
+            if (failOnCacheMiss) {
+                throw new Error(
+                    `Failed to restore cache entry. Exiting as fail-on-cache-miss is set. Input key: ${primaryKey}`
+                );
+            }
+            core.info(
+                `Cache not found for input keys: ${[
+                    primaryKey,
+                    ...restoreKeys
+                ].join(", ")}`
+            );
+            return;
+        }
+
+        // Store the matched cache key in states
+        stateProvider.setState(State.CacheMatchedKey, cacheKey);
+
+        const isExactKeyMatch = utils.isExactKeyMatch(
+            core.getInput(Inputs.Key, { required: true }),
+            cacheKey
+        );
+
+        core.setOutput(Outputs.CacheHit, isExactKeyMatch.toString());
+        if (lookupOnly) {
+            core.info(`Cache found and can be restored from key: ${cacheKey}`);
+        } else {
+            core.info(`Cache restored from key: ${cacheKey}`);
+        }
+
+        return cacheKey;
+    } catch (error: unknown) {
+        core.setFailed((error as Error).message);
+        if (earlyExit) {
+            process.exit(1);
+        }
+    }
+}
+
+async function run(
+    stateProvider: IStateProvider,
+    earlyExit: boolean | undefined
+): Promise<void> {
+    await restoreImpl(stateProvider, earlyExit);
+
+    // node will stay alive if any promises are not resolved,
+    // which is a possibility if HTTP requests are dangling
+    // due to retries or timeouts. We know that if we got here
+    // that all promises that we care about have successfully
+    // resolved, so simply exit with success.
+    if (earlyExit) {
+        process.exit(0);
+    }
+}
+
+export async function restoreOnlyRun(
+    earlyExit?: boolean | undefined
+): Promise<void> {
+    await run(new NullStateProvider(), earlyExit);
+}
+
+export async function restoreRun(
+    earlyExit?: boolean | undefined
+): Promise<void> {
+    await run(new StateProvider(), earlyExit);
+}

src/restoreOnly.ts

@@ -0,0 +1,3 @@
+import { restoreOnlyRun } from "./restoreImpl";
+
+restoreOnlyRun(true);

src/save.ts

@@ -1,80 +1,3 @@
-import * as core from "@actions/core";
-import * as path from "path";
-import * as cacheHttpClient from "./cacheHttpClient";
-import { Events, Inputs, State } from "./constants";
-import { createTar } from "./tar";
-import * as utils from "./utils/actionUtils";
+import { saveRun } from "./saveImpl";
 
-async function run(): Promise<void> {
-    try {
-        if (!utils.isValidEvent()) {
-            utils.logWarning(
-                `Event Validation Error: The event type ${
-                    process.env[Events.Key]
-                } is not supported. Only ${utils
-                    .getSupportedEvents()
-                    .join(", ")} events are supported at this time.`
-            );
-            return;
-        }
-
-        const state = utils.getCacheState();
-
-        // Inputs are re-evaluted before the post action, so we want the original key used for restore
-        const primaryKey = core.getState(State.CacheKey);
-        if (!primaryKey) {
-            utils.logWarning(`Error retrieving key from state.`);
-            return;
-        }
-
-        if (utils.isExactKeyMatch(primaryKey, state)) {
-            core.info(
-                `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
-            );
-            return;
-        }
-
-        core.debug("Reserving Cache");
-        const cacheId = await cacheHttpClient.reserveCache(primaryKey);
-        if (cacheId == -1) {
-            core.info(
-                `Unable to reserve cache with key ${primaryKey}, another job may be creating this cache.`
-            );
-            return;
-        }
-        core.debug(`Cache ID: ${cacheId}`);
-        const cachePath = utils.resolvePath(
-            core.getInput(Inputs.Path, { required: true })
-        );
-        core.debug(`Cache Path: ${cachePath}`);
-
-        const archivePath = path.join(
-            await utils.createTempDirectory(),
-            "cache.tgz"
-        );
-        core.debug(`Archive Path: ${archivePath}`);
-
-        await createTar(archivePath, cachePath);
-
-        const fileSizeLimit = 5 * 1024 * 1024 * 1024; // 5GB per repo limit
-        const archiveFileSize = utils.getArchiveFileSize(archivePath);
-        core.debug(`File Size: ${archiveFileSize}`);
-        if (archiveFileSize > fileSizeLimit) {
-            utils.logWarning(
-                `Cache size of ~${Math.round(
-                    archiveFileSize / (1024 * 1024)
-                )} MB (${archiveFileSize} B) is over the 5GB limit, not saving cache.`
-            );
-            return;
-        }
-
-        core.debug(`Saving Cache (ID: ${cacheId})`);
-        await cacheHttpClient.saveCache(cacheId, archivePath);
-    } catch (error) {
-        utils.logWarning(error.message);
-    }
-}
-
-run();
-
-export default run;
+saveRun(true);