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cache

This GitHub Action allows caching dependencies and build outputs to improve workflow execution time.

GitHub Actions status

Usage

Pre-requisites

Create a workflow .yml file in your repositories .github/workflows directory. An example workflow is available below. For more information, reference the GitHub Help Documentation for Creating a workflow file.

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

Outputs

  • cache-hit - A boolean value to indicate an exact match was found for the key

See Skipping steps based on cache-hit for info on using this output

Example workflow

name: Example Caching with npm

on: push

jobs:
  build:
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v1

    - name: Cache node_modules
      uses: actions/cache@preview
      with:
        path: node_modules
        key: ${{ runner.os }}-node

    - name: Install Dependencies
      run: npm install
    
    - name: Build
      run: npm run build

    - name: Test
      run: npm run test

Ecosystem Examples

Node - npm

- uses: actions/cache@preview
  with:
    path: node_modules
    key: ${{ runner.os }}-node

Node - Yarn

- uses: actions/cache@preview
  with:
    path: ~/.cache/yarn
    key: ${{ runner.os }}-yarn-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
    restore-keys: |
      ${{ runner.os }}-yarn-      

C# - Nuget

- uses: actions/cache@preview
  with:
    path: ~/.nuget/packages
    key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
    restore-keys: |
      ${{ runner.os }}-nuget-      

Java - Gradle

- uses: actions/cache@preview
  with:
    path: ~/.gradle/caches
    key: gradle-${{ runner.os }}-${{ hashFiles('**/*.gradle') }}
    restore-keys: |
      gradle-${{ runner.os }}-      

Java - Maven

- uses: actions/cache@preview
  with:
    path: ~/.m2/repository
    key: ${{ runner.os }}-maven

Swift, Objective-C - CocoaPods

- uses: actions/cache@preview
  with:
    path: Pods
    key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
    restore-keys: |
      ${{ runner.os }}-pods-      

Ruby - Gem

- uses: actions/cache@preview
  with:
    path: vendor/bundle
    key: ${{ runner.os }}-gem-${{ hashFiles('**/Gemfile.lock') }}
    restore-keys: |
      ${{ runner.os }}-gem-      

Cache Limits

Individual caches are limited to 200MB and a repository can have up to 2GB of caches. Once the 2GB limit is reached, older caches will be evicted based on when the cache was last accessed.

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.

Example:

steps:
  - uses: actions/checkout@v1

  - uses: actions/cache@preview
    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

Note: The id defined in actions/cache must match the id in the if statement (i.e. steps.[ID].outupts.cache-hit)

Contributing

We would love for you to contribute to @actions/cache, pull requests are welcome! Please see the CONTRIBUTING.md for more information.

License

The scripts and documentation in this project are released under the MIT License