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C# - NuGet

Using NuGet lock files:

- uses: actions/cache@v2
  with:
    path: ~/.nuget/packages
    key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
    restore-keys: |
      ${{ runner.os }}-nuget-

Depending on the environment, huge packages might be pre-installed in the global cache folder. With actions/cache@v2 you can now exclude unwanted packages with exclude pattern

- uses: actions/cache@v2
  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

env:
  NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
steps:
  - uses: actions/cache@v2
    with:
      path: ${{ github.workspace }}/.nuget/packages
      key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
      restore-keys: |
        ${{ runner.os }}-nuget-

D - DUB

POSIX

- uses: actions/cache@v2
  with:
    path: ~/.dub
    key: ${{ runner.os }}-dub-${{ hashFiles('**/dub.json') }}
    restore-keys: |
      ${{ runner.os }}-dub-

Windows

- uses: actions/cache@v2
  with:
    path: ~\AppData\Local\dub
    key: ${{ runner.os }}-dub-${{ hashFiles('**/dub.json') }}
    restore-keys: |
      ${{ runner.os }}-dub-

Elixir - Mix

- uses: actions/cache@v2
  with:
    path: |
      deps
      _build
    key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
    restore-keys: |
      ${{ runner.os }}-mix-

Go - Modules

- uses: actions/cache@v2
  with:
    path: ~/go/pkg/mod
    key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
    restore-keys: |
      ${{ runner.os }}-go-

Haskell - Cabal

We cache the elements of the Cabal store separately, as the entirety of ~/.cabal can grow very large for projects with many dependencies.

- name: Cache ~/.cabal/packages, ~/.cabal/store and dist-newstyle
  uses: actions/cache@v2
  with:
    path: |
      ~/.cabal/packages
      ~/.cabal/store
      dist-newstyle
    key: ${{ runner.os }}-${{ matrix.ghc }}

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 on how to disable or stop the Gradle Daemons.

- uses: actions/cache@v2
  with:
    path: |
      ~/.gradle/caches
      ~/.gradle/wrapper
    key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
    restore-keys: |
      ${{ runner.os }}-gradle-

Java - Maven

- name: Cache local Maven repository
  uses: actions/cache@v2
  with:
    path: ~/.m2/repository
    key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
    restore-keys: |
      ${{ runner.os }}-maven-

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

If using npm config to retrieve the cache directory, ensure you run actions/setup-node first to ensure your npm version is correct.

Note: It is not recommended to cache node_modules, as it can break across Node versions and won't work with npm ci

macOS and Ubuntu

- uses: actions/cache@v2
  with:
    path: ~/.npm
    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-node-

Windows

- name: Get npm cache directory
  id: npm-cache
  run: |
    echo "::set-output name=dir::$(npm config get cache)"
- uses: actions/cache@v2
  with:
    path: ${{ steps.npm-cache.outputs.dir }}
    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-node-

Using multiple systems and npm config

- name: Get npm cache directory
  id: npm-cache-dir
  run: |
    echo "::set-output name=dir::$(npm config get cache)"
- uses: actions/cache@v2
  id: npm-cache # use this to check for `cache-hit` ==> if: steps.npm-cache.outputs.cache-hit != 'true'
  with:
    path: ${{ steps.npm-cache-dir.outputs.dir }}
    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-node-

Node - Lerna

- name: restore lerna
  uses: actions/cache@v2
  with:
    path: |
      node_modules
      */*/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.

- name: Get yarn cache directory path
  id: yarn-cache-dir-path
  run: echo "::set-output name=dir::$(yarn cache dir)"

- uses: actions/cache@v2
  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-

Node - Yarn 2

The yarn 2 cache directory will depend on your config. See https://yarnpkg.com/configuration/yarnrc#cacheFolder for more info.

- name: Get yarn cache directory path
  id: yarn-cache-dir-path
  run: echo "::set-output name=dir::$(yarn config get cacheFolder)"

- uses: actions/cache@v2
  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.

    - name: Restore Cache
      id: restore-cache
      uses: actions/cache@v2
      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

- name: Get Composer Cache Directory
  id: composer-cache
  run: |
    echo "::set-output name=dir::$(composer config cache-files-dir)"
- uses: actions/cache@v2
  with:
    path: ${{ steps.composer-cache.outputs.dir }}
    key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
    restore-keys: |
      ${{ runner.os }}-composer-

Python - pip

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

Simple example

- uses: actions/cache@v2
  with:
    path: ~/.cache/pip
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

Replace ~/.cache/pip with the correct path if not using Ubuntu.

Multiple OS's in a workflow

- uses: actions/cache@v2
  if: startsWith(runner.os, 'Linux')
  with:
    path: ~/.cache/pip
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

- uses: actions/cache@v2
  if: startsWith(runner.os, 'macOS')
  with:
    path: ~/Library/Caches/pip
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

- uses: actions/cache@v2
  if: startsWith(runner.os, 'Windows')
  with:
    path: ~\AppData\Local\pip\Cache
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

Multiple OS's in a workflow with a matrix

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@v2
      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+

- name: Get pip cache dir
  id: pip-cache
  run: |
    echo "::set-output name=dir::$(pip cache dir)"

- name: pip cache
  uses: actions/cache@v2
  with:
    path: ${{ steps.pip-cache.outputs.dir }}
    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
    restore-keys: |
      ${{ runner.os }}-pip-

Python - pipenv

- uses: actions/cache@v2
  with:
    path: ~/.local/share/virtualenvs
    key: ${{ runner.os }}-pipenv-${{ hashFiles('Pipfile.lock') }}
    restore-keys: |
      ${{ runner.os }}-pipenv-

R - renv

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

- uses: actions/cache@v2
  with:
    path: ~/.local/share/renv
    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
    restore-keys: |
      ${{ runner.os }}-renv-

Replace ~/.local/share/renv with the correct path if not using Ubuntu.

Multiple OS's in a workflow

- uses: actions/cache@v2
  if: startsWith(runner.os, 'Linux')
  with:
    path: ~/.local/share/renv
    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
    restore-keys: |
      ${{ runner.os }}-renv-

- uses: actions/cache@v2
  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@v2
  if: startsWith(runner.os, 'Windows')
  with:
    path: ~\AppData\Local\renv
    key: ${{ runner.os }}-renv-${{ hashFiles('**/renv.lock') }}
    restore-keys: |
      ${{ runner.os }}-renv-

Ruby - Bundler

Caching gems with Bundler correctly is not trivial and just using actions/cache is not enough.

Instead, it is recommended to use ruby/setup-ruby's bundler-cache: true option whenever possible:

- uses: ruby/setup-ruby@v1
  with:
    ruby-version: ...
    bundler-cache: true

Rust - Cargo

- uses: actions/cache@v2
  with:
    path: |
      ~/.cargo/registry
      ~/.cargo/git
      target
    key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}

Scala - SBT

- name: Cache SBT
  uses: actions/cache@v2
  with:
    path: | 
      ~/.ivy2/cache
      ~/.sbt
    key: ${{ runner.os }}-sbt-${{ hashFiles('**/build.sbt') }}

Swift, Objective-C - Carthage

- uses: actions/cache@v2
  with:
    path: Carthage
    key: ${{ runner.os }}-carthage-${{ hashFiles('**/Cartfile.resolved') }}
    restore-keys: |
      ${{ runner.os }}-carthage-

Swift, Objective-C - CocoaPods

- uses: actions/cache@v2
  with:
    path: Pods
    key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
    restore-keys: |
      ${{ runner.os }}-pods-

Swift - Swift Package Manager

- uses: actions/cache@v2
  with:
    path: .build
    key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
    restore-keys: |
      ${{ runner.os }}-spm-