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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

- 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-