This action sets up a go environment for use in actions by:

• Optionally downloading and caching a version of Go by version and adding to PATH.
• Registering problem matchers for error output.

The V3 edition of the action offers:

• Adds GOBIN to the PATH
• Proxy support
• Check latest version
• Caching packages dependencies
• stable and oldstable aliases
• Bug Fixes (including issues around version matching and semver)

The action will first check the local cache for a version match. If a version is not found locally, it will pull it from the main branch of the go-versions repository. On miss or failure, it will fall back to downloading directly from go dist. To change the default behavior, please use the check-latest input.

Note: The setup-go action uses executable binaries which are built by Golang side. The action does not build golang from source code.

Matching by semver spec:

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '^1.13.1' # The Go version to download (if necessary) and use.
  - run: go version

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '>=1.17.0'
  - run: go version

Matching an unstable pre-release:

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.18.0-rc.1' # The Go version to download (if necessary) and use.
  - run: go version

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.16.0-beta.1' # The Go version to download (if necessary) and use.
  - run: go version

See action.yml

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.16.1' # The Go version to download (if necessary) and use.
  - run: go run hello.go

The check-latest flag defaults to false. Use the default or set check-latest to false if you prefer stability and if you want to ensure a specific Go version is always used.

If check-latest is set to true, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, a Go version will then be downloaded. Set check-latest to true if you want the most up-to-date Go version to always be used.

Setting check-latest to true has performance implications as downloading Go versions is slower than using cached versions.

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.14'
      check-latest: true
  - run: go run hello.go

If stable is provided, action will get the latest stable version from the go-versions repository manifest.

If oldstable is provided, when current release is 1.19.x, action will resolve version as 1.18.x, where x is the latest patch release.

Note: using these aliases will result in same version as using corresponding minor release with check-latest input set to true

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: 'stable'
  - run: go run hello.go

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: 'oldstable'
  - run: go run hello.go

The action has a built-in functionality for caching and restoring go modules and build outputs. It uses actions/cache under the hood but requires less configuration settings. The cache input is optional, and caching is turned off by default.

The action defaults to search for the dependency file - go.sum in the repository root, and uses its hash as a part of the cache key. Use cache-dependency-path input for cases when multiple dependency files are used, or they are located in different subdirectories.

Caching without specifying dependency file path

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.17'
      check-latest: true
      cache: true
  - run: go run hello.go

Caching in monorepos

steps:
  - uses: actions/checkout@v3
  - uses: actions/setup-go@v3
    with:
      go-version: '1.17'
      check-latest: true
      cache: true
      cache-dependency-path: subdir/go.sum
  - run: go run hello.go

The go-version-file input accepts a path to a go.mod file or a go.work file that contains the version of Go to be used by a project. As the go.mod file contains only major and minor (e.g. 1.18) tags, the action will search for the latest available patch version sequentially in the runner's directory with the cached tools, in the version-manifest.json file or at the go servers.

If both the go-version and the go-version-file inputs are provided then the go-version input is used.

The action will search for the go.mod file relative to the repository root

steps:
- uses: actions/checkout@v3
- uses: actions/setup-go@v3
  with:
    go-version-file: 'path/to/go.mod'
- run: go version

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        go: [ '1.14', '1.13' ]
    name: Go ${{ matrix.go }} sample
    steps:
      - uses: actions/checkout@v3
      - name: Setup go
        uses: actions/setup-go@v3
        with:
          go-version: ${{ matrix.go }}
      - run: go run hello.go

The go-version input supports the following syntax:

• Specific versions: 1.15, 1.16.1, 1.17.0-rc.2, 1.16.0-beta.1
• SemVer's version range syntax: ^1.13.1, >=1.18.0-rc.1

For more information about semantic versioning, please refer to semver documentation.

setup-go comes pre-installed on the appliance with GHES if Actions is enabled. When dynamically downloading Go distributions, setup-go downloads distributions from actions/go-versions on github.com (outside of the appliance). These calls to actions/go-versions are made via unauthenticated requests, which are limited to 60 requests per hour per IP. If more requests are made within the time frame, then you will start to see rate-limit errors during downloading that looks like: ##[error]API rate limit exceeded for.... After that error the action will try to download versions directly from https://storage.googleapis.com/golang, but it also can have rate limit so it's better to put token.

To get a higher rate limit, you can generate a personal access token on github.com and pass it as the token input for the action:

uses: actions/setup-go@v3
with:
  token: ${{ secrets.GH_DOTCOM_TOKEN }}
  go-version: 1.18

If the runner is not able to access github.com, any Go versions requested during a workflow run must come from the runner's tool cache. See "Setting up the tool cache on self-hosted runners without internet access" for more information.

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

Contributions are welcome! See Contributor's Guide

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