setup-go/README.md

setup-go

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.

V3

The V3 edition of the action offers:

• Adds GOBIN to the PATH
• Proxy support
• Check latest version
• Caching packages dependencies
• 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

Usage

See action.yml

Basic

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

Check latest version

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

Caching dependency files and build outputs:

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

Getting go version from the go.mod file

The go-version-file input accepts a path to a go.mod file containing 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

Matrix testing

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

Supported version syntax

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.

License

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

Contributions

Contributions are welcome! See Contributor's Guide

Code of Conduct

👋 Be nice. See our code of conduct