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 V2 offers:

• Adds GOBIN to the PATH
• Proxy Support
• stable input
• Bug Fixes (including issues around version matching and semver)

It will first check the local cache for a version match. If version is not found locally, It will pull it from main branch of go-versions repository and on miss or failure, it will fall back to the previous behavior of download directly from go dist.

Matching by semver spec:

steps:
  - uses: actions/checkout@v2
  - uses: actions/setup-go@v2
    with:
      go-version: '^1.13.1' # The Go version to download (if necessary) and use.
  - run: go version

Matching an unstable pre-release:

steps:
  - uses: actions/checkout@v2
  - uses: actions/setup-go@v2
    with:
      stable: 'false'
      go-version: '1.14.0-rc1' # The Go version to download (if necessary) and use.
  - run: go version

See action.yml

Basic:

steps:
  - uses: actions/checkout@master
  - uses: actions/setup-go@v2
    with:
      go-version: '1.16.1' # The Go version to download (if necessary) and use.
  - run: go run hello.go

Check latest version:

In basic example, without check-latest flag, the action tries to resolve version from local cache firstly and download only if it is not found. Local cache on image is updated with a couple of weeks latency.
check-latest flag forces the action to check if the cached version is the latest one. It reduces latency significantly but it is much more likely to incur version downloading.

steps:
  - uses: actions/checkout@master
  - uses: actions/setup-go@v2
    with:
      go-version: '1.14'
      check-latest: true
  - run: go run hello.go

Matrix Testing:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        go: [ '1.14', '1.13' ]
    name: Go ${{ matrix.go }} sample
    steps:
      - uses: actions/checkout@v2
      - name: Setup go
        uses: actions/setup-go@v2
        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-rc2, 1.16.0-beta1
SemVer's version range syntax: ^1.13.1
For more information about semantic versioning please refer semver documentation

The setup-go action doesn't install the latest matched version if the cached version matches one from WF file.
For example:
Currently, there is three go compilers on Ubuntu 20.04.3 LTS virtual environment: 1.15.15, 1.16.12, 1.17.5.
When the 1.17.6 version will be out and there is 1.17.* in go-version field, the cached 1.17.5 version will be used. Not the new one. Until the cached version will be updated to the latest 1.17.6.
If you will specify fully 1.17.6, the default installation process begins.

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

Contributions are welcome! See Contributor's Guide

👋 Be nice. See our code of conduct