setup-go/README.md

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# setup-go
<p align="left">
<a href="https://github.com/actions/setup-go/actions"><img alt="GitHub Actions status" src="https://github.com/actions/setup-go/workflows/build-test/badge.svg"></a>
<a href="https://github.com/actions/setup-go/actions"><img alt="versions status" src="https://github.com/actions/setup-go/workflows/go-versions/badge.svg"></a>
</p>
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
# V2
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](https://github.com/actions/go-versions/blob/main/versions-manifest.json) repository and on miss or failure, it will fall back to the previous behavior of download directly from [go dist](https://storage.googleapis.com/golang).
Matching by semver spec:
```yaml
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:
```yaml
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
```
# Usage
See [action.yml](action.yml)
Basic:
```yaml
steps:
- uses: actions/checkout@master
- uses: actions/setup-go@v1
with:
go-version: '1.9.3' # The Go version to download (if necessary) and use.
- run: go run hello.go
```
Matrix Testing:
```yaml
jobs:
build:
runs-on: ubuntu-16.04
strategy:
matrix:
go: [ '1.14', '1.13' ]
name: Go ${{ matrix.go }} sample
steps:
- uses: actions/checkout@v2
- name: Setup go
uses: actions/setup-go@v1
with:
go-version: ${{ matrix.go }}
- run: go run hello.go
```
# License
The scripts and documentation in this project are released under the [MIT License](LICENSE)
# Contributions
Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
## Code of Conduct
:wave: Be nice. See [our code of conduct](CONDUCT)