226 lines
8.3 KiB
Markdown
226 lines
8.3 KiB
Markdown
# setup-go
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[](https://github.com/actions/setup-go/actions/workflows/basic-validation.yml)
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[](https://github.com/actions/setup-go/actions/workflows/versions.yml)
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This action sets up a go environment for use in actions by:
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- Optionally downloading and caching a version of Go by version and adding to `PATH`.
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- Registering problem matchers for error output.
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# V3
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The V3 edition of the action offers:
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- Adds `GOBIN` to the `PATH`
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- Proxy support
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- Check latest version
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- Caching packages dependencies
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- stable and oldstable aliases
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- Bug Fixes (including issues around version matching and semver)
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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](https://github.com/actions/go-versions/blob/main/versions-manifest.json) repository. On miss or failure, it will fall back to downloading directly from [go dist](https://storage.googleapis.com/golang). To change the default behavior, please use the [check-latest input](#check-latest-version).
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**Note:** The `setup-go` action uses executable binaries which are built by Golang side. The action does not build golang from source code.
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Matching by [semver spec](https://github.com/npm/node-semver):
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '^1.13.1' # The Go version to download (if necessary) and use.
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- run: go version
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```
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '>=1.17.0'
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- run: go version
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```
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Matching an unstable pre-release:
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.18.0-rc.1' # The Go version to download (if necessary) and use.
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- run: go version
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```
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.16.0-beta.1' # The Go version to download (if necessary) and use.
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- run: go version
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```
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# Usage
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See [action.yml](action.yml)
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## Basic
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.16.1' # The Go version to download (if necessary) and use.
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- run: go run hello.go
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```
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## Check latest version
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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.
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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.
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> Setting `check-latest` to `true` has performance implications as downloading Go versions is slower than using cached versions.
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.14'
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check-latest: true
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- run: go run hello.go
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```
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## Using stable/oldstable aliases
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If `stable` is provided, action will get the latest stable version from the [`go-versions`](https://github.com/actions/go-versions/blob/main/versions-manifest.json) repository manifest.
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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.
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**Note:** using these aliases will result in same version as using corresponding minor release with `check-latest` input set to `true`
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: 'stable'
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- run: go run hello.go
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```
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: 'oldstable'
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- run: go run hello.go
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```
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## Caching dependency files and build outputs:
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The action has a built-in functionality for caching and restoring go modules and build outputs. It uses [actions/cache](https://github.com/actions/cache) under the hood but requires less configuration settings. The `cache` input is optional, and caching is turned off by default.
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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.
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**Caching without specifying dependency file path**
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.17'
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check-latest: true
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cache: true
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- run: go run hello.go
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```
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**Caching in monorepos**
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version: '1.17'
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check-latest: true
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cache: true
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cache-dependency-path: subdir/go.sum
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- run: go run hello.go
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```
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## Getting go version from the go.mod file
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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](https://github.com/actions/go-versions/blob/main/versions-manifest.json) file or at the go servers.
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If both the `go-version` and the `go-version-file` inputs are provided then the `go-version` input is used.
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> The action will search for the `go.mod` file relative to the repository root
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```yaml
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-go@v3
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with:
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go-version-file: 'path/to/go.mod'
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- run: go version
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```
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## Matrix testing
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```yaml
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jobs:
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build:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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go: [ '1.14', '1.13' ]
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name: Go ${{ matrix.go }} sample
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steps:
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- uses: actions/checkout@v3
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- name: Setup go
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uses: actions/setup-go@v3
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with:
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go-version: ${{ matrix.go }}
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- run: go run hello.go
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```
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### Supported version syntax
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The `go-version` input supports the following syntax:
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- Specific versions: `1.15`, `1.16.1`, `1.17.0-rc.2`, `1.16.0-beta.1`
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- SemVer's version range syntax: `^1.13.1`, `>=1.18.0-rc.1`
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For more information about semantic versioning, please refer to [semver](https://github.com/npm/node-semver) documentation.
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## Using `setup-go` on GHES
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`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`](https://github.com/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](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting). 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.
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To get a higher rate limit, you can [generate a personal access token on github.com](https://github.com/settings/tokens/new) and pass it as the `token` input for the action:
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```yaml
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uses: actions/setup-go@v3
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with:
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token: ${{ secrets.GH_DOTCOM_TOKEN }}
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go-version: 1.18
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```
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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](https://docs.github.com/en/enterprise-server@3.2/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)" for more information.
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# License
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The scripts and documentation in this project are released under the [MIT License](LICENSE)
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# Contributions
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Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
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## Code of Conduct
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:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)
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