116 lines
4.0 KiB
Markdown
116 lines
4.0 KiB
Markdown
# GitHub Action to install and setup [`ko`](https://github.com/google/ko)
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[](https://github.com/imjasonh/setup-ko/actions/workflows/use-action.yaml)
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> :warning: Note: `ko` recently [moved to its own GitHub org](https://github.com/ko-build/ko/issues/791), which broke `setup-ko@v0.5` if the `ko` version wasn't specified.
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>
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> To fix this, either upgrade to [`setup-ko@v0.6`](https://github.com/imjasonh/setup-ko/releases/tag/v0.6) or specify `version`
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## Example usage
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```yaml
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name: Publish
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on:
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push:
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branches: ['main']
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jobs:
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publish:
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name: Publish
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runs-on: ubuntu-latest
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steps:
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- uses: actions/setup-go@v2
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with:
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go-version: 1.18
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- uses: actions/checkout@v2
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- uses: imjasonh/setup-ko@v0.6
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- run: ko build
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```
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_That's it!_ This workflow will build and publish your code to [GitHub Container Regsitry](https://ghcr.io).
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By default, the action sets `KO_DOCKER_REPO=ghcr.io/[owner]/[repo]` for all subsequent steps, and uses the `${{ github.token }}` to authorize pushes to GHCR.
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See [documentation for `ko`](https://github.com/google/ko#configuration) to learn more about configuring `ko`.
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The action works on Linux and macOS [runners](https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners). If you'd like support for Windows runners, [let me know](https://github.com/imjasonh/setup-ko/issues/new).
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### Select `ko` version to install
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By default, `imjasonh/setup-ko` installs the [latest released version of `ko`](https://github.com/google/ko/releases).
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You can select a version with the `version` parameter:
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```yaml
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- uses: imjasonh/setup-ko@v0.6
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with:
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version: v0.11.2
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```
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To build and install `ko` from source using `go install`, specify `version: tip`.
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### Pushing to other registries
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By default, `imjasonh/setup-ko` configures `ko` to push images to [GitHub Container Registry](https://ghcr.io), but you can configure it to push to other registries as well.
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If `KO_DOCKER_REPO` is already set when `setup-ko` runs, it will skip logging in to ghcr.io and will propagate `KO_DOCKER_REPO` for subsequent steps.
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To do this, you should provide credentials to authorize the push.
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You can use [encrypted secrets](https://docs.github.com/en/actions/reference/encrypted-secrets) to store the authorization token, and pass it to `ko login` before pushing:
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```
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steps:
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...
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- uses: imjasonh/setup-ko@v0.6
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env:
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KO_DOCKER_REPO: my.registry/my-repo
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- env:
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auth_token: ${{ secrets.auth_token }}
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run: |
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echo "${auth_token}" | ko login https://my.registry --username my-username --password-stdin
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ko build
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```
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### Release Integration
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In addition to publishing images, `ko` can produce YAML files containing references to built images, using [`ko resolve`](https://github.com/google/ko#kubernetes-integration)
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With this action, you can use `ko resolve` to produce output YAML that you then attach to a GitHub Release using the [GitHub CLI](https://cli.github.com).
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For example:
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```yaml
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name: Publish Release YAML
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on:
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release:
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types: ['created']
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jobs:
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publish-release-yaml:
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name: Publish Release YAML
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runs-on: ubuntu-latest
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steps:
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- uses: actions/setup-go@v2
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with:
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go-version: 1.15
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- uses: actions/checkout@v2
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- uses: imjasonh/setup-ko@v0.6
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- name: Generate and upload release.yaml
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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tag=$(echo ${{ github.ref }} | cut -c11-) # get tag name without tags/refs/ prefix.
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ko resolve -t ${tag} -f config/ > release.yaml
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gh release upload ${tag} release.yaml
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```
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### A note on versioning
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The `@v0.4` in the `uses` statement refers to the version _of the action definition in this repo._
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Regardless of what version of the action definition you use, `imjasonh/setup-ko` will install the latest released version of `ko` unless otherwise specified with `version:`.
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