metadata-action/README.md at 585ab8356cceca068ecdee9736a6b33922f85979

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About

GitHub Action to extract metadata (tags, labels) for Docker. This action is particularly useful if used with Docker Build Push action.

If you are interested, check out my other :octocat: GitHub Actions!

Features
Usage
- Basic
- Semver
- Complete
Customizing
- inputs
- outputs
Notes
Keep up-to-date with GitHub Dependabot
How can I help?
License

Features

Docker tags generated from GitHub action event and Git metadata
OCI Image Format Specification used to generate Docker labels
Handlebars template to apply to schedule tag

Usage

Basic

Event	Ref	Commit SHA	Docker Tags
`pull_request`	`refs/pull/2/merge`	`a123b57`	`pr-2`
`push`	`refs/heads/master`	`cf20257`	`master`
`push`	`refs/heads/my/branch`	`a5df687`	`my-branch`
`push tag`	`refs/tags/v1.2.3`	`ad132f5`	`v1.2.3`, `latest`
`push tag`	`refs/tags/v2.0.8-beta.67`	`fc89efd`	`v2.0.8-beta.67`, `latest`

name: ci

on:
  push:
    branches:
      - '**'
    tags:
      - 'v*'
  pull_request:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: name/app
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}

Semver

Event	Ref	Commit SHA	Docker Tags
`pull_request`	`refs/pull/2/merge`	`a123b57`	`pr-2`
`push`	`refs/heads/master`	`cf20257`	`master`
`push`	`refs/heads/my/branch`	`a5df687`	`my-branch`
`push tag`	`refs/tags/v1.2.3`	`ad132f5`	`1.2.3`, `1.2`, `latest`
`push tag`	`refs/tags/v2.0.8-beta.67`	`fc89efd`	`2.0.8-beta.67`

name: ci

on:
  push:
    branches:
      - '**'
    tags:
      - 'v*'
  pull_request:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: name/app
          tag-semver: |
            {{version}}
            {{major}}.{{minor}}            
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}

Complete

Event	Ref	Commit SHA	Docker Tags
`schedule`	`refs/heads/master`	`45f132a`	`sha-45f132a`, `nightly`
`pull_request`	`refs/pull/2/merge`	`a123b57`	`sha-a123b57`, `pr-2`
`push`	`refs/heads/master`	`cf20257`	`sha-cf20257`, `master`
`push`	`refs/heads/my/branch`	`a5df687`	`sha-a5df687`, `my-branch`
`push tag`	`refs/tags/v1.2.3`	`ad132f5`	`sha-ad132f5`, `1.2.3`, `1.2`, `latest`
`push tag`	`refs/tags/v2.0.8-beta.67`	`fc89efd`	`sha-fc89efd`, `2.0.8-beta.67`

name: ci

on:
  schedule:
    - cron: '0 10 * * *' # everyday at 10am
  push:
    branches:
      - '**'
    tags:
      - 'v*'
  pull_request:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: name/app
          tag-sha: true
          tag-semver: |
            {{version}}
            {{major}}.{{minor}}            
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}

Customizing

inputs

Following inputs can be used as step.with keys

Name	Type	Description
`images`	List/CSV	List of Docker images to use as base name for tags
`tag-sha`	Bool	Add git short SHA as Docker tag (default `false`)
`tag-edge`	Bool	Enable edge branch tagging (default `false`)
`tag-edge-branch`	String	Branch that will be tagged as edge (default `repo.default_branch`)
`tag-semver`	List/CSV	Handle Git tag as semver template if possible
`tag-match`	String	RegExp to match against a Git tag and use first match as Docker tag
`tag-match-group`	Number	Group to get if `tag-match` matches (default `0`)
`tag-latest`	Bool	Set `latest` Docker tag if `tag-semver`, `tag-match` or Git tag event occurs (default `true`)
`tag-schedule`	String	Template to apply to schedule tag (default `nightly`)
`tag-custom`	List/CSV	List of custom tags
`tag-custom-only`	Bool	Only use `tag-custom` as Docker tags
`sep-tags`	String	Separator to use for tags output (default `\n`)
`sep-labels`	String	Separator to use for labels output (default `\n`)

List/CSV type can be a newline or comma delimited string

tag-semver and tag-match are mutually exclusive

outputs

Following outputs are available

Name	Type	Description
`version`	String	Generated Docker image version
`tags`	String	Generated Docker tags
`labels`	String	Generated Docker labels

Notes

Latest tag

Latest Docker tag will be generated by default on push tag event. If for example you push the v1.2.3 Git tag, you will have at the output of this action the Docker tags v1.2.3 and latest. But you can allow the latest tag to be generated only if tag-semver is a valid semver or if Git tag matches a regular expression with the tag-match input. Can be disabled if tag-latest is false.

Handle semver tag

If Git tag is a valid semver you can handle it to output multi Docker tags at once. tag-semver supports multi-line Handlebars template with the following inputs:

Git tag	`tag-semver`	Valid	Output tags	Output version
`v1.2.3`	`{{raw}}`	✅	`v1.2.3`, `latest`	`v1.2.3`
`v1.2.3`	`{{version}}`	✅	`1.2.3`, `latest`	`1.2.3`
`v1.2.3`	`{{major}}.{{minor}}`	✅	`1.2`, `latest`	`1.2`
`v1.2.3`	`v{{major}}`	✅	`v1`, `latest`	`v1`
`v1.2.3`	`{{minor}}`	✅	`2`, `latest`	`2`
`v1.2.3`	`{{patch}}`	✅	`3`, `latest`	`3`
`v1.2.3`	`{{major}}.{{minor}}` `{{major}}.{{minor}}.{{patch}}`	✅	`1.2`, `1.2.3`, `latest`	`1.2`*
`v2.0.8-beta.67`	`{{raw}}`	✅	`2.0.8-beta.67`**	`2.0.8-beta.67`
`v2.0.8-beta.67`	`{{version}}`	✅	`2.0.8-beta.67`	`2.0.8-beta.67`
`v2.0.8-beta.67`	`{{major}}.{{minor}}`	✅	`2.0.8-beta.67`**	`2.0.8-beta.67`
`release1`	`{{raw}}`	❌	`release1`	`release1`

*First occurrence of tag-semver will be taken as output.version

**Pre-release (rc, beta, alpha) will only extend {{version}} as tag because they are updated frequently, and contain many breaking changes that are (by the author's design) not yet fit for public consumption.

`tag-match` examples

Git tag	`tag-match`	`tag-match-group`	Match	Output tags	Output version
`v1.2.3`	`\d{1,3}.\d{1,3}.\d{1,3}`	`0`	✅	`1.2.3`, `latest`	`1.2.3`
`v2.0.8-beta.67`	`v(.*)`	`1`	✅	`2.0.8-beta.67`, `latest`	`2.0.8-beta.67`
`v2.0.8-beta.67`	`v(\d.\d)`	`1`	✅	`2.0`, `latest`	`2.0`
`release1`	`\d{1,3}.\d{1,3}`	`0`	❌	`release1`	`release1`
`20200110-RC2`	`\d+`	`0`	✅	`20200110`, `latest`	`20200110`

Schedule tag

tag-schedule is specially crafted input to support Handlebars template with the following expressions:

Expression	Example	Description
`{{date 'format'}}`	`{{date 'YYYYMMDD'}}` > `20200110`	Render date by its moment format

You can find more examples in the CI workflow.

Overwrite labels

If some of the OCI Image Format Specification labels generated are not suitable, you can overwrite them like this:

      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: |
            ${{ steps.docker_meta.outputs.labels }}
            org.opencontainers.image.title=MyCustomTitle
            org.opencontainers.image.description=Another description
            org.opencontainers.image.vendor=MyCompany

Keep up-to-date with GitHub Dependabot

Since Dependabot has native GitHub Actions support, to enable it on your GitHub repo all you need to do is add the .github/dependabot.yml file:

version: 2
updates:
  # Maintain dependencies for GitHub Actions
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"

How can I help?

All kinds of contributions are welcome 🙌! The most basic way to show your support is to star 🌟 the project, or to raise issues 💬 You can also support this project by becoming a sponsor on GitHub 👏 or by making a Paypal donation to ensure this journey continues indefinitely! 🚀

Thanks again for your support, it is much appreciated! 🙏

License

MIT. See LICENSE for more details.

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