mirror of
https://github.com/docker/metadata-action.git
synced 2024-11-09 13:45:41 +01:00
701 lines
23 KiB
Markdown
701 lines
23 KiB
Markdown
[](https://github.com/docker/metadata-action/releases/latest)
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[](https://github.com/marketplace/actions/docker-metadata-action)
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[](https://github.com/docker/metadata-action/actions?workflow=test)
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[](https://codecov.io/gh/docker/metadata-action)
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## About
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GitHub Action to extract metadata from Git reference and GitHub events.
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This action is particularly useful if used with [Docker Build Push](https://github.com/docker/build-push-action) action to tag and label Docker images.
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___
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* [Usage](#usage)
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* [Basic](#basic)
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* [Semver](#semver)
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* [Bake definition](#bake-definition)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [`flavor` input](#flavor-input)
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* [`tags` input](#tags-input)
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* [`type=schedule`](#typeschedule)
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* [`type=semver`](#typesemver)
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* [`type=pep440`](#typepep440)
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* [`type=match`](#typematch)
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* [`type=edge`](#typeedge)
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* [`type=ref`](#typeref)
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* [`type=raw`](#typeraw)
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* [`type=sha`](#typesha)
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* [Notes](#notes)
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* [Latest tag](#latest-tag)
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* [Global expressions](#global-expressions)
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* [Major version zero](#major-version-zero)
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* [JSON output object](#json-output-object)
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* [Overwrite labels](#overwrite-labels)
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* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
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## Usage
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### Basic
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```yaml
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name: ci
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on:
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push:
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branches:
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- 'master'
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tags:
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- 'v*'
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pull_request:
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branches:
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- 'master'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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-
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name: Docker meta
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id: meta
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uses: docker/metadata-action@v3
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with:
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images: name/app
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-
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name: Login to DockerHub
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if: github.event_name != 'pull_request'
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: .
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push: ${{ github.event_name != 'pull_request' }}
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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```
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| Event | Ref | Docker Tags |
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|-----------------|-------------------------------|-------------------------------------|
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| `pull_request` | `refs/pull/2/merge` | `pr-2` |
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| `push` | `refs/heads/master` | `master` |
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| `push` | `refs/heads/releases/v1` | `releases-v1` |
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| `push tag` | `refs/tags/v1.2.3` | `v1.2.3`, `latest` |
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| `push tag` | `refs/tags/v2.0.8-beta.67` | `v2.0.8-beta.67`, `latest` |
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### Semver
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```yaml
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name: ci
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on:
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push:
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branches:
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- 'master'
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tags:
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- 'v*'
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pull_request:
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branches:
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- 'master'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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-
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name: Docker meta
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id: meta
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uses: docker/metadata-action@v3
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with:
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images: name/app
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tags: |
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type=ref,event=branch
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type=ref,event=pr
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type=semver,pattern={{version}}
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type=semver,pattern={{major}}.{{minor}}
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-
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name: Login to DockerHub
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if: github.event_name != 'pull_request'
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: .
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push: ${{ github.event_name != 'pull_request' }}
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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```
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| Event | Ref | Docker Tags |
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|-----------------|-------------------------------|-------------------------------------|
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| `pull_request` | `refs/pull/2/merge` | `pr-2` |
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| `push` | `refs/heads/master` | `master` |
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| `push` | `refs/heads/releases/v1` | `releases-v1` |
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| `push tag` | `refs/tags/v1.2.3` | `1.2.3`, `1.2`, `latest` |
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| `push tag` | `refs/tags/v2.0.8-beta.67` | `2.0.8-beta.67` |
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### Bake definition
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This action also handles a bake definition file that can be used with the
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[Docker Bake action](https://github.com/docker/bake-action). You just have to declare an empty target named
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`docker-metadata-action` and inherit from it.
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```hcl
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// docker-bake.hcl
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target "docker-metadata-action" {}
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target "build" {
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inherits = ["docker-metadata-action"]
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context = "./"
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dockerfile = "Dockerfile"
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platforms = [
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"linux/amd64",
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"linux/arm/v6",
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"linux/arm/v7",
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"linux/arm64",
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"linux/386"
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]
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}
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```
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```yaml
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name: ci
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on:
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push:
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branches:
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- 'master'
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tags:
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- 'v*'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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-
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name: Docker meta
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id: meta
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uses: docker/metadata-action@v3
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with:
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images: name/app
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tags: |
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type=ref,event=branch
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type=ref,event=pr
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type=semver,pattern={{version}}
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type=semver,pattern={{major}}.{{minor}}
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type=sha
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-
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name: Build
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uses: docker/bake-action@v1
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with:
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files: |
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./docker-bake.hcl
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${{ steps.meta.outputs.bake-file }}
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targets: build
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```
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Content of `${{ steps.meta.outputs.bake-file }}` file will look like this with `refs/tags/v1.2.3` ref:
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```json
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{
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"target": {
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"docker-metadata-action": {
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"tags": [
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"name/app:1.2.3",
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"name/app:1.2",
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"name/app:sha-90dd603",
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"name/app:latest"
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],
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"labels": {
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"org.opencontainers.image.title": "Hello-World",
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"org.opencontainers.image.description": "This your first repo!",
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"org.opencontainers.image.url": "https://github.com/octocat/Hello-World",
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"org.opencontainers.image.source": "https://github.com/octocat/Hello-World",
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"org.opencontainers.image.version": "1.2.3",
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"org.opencontainers.image.created": "2020-01-10T00:30:00.000Z",
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"org.opencontainers.image.revision": "90dd6032fac8bda1b6c4436a2e65de27961ed071",
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"org.opencontainers.image.licenses": "MIT"
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},
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"args": {
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"DOCKER_META_IMAGES": "name/app",
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"DOCKER_META_VERSION": "1.2.3"
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}
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}
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}
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}
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```
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## Customizing
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### inputs
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Following inputs can be used as `step.with` keys
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> `List` type is a newline-delimited string
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> ```yaml
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> labels: |
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> org.opencontainers.image.title=MyCustomTitle
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> org.opencontainers.image.description=Another description
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> org.opencontainers.image.vendor=MyCompany
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> ```
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> `CSV` type is a comma-delimited string
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> ```yaml
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> images: name/app,ghcr.io/name/app
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> ```
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| Name | Type | Description |
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|---------------------|----------|------------------------------------|
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| `images` | List/CSV | List of Docker images to use as base name for tags |
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| `tags` | List | List of [tags](#tags-input) as key-value pair attributes |
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| `flavor` | List | [Flavor](#flavor-input) to apply |
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| `labels` | List | List of custom labels |
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| `sep-tags` | String | Separator to use for tags output (default `\n`) |
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| `sep-labels` | String | Separator to use for labels output (default `\n`) |
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| `bake-target` | String | Bake target name (default `docker-metadata-action`) |
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### outputs
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Following outputs are available
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| Name | Type | Description |
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|---------------|---------|---------------------------------------|
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| `version` | String | Docker image version |
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| `tags` | String | Docker tags |
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| `labels` | String | Docker labels |
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| `json` | String | JSON output of tags and labels |
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| `bake-file` | File | [Bake definition file](https://github.com/docker/buildx#file-definition) path |
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## `flavor` input
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`flavor` defines a global behavior for [`tags`](#tags-input):
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```yaml
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flavor: |
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latest=auto
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prefix=
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suffix=
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```
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* `latest=<auto|true|false>`: Handle [latest tag](#latest-tag) (default `auto`)
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* `prefix=<string>,onlatest=<true|false>`: A global prefix for each generated tag and optionnally for `latest`
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* `suffix=<string>,onlatest=<true|false>`: A global suffix for each generated tag and optionnally for `latest`
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## `tags` input
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`tags` is the core input of this action as everything related to it will reflect the output metadata. This one is in
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the form of a key-value pair list in CSV format to remove limitations intrinsically linked to GitHub Actions
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(only string format is handled in the input fields). Here is an example:
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```yaml
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tags: |
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type=schedule
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type=ref,event=branch
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type=ref,event=pr
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type=semver,pattern={{version}}
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type=semver,pattern={{major}}.{{minor}}
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type=semver,pattern={{major}}
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type=sha
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```
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Each entry is defined by a `type`, which are:
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* [`type=schedule`](#typeschedule)
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* [`type=semver`](#typesemver)
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* [`type=match`](#typematch)
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* [`type=edge`](#typeedge)
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* [`type=ref`](#typeref)
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* [`type=raw`](#typeraw)
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* [`type=sha`](#typesha)
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And global attributes:
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* `enable=<true|false>` enable this entry (default `true`)
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* `priority=<number>` priority to manage the order of tags
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* `prefix=<string>` add prefix
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* `suffix=<string>` add suffix
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Default entries if `tags` input is empty:
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```yaml
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tags: |
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type=schedule
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type=ref,event=branch
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type=ref,event=tag
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type=ref,event=pr
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```
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### `type=schedule`
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```yaml
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tags: |
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# minimal
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type=schedule
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# default
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type=schedule,pattern=nightly
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# handlebars
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type=schedule,pattern={{date 'YYYYMMDD'}}
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```
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Will be used on [schedule event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#schedule).
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`pattern` is a specially crafted attribute to support [Handlebars template](https://handlebarsjs.com/guide/) with
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the following expressions:
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* `date 'format'` ; render date by its [moment format](https://momentjs.com/docs/#/displaying/format/)
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| Pattern | Output |
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|--------------------------|----------------------|
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| `nightly` | `nightly` |
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| `{{date 'YYYYMMDD'}}` | `20210326` |
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Extended attributes and default values:
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```yaml
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tags: |
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type=schedule,enable=true,priority=1000,prefix=,suffix=,pattern=nightly
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```
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### `type=semver`
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```yaml
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tags: |
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# minimal
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type=semver,pattern={{version}}
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# use custom value instead of git tag
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type=semver,pattern={{version}},value=v1.0.0
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```
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Will be used on a [push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)
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and requires a valid [semver](https://semver.org/) Git tag, but you can also use a custom value through `value`
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attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/) with the following expressions:
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* `raw` ; the actual tag
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* `version` ; shorthand for `{{major}}.{{minor}}.{{patch}}` (can include pre-release)
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* `major` ; major version identifier
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* `minor` ; minor version identifier
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* `patch` ; patch version identifier
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| Git tag | Pattern | Output |
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|--------------------|----------------------------------------------------------|----------------------|
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| `v1.2.3` | `{{raw}}` | `v1.2.3` |
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| `v1.2.3` | `{{version}}` | `1.2.3` |
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| `v1.2.3` | `{{major}}.{{minor}}` | `1.2` |
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| `v1.2.3` | `v{{major}}` | `v1` |
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| `v1.2.3` | `{{minor}}` | `2` |
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| `v1.2.3` | `{{patch}}` | `3` |
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| `v2.0.8-beta.67` | `{{raw}}` | `2.0.8-beta.67`* |
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| `v2.0.8-beta.67` | `{{version}}` | `2.0.8-beta.67` |
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| `v2.0.8-beta.67` | `{{major}}.{{minor}}` | `2.0.8-beta.67`* |
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> *Pre-release (rc, beta, alpha) will only extend `{{version}}` as tag because they are updated frequently,
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> and contain many breaking changes that are (by the author's design) not yet fit for public consumption.
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Extended attributes and default values:
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```yaml
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tags: |
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type=semver,enable=true,priority=900,prefix=,suffix=,pattern=,value=
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```
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### `type=pep440`
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```yaml
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tags: |
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# minimal
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type=pep440,pattern={{version}}
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# use custom value instead of git tag
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type=pep440,pattern={{version}},value=1.0.0
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```
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Will be used on a [push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)
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and requires a Git tag that conforms to [PEP 440](https://www.python.org/dev/peps/pep-0440/), but you can also use a
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custom value through `value` attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/) with the following expressions:
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* `raw` ; the actual tag
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* `version` ; cleaned version
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* `major` ; major version identifier
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* `minor` ; minor version identifier
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* `patch` ; patch version identifier
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| Git tag | Pattern | Output |
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|--------------------|----------------------------------------------------------|----------------------|
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| `1.2.3` | `{{raw}}` | `1.2.3` |
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| `1.2.3` | `{{version}}` | `1.2.3` |
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| `v1.2.3` | `{{version}}` | `1.2.3` |
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| `1.2.3` | `{{major}}.{{minor}}` | `1.2` |
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| `1.2.3` | `v{{major}}` | `v1` |
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| `1.2.3rc2` | `{{raw}}` | `1.2.3rc2`* |
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| `1.2.3rc2` | `{{version}}` | `1.2.3rc2` |
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| `1.2.3rc2` | `{{major}}.{{minor}}` | `1.2.3rc2`* |
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| `1.2.3post1` | `{{major}}.{{minor}}` | `1.2.3.post1`* |
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| `1.2.3beta2` | `{{major}}.{{minor}}` | `1.2.3b2`* |
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| `1.0dev4` | `{{major}}.{{minor}}` | `1.0.dev4`* |
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> *dev/pre/post release will only extend `{{version}}` as tag because they are updated frequently,
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> and contain many breaking changes that are (by the author's design) not yet fit for public consumption.
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Extended attributes and default values:
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```yaml
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tags: |
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type=pep440,enable=true,priority=900,prefix=,suffix=,pattern=,value=
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```
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### `type=match`
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```yaml
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tags: |
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# minimal
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type=match,pattern=\d.\d.\d
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# define match group
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type=match,pattern=v(.*),group=1
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# use custom value instead of git tag
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type=match,pattern=v(.*),group=1,value=v1.0.0
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```
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Can create a regular expression for matching Git tag with a pattern and capturing group. Will be used on a
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[push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push) but you can also use
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a custom value through `value` attribute.
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| Git tag | Pattern | Group | Output |
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|-------------------------|-------------------------------|---------|------------------------|
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| `v1.2.3` | `\d.\d.\d` | `0` | `1.2.3` |
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| `v2.0.8-beta.67` | `v(.*)` | `1` | `2.0.8-beta.67` |
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| `v2.0.8-beta.67` | `v(\d.\d)` | `1` | `2.0` |
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| `20200110-RC2` | `\d+` | `0` | `20200110` |
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| `p1/v1.2.3` | `p1-v(\d.\d.\d)` | `1` | `1.2.3` |
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Extended attributes and default values:
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```yaml
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tags: |
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type=match,enable=true,priority=800,prefix=,suffix=,pattern=,group=0,value=
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```
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### `type=edge`
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```yaml
|
|
tags: |
|
|
# minimal
|
|
type=edge
|
|
# define default branch
|
|
type=edge,branch=main
|
|
```
|
|
|
|
An `edge` tag reflects the last commit of the active branch on your Git repository. I usually prefer to use `edge`
|
|
as a Docker tag for a better distinction or common pattern. This is also used by official images
|
|
like [Alpine](https://hub.docker.com/_/alpine).
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
type=edge,enable=true,priority=700,prefix=,suffix=,branch=$repo.default_branch
|
|
```
|
|
|
|
### `type=ref`
|
|
|
|
```yaml
|
|
tags: |
|
|
# branch event
|
|
type=ref,event=branch
|
|
# tag event
|
|
type=ref,event=tag
|
|
# pull request event
|
|
type=ref,event=pr
|
|
```
|
|
|
|
This type handles Git ref (or reference) for the following events:
|
|
* `branch` ; eg. `refs/heads/master`
|
|
* `tag` ; eg. `refs/tags/v1.0.0`
|
|
* `pr` ; eg. `refs/pull/318/merge`
|
|
|
|
| Event | Ref | Output |
|
|
|-----------------|-------------------------------|-------------------------------|
|
|
| `pull_request` | `refs/pull/2/merge` | `pr-2` |
|
|
| `push` | `refs/heads/master` | `master` |
|
|
| `push` | `refs/heads/my/branch` | `my-branch` |
|
|
| `push tag` | `refs/tags/v1.2.3` | `v1.2.3` |
|
|
| `push tag` | `refs/tags/v2.0.8-beta.67` | `v2.0.8-beta.67` |
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
# branch event
|
|
type=ref,enable=true,priority=600,prefix=,suffix=,event=branch
|
|
# tag event
|
|
type=ref,enable=true,priority=600,prefix=,suffix=,event=tag
|
|
# pull request event
|
|
type=ref,enable=true,priority=600,prefix=pr-,suffix=,event=pr
|
|
```
|
|
|
|
### `type=raw`
|
|
|
|
```yaml
|
|
tags: |
|
|
type=raw,value=foo
|
|
type=raw,value=bar
|
|
# or
|
|
type=raw,foo
|
|
type=raw,bar
|
|
# or
|
|
foo
|
|
bar
|
|
```
|
|
|
|
Output custom tags according to your needs.
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
type=raw,enable=true,priority=200,prefix=,suffix=,value=
|
|
```
|
|
|
|
### `type=sha`
|
|
|
|
```yaml
|
|
tags: |
|
|
# minimal (short sha)
|
|
type=sha
|
|
# full length sha
|
|
type=sha,format=long
|
|
```
|
|
|
|
Output Git short commit (or long if specified) as Docker tag like `sha-ad132f5`.
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
type=sha,enable=true,priority=100,prefix=sha-,suffix=,format=short
|
|
```
|
|
|
|
## Notes
|
|
|
|
### Latest tag
|
|
|
|
`latest` tag is handled through the [`flavor` input](#flavor-input). It will be generated by default (`auto` mode) for:
|
|
* [`type=ref,event=tag`](#typeref)
|
|
* [`type=semver,pattern=...`](#typesemver)
|
|
* [`type=match,pattern=...`](#typematch)
|
|
|
|
### Global expressions
|
|
|
|
The following [Handlebars template](https://handlebarsjs.com/guide/) expressions for `prefix`, `suffix` and `value`
|
|
attributes are available:
|
|
|
|
| Expression | Output |
|
|
|--------------------------|----------------------|
|
|
| `{{branch}}` | `master` |
|
|
| `{{tag}}` | `v1.2.3` |
|
|
| `{{sha}}` | `90dd603` |
|
|
|
|
```yaml
|
|
tags: |
|
|
# dynamically set the branch name as a prefix
|
|
type=sha,prefix={{branch}}-
|
|
# dynamically set the branch name and sha as a custom tag
|
|
type=raw,value=mytag-{{branch}}-{{sha}}
|
|
```
|
|
|
|
### Major version zero
|
|
|
|
Major version zero (`0.y.z`) is for initial development and **may** change at any time. This means the public API
|
|
[**should not** be considered stable](https://semver.org/#spec-item-4).
|
|
|
|
In this case, Docker tag `0` **should not** be generated if you're using [`type=semver`](#typesemver) with `{{major}}`
|
|
pattern. You can manage this behavior like this:
|
|
|
|
```yaml
|
|
# refs/tags/v0.1.2
|
|
tags: |
|
|
# output 0.1.2
|
|
type=semver,pattern={{version}}
|
|
# output 0.1
|
|
type=semver,pattern={{major}}.{{minor}}
|
|
# disabled if major zero
|
|
type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
|
|
```
|
|
|
|
### JSON output object
|
|
|
|
The `json` output is a JSON object composed of the generated tags and labels so that you can reuse them further in your
|
|
workflow using the [`fromJSON` function](https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#fromjson):
|
|
|
|
```yaml
|
|
-
|
|
name: Docker meta
|
|
uses: docker/metadata-action@v3
|
|
id: meta
|
|
with:
|
|
images: name/app
|
|
-
|
|
name: Build and push
|
|
uses: docker/build-push-action@v2
|
|
with:
|
|
tags: ${{ steps.meta.outputs.tags }}
|
|
labels: ${{ steps.meta.outputs.labels }}
|
|
build-args: |
|
|
BUILDTIME=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
|
|
VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
|
|
REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
|
|
```
|
|
|
|
### Overwrite labels
|
|
|
|
If some of the [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
|
|
labels generated are not suitable, you can overwrite them like this:
|
|
|
|
```yaml
|
|
-
|
|
name: Docker meta
|
|
id: meta
|
|
uses: docker/metadata-action@v3
|
|
with:
|
|
images: name/app
|
|
labels: |
|
|
maintainer=CrazyMax
|
|
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](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
|
|
has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
|
|
to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
|
|
|
|
```yaml
|
|
version: 2
|
|
updates:
|
|
# Maintain dependencies for GitHub Actions
|
|
- package-ecosystem: "github-actions"
|
|
directory: "/"
|
|
schedule:
|
|
interval: "daily"
|
|
```
|