mirror of
https://github.com/docker/metadata-action.git
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877 lines
30 KiB
Markdown
877 lines
30 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=ci)
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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. This action
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is particularly useful if used with [Docker Build Push](https://github.com/docker/build-push-action)
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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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* [environment variables](#environment-variables)
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* [`images` input](#images-input)
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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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* [Image name and tag sanitization](#image-name-and-tag-sanitization)
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* [Latest tag](#latest-tag)
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* [`priority` attribute](#priority-attribute)
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* [Global expressions](#global-expressions)
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* [`{{branch}}`](#branch)
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* [`{{tag}}`](#tag)
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* [`{{sha}}`](#sha)
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* [`{{base_ref}}`](#base_ref)
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* [`{{is_default_branch}}`](#is_default_branch)
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* [`{{date '<format>' tz='<timezone>'}}`](#date-format-tztimezone)
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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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* [Contributing](#contributing)
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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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workflow_dispatch:
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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@v3
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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@v4
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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@v2
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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@v4
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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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| `workflow_dispatch` | `refs/heads/master` | `master` |
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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@v3
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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@v4
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with:
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images: |
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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@v2
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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@v4
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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
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declare an empty target named `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@v3
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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@v4
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with:
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images: |
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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@v2
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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
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`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": "860c1904a1ce19322e91ac35af1ab07466440c37",
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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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| Name | Type | Description |
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|---------------------|--------|----------------------------------------------------------|
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| `images` | List | 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 file definition](https://docs.docker.com/build/customize/bake/file-definition/) path |
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Alternatively, each output is also exported as an environment variable:
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* `DOCKER_METADATA_OUTPUT_VERSION`
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* `DOCKER_METADATA_OUTPUT_TAGS`
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* `DOCKER_METADATA_OUTPUT_LABELS`
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* `DOCKER_METADATA_OUTPUT_JSON`
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* `DOCKER_METADATA_OUTPUT_BAKE_FILE`
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So it can be used with our [Docker Build Push action](https://github.com/docker/build-push-action/):
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```yaml
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- uses: docker/build-push-action@v4
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with:
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build-args: |
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DOCKER_METADATA_OUTPUT_JSON
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```
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### environment variables
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| Name | Type | Description |
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|-------------------------------|------|------------------------------------------------------------------------------------------------------------|
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| `DOCKER_METADATA_PR_HEAD_SHA` | Bool | If `true`, set associated head SHA instead of commit SHA that triggered the workflow on pull request event |
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## `images` input
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`images` defines a list of Docker images to use as base name for [`tags`](#tags-input):
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```yaml
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images: |
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name/foo
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ghcr.io/name/bar
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# or
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name=name/foo
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name=ghcr.io/name/bar
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```
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Extended attributes and default values:
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```yaml
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images: |
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name=,enable=true
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```
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* `name=<string>` image base name
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* `enable=<true|false>` enable this entry (default `true`)
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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
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tag and optionally for `latest`
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* `suffix=<string>,onlatest=<true|false>`: A global suffix for each generated
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tag and optionally 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
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reflect the output metadata. This one is in the form of a key-value pair list
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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=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=ref,event=branch
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type=ref,event=pr
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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=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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And global attributes:
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* `enable=<true|false>` enable this entry (default `true`)
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* `priority=<number>` set tag [priority](#priority-attribute) order
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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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# handlebars with timezone
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type=schedule,pattern={{date 'YYYYMMDD-hhmmss' tz='Asia/Tokyo'}}
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```
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Will be used on [schedule event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule).
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`pattern` is a specially crafted attribute to support [Handlebars' template](https://handlebarsjs.com/guide/)
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with the following expressions:
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* `date 'format' tz='Timezone'` ; render date by its [moment format](https://momentjs.com/docs/#/displaying/format/).
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Default `tz` is UTC.
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| Pattern | Output |
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|----------------------------------------------|-------------------|
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| `nightly` | `nightly` |
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| `{{date 'YYYYMMDD'}}` | `20200110` |
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| `{{date 'YYYYMMDD-HHmmss' tz='Asia/Tokyo'}}` | `20200110-093000` |
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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/using-workflows/events-that-trigger-workflows#push)
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and requires a valid [semver](https://semver.org/) Git tag, but you can also
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use a custom value through `value` attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/)
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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}}` | `v2.0.8-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}}` (or `{{raw}}`
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> if specified) as tag because they are updated frequently, and contain many
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> breaking changes that are (by the author's design) not yet fit for public
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> 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/using-workflows/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/),
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but you can also use a custom value through `value` attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/)
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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` |
|
|
| `1.2.3` | `{{version}}` | `1.2.3` |
|
|
| `v1.2.3` | `{{version}}` | `1.2.3` |
|
|
| `1.2.3` | `{{major}}.{{minor}}` | `1.2` |
|
|
| `1.2.3` | `v{{major}}` | `v1` |
|
|
| `v1.2.3rc2` | `{{raw}}` | `v1.2.3rc2` |
|
|
| `1.2.3rc2` | `{{version}}` | `1.2.3rc2` |
|
|
| `1.2.3rc2` | `{{major}}.{{minor}}` | `1.2.3rc2`* |
|
|
| `1.2.3post1` | `{{major}}.{{minor}}` | `1.2.3.post1`* |
|
|
| `1.2.3beta2` | `{{major}}.{{minor}}` | `1.2.3b2`* |
|
|
| `1.0dev4` | `{{major}}.{{minor}}` | `1.0.dev4`* |
|
|
|
|
> *dev/pre/post release will only extend `{{version}}` (or `{{raw}}` if
|
|
> specified) 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.
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
type=pep440,enable=true,priority=900,prefix=,suffix=,pattern=,value=
|
|
```
|
|
|
|
### `type=match`
|
|
|
|
```yaml
|
|
tags: |
|
|
# minimal
|
|
type=match,pattern=\d.\d.\d
|
|
# define match group
|
|
type=match,pattern=v(.*),group=1
|
|
# use custom value instead of git tag
|
|
type=match,pattern=v(.*),group=1,value=v1.0.0
|
|
```
|
|
|
|
Can create a regular expression for matching Git tag with a pattern and
|
|
capturing group. Will be used on a [push tag event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#push)
|
|
but, you can also use a custom value through `value` attribute.
|
|
|
|
| Git tag | Pattern | Group | Output |
|
|
|-------------------------|------------------|---------|------------------------|
|
|
| `v1.2.3` | `\d.\d.\d` | `0` | `1.2.3` |
|
|
| `v2.0.8-beta.67` | `v(.*)` | `1` | `2.0.8-beta.67` |
|
|
| `v2.0.8-beta.67` | `v(\d.\d)` | `1` | `2.0` |
|
|
| `20200110-RC2` | `\d+` | `0` | `20200110` |
|
|
| `p1/v1.2.3` | `p1/v(\d.\d.\d)` | `1` | `1.2.3` |
|
|
|
|
Extended attributes and default values:
|
|
|
|
```yaml
|
|
tags: |
|
|
type=match,enable=true,priority=800,prefix=,suffix=,pattern=,group=0,value=
|
|
```
|
|
|
|
### `type=edge`
|
|
|
|
```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` |
|
|
| `workflow_dispatch` | `refs/heads/master` | `master` |
|
|
|
|
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
|
|
|
|
### Image name and tag sanitization
|
|
|
|
In order to comply with [the specification](https://docs.docker.com/engine/reference/commandline/tag/#description),
|
|
the image name components may contain lowercase letters, digits and separators.
|
|
A separator is defined as a period, one or two underscores, or one or more
|
|
dashes. A name component may not start or end with a separator.
|
|
|
|
A tag name must be a valid ASCII chars sequences and may contain lowercase and
|
|
uppercase letters, digits, underscores, periods and dashes. A tag name may not
|
|
start with a period or a dash and may contain a maximum of 128 characters.
|
|
|
|
To ease the integration in your workflow, this action will automatically:
|
|
|
|
* Lowercase the image name
|
|
* Replace invalid chars sequences with `-` for tags
|
|
|
|
### 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)
|
|
|
|
For conditionally tagging with latest for a specific branch name, e.g. if your
|
|
default branch name is not `master`, use `type=raw` with a boolean expression:
|
|
|
|
```yaml
|
|
tags: |
|
|
# set latest tag for master branch
|
|
type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'master') }}
|
|
```
|
|
|
|
You can also use the [`{{is_default_branch}}` global expression](#is_default_branch)
|
|
to conditionally tag with latest for the default branch:
|
|
|
|
```yaml
|
|
tags: |
|
|
# set latest tag for default branch
|
|
type=raw,value=latest,enable={{is_default_branch}}
|
|
```
|
|
|
|
### `priority` attribute
|
|
|
|
`priority=<int>` attribute is used to sort tags in the final list. The higher
|
|
the value, the higher the priority. The first tag in the list (higher priority)
|
|
will be used as the image version for generated OCI label and [`version` output](#outputs).
|
|
Each tags `type` attribute has a default priority:
|
|
|
|
| Attribute | Default priority |
|
|
|------------|------------------|
|
|
| `schedule` | `1000` |
|
|
| `semver` | `900` |
|
|
| `pep440` | `900` |
|
|
| `match` | `800` |
|
|
| `edge` | `700` |
|
|
| `ref` | `600` |
|
|
| `raw` | `200` |
|
|
| `sha` | `100` |
|
|
|
|
### Global expressions
|
|
|
|
The following [Handlebars' template](https://handlebarsjs.com/guide/) expressions
|
|
for `prefix`, `suffix`, `value` and `enable` attributes are available:
|
|
|
|
```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}}
|
|
```
|
|
|
|
#### `{{branch}}`
|
|
|
|
Returns the branch name that triggered the workflow run. Will be empty if not
|
|
a branch reference:
|
|
|
|
| Event | Ref | Output |
|
|
|----------------|------------------------|-------------|
|
|
| `pull_request` | `refs/pull/2/merge` | |
|
|
| `push` | `refs/heads/master` | `master` |
|
|
| `push` | `refs/heads/my/branch` | `my-branch` |
|
|
| `push tag` | `refs/tags/v1.2.3` | |
|
|
|
|
#### `{{tag}}`
|
|
|
|
Returns the tag name that triggered the workflow run. Will be empty if not a
|
|
tag reference:
|
|
|
|
| Event | Ref | Output |
|
|
|-----------------|-------------------------------|--------------------|
|
|
| `pull_request` | `refs/pull/2/merge` | |
|
|
| `push` | `refs/heads/master` | |
|
|
| `push` | `refs/heads/my/branch` | |
|
|
| `push tag` | `refs/tags/v1.2.3` | `v1.2.3` |
|
|
|
|
#### `{{sha}}`
|
|
|
|
Returns the short commit SHA that triggered the workflow run (e.g., `90dd603`).
|
|
|
|
#### `{{base_ref}}`
|
|
|
|
Returns the base ref or target branch of the pull request that triggered the
|
|
workflow run. Will be empty for a branch reference:
|
|
|
|
| Event | Ref | Output |
|
|
|----------------|-------------------------------|--------------------|
|
|
| `pull_request` | `refs/pull/2/merge` | `master` |
|
|
| `push` | `refs/heads/master` | |
|
|
| `push` | `refs/heads/my/branch` | |
|
|
| `push tag`* | `refs/tags/v1.2.3` | `master` |
|
|
|
|
> *`base_ref` is available in the push payload but doesn't always seem to
|
|
> return the expected branch when the push tag event occurs. It's also
|
|
> [not documented in GitHub docs](https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#push).
|
|
> We keep it for backward compatibility, but it's **not recommended relying on it**.
|
|
> More context in [#192](https://github.com/docker/metadata-action/pull/192#discussion_r854673012).
|
|
|
|
#### `{{is_default_branch}}`
|
|
|
|
Returns `true` if the branch that triggered the workflow run is the default
|
|
one, otherwise `false`.
|
|
|
|
#### `{{date '<format>' tz='<timezone>'}}`
|
|
|
|
Returns the current date rendered by its [moment format](https://momentjs.com/docs/#/displaying/format/).
|
|
Default `tz` is UTC.
|
|
|
|
| Expression | Output example |
|
|
|----------------------------------------------|-----------------------------------------|
|
|
| `{{date 'YYYYMMDD'}}` | `20200110` |
|
|
| `{{date 'dddd, MMMM Do YYYY, h:mm:ss a'}}` | `Friday, January 10th 2020, 3:25:50 pm` |
|
|
| `{{date 'YYYYMMDD-HHmmss' tz='Asia/Tokyo'}}` | `20200110-093000` |
|
|
|
|
### 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/learn-github-actions/expressions#fromjson):
|
|
|
|
```yaml
|
|
-
|
|
name: Docker meta
|
|
uses: docker/metadata-action@v4
|
|
id: meta
|
|
with:
|
|
images: name/app
|
|
-
|
|
name: Build and push
|
|
uses: docker/build-push-action@v4
|
|
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 [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@v4
|
|
with:
|
|
images: name/app
|
|
labels: |
|
|
maintainer=CrazyMax
|
|
org.opencontainers.image.title=MyCustomTitle
|
|
org.opencontainers.image.description=Another description
|
|
org.opencontainers.image.vendor=MyCompany
|
|
```
|
|
|
|
## Contributing
|
|
|
|
Want to contribute? Awesome! You can find information about contributing to
|
|
this project in the [CONTRIBUTING.md](/.github/CONTRIBUTING.md)
|