mirror of
https://github.com/docker/metadata-action.git
synced 2024-12-22 21:15:39 +00:00
214 lines
9.2 KiB
Markdown
214 lines
9.2 KiB
Markdown
[](https://github.com/crazy-max/ghaction-docker-meta/releases/latest)
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[](https://github.com/marketplace/actions/docker-meta)
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[](https://github.com/crazy-max/ghaction-docker-meta/actions?workflow=test)
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[](https://codecov.io/gh/crazy-max/ghaction-docker-meta)
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[](https://github.com/sponsors/crazy-max)
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[](https://www.paypal.me/crazyws)
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## About
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GitHub Action to extract metadata (tags, labels) for Docker. This action is particularly useful if used with
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[Docker Build Push](https://github.com/docker/build-push-action) action.
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If you are interested, [check out](https://git.io/Je09Y) my other :octocat: GitHub Actions!
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___
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* [Features](#features)
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* [Overview](#overview)
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* [Usage](#usage)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [Notes](#notes)
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* [Latest tag](#latest-tag)
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* [`tag-match` examples](#tag-match-examples)
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* [Schedule tag](#schedule-tag)
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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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* [How can I help?](#how-can-i-help)
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* [License](#license)
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## Features
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* Docker tags generated from GitHub action event and Git metadata
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* [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md) used to generate Docker labels
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* [Handlebars template](https://handlebarsjs.com/guide/) to apply to schedule tag
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## Overview
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| Event | Ref | Commit SHA | Docker Tags |
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|-----------------|-------------------------------|------------|-------------------------------------|
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| `schedule` | `refs/heads/master` | `45f132a` | `sha-45f132a`, `nightly` |
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| `pull_request` | `refs/pull/2/merge` | `a123b57` | `sha-a123b57`, `pr-2` |
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| `push` | `refs/heads/master` | `cf20257` | `sha-cf20257`, `master` |
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| `push` | `refs/heads/my/branch` | `a5df687` | `sha-a5df687`, `my-branch` |
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| `push tag` | `refs/tags/v1.2.3` | `bf4565b` | `sha-bf4565b`, `v1.2.3`, `latest` |
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| `push tag` | `refs/tags/mytag` | `afb7833` | `sha-afb7833`, `mytag` |
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## Usage
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```yaml
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name: ci
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on:
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schedule:
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- cron: '0 10 * * *' # everyday at 10am
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push:
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branches:
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- '**'
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tags:
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- 'v*.*.*'
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pull_request:
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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: docker_meta
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uses: crazy-max/ghaction-docker-meta@v1
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with:
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images: name/app
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v1
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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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file: ./Dockerfile
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platforms: linux/amd64,linux/arm64,linux/386
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push: ${{ github.event_name != 'pull_request' }}
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tags: ${{ steps.docker_meta.outputs.tags }}
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labels: ${{ steps.docker_meta.outputs.labels }}
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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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| 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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| `tag-sha` | Bool | Add git short SHA as Docker tag (default `false`) |
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| `tag-edge` | Bool | Enable edge branch tagging (default `false`) |
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| `tag-edge-branch` | String | Branch that will be tagged as edge (default `repo.default_branch`) |
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| `tag-match` | String | RegExp to match against a Git tag and use first match as Docker tag |
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| `tag-match-group` | Number | Group to get if `tag-match` matches (default `0`) |
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| `tag-match-latest` | Bool | Set `latest` Docker tag if `tag-match` matches (default `true`) |
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| `tag-schedule` | String | [Template](#schedule-tag) to apply to schedule tag (default `nightly`) |
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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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> List/CSV type can be a newline or comma delimited string
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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 | Generated Docker image version |
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| `tags` | String | Generated Docker tags |
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| `labels` | String | Generated Docker labels |
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## Notes
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### Latest tag
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Latest Docker tag will be generated by default on `push tag` event. So if for example you push the `v1.2.3` Git tag,
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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
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generated only if the Git tag matches a regular expression with the [`tag-match` input](#tag-match-examples).
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### `tag-match` examples
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| Git tag | `tag-match` | `tag-match-group` | Docker tag
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|-------------------------|------------------------------------|-------------------|------------------|
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| `v1.2.3` | `\d{1,3}.\d{1,3}.\d{1,3}` | `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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| `release1` | `\d{1,3}.\d{1,3}` | `0` | `release1` |
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| `20200110-RC2` | `\d+` | `0` | `20200110` |
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### Schedule tag
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`tag-schedule` is specially crafted input to support [Handlebars template](https://handlebarsjs.com/guide/) with
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the following expressions:
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| Expression | Example | Description |
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|-------------------------|-------------------------------------------|------------------------------------------|
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| `{{date 'format'}}` | `{{date 'YYYYMMDD'}}` > `20200110` | Render date by its [moment format](https://momentjs.com/docs/#/displaying/format/)
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You can find more examples in the [CI workflow](.github/workflows/ci.yml).
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### Overwrite labels
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If some of the [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
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labels generated are not suitable, you can overwrite them like this:
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```yaml
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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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file: ./Dockerfile
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platforms: linux/amd64,linux/arm64,linux/386
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push: ${{ github.event_name != 'pull_request' }}
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tags: ${{ steps.docker_meta.outputs.tags }}
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labels: |
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${{ steps.docker_meta.outputs.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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## Keep up-to-date with GitHub Dependabot
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Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
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has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
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to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
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```yaml
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version: 2
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updates:
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# Maintain dependencies for GitHub Actions
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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interval: "daily"
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```
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## How can I help?
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All kinds of contributions are welcome :raised_hands:! The most basic way to show your support is to star :star2:
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the project, or to raise issues :speech_balloon: You can also support this project by
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[**becoming a sponsor on GitHub**](https://github.com/sponsors/crazy-max) :clap: or by making a
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[Paypal donation](https://www.paypal.me/crazyws) to ensure this journey continues indefinitely! :rocket:
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Thanks again for your support, it is much appreciated! :pray:
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## License
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MIT. See `LICENSE` for more details.
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