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[](https://github.com/crazy-max/ghaction-docker-meta/releases/latest)
[](https://github.com/marketplace/actions/docker-meta)
[](https://github.com/crazy-max/ghaction-docker-meta/actions?workflow=test)
[](https://codecov.io/gh/crazy-max/ghaction-docker-meta)
[](https://github.com/sponsors/crazy-max)
[](https://www.paypal.me/crazyws)
## About
GitHub Action to extract metadata (tags, labels) for Docker. This action is particularly useful if used with
[Docker Build Push ](https://github.com/docker/build-push-action ) action.
If you are interested, [check out ](https://git.io/Je09Y ) my other :octocat: GitHub Actions!
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___
* [Features ](#features )
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* [Overview ](#overview )
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* [Usage ](#usage )
* [Customizing ](#customizing )
* [inputs ](#inputs )
* [outputs ](#outputs )
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* [Notes ](#notes )
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* [Latest tag ](#latest-tag )
* [Coerces Git tag ](#coerces-git-tag )
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* [Templates available for schedule tag ](#templates-available-for-schedule-tag )
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* [Keep up-to-date with GitHub Dependabot ](#keep-up-to-date-with-github-dependabot )
* [How can I help? ](#how-can-i-help )
* [License ](#license )
## 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
| Event | Ref | Commit SHA | Docker Tags |
|-----------------|-------------------------------|------------|------------------------------------|
| `schedule` | | `45f132a` | `sha-45f132a` , `nightly` |
| `pull_request` | `refs/pull/2/merge` | `a123b57` | `sha-a123b57` , `pr-2` |
| `push` | `refs/heads/<default_branch>` | `676cae2` | `sha-676cae2` , `edge` |
| `push` | `refs/heads/dev` | `cf20257` | `sha-cf20257` , `dev` |
| `push` | `refs/heads/my/branch` | `a5df687` | `sha-a5df687` , `my-branch` |
| `push tag` | `refs/tags/v1.2.3` | `bf4565b` | `sha-bf4565b` , `1.2.3` , `latest` |
| `push tag` | `refs/tags/mytag` | `afb7833` | `sha-afb7833` , `mytag` |
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## Usage
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```yaml
name: ci
on:
schedule:
- cron: '0 10 * * *' # everyday at 10am
push:
branches:
- '**'
tags:
- 'v*.*.*'
pull_request:
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Docker meta
id: docker_meta
uses: crazy-max/ghaction-docker-meta@v1
with:
images: |
name/app
ghcr.io/name/app
tag-sha: true
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Login to DockerHub
if: github.event_name != 'pull_request'
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/amd64,linux/arm64,linux/386
push: ${{ github.event_name != 'pull_request' }}
tags: ${{ steps.docker_meta.outputs.tags }}
labels: ${{ steps.docker_meta.outputs.labels }}
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Description |
|---------------------|----------|------------------------------------|
| `images` | List/CSV | List of Docker images to use as base name for tags |
| `tag-sha` | Bool | Add git short SHA as Docker tag (default `false` ) |
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| `tag-edge` | Bool | Enable edge branch tagging (default `false` ) |
| `tag-edge-branch` | String | Branch that will be tagged as edge (default `repo.default_branch` ) |
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| `tag-coerce-tag` | String | Coerces Git tag to semver if possible using [Handlebars template ](https://handlebarsjs.com/guide/ ) |
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| `tag-schedule` | String | [Handlebars template ](https://handlebarsjs.com/guide/ ) to apply to schedule tag (default `nightly` ) |
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| `sep-tags` | String | Separator to use for tags output (default `\n` ) |
| `sep-labels` | String | Separator to use for labels output (default `\n` ) |
> List/CSV type can be a newline or comma delimited string
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
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| `version` | String | Generated Docker image version |
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| `tags` | String | Generated Docker tags |
| `labels` | String | Generated Docker labels |
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## Notes
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### Latest tag
`latest` tag is created only on `push tag` event and resolves one of the following conditions:
* Git tag is a valid [semver ](https://semver.org/ )
* Provided `tag-coerce-tag` is valid
### Coerces Git tag
Provides a very forgiving translation of a non-semver tag to semver. For more information see
[Coercion section ](https://www.npmjs.com/package/semver#coercion ). `tag-coerce-tag` supports
[Handlebars template ](https://handlebarsjs.com/guide/ ) with the following inputs:
| `tag-coerce-tag` | Git tag | Version |
|-------------------------|----------|---------|
| `{{raw}}` | `v1.2.3` | `1.2.3` |
| `{{major}}.{{minor}}` | `v1.2.3` | `1.2` |
| `{{major}}` | `v1.2.3` | `1` |
| `{{minor}}` | `v1.2.3` | `2` |
| `{{patch}}` | `v1.2.3` | `3` |
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### Templates available for schedule tag
`tag-schedule` is specially crafted input to support [Handlebars template ](https://handlebarsjs.com/guide/ ) with
the following expressions:
| Expression | Example | Description |
|-------------------------|-------------------------------------------|------------------------------------------|
| `{{date 'format'}}` | `{{date 'YYYYMMDD'}}` > `20200110` | Render date by its [moment format ](https://momentjs.com/docs/#/displaying/format/ )
You can find more examples in the [CI workflow ](.github/workflows/ci.yml ).
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## 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"
```
## How can I help?
All kinds of contributions are welcome :raised_hands:! The most basic way to show your support is to star :star2:
the project, or to raise issues :speech_balloon: You can also support this project by
[**becoming a sponsor on GitHub** ](https://github.com/sponsors/crazy-max ) :clap: or by making a
[Paypal donation ](https://www.paypal.me/crazyws ) to ensure this journey continues indefinitely! :rocket:
Thanks again for your support, it is much appreciated! :pray:
## License
MIT. See `LICENSE` for more details.
