metadata-action/README.md

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## About
GitHub Action to extract metadata (tags, labels) for Docker. This action is particularly useful if used with
[Docker Build Push](https://github.com/docker/build-push-action) action.
If you are interested, [check out](https://git.io/Je09Y) my other :octocat: GitHub Actions!
![Screenshot](.github/ghaction-docker-meta.png)
___
* [Features](#features)
* [Overview](#overview)
* [Usage](#usage)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [Notes](#notes)
* [`tag-match` examples](#tag-match-examples)
* [Schedule tag](#schedule-tag)
* [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
* Docker tags generated from GitHub action event and Git metadata
* [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md) used to generate Docker labels
* [Handlebars template](https://handlebarsjs.com/guide/) to apply to schedule tag
## Overview
| Event | Ref | Commit SHA | Docker Tags |
|-----------------|-------------------------------|------------|-------------------------------------|
| `schedule` | `refs/heads/master` | `45f132a` | `sha-45f132a`, `nightly` |
| `pull_request` | `refs/pull/2/merge` | `a123b57` | `sha-a123b57`, `pr-2` |
| `push` | `refs/heads/<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` |
## Usage
```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
tag-sha: true
tag-match: \\d{1,3}.\\d{1,3}.\\d{1,3}
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Login to DockerHub
if: github.event_name != 'pull_request'
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/amd64,linux/arm64,linux/386
push: ${{ github.event_name != 'pull_request' }}
tags: ${{ steps.docker_meta.outputs.tags }}
labels: ${{ steps.docker_meta.outputs.labels }}
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Description |
|---------------------|----------|------------------------------------|
| `images` | List/CSV | List of Docker images to use as base name for tags |
| `tag-sha` | Bool | Add git short SHA as Docker tag (default `false`) |
| `tag-edge` | Bool | Enable edge branch tagging (default `false`) |
| `tag-edge-branch` | String | Branch that will be tagged as edge (default `repo.default_branch`) |
| `tag-match` | String | RegExp to match against a Git tag and use match group as Docker tag |
| `tag-match-latest` | Bool | Set `latest` Docker tag if `tag-match` matches (default `true`) |
| `tag-schedule` | String | [Template](#schedule-tag) to apply to schedule tag (default `nightly`) |
| `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 |
|---------------|---------|---------------------------------------|
| `version` | String | Generated Docker image version |
| `tags` | String | Generated Docker tags |
| `labels` | String | Generated Docker labels |
## Notes
### `tag-match` examples
| Git tag | `tag-match` | Docker tag
|-------------------------|--------------------------------|-------------------|
| `v1.2.3` | `\\d{1,3}.\\d{1,3}.\\d{1,3}` | `1.2.3` |
| `v2.0.8-beta.67` | `\\d{1,3}.\\d{1,3}.\\d{1,3}.*` | `2.0.8-beta.67` |
| `v2.0.8-beta.67` | `\\d{1,3}.\\d{1,3}` | `2.0` |
| `release1` | `\\d{1,3}.\\d{1,3}` | `release1` |
| `20200110-RC2` | `\\d+` | `20200110` |
### 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).
## 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.