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docker-metadata/README.md
CrazyMax c53f88523a
Fix README
2020-11-24 14:12:22 +01:00

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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)
* [Usage](#usage)
* [Basic](#basic)
* [Semver](#semver)
* [Complete](#complete)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [Notes](#notes)
* [Latest tag](#latest-tag)
* [Handle semver tag](#handle-semver-tag)
* [`tag-match` examples](#tag-match-examples)
* [Schedule tag](#schedule-tag)
* [Overwrite labels](#overwrite-labels)
* [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
## Usage
### Basic
| Event | Ref | Commit SHA | Docker Tags |
|-----------------|-------------------------------|------------|-------------------------------------|
| `pull_request` | `refs/pull/2/merge` | `a123b57` | `pr-2` |
| `push` | `refs/heads/master` | `cf20257` | `master` |
| `push` | `refs/heads/my/branch` | `a5df687` | `my-branch` |
| `push tag` | `refs/tags/v1.2.3` | `ad132f5` | `v1.2.3`, `latest` |
| `push tag` | `refs/tags/v2.0.8-beta.67` | `fc89efd` | `v2.0.8-beta.67`, `latest` |
```yaml
name: ci
on:
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
-
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 }}
```
### Semver
| Event | Ref | Commit SHA | Docker Tags |
|-----------------|-------------------------------|------------|-------------------------------------|
| `pull_request` | `refs/pull/2/merge` | `a123b57` | `pr-2` |
| `push` | `refs/heads/master` | `cf20257` | `master` |
| `push` | `refs/heads/my/branch` | `a5df687` | `my-branch` |
| `push tag` | `refs/tags/v1.2.3` | `ad132f5` | `1.2.3`, `1.2`, `latest` |
| `push tag` | `refs/tags/v2.0.8-beta.67` | `fc89efd` | `2.0.8-beta.67` |
```yaml
name: ci
on:
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-semver: |
{{version}}
{{major}}.{{minor}}
-
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 }}
```
### Complete
| 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/master` | `cf20257` | `sha-cf20257`, `master` |
| `push` | `refs/heads/my/branch` | `a5df687` | `sha-a5df687`, `my-branch` |
| `push tag` | `refs/tags/v1.2.3` | `ad132f5` | `sha-ad132f5`, `1.2.3`, `1.2`, `latest` |
| `push tag` | `refs/tags/v2.0.8-beta.67` | `fc89efd` | `sha-fc89efd`, `2.0.8-beta.67` |
```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-semver: |
{{version}}
{{major}}.{{minor}}
-
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-semver` | List | Handle Git tag as semver [template](#handle-semver-tag) if possible |
| `tag-match` | String | RegExp to match against a Git tag and use first match as Docker tag |
| `tag-match-group` | Number | Group to get if `tag-match` matches (default `0`) |
| `tag-match-latest` | Bool | Set `latest` Docker tag if `tag-match` matches or on Git tag event (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
> `tag-semver` and `tag-match` are mutually exclusive
### 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
### Latest tag
Latest Docker tag will be generated by default on `push tag` event. If for example you push the `v1.2.3` Git tag,
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
generated only if `tag-semver` is a valid [semver](https://semver.org/) or if Git tag matches a regular expression
with the [`tag-match` input](#tag-match-examples).
### Handle semver tag
If Git tag is a valid [semver](https://semver.org/) you can handle it to output multi Docker tags at once.
`tag-semver` supports multi-line [Handlebars template](https://handlebarsjs.com/guide/) with the following inputs:
| Git tag | `tag-semver` | Valid | Output tags | Output version |
|--------------------|----------------------------------------------------------|--------------------|----------------------------|------------------------------|
| `v1.2.3` | `{{raw}}` | :white_check_mark: | `v1.2.3`, `latest` | `v1.2.3` |
| `v1.2.3` | `{{version}}` | :white_check_mark: | `1.2.3`, `latest` | `1.2.3` |
| `v1.2.3` | `{{major}}.{{minor}}` | :white_check_mark: | `1.2`, `latest` | `1.2` |
| `v1.2.3` | `v{{major}}` | :white_check_mark: | `v1`, `latest` | `v1` |
| `v1.2.3` | `{{minor}}` | :white_check_mark: | `2`, `latest` | `2` |
| `v1.2.3` | `{{patch}}` | :white_check_mark: | `3`, `latest` | `3` |
| `v1.2.3` | `{{major}}.{{minor}}`<br>`{{major}}.{{minor}}.{{patch}}` | :white_check_mark: | `1.2`, `1.2.3`, `latest` | `1.2`* |
| `v2.0.8-beta.67` | `{{raw}}` | :white_check_mark: | `2.0.8-beta.67`** | `2.0.8-beta.67` |
| `v2.0.8-beta.67` | `{{version}}` | :white_check_mark: | `2.0.8-beta.67` | `2.0.8-beta.67` |
| `v2.0.8-beta.67` | `{{major}}.{{minor}}` | :white_check_mark: | `2.0.8-beta.67`** | `2.0.8-beta.67` |
| `release1` | `{{raw}}` | :x: | `release1` | `release1` |
> *First occurrence of `tag-semver` will be taken as `output.version`
> **Pre-release (rc, beta, alpha) will only extend `{{version}}` 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.
### `tag-match` examples
| Git tag | `tag-match` | `tag-match-group` | Match | Output tags | Output version |
|-------------------------|------------------------------------|-------------------|----------------------|---------------------------|------------------------------|
| `v1.2.3` | `\d{1,3}.\d{1,3}.\d{1,3}` | `0` | :white_check_mark: | `1.2.3`, `latest` | `1.2.3` |
| `v2.0.8-beta.67` | `v(.*)` | `1` | :white_check_mark: | `2.0.8-beta.67`, `latest` | `2.0.8-beta.67` |
| `v2.0.8-beta.67` | `v(\d.\d)` | `1` | :white_check_mark: | `2.0`, `latest` | `2.0` |
| `release1` | `\d{1,3}.\d{1,3}` | `0` | :x: | `release1` | `release1` |
| `20200110-RC2` | `\d+` | `0` | :white_check_mark: | `20200110`, `latest` | `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).
### 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: 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 }}
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"
```
## 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.
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