Add tags handling example

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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CrazyMax 2020-09-10 22:24:13 +02:00
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@ -24,6 +24,7 @@ ___
* [Multi-platform image](#multi-platform-image)
* [Local registry](#local-registry)
* [Leverage GitHub cache](#leverage-github-cache)
* [Tags handling](#tags-handling)
* [Complete workflow](#complete-workflow)
* [Update DockerHub repo description](#update-dockerhub-repo-description)
* [Customizing](#customizing)
@ -297,6 +298,81 @@ jobs:
cache-to: type=local,dest=/tmp/.buildx-cache
```
### Tags handling
If you come from [`v1`](https://github.com/docker/build-push-action/tree/releases/v1#readme) and you want an
"automatic" tag management through Git reference, you will have to do it in a dedicated step [for now](https://github.com/docker/build-push-action/issues/116).
The workflow below with the `Prepare` step will generate a
[`tags` output](https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjobs_idoutputs):
* On `pull_request` event with `refs/pull/2/merge` ref and `a123b57` sha:
* `user/app:pr-2`
* On `push` event with `refs/heads/master` ref and `676cae2` sha:
* `user/app:sha-676cae2`
* `user/app:edge`
* On `push` event with `refs/heads/dev` ref and `cf20257` sha:
* `user/app:sha-cf20257`
* `user/app:dev`
* On `push tags` event with `refs/tags/v1.2.3` ref and `9258794` sha:
* `user/app:sha-9258794`
* `user/app:v1.2.3`
* `user/app:v1.2`
* `user/app:v1`
* `user/app:latest`
```yaml
name: ci
on:
push:
branches: master
tags:
- 'v*.*.*'
pull_request:
branches: master
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Prepare
id: prep
run: |
DOCKER_IMAGE=name/app
VERSION=edge
if [[ $GITHUB_REF == refs/tags/* ]]; then
VERSION=${GITHUB_REF#refs/tags/}
fi
if [ "${{ github.event_name }}" = "pull_request" ]; then
TAGS="${DOCKER_IMAGE}:pr-${{ github.event.number }}"
else
TAGS="${DOCKER_IMAGE}:${VERSION}"
TAGS="${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
fi
if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
MINOR=${VERSION%.*}
MAJOR=${MINOR%.*}
TAGS="$TAGS,${DOCKER_IMAGE}:${MINOR},${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:latest"
fi
echo ::set-output name=tags::${TAGS}
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
tags: ${{ steps.prep.outputs.tags }}
```
### Complete workflow
* On `pull_request` event, Docker image `name/app:edge` is **built**.
@ -331,13 +407,13 @@ jobs:
DOCKER_IMAGE=name/app
VERSION=edge
if [[ $GITHUB_REF == refs/tags/* ]]; then
VERSION=${GITHUB_REF#refs/tags/v}
VERSION=${GITHUB_REF#refs/tags/}
fi
if [ "${{ github.event_name }}" = "schedule" ]; then
VERSION=nightly
fi
TAGS="${DOCKER_IMAGE}:${VERSION}"
if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
TAGS="$TAGS,${DOCKER_IMAGE}:latest"
fi
echo ::set-output name=tags::${TAGS}
@ -356,7 +432,6 @@ jobs:
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
context: .