build-push-action/README.md
CrazyMax 86856eb412
Expose Git secret token if default context used
Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
2020-09-22 20:49:18 +02:00

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[![GitHub release](https://img.shields.io/github/release/docker/build-push-action.svg?style=flat-square)](https://github.com/docker/build-push-action/releases/latest)
[![GitHub marketplace](https://img.shields.io/badge/marketplace-build--and--push--docker--images-blue?logo=github&style=flat-square)](https://github.com/marketplace/actions/build-and-push-docker-images)
[![CI workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/ci?label=ci&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=ci)
[![Test workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/test?label=test&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=test)
[![Codecov](https://img.shields.io/codecov/c/github/docker/build-push-action?logo=codecov&style=flat-square)](https://codecov.io/gh/docker/build-push-action)
## About
GitHub Action to build and push Docker images with [Buildx](https://github.com/docker/buildx).
> :bulb: See also:
> * [login](https://github.com/docker/login-action) action
> * [setup-buildx](https://github.com/docker/setup-buildx-action) action
> * [setup-qemu](https://github.com/docker/setup-qemu-action) action
![Screenshot](.github/build-push-action.png)
___
* [Usage](#usage)
* [Git context](#git-context)
* [Path context](#path-context)
* [Isolated builders](#isolated-builders)
* [Multi-platform image](#multi-platform-image)
* [Advanced usage](#advanced-usage)
* [Local registry](#local-registry)
* [Leverage GitHub cache](#leverage-github-cache)
* [Complete workflow](#complete-workflow)
* [Update DockerHub repo description](#update-dockerhub-repo-description)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [Troubleshooting](#troubleshooting)
* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
* [Limitation](#limitation)
## Usage
This action uses our [setup-buildx](https://github.com/docker/setup-buildx-action) action that extends the
`docker build` command named [buildx](https://github.com/docker/buildx) with the full support of the features
provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkit. This includes multi-arch build,
build-secrets, remote cache, etc. and different builder deployment/namespacing options.
### Git context
The default behavior of this action is to use the [Git context invoked by your workflow](https://github.com/docker/build-push-action/blob/master/src/context.ts#L35).
```yaml
name: ci
on:
push:
branches: master
jobs:
main:
runs-on: ubuntu-latest
steps:
-
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
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
-
name: Image digest
run: echo ${{ steps.docker_build.outputs.digest }}
```
If you want to authenticate against a private repository, you have to use a secret named `GIT_AUTH_TOKEN` to be able
to authenticate against it with buildx:
```yaml
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
secrets: |
GIT_AUTH_TOKEN=${{ secrets.MYTOKEN }}
```
> :warning: Subdir for Git context is [not yet supported](https://github.com/docker/build-push-action/issues/120).
> For the moment you can use the [path context](#path-context).
### Path context
You can also use the `PATH` context alongside the [`actions/checkout`](https://github.com/actions/checkout/) action.
```yaml
name: ci
on:
push:
branches: master
jobs:
path-context:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
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
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: true
tags: user/app:latest
```
### Isolated builders
```yaml
name: ci
on:
push:
branches: master
jobs:
multi-builders:
runs-on: ubuntu-latest
steps:
-
uses: docker/setup-buildx-action@v1
id: builder1
-
uses: docker/setup-buildx-action@v1
id: builder2
-
name: Builder 1 name
run: echo ${{ steps.builder1.outputs.name }}
-
name: Builder 2 name
run: echo ${{ steps.builder2.outputs.name }}
-
name: Build against builder1
uses: docker/build-push-action@v2
with:
builder: ${{ steps.builder1.outputs.name }}
target: mytarget1
-
name: Build against builder2
uses: docker/build-push-action@v2
with:
builder: ${{ steps.builder2.outputs.name }}
target: mytarget2
```
### Multi-platform image
```yaml
name: ci
on:
push:
branches: master
jobs:
multi:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
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
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/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
push: true
tags: |
user/app:latest
user/app:1.0.0
```
## Advanced usage
### Local registry
For testing purposes you may need to create a [local registry](https://hub.docker.com/_/registry) to push images into:
<details>
<summary><b>Show workflow</b></summary>
```yaml
name: ci
on:
push:
branches: master
jobs:
local-registry:
runs-on: ubuntu-latest
services:
registry:
image: registry:2
ports:
- 5000:5000
steps:
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
with:
driver-opts: network=host
-
name: Build and push to local registry
uses: docker/build-push-action@v2
with:
push: true
tags: localhost:5000/name/app:latest
-
name: Inspect
run: |
docker buildx imagetools inspect localhost:5000/name/app:latest
```
</details>
### Leverage GitHub cache
You can leverage [GitHub cache](https://docs.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows)
using [actions/cache](https://github.com/actions/cache) with this action:
<details>
<summary><b>Show workflow</b></summary>
```yaml
name: ci
on:
push:
branches: master
jobs:
github-cache:
runs-on: ubuntu-latest
steps:
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Cache Docker layers
uses: actions/cache@v2
with:
path: /tmp/.buildx-cache
key: ${{ runner.os }}-buildx-${{ github.sha }}
restore-keys: |
${{ runner.os }}-buildx-
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
cache-from: type=local,src=/tmp/.buildx-cache
cache-to: type=local,dest=/tmp/.buildx-cache
```
</details>
### Complete workflow
If you come from [`v1`](https://github.com/docker/build-push-action/tree/releases/v1#readme) and you want an
"automatic" tag management through Git reference and [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
for labels, you will have to do it in a dedicated step [for now](https://github.com/docker/build-push-action/issues/116).
The following workflow with the `Prepare` step will generate some [outputs](https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjobs_idoutputs)
to handle tags and labels based on GitHub actions events. This is just an example to show many cases that you
might want to use:
<details>
<summary><b>Show workflow</b></summary>
```yaml
name: ci
on:
schedule:
- cron: '0 10 * * *' # everyday at 10am
push:
branches:
- '**'
tags:
- 'v*.*.*'
pull_request:
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Prepare
id: prep
run: |
DOCKER_IMAGE=name/app
VERSION=noop
if [ "${{ github.event_name }}" = "schedule" ]; then
VERSION=nightly
elif [[ $GITHUB_REF == refs/tags/* ]]; then
VERSION=${GITHUB_REF#refs/tags/}
elif [[ $GITHUB_REF == refs/heads/* ]]; then
VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
if [ "${{ github.event.repository.default_branch }}" = "$VERSION" ]; then
VERSION=edge
fi
elif [[ $GITHUB_REF == refs/pull/* ]]; then
VERSION=pr-${{ github.event.number }}
fi
TAGS="${DOCKER_IMAGE}:${VERSION}"
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"
elif [ "${{ github.event_name }}" = "push" ]; then
TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
fi
echo ::set-output name=version::${VERSION}
echo ::set-output name=tags::${TAGS}
echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
-
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
id: docker_build
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/amd64,linux/arm64,linux/386
push: ${{ github.event_name != 'pull_request' }}
tags: ${{ steps.prep.outputs.tags }}
labels: |
org.opencontainers.image.title=${{ github.event.repository.name }}
org.opencontainers.image.description=${{ github.event.repository.description }}
org.opencontainers.image.url=${{ github.event.repository.html_url }}
org.opencontainers.image.source=${{ github.event.repository.clone_url }}
org.opencontainers.image.version=${{ steps.prep.outputs.version }}
org.opencontainers.image.created=${{ steps.prep.outputs.created }}
org.opencontainers.image.revision=${{ github.sha }}
org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
```
</details>
| Event | Ref | Commit SHA | Docker Tag | Pushed |
|-----------------|-------------------------------|------------|------------------------------------|--------|
| `schedule` | | | `nightly` | Yes |
| `pull_request` | `refs/pull/2/merge` | `a123b57` | `pr-2` | No |
| `push` | `refs/heads/<default_branch>` | `676cae2` | `sha-676cae2`, `edge` | Yes |
| `push` | `refs/heads/dev` | `cf20257` | `sha-cf20257`, `dev` | Yes |
| `push` | `refs/heads/my/branch` | `a5df687` | `sha-a5df687`, `my-branch` | Yes |
| `push tag` | `refs/tags/v1.2.3` | | `v1.2.3`, `v1.2`, `v1`, `latest` | Yes |
### Update DockerHub repo description
You can update the [Docker Hub repository description](https://docs.docker.com/docker-hub/repos/) using
a third-party action called [Docker Hub Description](https://github.com/peter-evans/dockerhub-description)
with this action:
<details>
<summary><b>Show workflow</b></summary>
```yaml
name: ci
on:
push:
branches: master
jobs:
main:
runs-on: ubuntu-latest
steps:
-
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
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:
push: true
tags: user/app:latest
-
name: Update repo description
uses: peter-evans/dockerhub-description@v2
env:
DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
DOCKERHUB_REPOSITORY: user/app
```
</details>
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Description |
|---------------------|---------|------------------------------------|
| `builder` | String | Builder instance (see [setup-buildx](https://github.com/docker/setup-buildx-action) action) |
| `context` | String | Build's context is the set of files located in the specified [`PATH` or `URL`](https://docs.docker.com/engine/reference/commandline/build/) (default [Git context](#git-context)) |
| `file` | String | Path to the Dockerfile (default `Dockerfile`) |
| `build-args` | List | List of build-time variables |
| `labels` | List | List of metadata for an image |
| `tags` | List | List of tags |
| `pull` | Bool | Always attempt to pull a newer version of the image (default `false`) |
| `target` | String | Sets the target stage to build |
| `allow` | List | List of [extra privileged entitlement](https://github.com/docker/buildx#--allowentitlement) (eg. `network.host,security.insecure`) |
| `no-cache` | Bool | Do not use cache when building the image (default `false`) |
| `platforms` | List | List of [target platforms](https://github.com/docker/buildx#---platformvaluevalue) for build |
| `load` | Bool | [Load](https://github.com/docker/buildx#--load) is a shorthand for `--output=type=docker` (default `false`) |
| `push` | Bool | [Push](https://github.com/docker/buildx#--push) is a shorthand for `--output=type=registry` (default `false`) |
| `outputs` | CSV | List of [output destinations](https://github.com/docker/buildx#-o---outputpath-typetypekeyvalue) (format: `type=local,dest=path`) |
| `cache-from` | CSV | List of [external cache sources](https://github.com/docker/buildx#--cache-fromnametypetypekeyvalue) (eg. `type=local,src=path/to/dir`) |
| `cache-to` | CSV | List of [cache export destinations](https://github.com/docker/buildx#--cache-tonametypetypekeyvalue) (eg. `type=local,dest=path/to/dir`) |
| `secrets` | CSV | List of secrets to expose to the build (eg. `key=value`, `GIT_AUTH_TOKEN=mytoken`) |
> `List` type can be a comma or newline-delimited string
> ```yaml
> tags: name/app:latest,name/app:1.0.0
> ```
> ```yaml
> tags: |
> name/app:latest
> name/app:1.0.0
> ```
> `CSV` type must be a newline-delimited string
> ```yaml
> cache-from: user/app:cache
> ```
> ```yaml
> cache-from: |
> user/app:cache
> type=local,src=path/to/dir
> ```
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
| `digest` | String | Image content-addressable identifier also called a digest |
## Troubleshooting
See [TROUBLESHOOTING.md](TROUBLESHOOTING.md)
## 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"
```
## Limitation
This action is only available for Linux [virtual environments](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).