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Merge pull request #552 from crazy-max/readme
Fix git context subdir example and improve README
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README.md
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README.md
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@ -38,30 +38,7 @@ ___
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## Usage
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By default, this action uses the [Git context](#git-context) so you don't need to use the
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[`actions/checkout`](https://github.com/actions/checkout/) action to checkout the repository because this will be
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done directly by buildkit. The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows)
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and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`.
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You can provide a subdirectory to the [Git context](#git-context) by using the following [Handlebars template](https://handlebarsjs.com/guide/) expression `{{defaultContext}}`:
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```yaml
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-
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name: Build and push
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id: docker_build
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uses: docker/build-push-action@v2
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with:
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context: {{defaultContext}}:docker
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push: true
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tags: user/app:latest
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```
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Be careful because **any file mutation in the steps that precede the build step will be ignored, including processing of the `.dockerignore` file** since
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the context is based on the git reference. However, you can use the [Path context](#path-context) using the
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[`context` input](#inputs) alongside the [`actions/checkout`](https://github.com/actions/checkout/) action to remove
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this restriction.
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In the examples below we are using 3 other actions:
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In the examples below we are also using 3 other actions:
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* [`setup-buildx`](https://github.com/docker/setup-buildx-action) action will create and boot a builder using by
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default the `docker-container` [builder driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver).
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@ -72,6 +49,13 @@ to add emulation support with QEMU to be able to build against more platforms.
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### Git context
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By default, this action uses the [Git context](#git-context) so you don't need
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to use the [`actions/checkout`](https://github.com/actions/checkout/) action to
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check out the repository because this will be done directly by [BuildKit](https://github.com/moby/buildkit).
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The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows)
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and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`.
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```yaml
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name: ci
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@ -98,21 +82,42 @@ jobs:
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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id: docker_build
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uses: docker/build-push-action@v2
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with:
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push: true
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tags: user/app:latest
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```
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Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
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so it does not need to be passed. If you want to authenticate against another private repository, you have to use
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a [secret](docs/advanced/secrets.md) named `GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
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Be careful because **any file mutation in the steps that precede the build step
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will be ignored, including processing of the `.dockerignore` file** since
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the context is based on the Git reference. However, you can use the
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[Path context](#path-context) using the [`context` input](#inputs) alongside
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the [`actions/checkout`](https://github.com/actions/checkout/) action to remove
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this restriction.
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Default Git context can also be provided using the [Handlebars template](https://handlebarsjs.com/guide/)
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expression `{{defaultContext}}`. Here we can use it to provide a subdirectory
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to the default Git context:
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```yaml
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: "{{defaultContext}}:mysubdir"
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push: true
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tags: user/app:latest
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```
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> :warning: Subdirectory for Git context is not yet available for the buildx [`docker` driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver).
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Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
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so it does not need to be passed. If you want to authenticate against another
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private repository, you have to use a [secret](docs/advanced/secrets.md) named
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`GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
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```yaml
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-
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name: Build and push
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id: docker_build
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uses: docker/build-push-action@v2
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with:
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push: true
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@ -217,7 +222,7 @@ Following inputs can be used as `step.with` keys
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| `tags` | List/CSV | List of tags |
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| `target` | String | Sets the target stage to build |
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| `ulimit`¹ | List | [Ulimit](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#-set-ulimits---ulimit) options (e.g., `nofile=1024:1024`) |
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| `github-token` | String | GitHub Token used to authenticate against a repository for Git context (default `${{ github.token }}`) |
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| `github-token` | String | GitHub Token used to authenticate against a repository for [Git context](#git-context) (default `${{ github.token }}`) |
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> ¹ `cgroup-parent`, `shm-size` and `ulimit` are only available using `moby/buildkit:master`
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> as builder image atm:
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@ -1,7 +1,6 @@
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# Handle tags and labels
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If you come from [`v1`](https://github.com/docker/build-push-action/tree/releases/v1#readme) and want an
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"automatic" tag management and [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
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If you want an "automatic" tag management and [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
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for labels, you can do it in a dedicated step. The following workflow will use the [Docker metadata action](https://github.com/docker/metadata-action)
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to handle tags and labels based on GitHub actions events and Git metadata.
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@ -10,7 +9,7 @@ name: ci
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on:
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schedule:
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- cron: '0 10 * * *' # everyday at 10am
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- cron: '0 10 * * *'
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push:
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branches:
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- '**'
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