mirror of
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166 lines
6.3 KiB
Markdown
166 lines
6.3 KiB
Markdown
# Docker Hub Description
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[](https://github.com/marketplace/actions/docker-hub-description)
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A GitHub action to update a Docker Hub repository description from `README.md`.
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This is useful if you `docker push` your images to Docker Hub. It provides an easy, automated way to keep your Docker Hub repository description in sync with your GitHub repository `README.md` file.
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## Usage
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```yml
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- uses: actions/checkout@v4
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- name: Docker Hub Description
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uses: peter-evans/dockerhub-description@v4
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_PASSWORD }}
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repository: peterevans/dockerhub-description
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```
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### Action inputs
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| Name | Description | Default |
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| --- | --- | --- |
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| `username` | (**required**) Docker Hub username. If updating a Docker Hub repository belonging to an organization, this user must have `Admin` permissions for the repository. | |
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| `password` | (**required**) Docker Hub password or [Personal Access Token](https://docs.docker.com/docker-hub/access-tokens/) with `read/write/delete` scope. | |
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| `repository` | Docker Hub repository in the format `<namespace>/<name>`. | `github.repository` |
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| `short-description` | Docker Hub repository short description. | |
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| `readme-filepath` | Path to the repository readme. | `./README.md` |
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| `enable-url-completion` | Enables completion of relative URLs to absolute ones. See also [known Issues](#url-completion-known-issues). | `false` |
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| `image-extensions` | File extensions that will be treated as images. | `bmp,gif,jpg,jpeg,png,svg,webp` |
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#### Content limits
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DockerHub has content limits.
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The readme content is limited to 25,000 bytes, and `short-description` is limited to 100 bytes.
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This action truncates content to prevent the request being rejected.
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If the content has been truncated a warning will be issued in the run log.
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#### Specifying the file path
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The action assumes that there is a file called `README.md` located at the root of the repository.
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If this is not the case the path can be specified with the `readme-filepath` input.
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```yml
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- name: Docker Hub Description
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uses: peter-evans/dockerhub-description@v4
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_PASSWORD }}
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repository: peterevans/dockerhub-description
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readme-filepath: ./path/to/README.md
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```
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#### Using the GitHub repository description
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The GitHub repository description can be used for the Docker Hub `short-descripton` by passing the description from the event context.
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```yml
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- name: Docker Hub Description
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uses: peter-evans/dockerhub-description@v4
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_PASSWORD }}
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repository: peterevans/dockerhub-description
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short-description: ${{ github.event.repository.description }}
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```
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### Examples
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The following workflow updates the Docker Hub repository description whenever there are changes to `README.md` and the workflow file itself on the `main` branch. This workflow assumes its location to be `.github/workflows/dockerhub-description.yml`.
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```yml
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name: Update Docker Hub Description
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on:
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push:
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branches:
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- main
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paths:
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- README.md
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- .github/workflows/dockerhub-description.yml
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jobs:
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dockerHubDescription:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Docker Hub Description
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uses: peter-evans/dockerhub-description@v4
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_PASSWORD }}
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repository: peterevans/dockerhub-description
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short-description: ${{ github.event.repository.description }}
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enable-url-completion: true
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```
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Updates the Docker Hub repository description whenever a new release is created.
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```yml
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name: Update Docker Hub Description
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on: release
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jobs:
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dockerHubDescription:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Docker Hub Description
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uses: peter-evans/dockerhub-description@v4
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_PASSWORD }}
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repository: peterevans/dockerhub-description
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short-description: ${{ github.event.repository.description }}
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```
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### URL completion known Issues
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The completion of relative URLs has some known issues:
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1. Relative markdown links in inline-code and code blocks **are also converted**:
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```markdown
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[link in inline code](#table-of-content)
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```
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will be converted into
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```markdown
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[link in inline code](https://github.com/peter-evans/dockerhub-description/blob/main/./README.md#table-of-content)
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```
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2. Links containing square brackets (`]`) in the text fragment **are not converted**:
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```markdown
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[[link text with square brackets]](#table-of-content)
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```
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3. [Reference-style links/images](https://www.markdownguide.org/basic-syntax/#reference-style-links) **are not converted**.
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```markdown
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[table-of-content][toc]
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...
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[toc]: #table-of-content "Table of content"
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```
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## Using the Docker image independently of GitHub Actions
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The image can be executed in other environments independently of GitHub Actions.
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Simply volume mount the location of the `README.md` file to the container and set environment variables as follows.
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```bash
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docker run -v $PWD:/workspace \
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-e DOCKERHUB_USERNAME='user1' \
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-e DOCKERHUB_PASSWORD='xxxxx' \
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-e DOCKERHUB_REPOSITORY='user1/my-docker-image' \
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-e README_FILEPATH='/workspace/README.md' \
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peterevans/dockerhub-description:3
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```
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## License
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[MIT](LICENSE)
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