dockerhub-description/README.md

# Docker Hub Description
[![GitHub Marketplace](https://img.shields.io/badge/Marketplace-Docker%20Hub%20Description-blue.svg?colorA=24292e&colorB=0366d6&style=flat&longCache=true&logo=data:image/png;base64,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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`.

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.

## Usage

```yml
    - name: Docker Hub Description
      uses: peter-evans/dockerhub-description@v1.0.1
      env:
        DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
        DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
        DOCKERHUB_REPOSITORY: peterevans/dockerhub-description
```

#### Required environment variables

- `DOCKERHUB_USERNAME` - Docker Hub username
- `DOCKERHUB_PASSWORD` - Docker Hub password
- `DOCKERHUB_REPOSITORY` - The Docker Hub repository to update in the format `<namespace>/<name>`

Note that `DOCKERHUB_REPOSITORY` may also be passed as a secret if considered sensitive.

#### Optionally specifying the file path

The action assumes that there is a file called `README.md` located at the root of the repository.
If this is not the case, the path can be overridden with an environment variable.

```yml
    - name: Docker Hub Description
      uses: peter-evans/dockerhub-description@v1.0.1
      env:
        DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
        DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
        DOCKERHUB_REPOSITORY: peterevans/dockerhub-description
        README_FILEPATH: ./some-path/README.md
```

#### Examples

Updates the Docker Hub repository description whenever there is a `git push` to the `master` branch.
```yml
name: Update Docker Hub Description
on:
  push:
    branches:
    - master
jobs:
  dockerHubDescription:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Docker Hub Description
      uses: peter-evans/dockerhub-description@v1.0.1
      env:
        DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
        DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
        DOCKERHUB_REPOSITORY: peterevans/dockerhub-description
```

Updates the Docker Hub repository description whenever a new release is created.
```yml
name: Update Docker Hub Description
on: release
jobs:
  dockerHubDescription:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Docker Hub Description
      uses: peter-evans/dockerhub-description@v1.0.1
      env:
        DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
        DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
        DOCKERHUB_REPOSITORY: peterevans/dockerhub-description
```

## Using the Docker image independently of GitHub Actions

The image can be executed in other environments independently of GitHub Actions.
Simply volume mount the location of the `README.md` file to the container and set environment variables as follows.

```bash
docker run -v $PWD:/workspace \
  -e DOCKERHUB_USERNAME='user1' \
  -e DOCKERHUB_PASSWORD='xxxxx' \
  -e DOCKERHUB_REPOSITORY='user1/my-docker-image' \
  -e README_FILEPATH='/workspace/README.md' \
  peterevans/dockerhub-description:1.0.1
```

## License

MIT License - see the [LICENSE](LICENSE) file for details