Docker exist action

This action check if an docker image already exist.

Limitation

This action uses the experimental feature of Docker CLI docker manifest inspect. This feature doesn't work with docker.pkg.github.com registry at the moment.

Inputs

registry

Required Regisry where the image is stored. Default "docker.io".

username

Required Regisry username.

password

Required Regisry password.

image

Required Image name with tag. Example: docker_account/my_image:tag.

Outputs

image_exist

The value 1 if image exist, 0 if the image doesn't exist.

Example usage

jobs:
  job1:
    name: My Job
    runs-on: ubuntu-latest
    steps:
      - name: Check if image exist
        id: is_image_exist
        uses: KerberosMorphy/docker-exist-action@v1.1.1
        with:
          registry: docker.io
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
          image: ${{ secrets.DOCKER_USERNAME }}/my_image:tag
      - name: Publish Image if not exist
        if: ((!steps.is_image_exist.outputs.image_exist))
        # I recommend https://github.com/trilom/file-changes-action
        # if you also want to check if Dockerfile
        # have change since last push.
        uses: docker/build-push-action@v1.1.0
        with:
          name: ${{ secrets.DOCKER_USERNAME }}/my_image
          username: ${{env.DOCKER_USERNAME}}
          password: ${{env.DOCKER_PASSWORD}}
          registry: docker.io