javadockerkotlindependabot

Make Docker images versions updatable by Dependabot?

I have a docker image with a specific version in my tests (Java/Kotlin).

I want to make it updatable by Dependabot.

I've seen https://github.com/dependabot/dependabot-core/issues/6893

But I wonder if there is any way to make docker image versions visible for Dependabot.

Solution

  • I've come up with a satisfying workaround:

    Define Dockerfile in /src/test/resources/:

    FROM localstack/localstack:x.y.z

    then, point Dependabot to Dockerfile:

    dependabot.yml:

      - package-ecosystem: docker
    directory: "/src/test/resources/Dockerfile"
    schedule:
      interval: daily

    In tests, I made an utility to get version:

    fun readVersionFromDockerfile() = this.javaClass.getResource("/Dockerfile")!!
  .readText()
  .lines()
  .first()
  .substringAfter(":")
}

    And use the parsed version in tests.