Configuring a base image built earlier in the Gradle build

I’d like to use a base image for Jib that was built (via a normal Dockerfile) earlier in the Gradle build. (This lets me use a base OS and JDK of my choosing with project-specific other things that aren’t easily done by simply copying files from the project via jib’s extraDirectories.)

The image is built like this using https://bmuschko.github.io/gradle-docker-plugin/:

task buildBaseDockerImg(type: DockerBuildImage) {
    inputDir = file("$rootProject.projectDir/docker")
}

I can get the sha256:... string for the image with another task:

task inspect(type: DockerInspectImage) {
    dependsOn buildBaseDockerImg

    targetImageId buildBaseDockerImg.imageId

    onNext { image ->
        // the sha256:.. is at `image.config.image`
    }
}

However, in the onNext closure seems to be too late to configure the jib extension to use the sha256:.... Is there a way to do this?

Note: even when I configure the jib extension with something like

jib {
    from {
        image = 'sha256:...'
    }

it still seems to be trying to pull that from a repository, which of course doesn’t work since I didn’t push it anywhere. Does jib only know how to use base images that it pulls from a repo?

[loosebazooka]

@marshallpierce to clarify, what I mean is doing something like this in your build.gradle and using that uuidTag everywhere

def uuidTag = UUID.randomUUID().toString()
println uuidTag

[loosebazooka]

Gotcha. I’ll go ahead and close this for now. Please open a new bug if you’re having trouble further optimizing your build with jib.