hybrid wagon
Hey there!
I'm looking to lint my Docker file with hadolint. They provide an already built Docker image that you can run with this command docker run --rm -i hadolint/hadolint < Dockerfile.
I couldn't figure out an easy way to do with the Go SDK.
More info on hadolint here https://github.com/hadolint/hadolint/tree/master/docker.
Much appreciated!
velvet narwhal
👋 Here's one approach. Copy the binary from one container into another one with a shell and you're good to go! Simpler, just mount your host directory with the Dockerfile in it and go! lol
package main
import (
"context"
"os"
"time"
"dagger.io/dagger"
)
func main() {
ctx := context.Background()
client, err := dagger.Connect(ctx, dagger.WithLogOutput(os.Stdout))
if err != nil {
panic(err)
}
// get project dir with Dockerfile inside
src := client.Host().Directory(".")
hadolint := client.
Container().
From("hadolint/hadolint").
WithMountedDirectory("/src", src).
// ensure lint step is not cached (just so we can observe it)
WithEnvVariable("NO_CACHE", time.Now().String()).
WithExec([]string{"/bin/hadolint", "/src/Dockerfile"})
_, err = hadolint.ExitCode(ctx)
if err != nil {
panic(err)
}
}
fading jungle
@velvet narwhal why not just running the hadolint container directly on Dagger? Just thinking why copying the binary is necessary 🤔
velvet narwhal
could have overthought it late last night 😆, so in that case, mount the src to the hadolint container right?
I think the container contains only /bin/hadolint and no entrypoint. Checking with Playground. It's great for this kind of introspection of containers. Yep, that's it. https://play.dagger.cloud/playground/11Vawm2OKtt
Will try.
Ah, yes. Got to work just fine. Lol. Will change example above.