Add squash option to podman commit

[pbrezina]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind feature

Description

Please, add --squash option to podman commit so the new image does not create a new layer but is instead squashed to the latest layer.

[baude]

at @vrothberg wdyt?

[vrothberg]

Thanks for the proposal, @pbrezina!

I think it's fairly easy to get done since the backend in Buildah already supports squashing on commit. What had to be done is to extend the Podman CLI with a --squash flag and do the plumbing down to when committing the container (i.e., https://github.com/containers/podman/blob/main/libpod/container_commit.go#L63).

@ncrowe2000, that would a cool project to work on when you find time.

[pbrezina]

Thank you for looking into it. To explain the use case - I want to setup some applications that requires systemd and a specific hostname (FreeIPA precisely), which is currently not possible to do during build time. But I also want to trim down unneeded layer to reduce size of the resulting image.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@flouthoc PTAL

[flouthoc]

ackd. I'll take a look.

[flouthoc]

Above PR should close this.