Detect unused BuildRequires

[xsuchy]

Just a heads up that there is a new project
https://github.com/mkoncek/unbreq
that detects unused buildrequires. So far it is functional prototype.

Once it is fully functional and mature we may link to that from our documentation. Or maybe even merge to this repo.

[mkoncek]

The project just reached another milestone (replacing subprocess calls with librpm / libdnf native calls).
I added a Copr repo with the latest build: https://copr.fedorainfracloud.org/coprs/mkoncek/unbreq/.
There are still some unsolved issues:

• chroot / nspawn handling should be done using mock's internal util helpers, i tried to use them but it didn't work for me
• Proper isolation - this should be fixable when the plugin is packaged and available to install as a regular package during package builds:
  • fanotify binary should be installed into the buildroot and ran via chroot / nspawn so that it's filesystem visibility is limited to only buildroot
  • resolve binary should be installed into the bootstrap root and ran with chroot / nspawn with bind-mounted buildroot (used as dnf --installroot / rpm --root)

[praiskup]

Nice, what an attractive topic!

The project just reached another milestone (replacing subprocess calls with librpm / libdnf native calls).

Mock moves towards the future shape where RPM/DNF is not needed on host; it would mean that you have to call librpm and libdnf from bootstrap chroot when working with build chroot.

chroot / nspawn handling should be done using mock's internal util helpers, i tried to use them but it didn't work for me

I can help with this, I bet.