$ git clone -n https://src.fedoraproject.org/rpms/obs-studio.git /var/lib/mock/f39-build-2461217-61441/root/chroot_tmpdir/scmroot/obs-studio
Cloning into '/var/lib/mock/f39-build-2461217-61441/root/chroot_tmpdir/scmroot/obs-studio'...
$ git fetch origin 11baf31c516d90f09402ba4101503a4da78a2a55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-studio
 * [new ref]         11baf31c516d90f09402ba4101503a4da78a2a55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11baf31 Rebuild (qt6)