$ git clone -n https://src.fedoraproject.org/rpms/kf6-kimageformats.git /var/lib/mock/f40-build-787187-134736/root/chroot_tmpdir/scmroot/kf6-kimageformats
Cloning into '/var/lib/mock/f40-build-787187-134736/root/chroot_tmpdir/scmroot/kf6-kimageformats'...
$ git fetch origin 4124b37b84716abd1174670d6d3ac0d7bd023c76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kimageformats
 * [new ref]         4124b37b84716abd1174670d6d3ac0d7bd023c76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4124b37 6.0.0