$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcontacts.git /var/lib/mock/f42-build-side-1-3510459-46033/root/chroot_tmpdir/scmroot/kf6-kcontacts
Cloning into '/var/lib/mock/f42-build-side-1-3510459-46033/root/chroot_tmpdir/scmroot/kf6-kcontacts'...
$ git fetch origin 2130945b3b0ad16fb2b495d9498bb6be8f9d3272:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcontacts
 * [new ref]         2130945b3b0ad16fb2b495d9498bb6be8f9d3272 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2130945 6.13.0