$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcontacts.git /var/lib/mock/f41-build-860967-169299/root/chroot_tmpdir/scmroot/kf6-kcontacts
Cloning into '/var/lib/mock/f41-build-860967-169299/root/chroot_tmpdir/scmroot/kf6-kcontacts'...
$ git fetch origin 642423f9d66352a15d85abaf0b3de9e1e4a78b02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcontacts
 * [new ref]         642423f9d66352a15d85abaf0b3de9e1e4a78b02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 642423f 6.8.0