$ git clone -n https://src.fedoraproject.org/rpms/kgamma.git /var/lib/mock/f42-build-3353574-45017/root/chroot_tmpdir/scmroot/kgamma
Cloning into '/var/lib/mock/f42-build-3353574-45017/root/chroot_tmpdir/scmroot/kgamma'...
$ git fetch origin 245ec98be092ed8f6380c08deaa39a3b5f056e44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kgamma
 * [new ref]         245ec98be092ed8f6380c08deaa39a3b5f056e44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 245ec98 6.3.2