$ git clone -n https://src.fedoraproject.org/rpms/gt5.git /var/lib/mock/f41-build-778302-13541/root/chroot_tmpdir/scmroot/gt5
Cloning into '/var/lib/mock/f41-build-778302-13541/root/chroot_tmpdir/scmroot/gt5'...
$ git fetch origin 9fec69821fab79972d8a6fc95f86e828f2b57b15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gt5
 * [new ref]         9fec69821fab79972d8a6fc95f86e828f2b57b15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fec698 Eliminate use of obsolete %patchN syntax (#2283636)