$ git clone -n https://src.fedoraproject.org/rpms/rssguard.git /var/lib/mock/f39-build-1586422-38198/root/chroot_tmpdir/scmroot/rssguard
Cloning into '/var/lib/mock/f39-build-1586422-38198/root/chroot_tmpdir/scmroot/rssguard'...
$ git fetch origin 740719a1a34bda77abc976c7bcb8ea3660730820:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rssguard
 * [new ref]         740719a1a34bda77abc976c7bcb8ea3660730820 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 740719a Update to 4.5.1