$ git clone -n https://src.fedoraproject.org/rpms/pisg.git /var/lib/mock/f45-build-28531-631/root/chroot_tmpdir/scmroot/pisg
Cloning into '/var/lib/mock/f45-build-28531-631/root/chroot_tmpdir/scmroot/pisg'...
$ git fetch origin 7339121fc3a887da6ba8b5dc8f3d37f4297a493c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pisg
 * [new ref]         7339121fc3a887da6ba8b5dc8f3d37f4297a493c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7339121 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild