$ git clone -n https://src.fedoraproject.org/rpms/libheinz.git /var/lib/mock/f45-build-16310-485/root/chroot_tmpdir/scmroot/libheinz
Cloning into '/var/lib/mock/f45-build-16310-485/root/chroot_tmpdir/scmroot/libheinz'...
$ git fetch origin e3da93a8f027d1873910f7c8b9b9c434c1f522b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libheinz
 * [new ref]         e3da93a8f027d1873910f7c8b9b9c434c1f522b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3da93a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild