$ git clone -n https://src.fedoraproject.org/rpms/libisofs.git /var/lib/mock/f45-build-16410-486/root/chroot_tmpdir/scmroot/libisofs
Cloning into '/var/lib/mock/f45-build-16410-486/root/chroot_tmpdir/scmroot/libisofs'...
$ git fetch origin 4eaaf76066c5f5317b5ae260a0389745ad815bbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libisofs
 * [new ref]         4eaaf76066c5f5317b5ae260a0389745ad815bbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4eaaf76 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild