$ git clone -n https://src.fedoraproject.org/rpms/marco.git /var/lib/mock/f45-build-18019-507/root/chroot_tmpdir/scmroot/marco
Cloning into '/var/lib/mock/f45-build-18019-507/root/chroot_tmpdir/scmroot/marco'...
$ git fetch origin 1999ab5d9494f8de9c80f8c6f74c3a7dc86ac787:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/marco
 * [new ref]         1999ab5d9494f8de9c80f8c6f74c3a7dc86ac787 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1999ab5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild