$ git clone -n https://src.fedoraproject.org/rpms/perl-Parallel-Prefork.git /var/lib/mock/f45-build-25609-612/root/chroot_tmpdir/scmroot/perl-Parallel-Prefork
Cloning into '/var/lib/mock/f45-build-25609-612/root/chroot_tmpdir/scmroot/perl-Parallel-Prefork'...
$ git fetch origin d7952e08bbeb13281d2b0c60512ac61b403ca686:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Parallel-Prefork
 * [new ref]         d7952e08bbeb13281d2b0c60512ac61b403ca686 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7952e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild