$ git clone -n https://src.fedoraproject.org/rpms/par.git /var/lib/mock/f45-build-21371-584/root/chroot_tmpdir/scmroot/par
Cloning into '/var/lib/mock/f45-build-21371-584/root/chroot_tmpdir/scmroot/par'...
$ git fetch origin f515052abfa9c2b50a5a4de615fb39b99480f19a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/par
 * [new ref]         f515052abfa9c2b50a5a4de615fb39b99480f19a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f515052 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild