$ git clone -n https://src.fedoraproject.org/rpms/perl-PAR.git /var/lib/mock/f45-build-25451-611/root/chroot_tmpdir/scmroot/perl-PAR
Cloning into '/var/lib/mock/f45-build-25451-611/root/chroot_tmpdir/scmroot/perl-PAR'...
$ git fetch origin d0a63aa6a97aa2206c33cce4ca46b1ed65af6745:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PAR
 * [new ref]         d0a63aa6a97aa2206c33cce4ca46b1ed65af6745 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0a63aa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild