$ git clone -n https://src.fedoraproject.org/rpms/perl-Algorithm-LUHN.git /var/lib/mock/f45-build-21629-587/root/chroot_tmpdir/scmroot/perl-Algorithm-LUHN
Cloning into '/var/lib/mock/f45-build-21629-587/root/chroot_tmpdir/scmroot/perl-Algorithm-LUHN'...
$ git fetch origin 6dd1678e8339b8526f01c77bfd90385e9e273803:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Algorithm-LUHN
 * [new ref]         6dd1678e8339b8526f01c77bfd90385e9e273803 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dd1678 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild