$ git clone -n https://src.fedoraproject.org/rpms/perl-Tie-Sub.git /var/lib/mock/f45-build-27147-621/root/chroot_tmpdir/scmroot/perl-Tie-Sub
Cloning into '/var/lib/mock/f45-build-27147-621/root/chroot_tmpdir/scmroot/perl-Tie-Sub'...
$ git fetch origin e607840d3312dd7684f0bfb1c9ad31131b79bd17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tie-Sub
 * [new ref]         e607840d3312dd7684f0bfb1c9ad31131b79bd17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e607840 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild