$ git clone -n https://src.fedoraproject.org/rpms/chmlib.git /var/lib/mock/f45-build-4636-333/root/chroot_tmpdir/scmroot/chmlib
Cloning into '/var/lib/mock/f45-build-4636-333/root/chroot_tmpdir/scmroot/chmlib'...
$ git fetch origin c2b051b5eeab715de732b1ac93f9c6bfea027a54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chmlib
 * [new ref]         c2b051b5eeab715de732b1ac93f9c6bfea027a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2b051b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild