$ git clone -n https://src.fedoraproject.org/rpms/python-cffsubr.git /var/lib/mock/f45-build-29884-641/root/chroot_tmpdir/scmroot/python-cffsubr
Cloning into '/var/lib/mock/f45-build-29884-641/root/chroot_tmpdir/scmroot/python-cffsubr'...
$ git fetch origin 551aaf1c7a22dc9cc6ab688f0bea8b242a75f820:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cffsubr
 * [new ref]         551aaf1c7a22dc9cc6ab688f0bea8b242a75f820 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 551aaf1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild