$ git clone -n https://src.fedoraproject.org/rpms/python-pbr.git /var/lib/mock/f45-build-31981-656/root/chroot_tmpdir/scmroot/python-pbr
Cloning into '/var/lib/mock/f45-build-31981-656/root/chroot_tmpdir/scmroot/python-pbr'...
$ git fetch origin 2934c13ea5e4df4bdd012e65a608018ff27ea161:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pbr
 * [new ref]         2934c13ea5e4df4bdd012e65a608018ff27ea161 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2934c13 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild