$ git clone -n https://src.fedoraproject.org/rpms/python-pg8000.git /var/lib/mock/f45-build-31891-656/root/chroot_tmpdir/scmroot/python-pg8000
Cloning into '/var/lib/mock/f45-build-31891-656/root/chroot_tmpdir/scmroot/python-pg8000'...
$ git fetch origin 66ffbbca3f5bfb53d19e2ea5420406574c46edd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pg8000
 * [new ref]         66ffbbca3f5bfb53d19e2ea5420406574c46edd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66ffbbc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild