$ git clone -n https://src.fedoraproject.org/rpms/python-jaraco-classes.git /var/lib/mock/f45-build-31168-650/root/chroot_tmpdir/scmroot/python-jaraco-classes
Cloning into '/var/lib/mock/f45-build-31168-650/root/chroot_tmpdir/scmroot/python-jaraco-classes'...
$ git fetch origin 31d7fced2ca5b21c4a279d86df2346140152d491:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jaraco-classes
 * [new ref]         31d7fced2ca5b21c4a279d86df2346140152d491 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31d7fce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild