$ git clone -n https://src.fedoraproject.org/rpms/python-beaker.git /var/lib/mock/f45-build-29734-640/root/chroot_tmpdir/scmroot/python-beaker
Cloning into '/var/lib/mock/f45-build-29734-640/root/chroot_tmpdir/scmroot/python-beaker'...
$ git fetch origin e46ae40910bb5c6c24ec4ba464f1076ecd242c91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-beaker
 * [new ref]         e46ae40910bb5c6c24ec4ba464f1076ecd242c91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e46ae40 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild