$ git clone -n https://src.fedoraproject.org/rpms/python-stem.git /var/lib/mock/f45-build-33227-667/root/chroot_tmpdir/scmroot/python-stem
Cloning into '/var/lib/mock/f45-build-33227-667/root/chroot_tmpdir/scmroot/python-stem'...
$ git fetch origin 7df8e33d7767770f2e66ef23293e717340f1e132:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-stem
 * [new ref]         7df8e33d7767770f2e66ef23293e717340f1e132 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7df8e33 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild