$ git clone -n https://src.fedoraproject.org/rpms/python-catkin_pkg.git /var/lib/mock/f45-build-29879-641/root/chroot_tmpdir/scmroot/python-catkin_pkg
Cloning into '/var/lib/mock/f45-build-29879-641/root/chroot_tmpdir/scmroot/python-catkin_pkg'...
$ git fetch origin 85b6d88c5db47945f5ee870b7bfd6711d9dd39cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-catkin_pkg
 * [new ref]         85b6d88c5db47945f5ee870b7bfd6711d9dd39cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85b6d88 Update to 1.1.1