$ git clone -n https://src.fedoraproject.org/rpms/python-catkin_tools.git /var/lib/mock/f39-build-1515581-35653/root/chroot_tmpdir/scmroot/python-catkin_tools
Cloning into '/var/lib/mock/f39-build-1515581-35653/root/chroot_tmpdir/scmroot/python-catkin_tools'...
$ git fetch origin b47ece1b55ab3c4eee362fe819eee945e861da26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-catkin_tools
 * [new ref]         b47ece1b55ab3c4eee362fe819eee945e861da26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b47ece1 Update to 0.9.4