$ git clone -n https://src.fedoraproject.org/rpms/python-niaarm.git /var/lib/mock/f40-build-2267375-54696/root/chroot_tmpdir/scmroot/python-niaarm
Cloning into '/var/lib/mock/f40-build-2267375-54696/root/chroot_tmpdir/scmroot/python-niaarm'...
$ git fetch origin 51581fa5917f1a3a8585445e2dfabbc9509077ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-niaarm
 * [new ref]         51581fa5917f1a3a8585445e2dfabbc9509077ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51581fa Install additional doc file