$ git clone -n https://src.fedoraproject.org/rpms/NiaAML-GUI.git /var/lib/mock/f40-build-1930433-25111/root/chroot_tmpdir/scmroot/NiaAML-GUI
Cloning into '/var/lib/mock/f40-build-1930433-25111/root/chroot_tmpdir/scmroot/NiaAML-GUI'...
$ git fetch origin 5b3017556650546fb59601a2de1f96e5eadf57a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/NiaAML-GUI
 * [new ref]         5b3017556650546fb59601a2de1f96e5eadf57a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b30175 Update to 0.3.1 (close RHBZ#2284186)