$ git clone -n https://src.fedoraproject.org/rpms/gr-rds.git /var/lib/mock/f41-build-858592-168464/root/chroot_tmpdir/scmroot/gr-rds
Cloning into '/var/lib/mock/f41-build-858592-168464/root/chroot_tmpdir/scmroot/gr-rds'...
$ git fetch origin b284f4ceae2dbceaf648f730e84091a516963ab5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gr-rds
 * [new ref]         b284f4ceae2dbceaf648f730e84091a516963ab5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b284f4c Rebuilt for new gnuradio