$ git clone -n https://src.fedoraproject.org/rpms/plasma5support.git /var/lib/mock/f40-build-2476598-61589/root/chroot_tmpdir/scmroot/plasma5support
Cloning into '/var/lib/mock/f40-build-2476598-61589/root/chroot_tmpdir/scmroot/plasma5support'...
$ git fetch origin cc0d991929572b44d394d54555866d9d0bbb7750:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma5support
 * [new ref]         cc0d991929572b44d394d54555866d9d0bbb7750 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc0d991 6.0.0