$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-x11.git /var/lib/mock/f42-build-side-1-3566278-46733/root/chroot_tmpdir/scmroot/plasma-workspace-x11
Cloning into '/var/lib/mock/f42-build-side-1-3566278-46733/root/chroot_tmpdir/scmroot/plasma-workspace-x11'...
$ git fetch origin 29ffa77531bae1cbcb5ce00d5608ba3dae5773d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-x11
 * [new ref]         29ffa77531bae1cbcb5ce00d5608ba3dae5773d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29ffa77 Update to 6.4.0.