$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-x11.git /var/lib/mock/f42-build-side-1-3578427-46814/root/chroot_tmpdir/scmroot/plasma-workspace-x11
Cloning into '/var/lib/mock/f42-build-side-1-3578427-46814/root/chroot_tmpdir/scmroot/plasma-workspace-x11'...
$ git fetch origin 81e07aae2a9e05dbfd11b4f7ed65563a3ab256d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-x11
 * [new ref]         81e07aae2a9e05dbfd11b4f7ed65563a3ab256d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81e07aa Update to 6.4.1.