$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-x11.git /var/lib/mock/f40-build-788688-135303/root/chroot_tmpdir/scmroot/plasma-workspace-x11
Cloning into '/var/lib/mock/f40-build-788688-135303/root/chroot_tmpdir/scmroot/plasma-workspace-x11'...
$ git fetch origin eef5d62a8814f42198834474e119f830c7e4cf03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-x11
 * [new ref]         eef5d62a8814f42198834474e119f830c7e4cf03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eef5d62 Update to 6.0.0.