$ git clone -n https://src.fedoraproject.org/rpms/plasma5support.git /var/lib/mock/f42-build-3426599-45197/root/chroot_tmpdir/scmroot/plasma5support
Cloning into '/var/lib/mock/f42-build-3426599-45197/root/chroot_tmpdir/scmroot/plasma5support'...
$ git fetch origin 64f26de515b68ba43e761f25335df28ef539c931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma5support
 * [new ref]         64f26de515b68ba43e761f25335df28ef539c931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64f26de 6.3.3