Github user holdenk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21669#discussion_r212764246
  
    --- Diff: 
resource-managers/kubernetes/docker/src/main/dockerfiles/spark/Dockerfile ---
    @@ -43,6 +43,10 @@ COPY sbin /opt/spark/sbin
     COPY ${img_path}/spark/entrypoint.sh /opt/
     COPY examples /opt/spark/examples
     COPY data /opt/spark/data
    +RUN if [ -z "$SPARK_USER" ]; then \
    --- End diff --
    
    So this part I _think_ belongs in the entrypoint where you know which user 
your adding because this is done at image build time where we don't know our 
deal.


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