[jira] [Created] (SPARK-26685) Building Spark Images with latest Docker does not honour spark_uid build argument

["Rob Vesse (JIRA)" <ji...@apache.org>]

Rob Vesse created SPARK-26685:
---------------------------------

             Summary: Building Spark Images with latest Docker does not honour spark_uid build argument
                 Key: SPARK-26685
                 URL: https://issues.apache.org/jira/browse/SPARK-26685
             Project: Spark
          Issue Type: Improvement
          Components: Kubernetes
    Affects Versions: 2.4.0
            Reporter: Rob Vesse


Latest Docker releases are stricter in their interpretation of the scope of build arguments meaning the location of the {{ARG spark_uid}} declaration puts it out of scope by the time the variable is consumed resulting in the Python and R images still running as {{root}} regardless of what the user may have specified as the desired UID.

e.g. Images built with {{-u 456}} provided to {{bin/docker-image-tool.sh}}

{noformat}
> docker run -it --entrypoint /bin/bash rvesse/spark-py:uid456
bash-4.4# whoami
root
bash-4.4# id -u
0
bash-4.4# exit
> docker run -it --entrypoint /bin/bash rvesse/spark:uid456
bash-4.4$ id -u
456
bash-4.4$ exit
{noformat}

Note that for the Python image the build argument was out of scope and ignored.  For the base image the {{ARG}} declaration is in an in-scope location and so is honoured correctly.



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