Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/125#issuecomment-37736072
@ScrapCodes this is a good start but right now it doesn't actually fail the
build if RAT doesn't succeed. Also, RAT reports a bunch of failures for python
files that I think we want to ignore here.
I'd actually pipe the output of RAT to a file called `rat-results.txt` and
then we should grep that file and see if there are any license errors and if
there are we should exit nonzero from the test runner.
```
java -jar lib/apache-rat-0.10.jar -E .rat-excludes -d . > rat-results.txt
cat rat-results.txt | grep "??"
```
Then if the errors are non-empty we should echo back to the user which
files are missing and fail the test script
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