[MRELEASE-915] Forked execution of perform leaks source roots

**[Benson Margulies](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=bmargulies)** opened **[MRELEASE-915](https://issues.apache.org/jira/browse/MRELEASE-915?redirect=false)** and commented

https://github.com/bimargulies/release-root-leakage is a test case for the following:

If you add a source root in generate-sources in a pom, that source root will show up in the 'validate' phase in the forked execution for release:perform. This causes checkstyle to see things that it should not, if nothing else bad.

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**Affects:** 2.5.1

1 votes, 4 watchers

Start with the test case at https://github.com/bimargulies/release-root-leakage and reproduce the issue around release:perform, generate-sources, and the forked validate phase. Trace how source roots carry into the forked execution; done means roots added during generate-sources no longer appear there, so checkstyle does not inspect them unexpectedly.

Written by the indexing model from the issue text.