Github user mwws commented on the issue:
https://github.com/apache/flink/pull/2179
@greghogan Thanks so much for point this file out! In my case, `../../.git`
file exists, so the `lookupGitDirectory` method direct return without smartly
search the basePath directory hierarchy.
https://github.com/ktoso/maven-git-commit-id-plugin/blob/v2.1.15/src/main/java/pl/project13/maven/git/GitDirLocator.java#L45
On the other hand, for most of people, `../../.git` doesn't exis, so the
compile can work.
Everything make sense now. And I think this RP is still a valid fix.
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