ktoso/maven-git-commit-id-plugin — pull request #70 by Vlatombe (2013-07-14 09:23:16+00:00)
Title: Generate git.properties in ${project.build.outputDirectory} by default.

Maven best practice is that every file under src/ should be under version control.

So, by default, the plugin should generate git.properties under ${project.build.outputDirectory} which is the output directory for src/main/resources.