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Gerrit will automatically identify updates to existing patches and update the existing request instead of creating a new one. This preserves the history of patch comments, and allows comparing old and new versions of a patch for more efficient inspections. For this to work properly the changes you create locally need to have a unique commit id in them. To get the Commit-Id field inserted automatically, copy the commit-msg hook from the build/ subdirectory into each Git repository's .git/hooks/ directory. This will update the commit message for changes you commit to your repository before they are submitted to Gerrit. The commit-msg hook will also verify that the commit message format matches the format specified above. Similarly, copying the prepare-commit-msg script from build/ to .git/hooks/ will run the build/checkpatch.pl script against each patch at commit time to check it against the Lustre Coding Guidelines.

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