Git Hooks and AWS Lambda: Silent Failures and Debugging Lessons from the CLI

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A developer completing a DevOps training track on KodeKloud Engineer implemented a Git post-update hook to automatically tag every push to the master branch with the current date. A key lesson emerged around hook permissions: a hook file missing its execute bit is silently skipped, with no error shown during a push. On the AWS side, an incomplete file-write command caused a zip archive to never be created, triggering a misleading error three steps later when the Lambda deployment failed to find the archive. The session also highlighted that post-update hooks cannot block or reverse a push, since they run after refs have already moved — making pre-receive or update the correct choice for push validation. These examples illustrate a broader debugging principle: errors often surface far from their root cause, requiring developers to trace failures upstream.

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