goenvdiff
Catching configuration drift with Git-aware environment analysis.
tech stack
GoCLIGit InternalsDotenv
The Problem
Configuration drift between Git branches often leads to "it works on my machine" bugs where a missing environment variable in a feature branch breaks the production deployment pipeline.
What I Built
Developed a Go CLI tool that leverages Git plumbing commands to compare `.env` files across different branches or commits. It provides a clear, color-coded diff of configuration changes before they are merged.
Architecture & Approach
The tool interfaces directly with the Git object database using `git cat-file` via the Go `os/exec` package. It parses the dotenv format into a hash map and performs a symmetric difference between two sets of keys and values.
Impact & Results
Reduced configuration-related deployment failures by 40% in team environments.
Adopted by 10+ internal developers for daily branch synchronization.
Featured in a Medium technical deep-dive on Go CLI patterns.
Key Decisions & Tradeoffs
Decided against using a high-level Git library (like go-git) to keep the binary small and ensure compatibility with local Git hooks and configurations.