Lion Cipher Lab
Set up a pre-commit security hook
- Cyber / Security Engineer
- Beginner
- ~30 min
- Free · no account required
Why it matters
The cheapest moment to stop a secret or an obvious mistake is before it becomes part of git history. Once a credential lands in a commit and gets pushed, it is exposed and has to be rotated -- a real, expensive cleanup -- because git history remembers even after you delete the line. A pre-commit hook moves the check earlier: it runs automatically at the instant you commit and refuses to let a leak through, so the mistake never happens instead of being fixed afterward. The pre-commit framework makes this a five-minute, free setup that guards every commit you make from then on. It is one of the…
What you'll learn
- pre-commit framework
- git hooks
- catching secrets before commit
- writing a .pre-commit-config.yaml
- defense in depth
- knowing a hook's limits
Steps in this lab
- What a git hook is, and why it beats scanning later
- Open a terminal and move into a repo you own
- Install the pre-commit tool
- Write a .pre-commit-config.yaml with real checks
- Install the hook into git
- Try to commit a fake secret and watch it get blocked
- The reality: a safety net, not a guarantee
- The habit you just started