git bisect run — automated binary search for a regression

git-bisect.sh

# git bisect — binary search your blame
# Manual mode: you tell git good/bad at each step.

git bisect start
git bisect bad                  # current commit is broken
git bisect good v2.3.0          # this tag was clean

# git checks out the midpoint — test, then:
git bisect good   # or: git bisect bad
# repeat ~7 times until git prints the culprit

git bisect reset  # back to HEAD when done

# ── Automated mode (the real power) ──────────────────────────
# Any command that exits 0 (pass) or non-zero (fail) works as oracle.

git bisect start
git bisect bad HEAD
git bisect good v2.3.0
git bisect run python3 tests/test_regression.py
git bisect reset