Tool that allows you to find an offending commit

Start git bisect

git bisect start

Give git a commit where there is not a bug

git bisect good <commit> or git bisect good <tag>
git bisect good a09c728 or or git bisect good v0.4.1

Give git a commit where there is not a bug

git bisect bad <commit>
git bisect bad a09c729
If empty commit will be used last commit

At this point → splitting the revisions in half and loading them up for you. It will checkout each revision and then ask you if the commit is good or bad. and git will take care of the rest Like binary search.

Manually finding bugs with bisect is great but we can also automate it with unit test.

Automatic bisect

git bisect run <file>

After Fix Bug

git bisect reset

Log

git bisect log