How to use Git to hunt for bugs origin
When a bug happens, its origin is not always obvious
Debugging to find where it comes from can be tedious
It is often possible to know roughly when it used to work (master, yesterday, last release...)
Is it possible to narrow down even more the set of potential breaking changes?
git bisect
Use binary search to find the commit that introduced a bug
git-bisect man page
git bisect
principle
git bisect
commands
git bisect start
git bisect good <known good commit>
git bisect bad <known bad commit>
test
git bisect good OR git bisect bad depending on test result
1:
2:
3:
4:
5:
Go to 6 and repeat until the end
6:
git bisect reset (to exit the bisect mode)
7:
git bisect
pros/cons
git bisect
limits
every commit must be working to be able to properly test
better with atomic and targeted commits