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Debugging with Git.md

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Debugging with Git

#git

File Annotation

File annotation allows tracking down of bugs by showing what commits modified each line of any file in the repository.

-git blame: determine which commit introduced a line

Further, Git can track code movement of code snippets between files. This can help figure out where the original code came from.

Binary Search

When the commit where the bug was introduced is unknown and there have been many subsequent commits, git bisect can help narrow down the faulty commit. It uses a binary search to find the bug quickly.

  • git bisect start: Start binary search.
  • git bisect bad: Set the current commit as the broken commit.
  • git bisect good <commit>: Set last known good commit. The command also does a checkout of the middle commit in between the bad and the good commits.
  • git bisect good: Indicate that the middle commit which has been checked out is good. Checkout the middle commit of the second half of the entire set of commits.
  • git bisect bad: Indicate that the middle commit which has been checked out is bad. Checkout the middle commit of the first half of the entire set of commits.
  • git bisect reset: Reset HEAD to position before start of bisect.