How do you get git bisect to ignore merged branches?

Question

I\'m aware that git bisect is branch-aware by design, so that if between good commit, G, and bad commit, B, you merged in a branch, it needs to take those changes into consi

Answer 1

Björn Steinbrink's answer works great, but recently started printing this:

hint: Support for /info/grafts is deprecated
hint: and will be removed in a future Git version.
hint: 
hint: Please use "git replace --convert-graft-file"
hint: to convert the grafts into replace refs.
hint: 
hint: Turn this message off by running
hint: "git config advice.graftFileDeprecated false"

Here's a more modern version of his solution using "git replace" instead of grafts:

git rev-list --first-parent --merges --parents HEAD | \
  while read COMMIT PARENT1 PARENT2; do 
    git replace --graft $COMMIT $PARENT1; 
  done

Unfortunately, it is much slower for large repos (around 3 minutes for 150k commits); git replace doesn't seem to have a bulk-mode yet. You might want to restrict the rev-list to only the commits in scope of your bisect.

To remove the replacements when you are done, you can rm .git/refs/replace/* .