find-broken-pr

#!/usr/bin/env sh

echo
echo -e "\e[96m--------------------- Bisecting to find breaking merge commits / PRs ---------------------\e[39m"
echo

bad_commit=$1
good_commit=$2
shift 2
git_run_command_and_args=$@

git bisect start
git bisect bad "${bad_commit}"
git bisect good "${good_commit}" 
prCommits=$(for commit in $(git rev-list "$good_commit".."$bad_commit" --merges --first-parent); do
  git rev-list "$commit"^2 --not "$commit"^
done)
echo "$prCommits" | xargs git bisect skip
git bisect run "${git_run_command_and_args}"

[ $? -eq 2 ] && echo && echo "Breaking merge commit / PR merge is:" && git log -1