{"id":78,"date":"2025-01-01T05:51:40","date_gmt":"2025-01-01T05:51:40","guid":{"rendered":"https:\/\/techkubo.com\/git\/?p=78"},"modified":"2025-05-23T19:14:24","modified_gmt":"2025-05-23T19:14:24","slug":"git-bisect","status":"publish","type":"post","link":"https:\/\/techkubo.com\/git\/git-bisect\/","title":{"rendered":"Git bisect"},"content":{"rendered":"\n

git bisect<\/code> helps you find the commit that introduced a bug by using binary search. It allows you to efficiently identify the exact commit where things went wrong.<\/p>\n\n\n\n

Initial Example<\/h2>\n\n\n\n

To start a bisect session, you need to mark a known bad commit and a known good commit:<\/p>\n\n\n\n

$ git bisect start\n$ git bisect bad <bad_commit>\n$ git bisect good <good_commit><\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
BISECT Options<\/h2>\n\n\n\n
Option<\/th>Description<\/th><\/tr><\/thead>
start<\/code><\/td>Start a bisect session.<\/td><\/tr>
bad<\/code><\/td>Mark the current commit as bad (contains the bug).<\/td><\/tr>
good<\/code><\/td>Mark the specified commit as good (doesn’t contain the bug).<\/td><\/tr>
reset<\/code><\/td>End the bisect session and return to the original branch.<\/td><\/tr>
skip<\/code><\/td>Skip the current commit if it cannot be tested (e.g., it doesn’t compile).<\/td><\/tr>
run <script><\/code><\/td>Automate the bisect process using a script that tests commits. The script should return 0<\/code> for good commits and 1<\/code> for bad commits.<\/td><\/tr>
visualize<\/code><\/td>Display the remaining suspects in the bisect process using a graphical tool.<\/td><\/tr>
log<\/code><\/td>Show a log of the bisect steps taken during the session.<\/td><\/tr>
view<\/code><\/td>Open the current commit in the default text editor for inspection.<\/td><\/tr>
--no-checkout<\/code><\/td>Do not checkout the new working tree at each iteration of the bisection process. Instead, update the reference named BISECT_HEAD to point to the commit to be tested. Useful when the test does not require a checked-out tree. If the repository is bare, this is assumed.<\/td><\/tr>
--first-parent<\/code><\/td>Follow only the first parent commit upon seeing a merge commit. Useful to avoid false positives when merged branches contain broken commits but the merge itself is OK.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Examples<\/h2>\n\n\n\n
1. Basic Bisect<\/h4>\n\n\n\n
To find the commit that introduced a bug:<\/p>\n\n\n\n
    \n
  • Start the bisect session:<\/li>\n<\/ul>\n\n\n\n
    $ git bisect start<\/pre><\/div>\n\n\n\n
      \n
    • Mark the current commit as bad:<\/li>\n<\/ul>\n\n\n\n
      $ git bisect bad<\/pre><\/div>\n\n\n\n
        \n
      • Mark an older commit as good:<\/li>\n<\/ul>\n\n\n\n
        $ git bisect good <good_commit><\/pre><\/div>\n\n\n\n
          \n
        • Git will now check out a commit in the middle. Test the commit:<\/li>\n\n\n\n
        • If the commit is bad, mark it as bad:
          sh $ git bisect bad<\/code><\/li>\n\n\n\n
        • If the commit is good, mark it as good: $ git bisect good<\/code><\/li>\n\n\n\n
        • Repeat the process until Git identifies the exact commit that introduced the bug.<\/li>\n<\/ul>\n\n\n\n
          2. Automating Bisect<\/h4>\n\n\n\n
          You can automate the bisect process with a script:<\/p>\n\n\n\n
            \n
          • Run the bisect session with a script:<\/li>\n<\/ul>\n\n\n\n
            $ git bisect start\n$ git bisect bad\n$ git bisect good <good_commit><\/pre><\/div>\n\n\n\n
              \n
            • Use the run<\/code> command to automate the testing process:<\/li>\n<\/ul>\n\n\n\n
              $ git bisect run <script><\/pre><\/div>\n\n\n\n
                \n
              • The script should return 0<\/code> for good commits and 1<\/code> for bad commits.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                git bisect helps you find the commit that introduced a bug by using binary search. 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