Binare suche master theorem
Instead of choosing a nearby commit by yourself, you can ask Git to do it for you by issuing the command:. However, if you skip a commit adjacent to the one you are looking for, Git will be unable to tell exactly which of those commits was the first bad one.
You can also skip a range of commits, instead of just one commit, using range notation. This tells the bisect process that no commit after v2. This tells the bisect process that the commits between v2. You can further cut down the number of trials, if you know what part of the tree is involved in the problem you are tracking down, by specifying path parameters when issuing the bisect start command:.
If you know beforehand more than one good commit, you can narrow the bisect space down by specifying all of the good commits immediately after the bad commit when issuing the bisect start command:.
If you have a script that can tell if the current source code is good or bad, you can bisect by issuing the command:. Any other exit code will abort the bisect process.
The special exit code should be used when the current source code cannot be tested. If the script exits with this code, the current revision will be skipped see git bisect skip above.
You may often find that during a bisect session you want to have temporary modifications e. To cope with such a situation, after the inner git bisect finds the next revision to test, the script can apply the patch before compiling, run the real test, and afterwards decide if the revision possibly with the needed patch passed the test and then rewind the tree to the pristine state.
Finally the script should exit with the status of the real test to let the git bisect run command loop determine the eventual outcome of the bisect session. Do not checkout the new working tree at each iteration of the bisection process. This option may be useful when the test you would perform in each step does not require a checked out tree. Here we use a test. In this script, if make fails, we skip the current commit. It is safer if both test. This applies modifications from a hot-fix branch before each test run, e.
Make sure the hot-fix branch is based off a commit which is contained in all revisions which you are bisecting, so that the merge does not pull in too much, or use git cherry-pick instead of git merge. Use git bisect to get a short usage description, and git bisect help or git bisect -h to get a long usage description. Fighting regressions with git bisect , git-blame. Inspection and Comparison show log diff shortlog describe Patching apply cherry-pick diff rebase revert Debugging bisect blame grep Email am apply format-patch send-email request-pull External Systems svn fast-import Server Admin daemon update-server-info.
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NAME git-bisect - Use binary search to find the commit that introduced a bug. You start a bisect session as follows: Once you have specified at least one bad and one good commit, git bisect selects a commit in the middle of that range of history, checks it out, and outputs something similar to the following: Bisect reset After a bisect session, to clean up the bisection state and return to the original HEAD, issue the following command: With an optional argument, you can return to a different commit instead: Alternate terms Sometimes you are not looking for the commit that introduced a breakage, but rather for a commit that caused a change between some other "old" state and "new" state.
To use "old" and "new" instead of "good" and bad, you must run git bisect start without commits as argument and then run the following commands to add the commits: Bisect log and bisect replay After having marked revisions as good or bad, issue the following command to show what has been done so far: If you discover that you made a mistake in specifying the status of a revision, you can save the output of this command to a file, edit it to remove the incorrect entries, and then issue the following commands to return to a corrected state: Avoiding testing a commit If, in the middle of a bisect session, you know that the suggested revision is not a good one to test e.
Bisect skip Instead of choosing a nearby commit by yourself, you can ask Git to do it for you by issuing the command: Note that if you also want to skip the first commit of the range you would issue the command: Cutting down bisection by giving more parameters to bisect start You can further cut down the number of trials, if you know what part of the tree is involved in the problem you are tracking down, by specifying path parameters when issuing the bisect start command: Alle Vorlesungen werden aufgezeichnet durch die Video-AG.
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