projects / thirdparty / git.git / blame
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|---|---|---|
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1 | git-bisect-script(1) |
| 2 | ==================== | |
| 3 | ||
| 4 | NAME | |
| 5 | ---- | |
| f85a4191 | 6 | git-bisect-script - Find the change that introduced a bug |
| 7fc9d69f JH |
7 | |
| 8 | ||
| 9 | SYNOPSIS | |
| 10 | -------- | |
| f85a4191 JH |
11 | 'git bisect' start |
| 12 | 'git bisect' bad <rev> | |
| 13 | 'git bisect' good <rev> | |
| 14 | 'git bisect' reset [<branch>] | |
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15 | |
| 16 | DESCRIPTION | |
| 17 | ----------- | |
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18 | This command uses 'git-rev-list --bisect' option to help drive |
| 19 | the binary search process to find which change introduced a bug, | |
| 20 | given an old "good" commit object name and a later "bad" commit | |
| 21 | object name. | |
| 7fc9d69f | 22 | |
| f85a4191 | 23 | The way you use it is: |
| 7fc9d69f | 24 | |
| f85a4191 JH |
25 | ------------------------------------------------ |
| 26 | git bisect start | |
| 27 | git bisect bad # Current version is bad | |
| 28 | git bisect good v2.6.13-rc2 # v2.6.13-rc2 was the last version | |
| 29 | # tested that was good | |
| 30 | ------------------------------------------------ | |
| 7fc9d69f | 31 | |
| f85a4191 JH |
32 | When you give at least one bad and one good versions, it will |
| 33 | bisect the revision tree and say something like: | |
| 34 | ||
| 35 | ------------------------------------------------ | |
| 36 | Bisecting: 675 revisions left to test after this | |
| 37 | ------------------------------------------------ | |
| 38 | ||
| 39 | and check out the state in the middle. Now, compile that kernel, and boot | |
| 40 | it. Now, let's say that this booted kernel works fine, then just do | |
| 41 | ||
| 42 | ------------------------------------------------ | |
| 43 | git bisect good # this one is good | |
| 44 | ------------------------------------------------ | |
| 45 | ||
| 46 | which will now say | |
| 47 | ||
| 48 | ------------------------------------------------ | |
| 49 | Bisecting: 337 revisions left to test after this | |
| 50 | ------------------------------------------------ | |
| 51 | ||
| 52 | and you continue along, compiling that one, testing it, and depending on | |
| 53 | whether it is good or bad, you say "git bisect good" or "git bisect bad", | |
| 54 | and ask for the next bisection. | |
| 55 | ||
| 56 | Until you have no more left, and you'll have been left with the first bad | |
| 57 | kernel rev in "refs/bisect/bad". | |
| 58 | ||
| 59 | Oh, and then after you want to reset to the original head, do a | |
| 60 | ||
| 61 | ------------------------------------------------ | |
| 62 | git bisect reset | |
| 63 | ------------------------------------------------ | |
| 64 | ||
| 65 | to get back to the master branch, instead of being in one of the bisection | |
| 66 | branches ("git bisect start" will do that for you too, actually: it will | |
| 67 | reset the bisection state, and before it does that it checks that you're | |
| 68 | not using some old bisection branch). | |
| 7fc9d69f JH |
69 | |
| 70 | ||
| 71 | Author | |
| 72 | ------ | |
| 73 | Written by Linus Torvalds <torvalds@osdl.org> | |
| 74 | ||
| 75 | Documentation | |
| 76 | -------------- | |
| 77 | Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>. | |
| 78 | ||
| 79 | GIT | |
| 80 | --- | |
| 81 | Part of the link:git.html[git] suite | |
| 82 |