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author | Junio C Hamano <junio@hera.kernel.org> | 2007-03-24 07:16:42 +0000 |
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committer | Junio C Hamano <junio@hera.kernel.org> | 2007-03-24 07:16:42 +0000 |
commit | b60308af319f44ed4baa08874c979cf9d8e7cc66 (patch) | |
tree | 6b5b8ff3f8851e4bec4b0833187ac35999e50a44 /git-bisect.txt | |
parent | f440a23a2e5ede0fd87209fb0b6942e17bf2e7e7 (diff) | |
download | git-htmldocs-b60308af319f44ed4baa08874c979cf9d8e7cc66.tar.gz |
Autogenerated HTML docs for v1.5.1-rc1-51-gb08b
Diffstat (limited to 'git-bisect.txt')
-rw-r--r-- | git-bisect.txt | 118 |
1 files changed, 72 insertions, 46 deletions
diff --git a/git-bisect.txt b/git-bisect.txt index b7cd71538..b2bc58d85 100644 --- a/git-bisect.txt +++ b/git-bisect.txt @@ -12,8 +12,8 @@ SYNOPSIS DESCRIPTION ----------- -The command takes various subcommands, and different options -depending on the subcommand: +The command takes various subcommands, and different options depending +on the subcommand: git bisect start [<paths>...] git bisect bad <rev> @@ -24,29 +24,32 @@ depending on the subcommand: git bisect log git bisect run <cmd>... -This command uses 'git-rev-list --bisect' option to help drive -the binary search process to find which change introduced a bug, -given an old "good" commit object name and a later "bad" commit -object name. +This command uses 'git-rev-list --bisect' option to help drive the +binary search process to find which change introduced a bug, given an +old "good" commit object name and a later "bad" commit object name. + +Basic bisect commands: start, bad, good +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The way you use it is: ------------------------------------------------ $ git bisect start -$ git bisect bad # Current version is bad -$ git bisect good v2.6.13-rc2 # v2.6.13-rc2 was the last version - # tested that was good +$ git bisect bad # Current version is bad +$ git bisect good v2.6.13-rc2 # v2.6.13-rc2 was the last version + # tested that was good ------------------------------------------------ -When you give at least one bad and one good versions, it will -bisect the revision tree and say something like: +When you give at least one bad and one good versions, it will bisect +the revision tree and say something like: ------------------------------------------------ Bisecting: 675 revisions left to test after this ------------------------------------------------ -and check out the state in the middle. Now, compile that kernel, and boot -it. Now, let's say that this booted kernel works fine, then just do +and check out the state in the middle. Now, compile that kernel, and +boot it. Now, let's say that this booted kernel works fine, then just +do ------------------------------------------------ $ git bisect good # this one is good @@ -58,12 +61,15 @@ which will now say Bisecting: 337 revisions left to test after this ------------------------------------------------ -and you continue along, compiling that one, testing it, and depending on -whether it is good or bad, you say "git bisect good" or "git bisect bad", -and ask for the next bisection. +and you continue along, compiling that one, testing it, and depending +on whether it is good or bad, you say "git bisect good" or "git bisect +bad", and ask for the next bisection. + +Until you have no more left, and you'll have been left with the first +bad kernel rev in "refs/bisect/bad". -Until you have no more left, and you'll have been left with the first bad -kernel rev in "refs/bisect/bad". +Bisect reset +~~~~~~~~~~~~ Oh, and then after you want to reset to the original head, do a @@ -71,10 +77,13 @@ Oh, and then after you want to reset to the original head, do a $ git bisect reset ------------------------------------------------ -to get back to the master branch, instead of being in one of the bisection -branches ("git bisect start" will do that for you too, actually: it will -reset the bisection state, and before it does that it checks that you're -not using some old bisection branch). +to get back to the master branch, instead of being in one of the +bisection branches ("git bisect start" will do that for you too, +actually: it will reset the bisection state, and before it does that +it checks that you're not using some old bisection branch). + +Bisect visualize +~~~~~~~~~~~~~~~~ During the bisection process, you can say @@ -84,9 +93,17 @@ $ git bisect visualize to see the currently remaining suspects in `gitk`. -The good/bad input is logged, and `git bisect -log` shows what you have done so far. You can truncate its -output somewhere and save it in a file, and run +Bisect log and bisect replay +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The good/bad input is logged, and + +------------ +$ git bisect log +------------ + +shows what you have done so far. You can truncate its output somewhere +and save it in a file, and run ------------ $ git bisect replay that-file @@ -95,12 +112,16 @@ $ git bisect replay that-file if you find later you made a mistake telling good/bad about a revision. -If in a middle of bisect session, you know what the bisect -suggested to try next is not a good one to test (e.g. the change -the commit introduces is known not to work in your environment -and you know it does not have anything to do with the bug you -are chasing), you may want to find a near-by commit and try that -instead. It goes something like this: +Avoiding to test a commit +~~~~~~~~~~~~~~~~~~~~~~~~~ + +If in a middle of bisect session, you know what the bisect suggested +to try next is not a good one to test (e.g. the change the commit +introduces is known not to work in your environment and you know it +does not have anything to do with the bug you are chasing), you may +want to find a near-by commit and try that instead. + +It goes something like this: ------------ $ git bisect good/bad # previous round was good/bad. @@ -110,33 +131,38 @@ $ git reset --hard HEAD~3 # try 3 revs before what # was suggested ------------ -Then compile and test the one you chose to try. After that, -tell bisect what the result was as usual. +Then compile and test the one you chose to try. After that, tell +bisect what the result was as usual. + +Cutting down bisection by giving path parameter 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 giving paths parameters when you say `bisect start`, -like this: +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 giving +paths parameters when you say `bisect start`, like this: ------------ $ git bisect start arch/i386 include/asm-i386 ------------ -If you have a script that can tell if the current -source code is good or bad, you can automatically bisect using: +Bisect run +~~~~~~~~~~ + +If you have a script that can tell if the current source code is good +or bad, you can automatically bisect using: ------------ $ git bisect run my_script ------------ -Note that the "run" script (`my_script` in the above example) -should exit with code 0 in -case the current source code is good and with a code between 1 and 127 -(included) in case the current source code is bad. +Note that the "run" script (`my_script` in the above example) should +exit with code 0 in case the current source code is good and with a +code between 1 and 127 (included) in case the current source code is +bad. -Any other exit code (a program that does "exit(-1)" leaves $? = 255, -see exit(3) manual page, the value is chopped with "& 0377") will -abort the automatic bisect process. +Any other exit code will abort the automatic bisect process. (A +program that does "exit(-1)" leaves $? = 255, see exit(3) manual page, +the value is chopped with "& 0377".) You may often find that during bisect you want to have near-constant tweaks (e.g., s/#define DEBUG 0/#define DEBUG 1/ in a header file, or |