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Diffstat (limited to 'Documentation/git-bisect.txt')
| -rw-r--r-- | Documentation/git-bisect.txt | 41 |
1 files changed, 39 insertions, 2 deletions
diff --git a/Documentation/git-bisect.txt b/Documentation/git-bisect.txt index ab60a18470..038514b51e 100644 --- a/Documentation/git-bisect.txt +++ b/Documentation/git-bisect.txt @@ -17,7 +17,7 @@ The command takes various subcommands, and different options depending on the subcommand: git bisect help - git bisect start [<bad> [<good>...]] [--] [<paths>...] + git bisect start [--no-checkout] [<bad> [<good>...]] [--] [<paths>...] git bisect bad [<rev>] git bisect good [<rev>...] git bisect skip [(<rev>|<range>)...] @@ -83,7 +83,7 @@ Bisect reset ~~~~~~~~~~~~ After a bisect session, to clean up the bisection state and return to -the original HEAD, issue the following command: +the original HEAD (i.e., to quit bisecting), issue the following command: ------------------------------------------------ $ git bisect reset @@ -263,6 +263,19 @@ 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. +OPTIONS +------- +--no-checkout:: ++ +Do not checkout the new working tree at each iteration of the bisection +process. Instead just update a special reference named 'BISECT_HEAD' to make +it point to the commit that should be tested. ++ +This option may be useful when the test you would perform in each step +does not require a checked out tree. ++ +If the repository is bare, `--no-checkout` is assumed. + EXAMPLES -------- @@ -271,6 +284,7 @@ EXAMPLES ------------ $ git bisect start HEAD v1.2 -- # HEAD is bad, v1.2 is good $ git bisect run make # "make" builds the app +$ git bisect reset # quit the bisect session ------------ * Automatically bisect a test failure between origin and HEAD: @@ -278,6 +292,7 @@ $ git bisect run make # "make" builds the app ------------ $ git bisect start HEAD origin -- # HEAD is bad, origin is good $ git bisect run make test # "make test" builds and tests +$ git bisect reset # quit the bisect session ------------ * Automatically bisect a broken test case: @@ -289,6 +304,7 @@ make || exit 125 # this skips broken builds ~/check_test_case.sh # does the test case pass? $ git bisect start HEAD HEAD~10 -- # culprit is among the last 10 $ git bisect run ~/test.sh +$ git bisect reset # quit the bisect session ------------ + Here we use a "test.sh" custom script. In this script, if "make" @@ -338,11 +354,32 @@ use `git cherry-pick` instead of `git merge`.) ------------ $ git bisect start HEAD HEAD~10 -- # culprit is among the last 10 $ git bisect run sh -c "make || exit 125; ~/check_test_case.sh" +$ git bisect reset # quit the bisect session ------------ + This shows that you can do without a run script if you write the test on a single line. +* Locate a good region of the object graph in a damaged repository ++ +------------ +$ git bisect start HEAD <known-good-commit> [ <boundary-commit> ... ] --no-checkout +$ git bisect run sh -c ' + GOOD=$(git for-each-ref "--format=%(objectname)" refs/bisect/good-*) && + git rev-list --objects BISECT_HEAD --not $GOOD >tmp.$$ && + git pack-objects --stdout >/dev/null <tmp.$$ + rc=$? + rm -f tmp.$$ + test $rc = 0' + +$ git bisect reset # quit the bisect session +------------ ++ +In this case, when 'git bisect run' finishes, bisect/bad will refer to a commit that +has at least one parent whose reachable graph is fully traversable in the sense +required by 'git pack objects'. + + SEE ALSO -------- link:git-bisect-lk2009.html[Fighting regressions with git bisect], |