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| author | Junio C Hamano <junio@hera.kernel.org> | 2005-12-27 00:17:23 -0800 |
|---|---|---|
| committer | Junio C Hamano <junio@hera.kernel.org> | 2005-12-27 00:17:23 -0800 |
| commit | 1a4e841b439ba014b365999c3a6b9e2be3740bd8 (patch) | |
| tree | 263dbc68b55d73929f82a6d1f7df677dfb06e294 /git-bisect.html | |
| download | git-htmldocs-1a4e841b439ba014b365999c3a6b9e2be3740bd8.tar.gz | |
Autogenerated HTML docs for 36de72aa9dc3b7daf8cf2770c840f39bb0d2ae70
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+<title>git-bisect(1)</title>
+</head>
+<body>
+<div id="header">
+<h1>
+git-bisect(1) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>git-bisect -
+ Find the change that introduced a bug
+</p>
+</div>
+</div>
+<h2>SYNOPSIS</h2>
+<div class="sectionbody">
+<p><em>git bisect</em> <subcommand> <options></p>
+</div>
+<h2>DESCRIPTION</h2>
+<div class="sectionbody">
+<p>The command takes various subcommands, and different options
+depending on the subcommand:</p>
+<div class="literalblock">
+<div class="content">
+<pre><tt>git bisect start [<paths>...]
+git bisect bad <rev>
+git bisect good <rev>
+git bisect reset [<branch>]
+git bisect visualize
+git bisect replay <logfile>
+git bisect log</tt></pre>
+</div></div>
+<p>This command uses <em>git-rev-list --bisect</em> 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.</p>
+<p>The way you use it is:</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ 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</tt></pre>
+</div></div>
+<p>When you give at least one bad and one good versions, it will
+bisect the revision tree and say something like:</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>Bisecting: 675 revisions left to test after this</tt></pre>
+</div></div>
+<p>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</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect good # this one is good</tt></pre>
+</div></div>
+<p>which will now say</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>Bisecting: 337 revisions left to test after this</tt></pre>
+</div></div>
+<p>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.</p>
+<p>Until you have no more left, and you'll have been left with the first bad
+kernel rev in "refs/bisect/bad".</p>
+<p>Oh, and then after you want to reset to the original head, do a</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect reset</tt></pre>
+</div></div>
+<p>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).</p>
+<p>During the bisection process, you can say</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect visualize</tt></pre>
+</div></div>
+<p>to see the currently remaining suspects in <tt>gitk</tt>.</p>
+<p>The good/bad input is logged, and <tt>git bisect
+log</tt> shows what you have done so far. You can truncate its
+output somewhere and save it in a file, and run</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect replay that-file</tt></pre>
+</div></div>
+<p>if you find later you made a mistake telling good/bad about a
+revision.</p>
+<p>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:</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect good/bad # previous round was good/bad.
+Bisecting: 337 revisions left to test after this
+$ git bisect visualize # oops, that is uninteresting.
+$ git reset --hard HEAD~3 # try 3 revs before what
+ # was suggested</tt></pre>
+</div></div>
+<p>Then compile and test the one you chose to try. After that,
+tell bisect what the result was as usual.</p>
+<p>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 <tt>bisect start</tt>,
+like this:</p>
+<div class="listingblock">
+<div class="content">
+<pre><tt>$ git bisect start arch/i386 include/asm-i386</tt></pre>
+</div></div>
+</div>
+<h2>Author</h2>
+<div class="sectionbody">
+<p>Written by Linus Torvalds <torvalds@osdl.org></p>
+</div>
+<h2>Documentation</h2>
+<div class="sectionbody">
+<p>Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>.</p>
+</div>
+<h2>GIT</h2>
+<div class="sectionbody">
+<p>Part of the <a href="git.html">git(7)</a> suite</p>
+</div>
+<div id="footer">
+<div id="footer-text">
+Last updated 27-Dec-2005 00:15:48 PDT
+</div>
+</div>
+</body>
+</html>
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