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229 include::./stylesheets/xhtml11-manpage.css[]
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256 padding-left: 0.5em;
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259 <title>git-bisect(1)</title>
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264 git-bisect(1) Manual Page
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267 <div class="sectionbody">
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269 Find the change that introduced a bug
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274 <div class="sectionbody">
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275 <p><em>git bisect</em> <subcommand> <options></p>
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277 <h2>DESCRIPTION</h2>
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278 <div class="sectionbody">
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279 <p>The command takes various subcommands, and different options
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280 depending on the subcommand:</p>
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281 <div class="literalblock">
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282 <div class="content">
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283 <pre><tt>git bisect start [<paths>...]
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284 git bisect bad <rev>
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285 git bisect good <rev>
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286 git bisect reset [<branch>]
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287 git bisect visualize
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288 git bisect replay <logfile>
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289 git bisect log</tt></pre>
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291 <p>This command uses <em>git-rev-list --bisect</em> option to help drive
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292 the binary search process to find which change introduced a bug,
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293 given an old "good" commit object name and a later "bad" commit
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295 <p>The way you use it is:</p>
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296 <div class="listingblock">
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297 <div class="content">
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298 <pre><tt>$ git bisect start
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299 $ git bisect bad # Current version is bad
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300 $ git bisect good v2.6.13-rc2 # v2.6.13-rc2 was the last version
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301 # tested that was good</tt></pre>
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303 <p>When you give at least one bad and one good versions, it will
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304 bisect the revision tree and say something like:</p>
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305 <div class="listingblock">
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306 <div class="content">
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307 <pre><tt>Bisecting: 675 revisions left to test after this</tt></pre>
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309 <p>and check out the state in the middle. Now, compile that kernel, and boot
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310 it. Now, let's say that this booted kernel works fine, then just do</p>
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311 <div class="listingblock">
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312 <div class="content">
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313 <pre><tt>$ git bisect good # this one is good</tt></pre>
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315 <p>which will now say</p>
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316 <div class="listingblock">
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317 <div class="content">
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318 <pre><tt>Bisecting: 337 revisions left to test after this</tt></pre>
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320 <p>and you continue along, compiling that one, testing it, and depending on
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321 whether it is good or bad, you say "git bisect good" or "git bisect bad",
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322 and ask for the next bisection.</p>
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323 <p>Until you have no more left, and you'll have been left with the first bad
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324 kernel rev in "refs/bisect/bad".</p>
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325 <p>Oh, and then after you want to reset to the original head, do a</p>
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326 <div class="listingblock">
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327 <div class="content">
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328 <pre><tt>$ git bisect reset</tt></pre>
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330 <p>to get back to the master branch, instead of being in one of the bisection
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331 branches ("git bisect start" will do that for you too, actually: it will
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332 reset the bisection state, and before it does that it checks that you're
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333 not using some old bisection branch).</p>
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334 <p>During the bisection process, you can say</p>
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335 <div class="listingblock">
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336 <div class="content">
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337 <pre><tt>$ git bisect visualize</tt></pre>
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339 <p>to see the currently remaining suspects in <tt>gitk</tt>.</p>
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340 <p>The good/bad input is logged, and <tt>git bisect
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341 log</tt> shows what you have done so far. You can truncate its
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342 output somewhere and save it in a file, and run</p>
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343 <div class="listingblock">
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344 <div class="content">
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345 <pre><tt>$ git bisect replay that-file</tt></pre>
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347 <p>if you find later you made a mistake telling good/bad about a
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349 <p>If in a middle of bisect session, you know what the bisect
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350 suggested to try next is not a good one to test (e.g. the change
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351 the commit introduces is known not to work in your environment
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352 and you know it does not have anything to do with the bug you
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353 are chasing), you may want to find a near-by commit and try that
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354 instead. It goes something like this:</p>
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355 <div class="listingblock">
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356 <div class="content">
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357 <pre><tt>$ git bisect good/bad # previous round was good/bad.
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358 Bisecting: 337 revisions left to test after this
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359 $ git bisect visualize # oops, that is uninteresting.
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360 $ git reset --hard HEAD~3 # try 3 revs before what
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361 # was suggested</tt></pre>
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363 <p>Then compile and test the one you chose to try. After that,
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364 tell bisect what the result was as usual.</p>
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365 <p>You can further cut down the number of trials if you know what
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366 part of the tree is involved in the problem you are tracking
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367 down, by giving paths parameters when you say <tt>bisect start</tt>,
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369 <div class="listingblock">
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370 <div class="content">
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371 <pre><tt>$ git bisect start arch/i386 include/asm-i386</tt></pre>
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375 <div class="sectionbody">
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376 <p>Written by Linus Torvalds <torvalds@osdl.org></p>
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378 <h2>Documentation</h2>
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379 <div class="sectionbody">
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380 <p>Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>.</p>
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383 <div class="sectionbody">
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384 <p>Part of the <a href="git.html">git(7)</a> suite</p>
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387 <div id="footer-text">
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388 Last updated 27-Dec-2005 00:15:48 PDT
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