Gecko [ nbspublicschool.com ]

Name	Size	Permission
RelNotes	[ DIR ]	drwxr-xr-x
contrib	[ DIR ]	drwxr-xr-x
howto	[ DIR ]	drwxr-xr-x
technical	[ DIR ]	drwxr-xr-x
COPYING	18.33 KB	-rw-r--r--
README	2.56 KB	-rw-r--r--
blame-options.txt	3.95 KB	-rw-r--r--
cmds-ancillaryinterrogators.tx...	1.18 KB	-rw-r--r--
cmds-ancillarymanipulators.txt	1005 B	-rw-r--r--
cmds-foreignscminterface.txt	760 B	-rw-r--r--
cmds-mainporcelain.txt	2.5 KB	-rw-r--r--
cmds-plumbinginterrogators.txt	1.34 KB	-rw-r--r--
cmds-plumbingmanipulators.txt	1.21 KB	-rw-r--r--
cmds-purehelpers.txt	1.11 KB	-rw-r--r--
cmds-synchelpers.txt	543 B	-rw-r--r--
cmds-synchingrepositories.txt	397 B	-rw-r--r--
config.txt	90.14 KB	-rw-r--r--
date-formats.txt	848 B	-rw-r--r--
diff-config.txt	6.87 KB	-rw-r--r--
diff-format.txt	5.44 KB	-rw-r--r--
diff-generate-patch.txt	6.44 KB	-rw-r--r--
diff-options.txt	18.12 KB	-rw-r--r--
docbook-xsl.css	4.45 KB	-rw-r--r--
everyday.html	35.06 KB	-rw-r--r--
everyday.txt	12.71 KB	-rw-r--r--
fetch-options.txt	4.22 KB	-rw-r--r--
git-add.html	35.63 KB	-rw-r--r--
git-add.txt	13.96 KB	-rw-r--r--
git-am.html	25.86 KB	-rw-r--r--
git-am.txt	6.02 KB	-rw-r--r--
git-annotate.html	23.32 KB	-rw-r--r--
git-annotate.txt	752 B	-rw-r--r--
git-apply.html	30.82 KB	-rw-r--r--
git-apply.txt	10.07 KB	-rw-r--r--
git-archive.html	25.88 KB	-rw-r--r--
git-archive.txt	6.05 KB	-rw-r--r--
git-bisect-lk2009.html	78.86 KB	-rw-r--r--
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git-bisect.html	33.08 KB	-rw-r--r--
git-bisect.txt	12.38 KB	-rw-r--r--
git-blame.html	37.08 KB	-rw-r--r--
git-blame.txt	7.63 KB	-rw-r--r--
git-branch.html	31.29 KB	-rw-r--r--
git-branch.txt	9.87 KB	-rw-r--r--
git-bundle.html	25.72 KB	-rw-r--r--
git-bundle.txt	6.89 KB	-rw-r--r--
git-cat-file.html	21.04 KB	-rw-r--r--
git-cat-file.txt	2.9 KB	-rw-r--r--
git-check-attr.html	21.17 KB	-rw-r--r--
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git-check-ignore.html	20.25 KB	-rw-r--r--
git-check-ignore.txt	2.35 KB	-rw-r--r--
git-check-ref-format.html	22.43 KB	-rw-r--r--
git-check-ref-format.txt	4.08 KB	-rw-r--r--
git-checkout-index.html	24.34 KB	-rw-r--r--
git-checkout-index.txt	5.31 KB	-rw-r--r--
git-checkout.html	38.47 KB	-rw-r--r--
git-checkout.txt	15.61 KB	-rw-r--r--
git-cherry-pick.html	28.28 KB	-rw-r--r--
git-cherry-pick.txt	7.73 KB	-rw-r--r--
git-cherry.html	19.15 KB	-rw-r--r--
git-cherry.txt	1.71 KB	-rw-r--r--
git-citool.html	17.13 KB	-rw-r--r--
git-citool.txt	543 B	-rw-r--r--
git-clean.html	19.45 KB	-rw-r--r--
git-clean.txt	1.92 KB	-rw-r--r--
git-clone.html	34.75 KB	-rw-r--r--
git-clone.txt	9.84 KB	-rw-r--r--
git-column.html	18.47 KB	-rw-r--r--
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git-commit-tree.html	25.04 KB	-rw-r--r--
git-commit-tree.txt	2.79 KB	-rw-r--r--
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git-config.html	181.42 KB	-rw-r--r--
git-config.txt	11.52 KB	-rw-r--r--
git-count-objects.html	18.11 KB	-rw-r--r--
git-count-objects.txt	1.06 KB	-rw-r--r--
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git-credential-cache.txt	2.13 KB	-rw-r--r--
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git-credential-store.txt	2.11 KB	-rw-r--r--
git-credential.html	23.82 KB	-rw-r--r--
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git-cvsexportcommit.html	21.34 KB	-rw-r--r--
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git-cvsimport.html	27.62 KB	-rw-r--r--
git-cvsimport.txt	7.57 KB	-rw-r--r--
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git-cvsserver.txt	15.21 KB	-rw-r--r--
git-daemon.html	32.69 KB	-rw-r--r--
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git-describe.html	24.35 KB	-rw-r--r--
git-describe.txt	5.59 KB	-rw-r--r--
git-diff-files.html	59.9 KB	-rw-r--r--
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git-diff-index.html	64.69 KB	-rw-r--r--
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git-diff-tree.html	82.31 KB	-rw-r--r--
git-diff-tree.txt	5.26 KB	-rw-r--r--
git-diff.html	66.63 KB	-rw-r--r--
git-diff.txt	5.34 KB	-rw-r--r--
git-difftool.html	22.93 KB	-rw-r--r--
git-difftool.txt	4.02 KB	-rw-r--r--
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git-fast-export.txt	5.16 KB	-rw-r--r--
git-fast-import.html	92.66 KB	-rw-r--r--
git-fast-import.txt	53.75 KB	-rw-r--r--
git-fetch-pack.html	21.26 KB	-rw-r--r--
git-fetch-pack.txt	3.28 KB	-rw-r--r--
git-fetch.html	38.95 KB	-rw-r--r--
git-fetch.txt	2.65 KB	-rw-r--r--
git-filter-branch.html	37.67 KB	-rw-r--r--
git-filter-branch.txt	16.84 KB	-rw-r--r--
git-fmt-merge-msg.html	19.55 KB	-rw-r--r--
git-fmt-merge-msg.txt	1.87 KB	-rw-r--r--
git-for-each-ref.html	25.45 KB	-rw-r--r--
git-for-each-ref.txt	5.72 KB	-rw-r--r--
git-format-patch.html	58.91 KB	-rw-r--r--
git-format-patch.txt	18.38 KB	-rw-r--r--
git-fsck-objects.html	16.88 KB	-rw-r--r--
git-fsck-objects.txt	354 B	-rw-r--r--
git-fsck.html	23.33 KB	-rw-r--r--
git-fsck.txt	4.54 KB	-rw-r--r--
git-gc.html	23.82 KB	-rw-r--r--
git-gc.txt	5.34 KB	-rw-r--r--
git-get-tar-commit-id.html	17.32 KB	-rw-r--r--
git-get-tar-commit-id.txt	737 B	-rw-r--r--
git-grep.html	29.02 KB	-rw-r--r--
git-grep.txt	7.55 KB	-rw-r--r--
git-gui.html	22.1 KB	-rw-r--r--
git-gui.txt	3.5 KB	-rw-r--r--
git-hash-object.html	18.92 KB	-rw-r--r--
git-hash-object.txt	1.8 KB	-rw-r--r--
git-help.html	25.14 KB	-rw-r--r--
git-help.txt	5.99 KB	-rw-r--r--
git-http-backend.html	28.46 KB	-rw-r--r--
git-http-backend.txt	9.48 KB	-rw-r--r--
git-http-fetch.html	18.41 KB	-rw-r--r--
git-http-fetch.txt	1.14 KB	-rw-r--r--
git-http-push.html	20.73 KB	-rw-r--r--
git-http-push.txt	2.91 KB	-rw-r--r--
git-imap-send.html	22.84 KB	-rw-r--r--
git-imap-send.txt	4.24 KB	-rw-r--r--
git-index-pack.html	21.01 KB	-rw-r--r--
git-index-pack.txt	3.32 KB	-rw-r--r--
git-init-db.html	16.95 KB	-rw-r--r--
git-init-db.txt	409 B	-rw-r--r--
git-init.html	23 KB	-rw-r--r--
git-init.txt	4.69 KB	-rw-r--r--
git-instaweb.html	20.06 KB	-rw-r--r--
git-instaweb.txt	2.25 KB	-rw-r--r--
git-log.html	111.87 KB	-rw-r--r--
git-log.txt	5.68 KB	-rw-r--r--
git-lost-found.html	18.83 KB	-rw-r--r--
git-lost-found.txt	1.69 KB	-rw-r--r--
git-ls-files.html	26.46 KB	-rw-r--r--
git-ls-files.txt	6.1 KB	-rw-r--r--
git-ls-remote.html	20.11 KB	-rw-r--r--
git-ls-remote.txt	2.54 KB	-rw-r--r--
git-ls-tree.html	21.06 KB	-rw-r--r--
git-ls-tree.txt	2.93 KB	-rw-r--r--
git-mailinfo.html	20.78 KB	-rw-r--r--
git-mailinfo.txt	3 KB	-rw-r--r--
git-mailsplit.html	18.52 KB	-rw-r--r--
git-mailsplit.txt	1.21 KB	-rw-r--r--
git-merge-base.html	23.17 KB	-rw-r--r--
git-merge-base.txt	4.32 KB	-rw-r--r--
git-merge-file.html	20.71 KB	-rw-r--r--
git-merge-file.txt	2.72 KB	-rw-r--r--
git-merge-index.html	19.88 KB	-rw-r--r--
git-merge-index.txt	2.39 KB	-rw-r--r--
git-merge-one-file.html	16.9 KB	-rw-r--r--
git-merge-one-file.txt	387 B	-rw-r--r--
git-merge-tree.html	17.32 KB	-rw-r--r--
git-merge-tree.txt	749 B	-rw-r--r--
git-merge.html	50.38 KB	-rw-r--r--
git-merge.txt	11.97 KB	-rw-r--r--
git-mergetool--lib.html	18.23 KB	-rw-r--r--
git-mergetool--lib.txt	1.18 KB	-rw-r--r--
git-mergetool.html	20.98 KB	-rw-r--r--
git-mergetool.txt	3.26 KB	-rw-r--r--
git-mktag.html	17.63 KB	-rw-r--r--
git-mktag.txt	806 B	-rw-r--r--
git-mktree.html	17.94 KB	-rw-r--r--
git-mktree.txt	1.05 KB	-rw-r--r--
git-mv.html	18.33 KB	-rw-r--r--
git-mv.txt	1.16 KB	-rw-r--r--
git-name-rev.html	19.17 KB	-rw-r--r--
git-name-rev.txt	1.68 KB	-rw-r--r--
git-notes.html	35.71 KB	-rw-r--r--
git-notes.txt	13.08 KB	-rw-r--r--
git-p4.html	44.35 KB	-rw-r--r--
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git-pack-objects.html	28.46 KB	-rw-r--r--
git-pack-objects.txt	8.86 KB	-rw-r--r--
git-pack-redundant.html	18.24 KB	-rw-r--r--
git-pack-redundant.txt	1.13 KB	-rw-r--r--
git-pack-refs.html	19.15 KB	-rw-r--r--
git-pack-refs.txt	2.06 KB	-rw-r--r--
git-parse-remote.html	16.97 KB	-rw-r--r--
git-parse-remote.txt	471 B	-rw-r--r--
git-patch-id.html	17.71 KB	-rw-r--r--
git-patch-id.txt	940 B	-rw-r--r--
git-peek-remote.html	18.03 KB	-rw-r--r--
git-peek-remote.txt	1.08 KB	-rw-r--r--
git-prune-packed.html	17.99 KB	-rw-r--r--
git-prune-packed.txt	935 B	-rw-r--r--
git-prune.html	19.57 KB	-rw-r--r--
git-prune.txt	1.76 KB	-rw-r--r--
git-pull.html	54.96 KB	-rw-r--r--
git-pull.txt	7.72 KB	-rw-r--r--
git-push.html	48.49 KB	-rw-r--r--
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git-quiltimport.html	18.4 KB	-rw-r--r--
git-quiltimport.txt	1.4 KB	-rw-r--r--
git-read-tree.html	38.05 KB	-rw-r--r--
git-read-tree.txt	16.36 KB	-rw-r--r--
git-rebase.html	57.88 KB	-rw-r--r--
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git-receive-pack.html	23.98 KB	-rw-r--r--
git-receive-pack.txt	5.48 KB	-rw-r--r--
git-reflog.html	20.86 KB	-rw-r--r--
git-reflog.txt	3.09 KB	-rw-r--r--
git-relink.html	17.41 KB	-rw-r--r--
git-relink.txt	649 B	-rw-r--r--
git-remote-ext.html	22.43 KB	-rw-r--r--
git-remote-ext.txt	3.93 KB	-rw-r--r--
git-remote-fd.html	19 KB	-rw-r--r--
git-remote-fd.txt	1.63 KB	-rw-r--r--
git-remote-helpers.html	16.45 KB	-rw-r--r--
git-remote-testgit.html	17.26 KB	-rw-r--r--
git-remote-testgit.txt	570 B	-rw-r--r--
git-remote.html	26.62 KB	-rw-r--r--
git-remote.txt	6.79 KB	-rw-r--r--
git-repack.html	22.99 KB	-rw-r--r--
git-repack.txt	4.52 KB	-rw-r--r--
git-replace.html	19.86 KB	-rw-r--r--
git-replace.txt	2.26 KB	-rw-r--r--
git-repo-config.html	16.85 KB	-rw-r--r--
git-repo-config.txt	324 B	-rw-r--r--
git-request-pull.html	17.41 KB	-rw-r--r--
git-request-pull.txt	528 B	-rw-r--r--
git-rerere.html	25.93 KB	-rw-r--r--
git-rerere.txt	7.29 KB	-rw-r--r--
git-reset.html	36.54 KB	-rw-r--r--
git-reset.txt	14.15 KB	-rw-r--r--
git-rev-list.html	73.64 KB	-rw-r--r--
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git-rev-parse.html	46.91 KB	-rw-r--r--
git-rev-parse.txt	10.03 KB	-rw-r--r--
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git-revert.txt	3.69 KB	-rw-r--r--
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git-send-email.html	36.99 KB	-rw-r--r--
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git-svn.html	73.85 KB	-rw-r--r--
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git-symbolic-ref.html	19.37 KB	-rw-r--r--
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git-tools.html	22.01 KB	-rw-r--r--
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gitcli.html	26.56 KB	-rw-r--r--
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gitcore-tutorial.html	99.92 KB	-rw-r--r--
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gitcredentials.html	24.45 KB	-rw-r--r--
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gitglossary.html	48.63 KB	-rw-r--r--
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gitignore.html	24.81 KB	-rw-r--r--
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gitk.html	21.61 KB	-rw-r--r--
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i18n.txt	2.16 KB	-rw-r--r--
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urls.txt	3.12 KB	-rw-r--r--
user-manual.html	264.08 KB	-rw-r--r--
user-manual.txt	170.67 KB	-rw-r--r--

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<body class="manpage">
<div id="header">
<h1>
git-bisect(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>git-bisect -
   Find by binary search the change that introduced a bug
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git bisect</em> &lt;subcommand&gt; &lt;options&gt;</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The command takes various subcommands, and different options depending
on the subcommand:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>git bisect help
git bisect start [--no-checkout] [&lt;bad&gt; [&lt;good&gt;...]] [--] [&lt;paths&gt;...]
git bisect bad [&lt;rev&gt;]
git bisect good [&lt;rev&gt;...]
git bisect skip [(&lt;rev&gt;|&lt;range&gt;)...]
git bisect reset [&lt;commit&gt;]
git bisect visualize
git bisect replay &lt;logfile&gt;
git bisect log
git bisect run &lt;cmd&gt;...</code></pre>
</div></div>
<div class="paragraph"><p>This command uses <em>git rev-list --bisect</em> 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></div>
<div class="sect2">
<h3 id="_getting_help">Getting help</h3>
<div class="paragraph"><p>Use "git bisect" to get a short usage description, and "git bisect
help" or "git bisect -h" to get a long usage description.</p></div>
</div>
<div class="sect2">
<h3 id="_basic_bisect_commands_start_bad_good">Basic bisect commands: start, bad, good</h3>
<div class="paragraph"><p>Using the Linux kernel tree as an example, basic use of the bisect
command is as follows:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ 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</code></pre>
</div></div>
<div class="paragraph"><p>When you have specified at least one bad and one good version, the
command bisects the revision tree and outputs something similar to
the following:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>Bisecting: 675 revisions left to test after this</code></pre>
</div></div>
<div class="paragraph"><p>The state in the middle of the set of revisions is then checked out.
You would now compile that kernel and boot it. If the booted kernel
works correctly, you would then issue the following command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect good                       # this one is good</code></pre>
</div></div>
<div class="paragraph"><p>The output of this command would be something similar to the following:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>Bisecting: 337 revisions left to test after this</code></pre>
</div></div>
<div class="paragraph"><p>You keep repeating this process, compiling the tree, testing it, and
depending on whether it is good or bad issuing the command "git bisect good"
or "git bisect bad" to ask for the next bisection.</p></div>
<div class="paragraph"><p>Eventually there will be no more revisions left to bisect, and you
will have been left with the first bad kernel revision in "refs/bisect/bad".</p></div>
</div>
<div class="sect2">
<h3 id="_bisect_reset">Bisect reset</h3>
<div class="paragraph"><p>After a bisect session, to clean up the bisection state and return to
the original HEAD (i.e., to quit bisecting), issue the following command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect reset</code></pre>
</div></div>
<div class="paragraph"><p>By default, this will return your tree to the commit that was checked
out before <code>git bisect start</code>.  (A new <code>git bisect start</code> will also do
that, as it cleans up the old bisection state.)</p></div>
<div class="paragraph"><p>With an optional argument, you can return to a different commit
instead:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect reset &lt;commit&gt;</code></pre>
</div></div>
<div class="paragraph"><p>For example, <code>git bisect reset HEAD</code> will leave you on the current
bisection commit and avoid switching commits at all, while <code>git bisect
reset bisect/bad</code> will check out the first bad revision.</p></div>
</div>
<div class="sect2">
<h3 id="_bisect_visualize">Bisect visualize</h3>
<div class="paragraph"><p>To see the currently remaining suspects in <em>gitk</em>, issue the following
command during the bisection process:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect visualize</code></pre>
</div></div>
<div class="paragraph"><p><code>view</code> may also be used as a synonym for <code>visualize</code>.</p></div>
<div class="paragraph"><p>If the <em>DISPLAY</em> environment variable is not set, <em>git log</em> is used
instead.  You can also give command line options such as <code>-p</code> and
<code>--stat</code>.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect view --stat</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_bisect_log_and_bisect_replay">Bisect log and bisect replay</h3>
<div class="paragraph"><p>After having marked revisions as good or bad, issue the following
command to show what has been done so far:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect log</code></pre>
</div></div>
<div class="paragraph"><p>If you discover that you made a mistake in specifying the status of a
revision, you can save the output of this command to a file, edit it to
remove the incorrect entries, and then issue the following commands to
return to a corrected state:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect reset
$ git bisect replay that-file</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_avoiding_testing_a_commit">Avoiding testing a commit</h3>
<div class="paragraph"><p>If, in the middle of a bisect session, you know that the next suggested
revision 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 nearby commit and try that instead.</p></div>
<div class="paragraph"><p>For example:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect good/bad                   # previous round was good or bad.
Bisecting: 337 revisions left to test after this
$ git bisect visualize                  # oops, that is uninteresting.
$ git reset --hard HEAD~3               # try 3 revisions before what
                                        # was suggested</code></pre>
</div></div>
<div class="paragraph"><p>Then compile and test the chosen revision, and afterwards mark
the revision as good or bad in the usual manner.</p></div>
</div>
<div class="sect2">
<h3 id="_bisect_skip">Bisect skip</h3>
<div class="paragraph"><p>Instead of choosing by yourself a nearby commit, you can ask Git
to do it for you by issuing the command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect skip                 # Current version cannot be tested</code></pre>
</div></div>
<div class="paragraph"><p>But Git may eventually be unable to tell the first bad commit among
a bad commit and one or more skipped commits.</p></div>
<div class="paragraph"><p>You can even skip a range of commits, instead of just one commit,
using the "<em>&lt;commit1&gt;</em>..<em>&lt;commit2&gt;</em>" notation. For example:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect skip v2.5..v2.6</code></pre>
</div></div>
<div class="paragraph"><p>This tells the bisect process that no commit after <code>v2.5</code>, up to and
including <code>v2.6</code>, should be tested.</p></div>
<div class="paragraph"><p>Note that if you also want to skip the first commit of the range you
would issue the command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect skip v2.5 v2.5..v2.6</code></pre>
</div></div>
<div class="paragraph"><p>This tells the bisect process that the commits between <code>v2.5</code> included
and <code>v2.6</code> included should be skipped.</p></div>
</div>
<div class="sect2">
<h3 id="_cutting_down_bisection_by_giving_more_parameters_to_bisect_start">Cutting down bisection by giving more parameters to bisect start</h3>
<div class="paragraph"><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 specifying
path parameters when issuing the <code>bisect start</code> command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect start -- arch/i386 include/asm-i386</code></pre>
</div></div>
<div class="paragraph"><p>If you know beforehand more than one good commit, you can narrow the
bisect space down by specifying all of the good commits immediately after
the bad commit when issuing the <code>bisect start</code> command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect start v2.6.20-rc6 v2.6.20-rc4 v2.6.20-rc1 --
                   # v2.6.20-rc6 is bad
                   # v2.6.20-rc4 and v2.6.20-rc1 are good</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_bisect_run">Bisect run</h3>
<div class="paragraph"><p>If you have a script that can tell if the current source code is good
or bad, you can bisect by issuing the command:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect run my_script arguments</code></pre>
</div></div>
<div class="paragraph"><p>Note that the script (<code>my_script</code> in the above example) should
exit with code 0 if the current source code is good, and exit with a
code between 1 and 127 (inclusive), except 125, if the current
source code is bad.</p></div>
<div class="paragraph"><p>Any other exit code will abort the bisect process. It should be noted
that a program that terminates via "exit(-1)" leaves $? = 255, (see the
exit(3) manual page), as the value is chopped with "&amp; 0377".</p></div>
<div class="paragraph"><p>The special exit code 125 should be used when the current source code
cannot be tested. If the script exits with this code, the current
revision will be skipped (see <code>git bisect skip</code> above). 125 was chosen
as the highest sensible value to use for this purpose, because 126 and 127
are used by POSIX shells to signal specific error status (127 is for
command not found, 126 is for command found but not executable---these
details do not matter, as they are normal errors in the script, as far as
"bisect run" is concerned).</p></div>
<div class="paragraph"><p>You may often find that during a bisect session you want to have
temporary modifications (e.g. s/#define DEBUG 0/#define DEBUG 1/ in a
header file, or "revision that does not have this commit needs this
patch applied to work around another problem this bisection is not
interested in") applied to the revision being tested.</p></div>
<div class="paragraph"><p>To cope with such a situation, after the inner <em>git bisect</em> finds the
next revision to test, the script can apply the patch
before compiling, run the real test, and afterwards decide if the
revision (possibly with the needed patch) passed the test and then
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.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
--no-checkout
</dt>
<dd>
<div class="paragraph"><p>Do not checkout the new working tree at each iteration of the bisection
process. Instead just update a special reference named <em>BISECT_HEAD</em> to make
it point to the commit that should be tested.</p></div>
<div class="paragraph"><p>This option may be useful when the test you would perform in each step
does not require a checked out tree.</p></div>
<div class="paragraph"><p>If the repository is bare, <code>--no-checkout</code> is assumed.</p></div>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Automatically bisect a broken build between v1.2 and HEAD:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ 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</code></pre>
</div></div>
</li>
<li>
<p>
Automatically bisect a test failure between origin and HEAD:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ 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</code></pre>
</div></div>
</li>
<li>
<p>
Automatically bisect a broken test case:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ cat ~/test.sh
#!/bin/sh
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</code></pre>
</div></div>
<div class="paragraph"><p>Here we use a "test.sh" custom script. In this script, if "make"
fails, we skip the current commit.
"check_test_case.sh" should "exit 0" if the test case passes,
and "exit 1" otherwise.</p></div>
<div class="paragraph"><p>It is safer if both "test.sh" and "check_test_case.sh" are
outside the repository to prevent interactions between the bisect,
make and test processes and the scripts.</p></div>
</li>
<li>
<p>
Automatically bisect with temporary modifications (hot-fix):
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ cat ~/test.sh
#!/bin/sh

# tweak the working tree by merging the hot-fix branch
# and then attempt a build
if      git merge --no-commit hot-fix &amp;&amp;
        make
then
        # run project specific test and report its status
        ~/check_test_case.sh
        status=$?
else
        # tell the caller this is untestable
        status=125
fi

# undo the tweak to allow clean flipping to the next commit
git reset --hard

# return control
exit $status</code></pre>
</div></div>
<div class="paragraph"><p>This applies modifications from a hot-fix branch before each test run,
e.g. in case your build or test environment changed so that older
revisions may need a fix which newer ones have already. (Make sure the
hot-fix branch is based off a commit which is contained in all revisions
which you are bisecting, so that the merge does not pull in too much, or
use <code>git cherry-pick</code> instead of <code>git merge</code>.)</p></div>
</li>
<li>
<p>
Automatically bisect a broken test case:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ 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</code></pre>
</div></div>
<div class="paragraph"><p>This shows that you can do without a run script if you write the test
on a single line.</p></div>
</li>
<li>
<p>
Locate a good region of the object graph in a damaged repository
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git bisect start HEAD &lt;known-good-commit&gt; [ &lt;boundary-commit&gt; ... ] --no-checkout
$ git bisect run sh -c '
        GOOD=$(git for-each-ref "--format=%(objectname)" refs/bisect/good-*) &amp;&amp;
        git rev-list --objects BISECT_HEAD --not $GOOD &gt;tmp.$$ &amp;&amp;
        git pack-objects --stdout &gt;/dev/null &lt;tmp.$$
        rc=$?
        rm -f tmp.$$
        test $rc = 0'

$ git bisect reset                   # quit the bisect session</code></pre>
</div></div>
<div class="paragraph"><p>In this case, when <em>git bisect run</em> 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 <em>git pack objects</em>.</p></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="git-bisect-lk2009.html">Fighting regressions with git bisect</a>,
<a href="git-blame.html">git-blame(1)</a>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
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