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259 <title>git-fsck-objects(1)</title>
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264 git-fsck-objects(1) Manual Page
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267 <div class="sectionbody">
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268 <p>git-fsck-objects -
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269 Verifies the connectivity and validity of the objects in the database
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274 <div class="sectionbody">
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275 <div class="verseblock">
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276 <div class="content"><em>git-fsck-objects</em> [--tags] [--root] [--unreachable] [--cache]
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277 [--full] [--strict] [<object>*]</div></div>
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279 <h2>DESCRIPTION</h2>
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280 <div class="sectionbody">
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281 <p>Verifies the connectivity and validity of the objects in the database.</p>
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284 <div class="sectionbody">
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291 An object to treat as the head of an unreachability trace.
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293 <p>If no objects are given, git-fsck-objects defaults to using the
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294 index file and all SHA1 references in .git/refs/* as heads.</p>
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301 Print out objects that exist but that aren't readable from any
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302 of the reference nodes.
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326 Consider any object recorded in the index also as a head node for
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327 an unreachability trace.
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335 Check not just objects in GIT_OBJECT_DIRECTORY
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336 ($GIT_DIR/objects), but also the ones found in alternate
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337 object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES
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338 or $GIT_DIR/objects/info/alternates,
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339 and in packed git archives found in $GIT_DIR/objects/pack
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340 and corresponding pack subdirectories in alternate
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349 Enable more strict checking, namely to catch a file mode
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350 recorded with g+w bit set, which was created by older
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351 versions of git. Existing repositories, including the
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352 Linux kernel, git itself, and sparse repository have old
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353 objects that triggers this check, but it is recommended
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354 to check new projects with this flag.
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358 <p>It tests SHA1 and general object sanity, and it does full tracking of
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359 the resulting reachability and everything else. It prints out any
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360 corruption it finds (missing or bad objects), and if you use the
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361 <em>--unreachable</em> flag it will also print out objects that exist but
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362 that aren't readable from any of the specified head nodes.</p>
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363 <p>So for example</p>
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364 <div class="literalblock">
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365 <div class="content">
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366 <pre><tt>git-fsck-objects --unreachable HEAD $(cat .git/refs/heads/*)</tt></pre>
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368 <p>will do quite a _lot_ of verification on the tree. There are a few
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369 extra validity tests to be added (make sure that tree objects are
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370 sorted properly etc), but on the whole if "git-fsck-objects" is happy, you
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371 do have a valid tree.</p>
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372 <p>Any corrupt objects you will have to find in backups or other archives
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373 (ie you can just remove them and do an "rsync" with some other site in
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374 the hopes that somebody else has the object you have corrupted).</p>
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375 <p>Of course, "valid tree" doesn't mean that it wasn't generated by some
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376 evil person, and the end result might be crap. git is a revision
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377 tracking system, not a quality assurance system ;)</p>
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379 <h2>Extracted Diagnostics</h2>
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380 <div class="sectionbody">
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383 expect dangling commits - potential heads - due to lack of head information
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387 You haven't specified any nodes as heads so it won't be
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388 possible to differentiate between un-parented commits and
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393 missing sha1 directory <em><dir></em>
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397 The directory holding the sha1 objects is missing.
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401 unreachable <type> <object>
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405 The <type> object <object>, isn't actually referred to directly
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406 or indirectly in any of the trees or commits seen. This can
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407 mean that there's another root node that you're not specifying
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408 or that the tree is corrupt. If you haven't missed a root node
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409 then you might as well delete unreachable nodes since they
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414 missing <type> <object>
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418 The <type> object <object>, is referred to but isn't present in
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423 dangling <type> <object>
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427 The <type> object <object>, is present in the database but never
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428 <em>directly</em> used. A dangling commit could be a root node.
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432 warning: git-fsck-objects: tree <tree> has full pathnames in it
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436 And it shouldn't…
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440 sha1 mismatch <object>
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444 The database has an object who's sha1 doesn't match the
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446 This indicates a serious data integrity problem.
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451 <h2>Environment Variables</h2>
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452 <div class="sectionbody">
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455 GIT_OBJECT_DIRECTORY
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459 used to specify the object database root (usually $GIT_DIR/objects)
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467 used to specify the index file of the index
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471 GIT_ALTERNATE_OBJECT_DIRECTORIES
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475 used to specify additional object database roots (usually unset)
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481 <div class="sectionbody">
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482 <p>Written by Linus Torvalds <torvalds@osdl.org></p>
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484 <h2>Documentation</h2>
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485 <div class="sectionbody">
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486 <p>Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.</p>
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489 <div class="sectionbody">
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490 <p>Part of the <a href="git.html">git(7)</a> suite</p>
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493 <div id="footer-text">
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494 Last updated 13-Mar-2006 08:20:13 UTC
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