git-fsck.html

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 306 </style>
 307 <title>git-fsck(1)</title>
 308 </head>
 309 <body>
 310 <div id="header">
 311 <h1>
 312 git-fsck(1) Manual Page
 313 </h1>
 314 <h2>NAME</h2>
 315 <div class="sectionbody">
 316 <p>git-fsck -
 317    Verifies the connectivity and validity of the objects in the database
 318 </p>
 319 </div>
 320 </div>
 321 <h2>SYNOPSIS</h2>
 322 <div class="sectionbody">
 323 <div class="verseblock">
 324 <div class="content"><em>git fsck</em> [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]
 325          [--[no-]full] [--strict] [--verbose] [--lost-found] [&lt;object&gt;*]</div></div>
 326 </div>
 327 <h2 id="_description">DESCRIPTION</h2>
 328 <div class="sectionbody">
 329 <div class="para"><p>Verifies the connectivity and validity of the objects in the database.</p></div>
 330 </div>
 331 <h2 id="_options">OPTIONS</h2>
 332 <div class="sectionbody">
 333 <div class="vlist"><dl>
 334 <dt>
 335 &lt;object&gt;
 336 </dt>
 337 <dd>
 338 <p>
 339         An object to treat as the head of an unreachability trace.
 340 </p>
 341 <div class="para"><p>If no objects are given, <em>git fsck</em> defaults to using the
 342 index file, all SHA1 references in .git/refs/*, and all reflogs (unless
 343 --no-reflogs is given) as heads.</p></div>
 344 </dd>
 345 <dt>
 346 --unreachable
 347 </dt>
 348 <dd>
 349 <p>
 350         Print out objects that exist but that aren't readable from any
 351         of the reference nodes.
 352 </p>
 353 </dd>
 354 <dt>
 355 --root
 356 </dt>
 357 <dd>
 358 <p>
 359         Report root nodes.
 360 </p>
 361 </dd>
 362 <dt>
 363 --tags
 364 </dt>
 365 <dd>
 366 <p>
 367         Report tags.
 368 </p>
 369 </dd>
 370 <dt>
 371 --cache
 372 </dt>
 373 <dd>
 374 <p>
 375         Consider any object recorded in the index also as a head node for
 376         an unreachability trace.
 377 </p>
 378 </dd>
 379 <dt>
 380 --no-reflogs
 381 </dt>
 382 <dd>
 383 <p>
 384         Do not consider commits that are referenced only by an
 385         entry in a reflog to be reachable.  This option is meant
 386         only to search for commits that used to be in a ref, but
 387         now aren't, but are still in that corresponding reflog.
 388 </p>
 389 </dd>
 390 <dt>
 391 --full
 392 </dt>
 393 <dd>
 394 <p>
 395         Check not just objects in GIT_OBJECT_DIRECTORY
 396         ($GIT_DIR/objects), but also the ones found in alternate
 397         object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES
 398         or $GIT_DIR/objects/info/alternates,
 399         and in packed git archives found in $GIT_DIR/objects/pack
 400         and corresponding pack subdirectories in alternate
 401         object pools.  This is now default; you can turn it off
 402         with --no-full.
 403 </p>
 404 </dd>
 405 <dt>
 406 --strict
 407 </dt>
 408 <dd>
 409 <p>
 410         Enable more strict checking, namely to catch a file mode
 411         recorded with g+w bit set, which was created by older
 412         versions of git.  Existing repositories, including the
 413         Linux kernel, git itself, and sparse repository have old
 414         objects that triggers this check, but it is recommended
 415         to check new projects with this flag.
 416 </p>
 417 </dd>
 418 <dt>
 419 --verbose
 420 </dt>
 421 <dd>
 422 <p>
 423         Be chatty.
 424 </p>
 425 </dd>
 426 <dt>
 427 --lost-found
 428 </dt>
 429 <dd>
 430 <p>
 431         Write dangling objects into .git/lost-found/commit/ or
 432         .git/lost-found/other/, depending on type.  If the object is
 433         a blob, the contents are written into the file, rather than
 434         its object name.
 435 </p>
 436 </dd>
 437 </dl></div>
 438 <div class="para"><p>It tests SHA1 and general object sanity, and it does full tracking of
 439 the resulting reachability and everything else. It prints out any
 440 corruption it finds (missing or bad objects), and if you use the
 441 <em>--unreachable</em> flag it will also print out objects that exist but
 442 that aren't readable from any of the specified head nodes.</p></div>
 443 <div class="para"><p>So for example</p></div>
 444 <div class="literalblock">
 445 <div class="content">
 446 <pre><tt>git fsck --unreachable HEAD \
 447         $(git for-each-ref --format="%(objectname)" refs/heads)</tt></pre>
 448 </div></div>
 449 <div class="para"><p>will do quite a _lot_ of verification on the tree. There are a few
 450 extra validity tests to be added (make sure that tree objects are
 451 sorted properly etc), but on the whole if <em>git fsck</em> is happy, you
 452 do have a valid tree.</p></div>
 453 <div class="para"><p>Any corrupt objects you will have to find in backups or other archives
 454 (i.e., you can just remove them and do an <em>rsync</em> with some other site in
 455 the hopes that somebody else has the object you have corrupted).</p></div>
 456 <div class="para"><p>Of course, "valid tree" doesn't mean that it wasn't generated by some
 457 evil person, and the end result might be crap. git is a revision
 458 tracking system, not a quality assurance system ;)</p></div>
 459 </div>
 460 <h2 id="_extracted_diagnostics">Extracted Diagnostics</h2>
 461 <div class="sectionbody">
 462 <div class="vlist"><dl>
 463 <dt>
 464 expect dangling commits - potential heads - due to lack of head information
 465 </dt>
 466 <dd>
 467 <p>
 468         You haven't specified any nodes as heads so it won't be
 469         possible to differentiate between un-parented commits and
 470         root nodes.
 471 </p>
 472 </dd>
 473 <dt>
 474 missing sha1 directory <em>&lt;dir&gt;</em>
 475 </dt>
 476 <dd>
 477 <p>
 478         The directory holding the sha1 objects is missing.
 479 </p>
 480 </dd>
 481 <dt>
 482 unreachable &lt;type&gt; &lt;object&gt;
 483 </dt>
 484 <dd>
 485 <p>
 486         The &lt;type&gt; object &lt;object&gt;, isn't actually referred to directly
 487         or indirectly in any of the trees or commits seen. This can
 488         mean that there's another root node that you're not specifying
 489         or that the tree is corrupt. If you haven't missed a root node
 490         then you might as well delete unreachable nodes since they
 491         can't be used.
 492 </p>
 493 </dd>
 494 <dt>
 495 missing &lt;type&gt; &lt;object&gt;
 496 </dt>
 497 <dd>
 498 <p>
 499         The &lt;type&gt; object &lt;object&gt;, is referred to but isn't present in
 500         the database.
 501 </p>
 502 </dd>
 503 <dt>
 504 dangling &lt;type&gt; &lt;object&gt;
 505 </dt>
 506 <dd>
 507 <p>
 508         The &lt;type&gt; object &lt;object&gt;, is present in the database but never
 509         <em>directly</em> used. A dangling commit could be a root node.
 510 </p>
 511 </dd>
 512 <dt>
 513 warning: git-fsck: tree &lt;tree&gt; has full pathnames in it
 514 </dt>
 515 <dd>
 516 <p>
 517         And it shouldn't&#8230;
 518 </p>
 519 </dd>
 520 <dt>
 521 sha1 mismatch &lt;object&gt;
 522 </dt>
 523 <dd>
 524 <p>
 525         The database has an object who's sha1 doesn't match the
 526         database value.
 527         This indicates a serious data integrity problem.
 528 </p>
 529 </dd>
 530 </dl></div>
 531 </div>
 532 <h2 id="_environment_variables">Environment Variables</h2>
 533 <div class="sectionbody">
 534 <div class="vlist"><dl>
 535 <dt>
 536 GIT_OBJECT_DIRECTORY
 537 </dt>
 538 <dd>
 539 <p>
 540         used to specify the object database root (usually $GIT_DIR/objects)
 541 </p>
 542 </dd>
 543 <dt>
 544 GIT_INDEX_FILE
 545 </dt>
 546 <dd>
 547 <p>
 548         used to specify the index file of the index
 549 </p>
 550 </dd>
 551 <dt>
 552 GIT_ALTERNATE_OBJECT_DIRECTORIES
 553 </dt>
 554 <dd>
 555 <p>
 556         used to specify additional object database roots (usually unset)
 557 </p>
 558 </dd>
 559 </dl></div>
 560 </div>
 561 <h2 id="_author">Author</h2>
 562 <div class="sectionbody">
 563 <div class="para"><p>Written by Linus Torvalds &lt;torvalds@osdl.org&gt;</p></div>
 564 </div>
 565 <h2 id="_documentation">Documentation</h2>
 566 <div class="sectionbody">
 567 <div class="para"><p>Documentation by David Greaves, Junio C Hamano and the git-list &lt;git@vger.kernel.org&gt;.</p></div>
 568 </div>
 569 <h2 id="_git">GIT</h2>
 570 <div class="sectionbody">
 571 <div class="para"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 572 </div>
 573 <div id="footer">
 574 <div id="footer-text">
 575 Last updated 2010-02-13 00:59:44 UTC
 576 </div>
 577 </div>
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