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 571 <div id="header">
 572 <h1>
 573 git-fsck(1) Manual Page
 574 </h1>
 575 <h2>NAME</h2>
 576 <div class="sectionbody">
 577 <p>git-fsck -
 578    Verifies the connectivity and validity of the objects in the database
 579 </p>
 580 </div>
 581 </div>
 582 <div id="content">
 583 <h2 id="_synopsis">SYNOPSIS</h2>
 584 <div class="sectionbody">
 585 <div class="verseblock">
 586 <div class="verseblock-content"><em>git fsck</em> [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]
 587          [--[no-]full] [--strict] [--verbose] [--lost-found] [&lt;object&gt;*]</div>
 588 <div class="verseblock-attribution">
 589 </div></div>
 590 </div>
 591 <h2 id="_description">DESCRIPTION</h2>
 592 <div class="sectionbody">
 593 <div class="paragraph"><p>Verifies the connectivity and validity of the objects in the database.</p></div>
 594 </div>
 595 <h2 id="_options">OPTIONS</h2>
 596 <div class="sectionbody">
 597 <div class="dlist"><dl>
 598 <dt class="hdlist1">
 599 &lt;object&gt;
 600 </dt>
 601 <dd>
 602 <p>
 603         An object to treat as the head of an unreachability trace.
 604 </p>
 605 <div class="paragraph"><p>If no objects are given, <em>git fsck</em> defaults to using the
 606 index file, all SHA1 references in .git/refs/*, and all reflogs (unless
 607 --no-reflogs is given) as heads.</p></div>
 608 </dd>
 609 <dt class="hdlist1">
 610 --unreachable
 611 </dt>
 612 <dd>
 613 <p>
 614         Print out objects that exist but that aren&#8217;t reachable from any
 615         of the reference nodes.
 616 </p>
 617 </dd>
 618 <dt class="hdlist1">
 619 --root
 620 </dt>
 621 <dd>
 622 <p>
 623         Report root nodes.
 624 </p>
 625 </dd>
 626 <dt class="hdlist1">
 627 --tags
 628 </dt>
 629 <dd>
 630 <p>
 631         Report tags.
 632 </p>
 633 </dd>
 634 <dt class="hdlist1">
 635 --cache
 636 </dt>
 637 <dd>
 638 <p>
 639         Consider any object recorded in the index also as a head node for
 640         an unreachability trace.
 641 </p>
 642 </dd>
 643 <dt class="hdlist1">
 644 --no-reflogs
 645 </dt>
 646 <dd>
 647 <p>
 648         Do not consider commits that are referenced only by an
 649         entry in a reflog to be reachable.  This option is meant
 650         only to search for commits that used to be in a ref, but
 651         now aren&#8217;t, but are still in that corresponding reflog.
 652 </p>
 653 </dd>
 654 <dt class="hdlist1">
 655 --full
 656 </dt>
 657 <dd>
 658 <p>
 659         Check not just objects in GIT_OBJECT_DIRECTORY
 660         ($GIT_DIR/objects), but also the ones found in alternate
 661         object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES
 662         or $GIT_DIR/objects/info/alternates,
 663         and in packed git archives found in $GIT_DIR/objects/pack
 664         and corresponding pack subdirectories in alternate
 665         object pools.  This is now default; you can turn it off
 666         with --no-full.
 667 </p>
 668 </dd>
 669 <dt class="hdlist1">
 670 --strict
 671 </dt>
 672 <dd>
 673 <p>
 674         Enable more strict checking, namely to catch a file mode
 675         recorded with g+w bit set, which was created by older
 676         versions of git.  Existing repositories, including the
 677         Linux kernel, git itself, and sparse repository have old
 678         objects that triggers this check, but it is recommended
 679         to check new projects with this flag.
 680 </p>
 681 </dd>
 682 <dt class="hdlist1">
 683 --verbose
 684 </dt>
 685 <dd>
 686 <p>
 687         Be chatty.
 688 </p>
 689 </dd>
 690 <dt class="hdlist1">
 691 --lost-found
 692 </dt>
 693 <dd>
 694 <p>
 695         Write dangling objects into .git/lost-found/commit/ or
 696         .git/lost-found/other/, depending on type.  If the object is
 697         a blob, the contents are written into the file, rather than
 698         its object name.
 699 </p>
 700 </dd>
 701 </dl></div>
 702 <div class="paragraph"><p>It tests SHA1 and general object sanity, and it does full tracking of
 703 the resulting reachability and everything else. It prints out any
 704 corruption it finds (missing or bad objects), and if you use the
 705 <em>--unreachable</em> flag it will also print out objects that exist but
 706 that aren&#8217;t reachable from any of the specified head nodes.</p></div>
 707 <div class="paragraph"><p>So for example</p></div>
 708 <div class="literalblock">
 709 <div class="content">
 710 <pre><tt>git fsck --unreachable HEAD \
 711         $(git for-each-ref --format="%(objectname)" refs/heads)</tt></pre>
 712 </div></div>
 713 <div class="paragraph"><p>will do quite a <em>lot</em> of verification on the tree. There are a few
 714 extra validity tests to be added (make sure that tree objects are
 715 sorted properly etc), but on the whole if <em>git fsck</em> is happy, you
 716 do have a valid tree.</p></div>
 717 <div class="paragraph"><p>Any corrupt objects you will have to find in backups or other archives
 718 (i.e., you can just remove them and do an <em>rsync</em> with some other site in
 719 the hopes that somebody else has the object you have corrupted).</p></div>
 720 <div class="paragraph"><p>Of course, "valid tree" doesn&#8217;t mean that it wasn&#8217;t generated by some
 721 evil person, and the end result might be crap. git is a revision
 722 tracking system, not a quality assurance system ;)</p></div>
 723 </div>
 724 <h2 id="_extracted_diagnostics">Extracted Diagnostics</h2>
 725 <div class="sectionbody">
 726 <div class="dlist"><dl>
 727 <dt class="hdlist1">
 728 expect dangling commits - potential heads - due to lack of head information
 729 </dt>
 730 <dd>
 731 <p>
 732         You haven&#8217;t specified any nodes as heads so it won&#8217;t be
 733         possible to differentiate between un-parented commits and
 734         root nodes.
 735 </p>
 736 </dd>
 737 <dt class="hdlist1">
 738 missing sha1 directory <em>&lt;dir&gt;</em>
 739 </dt>
 740 <dd>
 741 <p>
 742         The directory holding the sha1 objects is missing.
 743 </p>
 744 </dd>
 745 <dt class="hdlist1">
 746 unreachable &lt;type&gt; &lt;object&gt;
 747 </dt>
 748 <dd>
 749 <p>
 750         The &lt;type&gt; object &lt;object&gt;, isn&#8217;t actually referred to directly
 751         or indirectly in any of the trees or commits seen. This can
 752         mean that there&#8217;s another root node that you&#8217;re not specifying
 753         or that the tree is corrupt. If you haven&#8217;t missed a root node
 754         then you might as well delete unreachable nodes since they
 755         can&#8217;t be used.
 756 </p>
 757 </dd>
 758 <dt class="hdlist1">
 759 missing &lt;type&gt; &lt;object&gt;
 760 </dt>
 761 <dd>
 762 <p>
 763         The &lt;type&gt; object &lt;object&gt;, is referred to but isn&#8217;t present in
 764         the database.
 765 </p>
 766 </dd>
 767 <dt class="hdlist1">
 768 dangling &lt;type&gt; &lt;object&gt;
 769 </dt>
 770 <dd>
 771 <p>
 772         The &lt;type&gt; object &lt;object&gt;, is present in the database but never
 773         <em>directly</em> used. A dangling commit could be a root node.
 774 </p>
 775 </dd>
 776 <dt class="hdlist1">
 777 sha1 mismatch &lt;object&gt;
 778 </dt>
 779 <dd>
 780 <p>
 781         The database has an object who&#8217;s sha1 doesn&#8217;t match the
 782         database value.
 783         This indicates a serious data integrity problem.
 784 </p>
 785 </dd>
 786 </dl></div>
 787 </div>
 788 <h2 id="_environment_variables">Environment Variables</h2>
 789 <div class="sectionbody">
 790 <div class="dlist"><dl>
 791 <dt class="hdlist1">
 792 GIT_OBJECT_DIRECTORY
 793 </dt>
 794 <dd>
 795 <p>
 796         used to specify the object database root (usually $GIT_DIR/objects)
 797 </p>
 798 </dd>
 799 <dt class="hdlist1">
 800 GIT_INDEX_FILE
 801 </dt>
 802 <dd>
 803 <p>
 804         used to specify the index file of the index
 805 </p>
 806 </dd>
 807 <dt class="hdlist1">
 808 GIT_ALTERNATE_OBJECT_DIRECTORIES
 809 </dt>
 810 <dd>
 811 <p>
 812         used to specify additional object database roots (usually unset)
 813 </p>
 814 </dd>
 815 </dl></div>
 816 </div>
 817 <h2 id="_git">GIT</h2>
 818 <div class="sectionbody">
 819 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 820 </div>
 821 </div>
 822 <div id="footnotes"><hr /></div>
 823 <div id="footer">
 824 <div id="footer-text">
 825 Last updated 2011-09-21 23:01:14 PDT
 826 </div>
 827 </div>
 828 </body>
 829 </html>