NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DISCUSSION | EXTRACTED DIAGNOSTICS | ENVIRONMENT VARIABLES | GIT | COLOPHON

GIT-FSCK(1)                      Git Manual                      GIT-FSCK(1)

NAME         top

       git-fsck - Verifies the connectivity and validity of the objects in
       the database

SYNOPSIS         top

       git fsck [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]
                [--[no-]full] [--strict] [--verbose] [--lost-found]
                [--[no-]dangling] [--[no-]progress] [--connectivity-only]
                [--[no-]name-objects] [<object>*]

DESCRIPTION         top

       Verifies the connectivity and validity of the objects in the
       database.

OPTIONS         top

       <object>
           An object to treat as the head of an unreachability trace.

           If no objects are given, git fsck defaults to using the index
           file, all SHA-1 references in refs namespace, and all reflogs
           (unless --no-reflogs is given) as heads.

       --unreachable
           Print out objects that exist but that aren’t reachable from any
           of the reference nodes.

       --[no-]dangling
           Print objects that exist but that are never directly used
           (default).  --no-dangling can be used to omit this information
           from the output.

       --root
           Report root nodes.

       --tags
           Report tags.

       --cache
           Consider any object recorded in the index also as a head node for
           an unreachability trace.

       --no-reflogs
           Do not consider commits that are referenced only by an entry in a
           reflog to be reachable. This option is meant only to search for
           commits that used to be in a ref, but now aren’t, but are still
           in that corresponding reflog.

       --full
           Check not just objects in GIT_OBJECT_DIRECTORY
           ($GIT_DIR/objects), but also the ones found in alternate object
           pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES or
           $GIT_DIR/objects/info/alternates, and in packed Git archives
           found in $GIT_DIR/objects/pack and corresponding pack
           subdirectories in alternate object pools. This is now default;
           you can turn it off with --no-full.

       --connectivity-only
           Check only the connectivity of tags, commits and tree objects. By
           avoiding to unpack blobs, this speeds up the operation, at the
           expense of missing corrupt objects or other problematic issues.

       --strict
           Enable more strict checking, namely to catch a file mode recorded
           with g+w bit set, which was created by older versions of Git.
           Existing repositories, including the Linux kernel, Git itself,
           and sparse repository have old objects that triggers this check,
           but it is recommended to check new projects with this flag.

       --verbose
           Be chatty.

       --lost-found
           Write dangling objects into .git/lost-found/commit/ or
           .git/lost-found/other/, depending on type. If the object is a
           blob, the contents are written into the file, rather than its
           object name.

       --name-objects
           When displaying names of reachable objects, in addition to the
           SHA-1 also display a name that describes how they are reachable,
           compatible with git-rev-parse(1), e.g.
           HEAD@{1234567890}~25^2:src/.

       --[no-]progress
           Progress status is reported on the standard error stream by
           default when it is attached to a terminal, unless --no-progress
           or --verbose is specified. --progress forces progress status even
           if the standard error stream is not directed to a terminal.

DISCUSSION         top

       git-fsck tests SHA-1 and general object sanity, and it does full
       tracking of the resulting reachability and everything else. It prints
       out any corruption it finds (missing or bad objects), and if you use
       the --unreachable flag it will also print out objects that exist but
       that aren’t reachable from any of the specified head nodes (or the
       default set, as mentioned above).

       Any corrupt objects you will have to find in backups or other
       archives (i.e., you can just remove them and do an rsync with some
       other site in the hopes that somebody else has the object you have
       corrupted).

EXTRACTED DIAGNOSTICS         top

       expect dangling commits - potential heads - due to lack of head
       information
           You haven’t specified any nodes as heads so it won’t be possible
           to differentiate between un-parented commits and root nodes.

       missing sha1 directory <dir>
           The directory holding the sha1 objects is missing.

       unreachable <type> <object>
           The <type> object <object>, isn’t actually referred to directly
           or indirectly in any of the trees or commits seen. This can mean
           that there’s another root node that you’re not specifying or that
           the tree is corrupt. If you haven’t missed a root node then you
           might as well delete unreachable nodes since they can’t be used.

       missing <type> <object>
           The <type> object <object>, is referred to but isn’t present in
           the database.

       dangling <type> <object>
           The <type> object <object>, is present in the database but never
           directly used. A dangling commit could be a root node.

       sha1 mismatch <object>
           The database has an object who’s sha1 doesn’t match the database
           value. This indicates a serious data integrity problem.

ENVIRONMENT VARIABLES         top

       GIT_OBJECT_DIRECTORY
           used to specify the object database root (usually
           $GIT_DIR/objects)

       GIT_INDEX_FILE
           used to specify the index file of the index

       GIT_ALTERNATE_OBJECT_DIRECTORIES
           used to specify additional object database roots (usually unset)

GIT         top

       Part of the git(1) suite

COLOPHON         top

       This page is part of the git (Git distributed version control system)
       project.  Information about the project can be found at 
       ⟨http://git-scm.com/⟩.  If you have a bug report for this manual page,
       see ⟨http://git-scm.com/community⟩.  This page was obtained from the
       project's upstream Git repository ⟨https://github.com/git/git.git⟩ on
       2017-07-05.  If you discover any rendering problems in this HTML ver‐
       sion of the page, or you believe there is a better or more up-to-date
       source for the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original man‐
       ual page), send a mail to man-pages@man7.org

Git 2.9.2.574.gc6b0597           08/07/2016                      GIT-FSCK(1)

Pages that refer to this page: git(1)git-fsck-objects(1)git-prune(1)