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Linux 2.6 - man page for git-fsck (linux section 1)

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

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

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

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

	   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.

	   Print out objects that exist but that aren't reachable from any of the reference

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

	   Report root nodes.

	   Report tags.

	   Consider any object recorded in the index also as a head node for an unreachability

	   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.

	   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.

	   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.

	   Be chatty.

	   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.

	   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

       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).

       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.

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

	   used to specify the index file of the index

	   used to specify additional object database roots (usually unset)

       Part of the git(1) suite

Git				    01/14/2014				      GIT-FSCK(1)

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