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git-fsck(1)
===========

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

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

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

OPTIONS
-------
<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.

--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.

--[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
----------

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
---------------------

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
---------------------

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
---
Part of the linkgit:git[1] suite

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