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

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

SYNOPSIS
       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
       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.

       --connectivity-only
	   Check only the connectivity of reachable objects, making sure that
	   any objects referenced by a reachable tag, commit, or tree is
	   present. This speeds	up the operation by avoiding reading blobs
	   entirely (though it does still check	that referenced	blobs exist).
	   This	will detect corruption in commits and trees, but not do	any
	   semantic checks (e.g., for format errors). Corruption in blob
	   objects will	not be detected	at all.

	   Unreachable tags, commits, and trees	will also be accessed to find
	   the tips of dangling	segments of history. Use --no-dangling if you
	   don't care about this output	and want to speed it up	further.

       --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.

CONFIGURATION
       fsck.<msg-id>
	   During fsck git may find issues with	legacy data which wouldn't be
	   generated by	current	versions of git, and which wouldn't be sent
	   over	the wire if transfer.fsckObjects was set. This feature is
	   intended to support working with legacy repositories	containing
	   such	data.

	   Setting fsck.<msg-id> will be picked	up by git-fsck(1), but to
	   accept pushes of such data set receive.fsck.<msg-id>	instead, or to
	   clone or fetch it set fetch.fsck.<msg-id>.

	   The rest of the documentation discusses fsck.*  for brevity,	but
	   the same applies for	the corresponding receive.fsck.*  and
	   fetch.<msg-id>.*. variables.

	   Unlike variables like color.ui and core.editor the
	   receive.fsck.<msg-id> and fetch.fsck.<msg-id> variables will	not
	   fall	back on	the fsck.<msg-id> configuration	if they	aren't set. To
	   uniformly configure the same	fsck settings in different
	   circumstances all three of them they	must all set to	the same
	   values.

	   When	fsck.<msg-id> is set, errors can be switched to	warnings and
	   vice	versa by configuring the fsck.<msg-id> setting where the
	   <msg-id> is the fsck	message	ID and the value is one	of error, warn
	   or ignore. For convenience, fsck prefixes the error/warning with
	   the message ID, e.g.	"missingEmail: invalid author/committer	line -
	   missing email" means	that setting fsck.missingEmail = ignore	will
	   hide	that issue.

	   In general, it is better to enumerate existing objects with
	   problems with fsck.skipList,	instead	of listing the kind of
	   breakages these problematic objects share to	be ignored, as doing
	   the latter will allow new instances of the same breakages go
	   unnoticed.

	   Setting an unknown fsck.<msg-id> value will cause fsck to die, but
	   doing the same for receive.fsck.<msg-id> and	fetch.fsck.<msg-id>
	   will	only cause git to warn.

       fsck.skipList
	   The path to a list of object	names (i.e. one	unabbreviated SHA-1
	   per line) that are known to be broken in a non-fatal	way and	should
	   be ignored. On versions of Git 2.20 and later comments (#), empty
	   lines, and any leading and trailing whitespace is ignored.
	   Everything but a SHA-1 per line will	error out on older versions.

	   This	feature	is useful when an established project should be
	   accepted despite early commits containing errors that can be	safely
	   ignored such	as invalid committer email addresses. Note: corrupt
	   objects cannot be skipped with this setting.

	   Like	fsck.<msg-id> this variable has	corresponding
	   receive.fsck.skipList and fetch.fsck.skipList variants.

	   Unlike variables like color.ui and core.editor the
	   receive.fsck.skipList and fetch.fsck.skipList variables will	not
	   fall	back on	the fsck.skipList configuration	if they	aren't set. To
	   uniformly configure the same	fsck settings in different
	   circumstances all three of them they	must all set to	the same
	   values.

	   Older versions of Git (before 2.20) documented that the object
	   names list should be	sorted.	This was never a requirement, the
	   object names	could appear in	any order, but when reading the	list
	   we tracked whether the list was sorted for the purposes of an
	   internal binary search implementation, which	could save itself some
	   work	with an	already	sorted list. Unless you	had a humongous	list
	   there was no	reason to go out of your way to	pre-sort the list.
	   After Git version 2.20 a hash implementation	is used	instead, so
	   there's now no reason to pre-sort the list.

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).

       If core.commitGraph is true, the	commit-graph file will also be
       inspected using git commit-graph	verify.	See git-commit-graph(1).

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.

       hash mismatch <object>
	   The database	has an object whose hash doesn't match the object
	   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 git(1) suite

Git 2.28.0			  07/26/2020			   GIT-FSCK(1)

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

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