df805ed6cf
On reading this again, there are two things that were not immediately
clear to me:
- we do still check links to blobs, even though we don't open the
blobs themselves
- we do not do the normal fsck checks, even for non-blob objects we do
open
Let's reword it to make these points a little more clear.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
167 lines
5.4 KiB
Plaintext
167 lines
5.4 KiB
Plaintext
git-fsck(1)
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===========
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NAME
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----
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git-fsck - Verifies the connectivity and validity of the objects in the database
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SYNOPSIS
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--------
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[verse]
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'git fsck' [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]
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[--[no-]full] [--strict] [--verbose] [--lost-found]
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[--[no-]dangling] [--[no-]progress] [--connectivity-only]
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[--[no-]name-objects] [<object>*]
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DESCRIPTION
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-----------
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Verifies the connectivity and validity of the objects in the database.
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OPTIONS
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-------
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<object>::
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An object to treat as the head of an unreachability trace.
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+
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If no objects are given, 'git fsck' defaults to using the
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index file, all SHA-1 references in `refs` namespace, and all reflogs
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(unless --no-reflogs is given) as heads.
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--unreachable::
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Print out objects that exist but that aren't reachable from any
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of the reference nodes.
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--[no-]dangling::
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Print objects that exist but that are never 'directly' used (default).
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`--no-dangling` can be used to omit this information from the output.
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--root::
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Report root nodes.
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--tags::
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Report tags.
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--cache::
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Consider any object recorded in the index also as a head node for
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an unreachability trace.
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--no-reflogs::
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Do not consider commits that are referenced only by an
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entry in a reflog to be reachable. This option is meant
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only to search for commits that used to be in a ref, but
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now aren't, but are still in that corresponding reflog.
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--full::
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Check not just objects in GIT_OBJECT_DIRECTORY
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($GIT_DIR/objects), but also the ones found in alternate
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object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES
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or $GIT_DIR/objects/info/alternates,
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and in packed Git archives found in $GIT_DIR/objects/pack
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and corresponding pack subdirectories in alternate
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object pools. This is now default; you can turn it off
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with --no-full.
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--connectivity-only::
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Check only the connectivity of reachable objects, making sure
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that any objects referenced by a reachable tag, commit, or tree
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is present. This speeds up the operation by avoiding reading
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blobs entirely (though it does still check that referenced blobs
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exist). This will detect corruption in commits and trees, but
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not do any semantic checks (e.g., for format errors). Corruption
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in blob objects will not be detected at all.
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--strict::
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Enable more strict checking, namely to catch a file mode
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recorded with g+w bit set, which was created by older
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versions of Git. Existing repositories, including the
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Linux kernel, Git itself, and sparse repository have old
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objects that triggers this check, but it is recommended
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to check new projects with this flag.
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--verbose::
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Be chatty.
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--lost-found::
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Write dangling objects into .git/lost-found/commit/ or
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.git/lost-found/other/, depending on type. If the object is
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a blob, the contents are written into the file, rather than
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its object name.
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--name-objects::
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When displaying names of reachable objects, in addition to the
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SHA-1 also display a name that describes *how* they are reachable,
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compatible with linkgit:git-rev-parse[1], e.g.
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`HEAD@{1234567890}~25^2:src/`.
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--[no-]progress::
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Progress status is reported on the standard error stream by
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default when it is attached to a terminal, unless
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--no-progress or --verbose is specified. --progress forces
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progress status even if the standard error stream is not
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directed to a terminal.
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DISCUSSION
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----------
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git-fsck tests SHA-1 and general object sanity, and it does full tracking
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of the resulting reachability and everything else. It prints out any
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corruption it finds (missing or bad objects), and if you use the
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`--unreachable` flag it will also print out objects that exist but that
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aren't reachable from any of the specified head nodes (or the default
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set, as mentioned above).
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Any corrupt objects you will have to find in backups or other archives
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(i.e., you can just remove them and do an 'rsync' with some other site in
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the hopes that somebody else has the object you have corrupted).
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If core.commitGraph is true, the commit-graph file will also be inspected
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using 'git commit-graph verify'. See linkgit:git-commit-graph[1].
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Extracted Diagnostics
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---------------------
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expect dangling commits - potential heads - due to lack of head information::
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You haven't specified any nodes as heads so it won't be
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possible to differentiate between un-parented commits and
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root nodes.
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missing sha1 directory '<dir>'::
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The directory holding the sha1 objects is missing.
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unreachable <type> <object>::
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The <type> object <object>, isn't actually referred to directly
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or indirectly in any of the trees or commits seen. This can
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mean that there's another root node that you're not specifying
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or that the tree is corrupt. If you haven't missed a root node
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then you might as well delete unreachable nodes since they
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can't be used.
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missing <type> <object>::
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The <type> object <object>, is referred to but isn't present in
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the database.
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dangling <type> <object>::
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The <type> object <object>, is present in the database but never
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'directly' used. A dangling commit could be a root node.
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sha1 mismatch <object>::
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The database has an object who's sha1 doesn't match the
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database value.
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This indicates a serious data integrity problem.
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Environment Variables
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---------------------
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GIT_OBJECT_DIRECTORY::
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used to specify the object database root (usually $GIT_DIR/objects)
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GIT_INDEX_FILE::
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used to specify the index file of the index
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GIT_ALTERNATE_OBJECT_DIRECTORIES::
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used to specify additional object database roots (usually unset)
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GIT
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---
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Part of the linkgit:git[1] suite
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