7 git-fsck-cache - Verifies the connectivity and validity of the objects in the database
12 'git-fsck-cache' [--tags] [--root] [--unreachable] [--cache] [<object>*]
16 Verifies the connectivity and validity of the objects in the database.
21 An object to treat as the head of an unreachability trace.
23 If no objects are given, git-fsck-cache defaults to using the
24 index file and all SHA1 references in .git/refs/* as heads.
27 Print out objects that exist but that aren't readable from any
28 of the reference nodes.
37 Consider any object recorded in the cache also as a head node for
38 an unreachability trace.
40 It tests SHA1 and general object sanity, and it does full tracking of
41 the resulting reachability and everything else. It prints out any
42 corruption it finds (missing or bad objects), and if you use the
43 '--unreachable' flag it will also print out objects that exist but
44 that aren't readable from any of the specified head nodes.
48 git-fsck-cache --unreachable $(cat .git/HEAD)
52 git-fsck-cache --unreachable $(cat .git/refs/heads/*)
54 will do quite a _lot_ of verification on the tree. There are a few
55 extra validity tests to be added (make sure that tree objects are
56 sorted properly etc), but on the whole if "git-fsck-cache" is happy, you
59 Any corrupt objects you will have to find in backups or other archives
60 (ie you can just remove them and do an "rsync" with some other site in
61 the hopes that somebody else has the object you have corrupted).
63 Of course, "valid tree" doesn't mean that it wasn't generated by some
64 evil person, and the end result might be crap. Git is a revision
65 tracking system, not a quality assurance system ;)
70 expect dangling commits - potential heads - due to lack of head information::
71 You haven't specified any nodes as heads so it won't be
72 possible to differentiate between un-parented commits and
75 missing sha1 directory '<dir>'::
76 The directory holding the sha1 objects is missing.
78 unreachable <type> <object>::
79 The <type> object <object>, isn't actually referred to directly
80 or indirectly in any of the trees or commits seen. This can
81 mean that there's another root node that you're not specifying
82 or that the tree is corrupt. If you haven't missed a root node
83 then you might as well delete unreachable nodes since they
86 missing <type> <object>::
87 The <type> object <object>, is referred to but isn't present in
90 dangling <type> <object>::
91 The <type> object <object>, is present in the database but never
92 'directly' used. A dangling commit could be a root node.
94 warning: git-fsck-cache: tree <tree> has full pathnames in it::
97 sha1 mismatch <object>::
98 The database has an object who's sha1 doesn't match the
100 This indicates a serious data integrity problem.
101 (note: this error occured during early git development when
102 the database format changed.)
104 Environment Variables
105 ---------------------
107 GIT_OBJECT_DIRECTORY::
108 used to specify the object database root (usually .git/objects)
111 used to specify the cache
116 Written by Linus Torvalds <torvalds@osdl.org>
120 Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
124 Part of the link:git.html[git] suite