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.
24 Print out objects that exist but that aren't readable from any
25 of the specified head nodes.
34 Consider any object recorded in the cache also as a head node for
35 an unreachability trace.
37 It tests SHA1 and general object sanity, and it does full tracking of
38 the resulting reachability and everything else. It prints out any
39 corruption it finds (missing or bad objects), and if you use the
40 '--unreachable' flag it will also print out objects that exist but
41 that aren't readable from any of the specified head nodes.
45 git-fsck-cache --unreachable $(cat .git/HEAD)
49 git-fsck-cache --unreachable $(cat .git/refs/heads/*)
51 will do quite a _lot_ of verification on the tree. There are a few
52 extra validity tests to be added (make sure that tree objects are
53 sorted properly etc), but on the whole if "git-fsck-cache" is happy, you
56 Any corrupt objects you will have to find in backups or other archives
57 (ie you can just remove them and do an "rsync" with some other site in
58 the hopes that somebody else has the object you have corrupted).
60 Of course, "valid tree" doesn't mean that it wasn't generated by some
61 evil person, and the end result might be crap. Git is a revision
62 tracking system, not a quality assurance system ;)
67 expect dangling commits - potential heads - due to lack of head information::
68 You haven't specified any nodes as heads so it won't be
69 possible to differentiate between un-parented commits and
72 missing sha1 directory '<dir>'::
73 The directory holding the sha1 objects is missing.
75 unreachable <type> <object>::
76 The <type> object <object>, isn't actually referred to directly
77 or indirectly in any of the trees or commits seen. This can
78 mean that there's another root node that you're not specifying
79 or that the tree is corrupt. If you haven't missed a root node
80 then you might as well delete unreachable nodes since they
83 missing <type> <object>::
84 The <type> object <object>, is referred to but isn't present in
87 dangling <type> <object>::
88 The <type> object <object>, is present in the database but never
89 'directly' used. A dangling commit could be a root node.
91 warning: git-fsck-cache: tree <tree> has full pathnames in it::
94 sha1 mismatch <object>::
95 The database has an object who's sha1 doesn't match the
97 This indicates a serious data integrity problem.
98 (note: this error occured during early git development when
99 the database format changed.)
101 Environment Variables
102 ---------------------
104 GIT_OBJECT_DIRECTORY::
105 used to specify the object database root (usually .git/objects)
108 used to specify the cache
113 Written by Linus Torvalds <torvalds@osdl.org>
117 Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
121 Part of the link:git.html[git] suite