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2cf565c5 DG |
1 | git-fsck-cache(1) |
2 | ================= | |
3 | v0.1, May 2005 | |
4 | ||
5 | NAME | |
6 | ---- | |
7 | git-fsck-cache - Verifies the connectivity and validity of the objects in the database | |
8 | ||
9 | ||
10 | SYNOPSIS | |
11 | -------- | |
8a498a05 | 12 | 'git-fsck-cache' [--tags] [--root] [--unreachable] [--cache] [--standalone | --full] [<object>*] |
2cf565c5 DG |
13 | |
14 | DESCRIPTION | |
15 | ----------- | |
16 | Verifies the connectivity and validity of the objects in the database. | |
17 | ||
18 | OPTIONS | |
19 | ------- | |
20 | <object>:: | |
21 | An object to treat as the head of an unreachability trace. | |
22 | ||
6f97a894 LT |
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. | |
25 | ||
2cf565c5 DG |
26 | --unreachable:: |
27 | Print out objects that exist but that aren't readable from any | |
6f97a894 | 28 | of the reference nodes. |
2cf565c5 DG |
29 | |
30 | --root:: | |
31 | Report root nodes. | |
32 | ||
33 | --tags:: | |
34 | Report tags. | |
35 | ||
36 | --cache:: | |
37 | Consider any object recorded in the cache also as a head node for | |
38 | an unreachability trace. | |
39 | ||
8a498a05 JH |
40 | --standalone:: |
41 | Limit checks to the contents of GIT_OBJECT_DIRECTORY | |
42 | (.git/objects), making sure that it is consistent and | |
43 | complete without referring to objects found in alternate | |
44 | object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES, | |
45 | nor packed GIT archives found in .git/objects/pack; | |
46 | cannot be used with --full. | |
47 | ||
48 | --full:: | |
49 | Check not just objects in GIT_OBJECT_DIRECTORY | |
50 | (.git/objects), but also the ones found in alternate | |
51 | object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES, | |
52 | and in packed GIT archives found in .git/objects/pack | |
53 | and corresponding pack subdirectories in alternate | |
54 | object pools; cannot be used with --standalone. | |
55 | ||
2cf565c5 DG |
56 | It tests SHA1 and general object sanity, and it does full tracking of |
57 | the resulting reachability and everything else. It prints out any | |
58 | corruption it finds (missing or bad objects), and if you use the | |
59 | '--unreachable' flag it will also print out objects that exist but | |
60 | that aren't readable from any of the specified head nodes. | |
61 | ||
62 | So for example | |
63 | ||
64 | git-fsck-cache --unreachable $(cat .git/HEAD) | |
65 | ||
66 | or, for Cogito users: | |
67 | ||
68 | git-fsck-cache --unreachable $(cat .git/refs/heads/*) | |
69 | ||
70 | will do quite a _lot_ of verification on the tree. There are a few | |
71 | extra validity tests to be added (make sure that tree objects are | |
72 | sorted properly etc), but on the whole if "git-fsck-cache" is happy, you | |
73 | do have a valid tree. | |
74 | ||
75 | Any corrupt objects you will have to find in backups or other archives | |
76 | (ie you can just remove them and do an "rsync" with some other site in | |
77 | the hopes that somebody else has the object you have corrupted). | |
78 | ||
79 | Of course, "valid tree" doesn't mean that it wasn't generated by some | |
80 | evil person, and the end result might be crap. Git is a revision | |
81 | tracking system, not a quality assurance system ;) | |
82 | ||
83 | Extracted Diagnostics | |
84 | --------------------- | |
85 | ||
86 | expect dangling commits - potential heads - due to lack of head information:: | |
87 | You haven't specified any nodes as heads so it won't be | |
88 | possible to differentiate between un-parented commits and | |
89 | root nodes. | |
90 | ||
91 | missing sha1 directory '<dir>':: | |
92 | The directory holding the sha1 objects is missing. | |
93 | ||
94 | unreachable <type> <object>:: | |
95 | The <type> object <object>, isn't actually referred to directly | |
96 | or indirectly in any of the trees or commits seen. This can | |
97 | mean that there's another root node that you're not specifying | |
98 | or that the tree is corrupt. If you haven't missed a root node | |
99 | then you might as well delete unreachable nodes since they | |
100 | can't be used. | |
101 | ||
102 | missing <type> <object>:: | |
103 | The <type> object <object>, is referred to but isn't present in | |
104 | the database. | |
105 | ||
106 | dangling <type> <object>:: | |
107 | The <type> object <object>, is present in the database but never | |
108 | 'directly' used. A dangling commit could be a root node. | |
109 | ||
110 | warning: git-fsck-cache: tree <tree> has full pathnames in it:: | |
111 | And it shouldn't... | |
112 | ||
113 | sha1 mismatch <object>:: | |
114 | The database has an object who's sha1 doesn't match the | |
115 | database value. | |
116 | This indicates a serious data integrity problem. | |
117 | (note: this error occured during early git development when | |
118 | the database format changed.) | |
119 | ||
120 | Environment Variables | |
121 | --------------------- | |
122 | ||
123 | GIT_OBJECT_DIRECTORY:: | |
124 | used to specify the object database root (usually .git/objects) | |
125 | ||
126 | GIT_INDEX_FILE:: | |
127 | used to specify the cache | |
128 | ||
129 | ||
130 | Author | |
131 | ------ | |
132 | Written by Linus Torvalds <torvalds@osdl.org> | |
133 | ||
134 | Documentation | |
135 | -------------- | |
136 | Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>. | |
137 | ||
138 | GIT | |
139 | --- | |
140 | Part of the link:git.html[git] suite | |
141 |