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215a7ad1 JH |
1 | git-fsck-objects(1) |
2 | =================== | |
2cf565c5 DG |
3 | |
4 | NAME | |
5 | ---- | |
215a7ad1 | 6 | git-fsck-objects - Verifies the connectivity and validity of the objects in the database |
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7 | |
8 | ||
9 | SYNOPSIS | |
10 | -------- | |
353ce815 JF |
11 | [verse] |
12 | 'git-fsck-objects' [--tags] [--root] [--unreachable] [--cache] | |
7aaa715d | 13 | [--full] [--strict] [<object>*] |
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14 | |
15 | DESCRIPTION | |
16 | ----------- | |
17 | Verifies the connectivity and validity of the objects in the database. | |
18 | ||
19 | OPTIONS | |
20 | ------- | |
21 | <object>:: | |
22 | An object to treat as the head of an unreachability trace. | |
df8baa42 JF |
23 | + |
24 | If no objects are given, git-fsck-objects defaults to using the | |
25 | index file and all SHA1 references in .git/refs/* as heads. | |
6f97a894 | 26 | |
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27 | --unreachable:: |
28 | Print out objects that exist but that aren't readable from any | |
6f97a894 | 29 | of the reference nodes. |
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30 | |
31 | --root:: | |
32 | Report root nodes. | |
33 | ||
34 | --tags:: | |
35 | Report tags. | |
36 | ||
37 | --cache:: | |
5f3aa197 | 38 | Consider any object recorded in the index also as a head node for |
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39 | an unreachability trace. |
40 | ||
8a498a05 JH |
41 | --full:: |
42 | Check not just objects in GIT_OBJECT_DIRECTORY | |
2c6e4771 | 43 | ($GIT_DIR/objects), but also the ones found in alternate |
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44 | object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES |
45 | or $GIT_DIR/objects/info/alternates, | |
72e9340c | 46 | and in packed git archives found in $GIT_DIR/objects/pack |
8a498a05 | 47 | and corresponding pack subdirectories in alternate |
7aaa715d | 48 | object pools. |
8a498a05 | 49 | |
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50 | --strict:: |
51 | Enable more strict checking, namely to catch a file mode | |
52 | recorded with g+w bit set, which was created by older | |
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53 | versions of git. Existing repositories, including the |
54 | Linux kernel, git itself, and sparse repository have old | |
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55 | objects that triggers this check, but it is recommended |
56 | to check new projects with this flag. | |
57 | ||
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58 | It tests SHA1 and general object sanity, and it does full tracking of |
59 | the resulting reachability and everything else. It prints out any | |
60 | corruption it finds (missing or bad objects), and if you use the | |
61 | '--unreachable' flag it will also print out objects that exist but | |
62 | that aren't readable from any of the specified head nodes. | |
63 | ||
64 | So for example | |
65 | ||
27dedf0c | 66 | git-fsck-objects --unreachable HEAD $(cat .git/refs/heads/*) |
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67 | |
68 | will do quite a _lot_ of verification on the tree. There are a few | |
69 | extra validity tests to be added (make sure that tree objects are | |
215a7ad1 | 70 | sorted properly etc), but on the whole if "git-fsck-objects" is happy, you |
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71 | do have a valid tree. |
72 | ||
73 | Any corrupt objects you will have to find in backups or other archives | |
74 | (ie you can just remove them and do an "rsync" with some other site in | |
75 | the hopes that somebody else has the object you have corrupted). | |
76 | ||
77 | Of course, "valid tree" doesn't mean that it wasn't generated by some | |
72e9340c | 78 | evil person, and the end result might be crap. git is a revision |
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79 | tracking system, not a quality assurance system ;) |
80 | ||
81 | Extracted Diagnostics | |
82 | --------------------- | |
83 | ||
84 | expect dangling commits - potential heads - due to lack of head information:: | |
85 | You haven't specified any nodes as heads so it won't be | |
86 | possible to differentiate between un-parented commits and | |
87 | root nodes. | |
88 | ||
89 | missing sha1 directory '<dir>':: | |
90 | The directory holding the sha1 objects is missing. | |
91 | ||
92 | unreachable <type> <object>:: | |
93 | The <type> object <object>, isn't actually referred to directly | |
94 | or indirectly in any of the trees or commits seen. This can | |
95 | mean that there's another root node that you're not specifying | |
96 | or that the tree is corrupt. If you haven't missed a root node | |
97 | then you might as well delete unreachable nodes since they | |
98 | can't be used. | |
99 | ||
100 | missing <type> <object>:: | |
101 | The <type> object <object>, is referred to but isn't present in | |
102 | the database. | |
103 | ||
104 | dangling <type> <object>:: | |
105 | The <type> object <object>, is present in the database but never | |
106 | 'directly' used. A dangling commit could be a root node. | |
107 | ||
215a7ad1 | 108 | warning: git-fsck-objects: tree <tree> has full pathnames in it:: |
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109 | And it shouldn't... |
110 | ||
111 | sha1 mismatch <object>:: | |
112 | The database has an object who's sha1 doesn't match the | |
113 | database value. | |
114 | This indicates a serious data integrity problem. | |
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115 | |
116 | Environment Variables | |
117 | --------------------- | |
118 | ||
119 | GIT_OBJECT_DIRECTORY:: | |
2c6e4771 | 120 | used to specify the object database root (usually $GIT_DIR/objects) |
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121 | |
122 | GIT_INDEX_FILE:: | |
5f3aa197 | 123 | used to specify the index file of the index |
2cf565c5 | 124 | |
df8baa42 | 125 | GIT_ALTERNATE_OBJECT_DIRECTORIES:: |
2c6e4771 | 126 | used to specify additional object database roots (usually unset) |
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127 | |
128 | Author | |
129 | ------ | |
130 | Written by Linus Torvalds <torvalds@osdl.org> | |
131 | ||
132 | Documentation | |
133 | -------------- | |
134 | Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>. | |
135 | ||
136 | GIT | |
137 | --- | |
a7154e91 | 138 | Part of the gitlink:git[7] suite |
2cf565c5 | 139 |