1git-fsck(1) 2=========== 3 4NAME 5---- 6git-fsck - Verifies the connectivity and validity of the objects in the database 7 8 9SYNOPSIS 10-------- 11[verse] 12'git fsck' [--tags] [--root] [--unreachable] [--cache] [--no-reflogs] 13 [--[no-]full] [--strict] [--verbose] [--lost-found] 14 [--[no-]progress] [<object>*] 15 16DESCRIPTION 17----------- 18Verifies the connectivity and validity of the objects in the database. 19 20OPTIONS 21------- 22<object>:: 23 An object to treat as the head of an unreachability trace. 24+ 25If no objects are given, 'git fsck' defaults to using the 26index file, all SHA1 references in .git/refs/*, and all reflogs (unless 27--no-reflogs is given) as heads. 28 29--unreachable:: 30 Print out objects that exist but that aren't reachable from any 31 of the reference nodes. 32 33--root:: 34 Report root nodes. 35 36--tags:: 37 Report tags. 38 39--cache:: 40 Consider any object recorded in the index also as a head node for 41 an unreachability trace. 42 43--no-reflogs:: 44 Do not consider commits that are referenced only by an 45 entry in a reflog to be reachable. This option is meant 46 only to search for commits that used to be in a ref, but 47 now aren't, but are still in that corresponding reflog. 48 49--full:: 50 Check not just objects in GIT_OBJECT_DIRECTORY 51 ($GIT_DIR/objects), but also the ones found in alternate 52 object pools listed in GIT_ALTERNATE_OBJECT_DIRECTORIES 53 or $GIT_DIR/objects/info/alternates, 54 and in packed git archives found in $GIT_DIR/objects/pack 55 and corresponding pack subdirectories in alternate 56 object pools. This is now default; you can turn it off 57 with --no-full. 58 59--strict:: 60 Enable more strict checking, namely to catch a file mode 61 recorded with g+w bit set, which was created by older 62 versions of git. Existing repositories, including the 63 Linux kernel, git itself, and sparse repository have old 64 objects that triggers this check, but it is recommended 65 to check new projects with this flag. 66 67--verbose:: 68 Be chatty. 69 70--lost-found:: 71 Write dangling objects into .git/lost-found/commit/ or 72 .git/lost-found/other/, depending on type. If the object is 73 a blob, the contents are written into the file, rather than 74 its object name. 75 76--progress:: 77--no-progress:: 78 Progress status is reported on the standard error stream by 79 default when it is attached to a terminal, unless 80 --no-progress or --verbose is specified. --progress forces 81 progress status even if the standard error stream is not 82 directed to a terminal. 83 84DISCUSSION 85---------- 86 87git-fsck tests SHA1 and general object sanity, and it does full tracking 88of the resulting reachability and everything else. It prints out any 89corruption it finds (missing or bad objects), and if you use the 90'--unreachable' flag it will also print out objects that exist but that 91aren't reachable from any of the specified head nodes (or the default 92set, as mentioned above). 93 94Any corrupt objects you will have to find in backups or other archives 95(i.e., you can just remove them and do an 'rsync' with some other site in 96the hopes that somebody else has the object you have corrupted). 97 98Extracted Diagnostics 99--------------------- 100 101expect dangling commits - potential heads - due to lack of head information:: 102 You haven't specified any nodes as heads so it won't be 103 possible to differentiate between un-parented commits and 104 root nodes. 105 106missing sha1 directory '<dir>':: 107 The directory holding the sha1 objects is missing. 108 109unreachable <type> <object>:: 110 The <type> object <object>, isn't actually referred to directly 111 or indirectly in any of the trees or commits seen. This can 112 mean that there's another root node that you're not specifying 113 or that the tree is corrupt. If you haven't missed a root node 114 then you might as well delete unreachable nodes since they 115 can't be used. 116 117missing <type> <object>:: 118 The <type> object <object>, is referred to but isn't present in 119 the database. 120 121dangling <type> <object>:: 122 The <type> object <object>, is present in the database but never 123 'directly' used. A dangling commit could be a root node. 124 125sha1 mismatch <object>:: 126 The database has an object who's sha1 doesn't match the 127 database value. 128 This indicates a serious data integrity problem. 129 130Environment Variables 131--------------------- 132 133GIT_OBJECT_DIRECTORY:: 134 used to specify the object database root (usually $GIT_DIR/objects) 135 136GIT_INDEX_FILE:: 137 used to specify the index file of the index 138 139GIT_ALTERNATE_OBJECT_DIRECTORIES:: 140 used to specify additional object database roots (usually unset) 141 142GIT 143--- 144Part of the linkgit:git[1] suite