summaryrefslogtreecommitdiff
path: root/Annex/Locations.hs
blob: 322165aee614e64ca4aeebc670ca70079e7c7f1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
{- git-annex file locations
 -
 - Copyright 2010-2015 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Annex.Locations (
	keyFile,
	fileKey,
	keyPaths,
	keyPath,
	annexDir,
	objectDir,
	gitAnnexLocation,
	gitAnnexLocationDepth,
	gitAnnexLink,
	gitAnnexContentLock,
	gitAnnexMapping,
	gitAnnexInodeCache,
	gitAnnexInodeSentinal,
	gitAnnexInodeSentinalCache,
	annexLocations,
	gitAnnexDir,
	gitAnnexObjectDir,
	gitAnnexTmpMiscDir,
	gitAnnexTmpObjectDir,
	gitAnnexTmpObjectLocation,
	gitAnnexBadDir,
	gitAnnexBadLocation,
	gitAnnexUnusedLog,
	gitAnnexKeysDb,
	gitAnnexKeysDbLock,
	gitAnnexFsckState,
	gitAnnexFsckDbDir,
	gitAnnexFsckDbLock,
	gitAnnexFsckResultsLog,
	gitAnnexScheduleState,
	gitAnnexTransferDir,
	gitAnnexCredsDir,
	gitAnnexWebCertificate,
	gitAnnexWebPrivKey,
	gitAnnexFeedStateDir,
	gitAnnexFeedState,
	gitAnnexMergeDir,
	gitAnnexJournalDir,
	gitAnnexJournalLock,
	gitAnnexPreCommitLock,
	gitAnnexMergeLock,
	gitAnnexIndex,
	gitAnnexIndexStatus,
	gitAnnexViewIndex,
	gitAnnexViewLog,
	gitAnnexIgnoredRefs,
	gitAnnexPidFile,
	gitAnnexPidLockFile,
	gitAnnexDaemonStatusFile,
	gitAnnexLogFile,
	gitAnnexFuzzTestLogFile,
	gitAnnexHtmlShim,
	gitAnnexUrlFile,
	gitAnnexTmpCfgFile,
	gitAnnexSshDir,
	gitAnnexRemotesDir,
	gitAnnexAssistantDefaultDir,
	isLinkToAnnex,
	HashLevels(..),
	hashDirMixed,
	hashDirLower,
	preSanitizeKeyName,

	prop_isomorphic_fileKey
) where

import Data.Char
import Data.Default

import Common
import Types.Key
import Types.UUID
import Types.GitConfig
import Types.Difference
import qualified Git
import Git.FilePath
import Annex.DirHashes
import Annex.Fixup

{- Conventions:
 -
 - Functions ending in "Dir" should always return values ending with a
 - trailing path separator. Most code does not rely on that, but a few
 - things do. 
 -
 - Everything else should not end in a trailing path sepatator. 
 -
 - Only functions (with names starting with "git") that build a path
 - based on a git repository should return full path relative to the git
 - repository. Everything else returns path segments.
 -}

{- The directory git annex uses for local state, relative to the .git
 - directory -}
annexDir :: FilePath
annexDir = addTrailingPathSeparator "annex"

{- The directory git annex uses for locally available object content,
 - relative to the .git directory -}
objectDir :: FilePath
objectDir = addTrailingPathSeparator $ annexDir </> "objects"

{- Annexed file's possible locations relative to the .git directory.
 - There are two different possibilities, using different hashes.
 -
 - Also, some repositories have a Difference in hash directory depth.
 -}
annexLocations :: GitConfig -> Key -> [FilePath]
annexLocations config key = map (annexLocation config key) dirHashes

annexLocation :: GitConfig -> Key -> (HashLevels -> Hasher) -> FilePath
annexLocation config key hasher = objectDir </> keyPath key (hasher $ objectHashLevels config)

{- Number of subdirectories from the gitAnnexObjectDir
 - to the gitAnnexLocation. -}
gitAnnexLocationDepth :: GitConfig -> Int
gitAnnexLocationDepth config = hashlevels + 1
  where
	HashLevels hashlevels = objectHashLevels config

{- Annexed object's location in a repository.
 -
 - When there are multiple possible locations, returns the one where the
 - file is actually present.
 -
 - When the file is not present, returns the location where the file should
 - be stored.
 -
 - This does not take direct mode into account, so in direct mode it is not
 - the actual location of the file's content.
 -}
gitAnnexLocation :: Key -> Git.Repo -> GitConfig -> IO FilePath
gitAnnexLocation key r config = gitAnnexLocation' key r config (annexCrippledFileSystem config) doesFileExist (Git.localGitDir r)
gitAnnexLocation' :: Key -> Git.Repo -> GitConfig -> Bool -> (FilePath -> IO Bool) -> FilePath -> IO FilePath
gitAnnexLocation' key r config crippled checker gitdir
	{- Bare repositories default to hashDirLower for new
	 - content, as it's more portable.
	 -
	 - Repositories on filesystems that are crippled also use
	 - hashDirLower, since they do not use symlinks and it's
	 - more portable.
	 -}
	| Git.repoIsLocalBare r || crippled =
		check $ map inrepo $ annexLocations config key
	| hasDifference ObjectHashLower (annexDifferences config) =
		return $ inrepo $ annexLocation config key hashDirLower
	{- Non-bare repositories only use hashDirMixed, so
	 - don't need to do any work to check if the file is
	 - present. -}
	| otherwise = return $ inrepo $ annexLocation config key hashDirMixed
  where
	inrepo d = gitdir </> d
	check locs@(l:_) = fromMaybe l <$> firstM checker locs
	check [] = error "internal"

{- Calculates a symlink target to link a file to an annexed object. -}
gitAnnexLink :: FilePath -> Key -> Git.Repo -> GitConfig -> IO FilePath
gitAnnexLink file key r config = do
	currdir <- getCurrentDirectory
	let absfile = fromMaybe whoops $ absNormPathUnix currdir file
	let gitdir = getgitdir currdir
	loc <- gitAnnexLocation' key r config False (\_ -> return True) gitdir
	toInternalGitPath <$> relPathDirToFile (parentDir absfile) loc
  where
	getgitdir currdir
		{- This special case is for git submodules on filesystems not
		 - supporting symlinks; generate link target that will
		 - work portably. -}
		| not (coreSymlinks config) && needsSubmoduleFixup r =
			fromMaybe whoops $ absNormPathUnix currdir $
				Git.repoPath r </> ".git"
		| otherwise = Git.localGitDir r
	whoops = error $ "unable to normalize " ++ file

{- File used to lock a key's content. -}
gitAnnexContentLock :: Key -> Git.Repo -> GitConfig -> IO FilePath
gitAnnexContentLock key r config = do
	loc <- gitAnnexLocation key r config
	return $ loc ++ ".lck"

{- File that maps from a key to the file(s) in the git repository.
 - Used in direct mode. -}
gitAnnexMapping :: Key -> Git.Repo -> GitConfig -> IO FilePath
gitAnnexMapping key r config = do
	loc <- gitAnnexLocation key r config
	return $ loc ++ ".map"

{- File that caches information about a key's content, used to determine
 - if a file has changed.
 - Used in direct mode. -}
gitAnnexInodeCache :: Key -> Git.Repo -> GitConfig -> IO FilePath
gitAnnexInodeCache key r config  = do
	loc <- gitAnnexLocation key r config
	return $ loc ++ ".cache"

gitAnnexInodeSentinal :: Git.Repo -> FilePath
gitAnnexInodeSentinal r = gitAnnexDir r </> "sentinal"

gitAnnexInodeSentinalCache :: Git.Repo -> FilePath
gitAnnexInodeSentinalCache r = gitAnnexInodeSentinal r ++ ".cache"

{- The annex directory of a repository. -}
gitAnnexDir :: Git.Repo -> FilePath
gitAnnexDir r = addTrailingPathSeparator $ Git.localGitDir r </> annexDir

{- The part of the annex directory where file contents are stored. -}
gitAnnexObjectDir :: Git.Repo -> FilePath
gitAnnexObjectDir r = addTrailingPathSeparator $ Git.localGitDir r </> objectDir

{- .git/annex/misctmp/ is used for random temp files -}
gitAnnexTmpMiscDir :: Git.Repo -> FilePath
gitAnnexTmpMiscDir r = addTrailingPathSeparator $ gitAnnexDir r </> "misctmp"

{- .git/annex/tmp/ is used for temp files for key's contents -}
gitAnnexTmpObjectDir :: Git.Repo -> FilePath
gitAnnexTmpObjectDir r = addTrailingPathSeparator $ gitAnnexDir r </> "tmp"

{- The temp file to use for a given key's content. -}
gitAnnexTmpObjectLocation :: Key -> Git.Repo -> FilePath
gitAnnexTmpObjectLocation key r = gitAnnexTmpObjectDir r </> keyFile key

{- .git/annex/bad/ is used for bad files found during fsck -}
gitAnnexBadDir :: Git.Repo -> FilePath
gitAnnexBadDir r = addTrailingPathSeparator $ gitAnnexDir r </> "bad"

{- The bad file to use for a given key. -}
gitAnnexBadLocation :: Key -> Git.Repo -> FilePath
gitAnnexBadLocation key r = gitAnnexBadDir r </> keyFile key

{- .git/annex/foounused is used to number possibly unused keys -}
gitAnnexUnusedLog :: FilePath -> Git.Repo -> FilePath
gitAnnexUnusedLog prefix r = gitAnnexDir r </> (prefix ++ "unused")

{- .git/annex/keys/ contains a database of information about keys. -}
gitAnnexKeysDb :: Git.Repo -> FilePath
gitAnnexKeysDb r = gitAnnexDir r </> "keys"

{- Lock file for the keys database. -}
gitAnnexKeysDbLock :: Git.Repo -> FilePath
gitAnnexKeysDbLock r = gitAnnexKeysDb r ++ ".lck"

{- .git/annex/fsck/uuid/ is used to store information about incremental
 - fscks. -}
gitAnnexFsckDir :: UUID -> Git.Repo -> FilePath
gitAnnexFsckDir u r = gitAnnexDir r </> "fsck" </> fromUUID u

{- used to store information about incremental fscks. -}
gitAnnexFsckState :: UUID -> Git.Repo -> FilePath
gitAnnexFsckState u r = gitAnnexFsckDir u r </> "state"

{- Directory containing database used to record fsck info. -}
gitAnnexFsckDbDir :: UUID -> Git.Repo -> FilePath
gitAnnexFsckDbDir u r = gitAnnexFsckDir u r </> "db"

{- Lock file for the fsck database. -}
gitAnnexFsckDbLock :: UUID -> Git.Repo -> FilePath
gitAnnexFsckDbLock u r = gitAnnexFsckDir u r </> "fsck.lck"

{- .git/annex/fsckresults/uuid is used to store results of git fscks -}
gitAnnexFsckResultsLog :: UUID -> Git.Repo -> FilePath
gitAnnexFsckResultsLog u r = gitAnnexDir r </> "fsckresults" </> fromUUID u

{- .git/annex/schedulestate is used to store information about when
 - scheduled jobs were last run. -}
gitAnnexScheduleState :: Git.Repo -> FilePath
gitAnnexScheduleState r = gitAnnexDir r </> "schedulestate"

{- .git/annex/creds/ is used to store credentials to access some special
 - remotes. -}
gitAnnexCredsDir :: Git.Repo -> FilePath
gitAnnexCredsDir r = addTrailingPathSeparator $ gitAnnexDir r </> "creds"

{- .git/annex/certificate.pem and .git/annex/key.pem are used by the webapp
 - when HTTPS is enabled -}
gitAnnexWebCertificate :: Git.Repo -> FilePath
gitAnnexWebCertificate r = gitAnnexDir r </> "certificate.pem"
gitAnnexWebPrivKey :: Git.Repo -> FilePath
gitAnnexWebPrivKey r = gitAnnexDir r </> "privkey.pem"

{- .git/annex/feeds/ is used to record per-key (url) state by importfeeds -}
gitAnnexFeedStateDir :: Git.Repo -> FilePath
gitAnnexFeedStateDir r = addTrailingPathSeparator $ gitAnnexDir r </> "feedstate"

gitAnnexFeedState :: Key -> Git.Repo -> FilePath
gitAnnexFeedState k r = gitAnnexFeedStateDir r </> keyFile k

{- .git/annex/merge/ is used for direct mode merges. -}
gitAnnexMergeDir :: Git.Repo -> FilePath
gitAnnexMergeDir r = addTrailingPathSeparator $ gitAnnexDir r </> "merge"

{- .git/annex/transfer/ is used to record keys currently
 - being transferred, and other transfer bookkeeping info. -}
gitAnnexTransferDir :: Git.Repo -> FilePath
gitAnnexTransferDir r = addTrailingPathSeparator $ gitAnnexDir r </> "transfer"

{- .git/annex/journal/ is used to journal changes made to the git-annex
 - branch -}
gitAnnexJournalDir :: Git.Repo -> FilePath
gitAnnexJournalDir r = addTrailingPathSeparator $ gitAnnexDir r </> "journal"

{- Lock file for the journal. -}
gitAnnexJournalLock :: Git.Repo -> FilePath
gitAnnexJournalLock r = gitAnnexDir r </> "journal.lck"

{- Lock file for the pre-commit hook. -}
gitAnnexPreCommitLock :: Git.Repo -> FilePath
gitAnnexPreCommitLock r = gitAnnexDir r </> "precommit.lck"

{- Lock file for direct mode merge. -}
gitAnnexMergeLock :: Git.Repo -> FilePath
gitAnnexMergeLock r = gitAnnexDir r </> "merge.lck"

{- .git/annex/index is used to stage changes to the git-annex branch -}
gitAnnexIndex :: Git.Repo -> FilePath
gitAnnexIndex r = gitAnnexDir r </> "index"

{- Holds the ref of the git-annex branch that the index was last updated to.
 -
 - The .lck in the name is a historical accident; this is not used as a
 - lock. -}
gitAnnexIndexStatus :: Git.Repo -> FilePath
gitAnnexIndexStatus r = gitAnnexDir r </> "index.lck"

{- The index file used to generate a filtered branch view._-}
gitAnnexViewIndex :: Git.Repo -> FilePath
gitAnnexViewIndex r = gitAnnexDir r </> "viewindex"

{- File containing a log of recently accessed views. -}
gitAnnexViewLog :: Git.Repo -> FilePath
gitAnnexViewLog r = gitAnnexDir r </> "viewlog"

{- List of refs that should not be merged into the git-annex branch. -}
gitAnnexIgnoredRefs :: Git.Repo -> FilePath
gitAnnexIgnoredRefs r = gitAnnexDir r </> "ignoredrefs"

{- Pid file for daemon mode. -}
gitAnnexPidFile :: Git.Repo -> FilePath
gitAnnexPidFile r = gitAnnexDir r </> "daemon.pid"

{- Pid lock file for pidlock mode -}
gitAnnexPidLockFile :: Git.Repo -> FilePath
gitAnnexPidLockFile r = gitAnnexDir r </> "pidlock"

{- Status file for daemon mode. -}
gitAnnexDaemonStatusFile :: Git.Repo -> FilePath
gitAnnexDaemonStatusFile r = gitAnnexDir r </> "daemon.status"

{- Log file for daemon mode. -}
gitAnnexLogFile :: Git.Repo -> FilePath
gitAnnexLogFile r = gitAnnexDir r </> "daemon.log"

{- Log file for fuzz test. -}
gitAnnexFuzzTestLogFile :: Git.Repo -> FilePath
gitAnnexFuzzTestLogFile r = gitAnnexDir r </> "fuzztest.log"

{- Html shim file used to launch the webapp. -}
gitAnnexHtmlShim :: Git.Repo -> FilePath
gitAnnexHtmlShim r = gitAnnexDir r </> "webapp.html"

{- File containing the url to the webapp. -}
gitAnnexUrlFile :: Git.Repo -> FilePath
gitAnnexUrlFile r = gitAnnexDir r </> "url"

{- Temporary file used to edit configuriation from the git-annex branch. -}
gitAnnexTmpCfgFile :: Git.Repo -> FilePath
gitAnnexTmpCfgFile r = gitAnnexDir r </> "config.tmp"

{- .git/annex/ssh/ is used for ssh connection caching -}
gitAnnexSshDir :: Git.Repo -> FilePath
gitAnnexSshDir r = addTrailingPathSeparator $ gitAnnexDir r </> "ssh"

{- .git/annex/remotes/ is used for remote-specific state. -}
gitAnnexRemotesDir :: Git.Repo -> FilePath
gitAnnexRemotesDir r = addTrailingPathSeparator $ gitAnnexDir r </> "remotes"

{- This is the base directory name used by the assistant when making
 - repositories, by default. -}
gitAnnexAssistantDefaultDir :: FilePath
gitAnnexAssistantDefaultDir = "annex"

{- Checks a symlink target to see if it appears to point to annexed content.
 -
 - We only look at paths inside the .git directory, and not at the .git
 - directory itself, because GIT_DIR may cause a directory name other
 - than .git to be used.
 -}
isLinkToAnnex :: FilePath -> Bool
isLinkToAnnex s = (pathSeparator:objectDir) `isInfixOf` s

{- Sanitizes a String that will be used as part of a Key's keyName,
 - dealing with characters that cause problems on substandard filesystems.
 -
 - This is used when a new Key is initially being generated, eg by getKey.
 - Unlike keyFile and fileKey, it does not need to be a reversable
 - escaping. Also, it's ok to change this to add more problimatic
 - characters later. Unlike changing keyFile, which could result in the
 - filenames used for existing keys changing and contents getting lost.
 -
 - It is, however, important that the input and output of this function
 - have a 1:1 mapping, to avoid two different inputs from mapping to the
 - same key.
 -}
preSanitizeKeyName :: String -> String
preSanitizeKeyName = concatMap escape
  where
	escape c
		| isAsciiUpper c || isAsciiLower c || isDigit c = [c]
		| c `elem` ".-_ " = [c] -- common, assumed safe
		| c `elem` "/%:" = [c] -- handled by keyFile
		-- , is safe and uncommon, so will be used to escape
		-- other characters. By itself, it is escaped to 
		-- doubled form.
		| c == ',' = ",,"
		| otherwise = ',' : show (ord c)

{- Converts a key into a filename fragment without any directory.
 -
 - Escape "/" in the key name, to keep a flat tree of files and avoid
 - issues with keys containing "/../" or ending with "/" etc. 
 -
 - "/" is escaped to "%" because it's short and rarely used, and resembles
 -     a slash
 - "%" is escaped to "&s", and "&" to "&a"; this ensures that the mapping
 -     is one to one.
 - ":" is escaped to "&c", because it seemed like a good idea at the time.
 -
 - Changing what this function escapes and how is not a good idea, as it
 - can cause existing objects to get lost.
 -}
keyFile :: Key -> FilePath
keyFile key = replace "/" "%" $ replace ":" "&c" $
	replace "%" "&s" $ replace "&" "&a"  $ key2file key

{- Reverses keyFile, converting a filename fragment (ie, the basename of
 - the symlink target) into a key. -}
fileKey :: FilePath -> Maybe Key
fileKey file = file2key $
	replace "&a" "&" $ replace "&s" "%" $
		replace "&c" ":" $ replace "%" "/" file

{- for quickcheck -}
prop_isomorphic_fileKey :: String -> Bool
prop_isomorphic_fileKey s
	| null s = True -- it's not legal for a key to have no keyName
	| otherwise= Just k == fileKey (keyFile k)
  where
	k = stubKey { keyName = s, keyBackendName = "test" }

{- A location to store a key on a special remote that uses a filesystem.
 - A directory hash is used, to protect against filesystems that dislike
 - having many items in a single directory.
 -
 - The file is put in a directory with the same name, this allows
 - write-protecting the directory to avoid accidental deletion of the file.
 -}
keyPath :: Key -> Hasher -> FilePath
keyPath key hasher = hasher key </> f </> f
  where
	f = keyFile key

{- All possibile locations to store a key in a special remote
 - using different directory hashes.
 -
 - This is compatible with the annexLocations, for interoperability between
 - special remotes and git-annex repos.
 -}
keyPaths :: Key -> [FilePath]
keyPaths key = map (\h -> keyPath key (h def)) dirHashes