summaryrefslogtreecommitdiff
path: root/Remote/Rsync.hs
blob: 8acf91214af4e73867c1df92238ed7ab1dead76c (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
{- A remote that is only accessible by rsync.
 -
 - Copyright 2011 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

{-# LANGUAGE CPP #-}

module Remote.Rsync (
	remote,
	store,
	retrieve,
	remove,
	checkKey,
	withRsyncScratchDir,
	genRsyncOpts,
	RsyncOpts
) where

import Annex.Common
import Types.Remote
import qualified Git
import Config
import Config.Cost
import Annex.Content
import Annex.UUID
import Annex.Ssh
import Remote.Helper.Special
import Remote.Helper.Messages
import Remote.Rsync.RsyncUrl
import Crypto
import Utility.Rsync
import Utility.CopyFile
import Messages.Progress
import Utility.Metered
import Logs.Transfer
import Types.Creds
import Annex.DirHashes
import Utility.Tmp

import qualified Data.Map as M

remote :: RemoteType
remote = RemoteType {
	typename = "rsync",
	enumerate = const (findSpecialRemotes "rsyncurl"),
	generate = gen,
	setup = rsyncSetup
}

gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc = do
	cst <- remoteCost gc expensiveRemoteCost
	(transport, url) <- rsyncTransport gc $
		fromMaybe (error "missing rsyncurl") $ remoteAnnexRsyncUrl gc
	let o = genRsyncOpts c gc transport url
	let islocal = rsyncUrlIsPath $ rsyncUrl o
	return $ Just $ specialRemote' specialcfg c
		(simplyPrepare $ fileStorer $ store o)
		(simplyPrepare $ fileRetriever $ retrieve o)
		(simplyPrepare $ remove o)
		(simplyPrepare $ checkKey r o)
		Remote
			{ uuid = u
			, cost = cst
			, name = Git.repoDescribe r
			, storeKey = storeKeyDummy
			, retrieveKeyFile = retreiveKeyFileDummy
			, retrieveKeyFileCheap = retrieveCheap o
			, removeKey = removeKeyDummy
			, lockContent = Nothing
			, checkPresent = checkPresentDummy
			, checkPresentCheap = False
			, whereisKey = Nothing
			, remoteFsck = Nothing
			, repairRepo = Nothing
			, config = c
			, repo = r
			, gitconfig = gc
			, localpath = if islocal
				then Just $ rsyncUrl o
				else Nothing
			, readonly = False
			, availability = if islocal then LocallyAvailable else GloballyAvailable
			, remotetype = remote
			, mkUnavailable = return Nothing
			, getInfo = return [("url", url)]
			, claimUrl = Nothing
			, checkUrl = Nothing
			}
  where
	specialcfg = (specialRemoteCfg c)
		-- Rsync displays its own progress.
		{ displayProgress = False }

genRsyncOpts :: RemoteConfig -> RemoteGitConfig -> [CommandParam] -> RsyncUrl -> RsyncOpts
genRsyncOpts c gc transport url = RsyncOpts
	{ rsyncUrl = url
	, rsyncOptions = transport ++ opts []
	, rsyncUploadOptions = transport ++ opts (remoteAnnexRsyncUploadOptions gc)
	, rsyncDownloadOptions = transport ++ opts (remoteAnnexRsyncDownloadOptions gc)
	, rsyncShellEscape = M.lookup "shellescape" c /= Just "no"
	}
  where
	opts specificopts = map Param $ filter safe $
		remoteAnnexRsyncOptions gc ++ specificopts
	safe opt
		-- Don't allow user to pass --delete to rsync;
		-- that could cause it to delete other keys
		-- in the same hash bucket as a key it sends.
		| opt == "--delete" = False
		| opt == "--delete-excluded" = False
		| otherwise = True

rsyncTransport :: RemoteGitConfig -> RsyncUrl -> Annex ([CommandParam], RsyncUrl)
rsyncTransport gc url
	| rsyncUrlIsShell url =
		(\rsh -> return (rsyncShell rsh, url)) =<<
		case fromNull ["ssh"] (remoteAnnexRsyncTransport gc) of
			"ssh":sshopts -> do
				let (port, sshopts') = sshReadPort sshopts
				    userhost = takeWhile (/=':') url
				-- Connection caching
				(Param "ssh":) <$> sshOptions
					(userhost, port) gc
					(map Param $ loginopt ++ sshopts')
			"rsh":rshopts -> return $ map Param $ "rsh" :
				loginopt ++ rshopts
			rsh -> error $ "Unknown Rsync transport: "
				++ unwords rsh
	| otherwise = return ([], url)
  where
	login = case separate (=='@') url of
		(_h, "") -> Nothing
		(l, _)  -> Just l
	loginopt = maybe [] (\l -> ["-l",l]) login
	fromNull as xs = if null xs then as else xs

rsyncSetup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> Annex (RemoteConfig, UUID)
rsyncSetup mu _ c gc = do
	u <- maybe (liftIO genUUID) return mu
	-- verify configuration is sane
	let url = fromMaybe (error "Specify rsyncurl=") $
		M.lookup "rsyncurl" c
	(c', _encsetup) <- encryptionSetup c gc

	-- The rsyncurl is stored in git config, not only in this remote's
	-- persistant state, so it can vary between hosts.
	gitConfigSpecialRemote u c' "rsyncurl" url
	return (c', u)

{- To send a single key is slightly tricky; need to build up a temporary
 - directory structure to pass to rsync so it can create the hash
 - directories.
 -
 - This would not be necessary if the hash directory structure used locally
 - was always the same as that used on the rsync remote. So if that's ever
 - unified, this gets nicer.
 - (When we have the right hash directory structure, we can just
 - pass --include=X --include=X/Y --include=X/Y/file --exclude=*)
 -}
store :: RsyncOpts -> Key -> FilePath -> MeterUpdate -> Annex Bool
store o k src meterupdate = withRsyncScratchDir $ \tmp -> do
	let dest = tmp </> Prelude.head (keyPaths k)
	liftIO $ createDirectoryIfMissing True $ parentDir dest
	ok <- liftIO $ if canrename
		then do
			rename src dest
			return True
		else createLinkOrCopy src dest
	ps <- sendParams
	if ok
		then showResumable $ rsyncRemote Upload o (Just meterupdate) $ ps ++
			Param "--recursive" : partialParams ++
			-- tmp/ to send contents of tmp dir
			[ File $ addTrailingPathSeparator tmp
			, Param $ rsyncUrl o
			]
		else return False
  where
	{- If the key being sent is encrypted or chunked, the file
	 - containing its content is a temp file, and so can be
	 - renamed into place. Otherwise, the file is the annexed
	 - object file, and has to be copied or hard linked into place. -}
	canrename = isEncKey k || isChunkKey k

retrieve :: RsyncOpts -> FilePath -> Key -> MeterUpdate -> Annex ()
retrieve o f k p = 
	unlessM (rsyncRetrieve o k f (Just p)) $
		error "rsync failed"

retrieveCheap :: RsyncOpts -> Key -> AssociatedFile -> FilePath -> Annex Bool
retrieveCheap o k _af f = ifM (preseedTmp k f) ( rsyncRetrieve o k f Nothing , return False )

remove :: RsyncOpts -> Remover
remove o k = do
	ps <- sendParams
	withRsyncScratchDir $ \tmp -> liftIO $ do
		{- Send an empty directory to rysnc to make it delete. -}
		let dummy = tmp </> keyFile k
		createDirectoryIfMissing True dummy
		rsync $ rsyncOptions o ++ ps ++
			map (\s -> Param $ "--include=" ++ s) includes ++
			[ Param "--exclude=*" -- exclude everything else
			, Param "--quiet", Param "--delete", Param "--recursive"
			] ++ partialParams ++ 
			[ Param $ addTrailingPathSeparator dummy
			, Param $ rsyncUrl o
			]
  where
	{- Specify include rules to match the directories where the
	 - content could be. Note that the parent directories have
	 - to also be explicitly included, due to how rsync
	 - traverses directories. -}
	includes = concatMap use dirHashes
	use h = let dir = h def k in
		[ parentDir dir
		, dir
		-- match content directory and anything in it
		, dir </> keyFile k </> "***"
		]

checkKey :: Git.Repo -> RsyncOpts -> CheckPresent
checkKey r o k = do
	showChecking r
	-- note: Does not currently differentiate between rsync failing
	-- to connect, and the file not being present.
	untilTrue (rsyncUrls o k) $ \u -> 
		liftIO $ catchBoolIO $ do
			withQuietOutput createProcessSuccess $
				proc "rsync" $ toCommand $
					rsyncOptions o ++ [Param u]
			return True

{- Rsync params to enable resumes of sending files safely,
 - ensure that files are only moved into place once complete
 -}
partialParams :: [CommandParam]
partialParams = [Param "--partial", Param "--partial-dir=.rsync-partial"]

{- When sending files from crippled filesystems, the permissions can be all
 - messed up, and it's better to use the default permissions on the
 - destination. -}
sendParams :: Annex [CommandParam]
sendParams = ifM crippledFileSystem
	( return [rsyncUseDestinationPermissions]
	, return []
	)

{- Runs an action in an empty scratch directory that can be used to build
 - up trees for rsync. -}
withRsyncScratchDir :: (FilePath -> Annex a) -> Annex a
withRsyncScratchDir a = do
	t <- fromRepo gitAnnexTmpObjectDir
	withTmpDirIn t "rsynctmp" a

rsyncRetrieve :: RsyncOpts -> Key -> FilePath -> Maybe MeterUpdate -> Annex Bool
rsyncRetrieve o k dest meterupdate =
	showResumable $ untilTrue (rsyncUrls o k) $ \u -> rsyncRemote Download o meterupdate
		-- use inplace when retrieving to support resuming
		[ Param "--inplace"
		, Param u
		, File dest
		]

showResumable :: Annex Bool -> Annex Bool
showResumable a = ifM a
	( return True
	, do
		showLongNote "rsync failed -- run git annex again to resume file transfer"
		return False
	)

rsyncRemote :: Direction -> RsyncOpts -> Maybe MeterUpdate -> [CommandParam] -> Annex Bool
rsyncRemote direction o m params = do
	showOutput -- make way for progress bar
	case m of
		Nothing -> liftIO $ rsync ps
		Just meter -> do
			oh <- mkOutputHandler
			liftIO $ rsyncProgress oh meter ps
  where
	ps = opts ++ Param "--progress" : params
	opts
		| direction == Download = rsyncDownloadOptions o
		| otherwise = rsyncUploadOptions o