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
|
{- git-annex assistant mount watcher, using either dbus or mtab polling
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
module Assistant.Threads.MountWatcher where
import Assistant.Common
import Assistant.DaemonStatus
import Assistant.Sync
import qualified Annex
import qualified Git
import Utility.ThreadScheduler
import Utility.Mounts
import Remote.List
import qualified Types.Remote as Remote
import qualified Data.Set as S
#if WITH_DBUS
import Utility.DBus
import DBus.Client
import DBus
import Data.Word (Word32)
import Control.Concurrent
import qualified Control.Exception as E
#else
#warning Building without dbus support; will use mtab polling
#endif
mountWatcherThread :: NamedThread
mountWatcherThread = namedThread "MountWatcher" $
#if WITH_DBUS
dbusThread
#else
pollingThread
#endif
#if WITH_DBUS
dbusThread :: Assistant ()
dbusThread = do
runclient <- asIO1 go
r <- liftIO $ E.try $ runClient getSessionAddress runclient
either onerr (const noop) r
where
go client = ifM (checkMountMonitor client)
( do
{- Store the current mount points in an MVar, to be
- compared later. We could in theory work out the
- mount point from the dbus message, but this is
- easier. -}
mvar <- liftIO $ newMVar =<< currentMountPoints
handleevent <- asIO1 $ \_event -> do
nowmounted <- liftIO $ currentMountPoints
wasmounted <- liftIO $ swapMVar mvar nowmounted
handleMounts wasmounted nowmounted
liftIO $ forM_ mountChanged $ \matcher ->
listen client matcher handleevent
, do
liftAnnex $
warning "No known volume monitor available through dbus; falling back to mtab polling"
pollingThread
)
onerr :: E.SomeException -> Assistant ()
onerr e = do
{- If the session dbus fails, the user probably
- logged out of their desktop. Even if they log
- back in, we won't have access to the dbus
- session key, so polling is the best that can be
- done in this situation. -}
liftAnnex $
warning $ "dbus failed; falling back to mtab polling (" ++ show e ++ ")"
pollingThread
{- Examine the list of services connected to dbus, to see if there
- are any we can use to monitor mounts. If not, will attempt to start one. -}
checkMountMonitor :: Client -> Assistant Bool
checkMountMonitor client = do
running <- filter (`elem` usableservices)
<$> liftIO (listServiceNames client)
case running of
[] -> startOneService client startableservices
(service:_) -> do
debug [ "Using running DBUS service"
, service
, "to monitor mount events."
]
return True
where
startableservices = [gvfs, gvfsgdu]
usableservices = startableservices ++ [kde]
gvfs = "org.gtk.Private.UDisks2VolumeMonitor"
gvfsgdu = "org.gtk.Private.GduVolumeMonitor"
kde = "org.kde.DeviceNotifications"
startOneService :: Client -> [ServiceName] -> Assistant Bool
startOneService _ [] = return False
startOneService client (x:xs) = do
_ <- liftIO $ tryNonAsync $ callDBus client "StartServiceByName"
[toVariant x, toVariant (0 :: Word32)]
ifM (liftIO $ elem x <$> listServiceNames client)
( do
debug
[ "Started DBUS service", x
, "to monitor mount events."
]
return True
, startOneService client xs
)
{- Filter matching events recieved when drives are mounted and unmounted. -}
mountChanged :: [MatchRule]
mountChanged = [gvfs True, gvfs False, kde, kdefallback]
where
{- gvfs reliably generates this event whenever a
- drive is mounted/unmounted, whether automatically, or manually -}
gvfs mount = matchAny
{ matchInterface = Just "org.gtk.Private.RemoteVolumeMonitor"
, matchMember = Just $ if mount then "MountAdded" else "MountRemoved"
}
{- This event fires when KDE prompts the user what to do with a drive,
- but maybe not at other times. And it's not received -}
kde = matchAny
{ matchInterface = Just "org.kde.Solid.Device"
, matchMember = Just "setupDone"
}
{- This event may not be closely related to mounting a drive, but it's
- observed reliably when a drive gets mounted or unmounted. -}
kdefallback = matchAny
{ matchInterface = Just "org.kde.KDirNotify"
, matchMember = Just "enteredDirectory"
}
#endif
pollingThread :: Assistant ()
pollingThread = go =<< liftIO currentMountPoints
where
go wasmounted = do
liftIO $ threadDelaySeconds (Seconds 10)
nowmounted <- liftIO currentMountPoints
handleMounts wasmounted nowmounted
go nowmounted
handleMounts :: MountPoints -> MountPoints -> Assistant ()
handleMounts wasmounted nowmounted =
mapM_ (handleMount . mnt_dir) $
S.toList $ newMountPoints wasmounted nowmounted
handleMount :: FilePath -> Assistant ()
handleMount dir = do
debug ["detected mount of", dir]
rs <- filter (Git.repoIsLocal . Remote.repo) <$> remotesUnder dir
reconnectRemotes True $ filter (not . remoteAnnexIgnore . Remote.gitconfig) rs
{- Finds remotes located underneath the mount point.
-
- Updates state to include the remotes.
-
- The config of git remotes is re-read, as it may not have been available
- at startup time, or may have changed (it could even be a different
- repository at the same remote location..)
-}
remotesUnder :: FilePath -> Assistant [Remote]
remotesUnder dir = do
repotop <- liftAnnex $ fromRepo Git.repoPath
rs <- liftAnnex remoteList
pairs <- liftAnnex $ mapM (checkremote repotop) rs
let (waschanged, rs') = unzip pairs
when (any id waschanged) $ do
liftAnnex $ Annex.changeState $ \s -> s { Annex.remotes = rs' }
updateSyncRemotes
return $ map snd $ filter fst pairs
where
checkremote repotop r = case Remote.localpath r of
Just p | dirContains dir (absPathFrom repotop p) ->
(,) <$> pure True <*> updateRemote r
_ -> return (False, r)
type MountPoints = S.Set Mntent
currentMountPoints :: IO MountPoints
currentMountPoints = S.fromList <$> getMounts
newMountPoints :: MountPoints -> MountPoints -> MountPoints
newMountPoints old new = S.difference new old
|
