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|
{- 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.ThreadedMonad
import Assistant.DaemonStatus
import Assistant.ScanRemotes
import Assistant.Threads.Pusher (pushToRemotes)
import Assistant.Alert
import qualified Annex
import qualified Git
import Utility.ThreadScheduler
import Utility.Mounts
import Remote.List
import qualified Types.Remote as Remote
import Assistant.Threads.Merger
import qualified Git.Branch
import Control.Concurrent
import qualified Control.Exception as E
import qualified Data.Set as S
import Data.Time.Clock
#if WITH_DBUS
import DBus.Client
import DBus
import Data.Word (Word32)
#else
#warning Building without dbus support; will use mtab polling
#endif
thisThread :: ThreadName
thisThread = "MountWatcher"
mountWatcherThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> IO ()
mountWatcherThread st handle scanremotes =
#if WITH_DBUS
dbusThread st handle scanremotes
#else
pollingThread st handle scanremotes
#endif
#if WITH_DBUS
dbusThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> IO ()
dbusThread st dstatus scanremotes = E.catch (go =<< connectSession) onerr
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 <- newMVar =<< currentMountPoints
forM_ mountAdded $ \matcher ->
listen client matcher $ \_event -> do
nowmounted <- currentMountPoints
wasmounted <- swapMVar mvar nowmounted
handleMounts st dstatus scanremotes wasmounted nowmounted
, do
runThreadState st $
warning "No known volume monitor available through dbus; falling back to mtab polling"
pollinstead
)
onerr :: E.SomeException -> IO ()
onerr e = do
runThreadState st $
warning $ "Failed to use dbus; falling back to mtab polling (" ++ show e ++ ")"
pollinstead
pollinstead = pollingThread st dstatus scanremotes
type ServiceName = String
listServiceNames :: Client -> IO [ServiceName]
listServiceNames client = do
reply <- callDBus client "ListNames" []
return $ fromMaybe [] $ fromVariant (methodReturnBody reply !! 0)
callDBus :: Client -> MemberName -> [Variant] -> IO MethodReturn
callDBus client name params = call_ client $
(methodCall "/org/freedesktop/DBus" "org.freedesktop.DBus" name)
{ methodCallDestination = Just "org.freedesktop.DBus"
, methodCallBody = params
}
{- 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 -> IO Bool
checkMountMonitor client = do
running <- filter (`elem` usableservices)
<$> listServiceNames client
case running of
[] -> startOneService client startableservices
(service:_) -> do
debug thisThread [ "Using running DBUS service"
, service
, "to monitor mount events."
]
return True
where
startableservices = [gvfs]
usableservices = startableservices ++ [kde]
gvfs = "org.gtk.Private.GduVolumeMonitor"
kde = "org.kde.DeviceNotifications"
startOneService :: Client -> [ServiceName] -> IO Bool
startOneService _ [] = return False
startOneService client (x:xs) = do
_ <- callDBus client "StartServiceByName"
[toVariant x, toVariant (0 :: Word32)]
ifM (elem x <$> listServiceNames client)
( do
debug thisThread [ "Started DBUS service"
, x
, "to monitor mount events."
]
return True
, startOneService client xs
)
{- Filter matching events recieved when drives are mounted. -}
mountAdded :: [MatchRule]
mountAdded = [gvfs, kde]
where
gvfs = matchAny
{ matchInterface = Just "org.gtk.Private.RemoteVolumeMonitor"
, matchMember = Just "MountAdded"
}
kde = matchAny
{ matchInterface = Just "org.kde.Solid.Device"
, matchMember = Just "setupDone"
}
#endif
pollingThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> IO ()
pollingThread st dstatus scanremotes = go =<< currentMountPoints
where
go wasmounted = do
threadDelaySeconds (Seconds 10)
nowmounted <- currentMountPoints
handleMounts st dstatus scanremotes wasmounted nowmounted
go nowmounted
handleMounts :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> MountPoints -> MountPoints -> IO ()
handleMounts st dstatus scanremotes wasmounted nowmounted =
mapM_ (handleMount st dstatus scanremotes . mnt_dir) $
S.toList $ newMountPoints wasmounted nowmounted
handleMount :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> FilePath -> IO ()
handleMount st dstatus scanremotes dir = do
debug thisThread ["detected mount of", dir]
rs <- remotesUnder st dstatus dir
unless (null rs) $ do
let nonspecial = filter (Git.repoIsLocal . Remote.repo) rs
unless (null nonspecial) $ do
void $ alertWhile dstatus (syncAlert nonspecial) $ do
debug thisThread ["syncing with", show rs]
sync nonspecial =<< runThreadState st (inRepo Git.Branch.current)
addScanRemotes scanremotes nonspecial
where
sync rs (Just branch) = do
runThreadState st $ manualPull (Just branch) rs
now <- getCurrentTime
pushToRemotes thisThread now st Nothing rs
{- No local branch exists yet, but we can try pulling. -}
sync rs Nothing = do
runThreadState st $ manualPull Nothing rs
return True
{- 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 :: ThreadState -> DaemonStatusHandle -> FilePath -> IO [Remote]
remotesUnder st dstatus dir = runThreadState st $ do
repotop <- fromRepo Git.repoPath
rs <- remoteList
pairs <- mapM (checkremote repotop) rs
let (waschanged, rs') = unzip pairs
when (any id waschanged) $ do
Annex.changeState $ \s -> s { Annex.remotes = rs' }
updateKnownRemotes dstatus
return $ map snd $ filter fst pairs
where
checkremote repotop r = case Remote.path 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
|
