debugging improvements

add timestamps to debug messages

Add lots of debug output in the assistant's threads.

Assistant.hs

@@ -82,7 +82,7 @@
 
 module Assistant where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Assistant.DaemonStatus
 import Assistant.Changes
@@ -136,6 +136,8 @@ startDaemon assistant foreground
 				, mountWatcherThread st dstatus
 				, watchThread st dstatus transferqueue changechan
 				]
+			debug "assistant"
+				["all git-annex assistant threads started"]
 			waitForTermination
 
 stopDaemon :: Annex ()

Assistant/Common.hs

@@ -0,0 +1,21 @@
+{- Common infrastructure for the git-annex assistant threads.
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Assistant.Common (
+	module X,
+	ThreadName,
+	debug
+) where
+
+import Common.Annex as X
+
+import System.Log.Logger
+
+type ThreadName = String
+
+debug :: ThreadName -> [String] -> IO ()
+debug threadname ws = debugM threadname $ unwords $ (threadname ++ ":") : ws

Assistant/Threads/Committer.hs

@@ -7,7 +7,7 @@
 
 module Assistant.Threads.Committer where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.Changes
 import Assistant.Commits
 import Assistant.ThreadedMonad
@@ -31,6 +31,9 @@ import Data.Tuple.Utils
 import qualified Data.Set as S
 import Data.Either
 
+thisThread :: ThreadName
+thisThread = "Committer"
+
 {- This thread makes git commits at appropriate times. -}
 commitThread :: ThreadState -> ChangeChan -> CommitChan -> TransferQueue -> DaemonStatusHandle -> IO ()
 commitThread st changechan commitchan transferqueue dstatus = runEvery (Seconds 1) $ do
@@ -45,10 +48,24 @@ commitThread st changechan commitchan transferqueue dstatus = runEvery (Seconds
 			readychanges <- handleAdds st changechan transferqueue dstatus changes
 			if shouldCommit time readychanges
 				then do
+					debug thisThread
+						[ "committing"
+						, show (length readychanges)
+						, "changes"
+						]
 					void $ tryIO $ runThreadState st commitStaged
 					recordCommit commitchan (Commit time)
-				else refillChanges changechan readychanges
-		else refillChanges changechan changes
+				else refill readychanges
+		else refill changes
+	where
+		refill cs = do
+			debug thisThread
+				[ "delaying commit of"
+				, show (length cs)
+				, "changes"
+				]
+			refillChanges changechan cs
+			
 
 commitStaged :: Annex ()
 commitStaged = do

Assistant/Threads/Merger.hs

@@ -5,9 +5,12 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-module Assistant.Threads.Merger where
+module Assistant.Threads.Merger (
+	mergeThread,
+	manualPull,
+) where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Utility.DirWatcher
 import Utility.Types.DirWatcher
@@ -19,6 +22,9 @@ import qualified Git.Branch
 import qualified Command.Sync
 import qualified Remote
 
+thisThread :: ThreadName
+thisThread = "Merger"
+
 {- This thread watches for changes to .git/refs/heads/synced/*,
  - which indicate incoming pushes. It merges those pushes into the
  - currently checked out branch. -}
@@ -33,6 +39,7 @@ mergeThread st = do
 		, errHook = hook onErr
 		}
 	void $ watchDir dir (const False) hooks id
+	debug thisThread ["watching", dir]
 
 type Handler = Git.Repo -> FilePath -> Maybe FileStatus -> IO ()
 
@@ -68,7 +75,11 @@ onAdd g file _
 		let changedbranch = Git.Ref $
 			"refs" </> "heads" </> takeFileName file
 		current <- Git.Branch.current g
-		when (Just changedbranch == current) $
+		when (Just changedbranch == current) $ do
+			liftIO $ debug thisThread
+				[ "merging changes into"
+				, show current
+				]
 			void $ mergeBranch changedbranch g
 
 mergeBranch :: Git.Ref -> Git.Repo -> IO Bool

Assistant/Threads/MountWatcher.hs

@@ -10,7 +10,7 @@
 
 module Assistant.Threads.MountWatcher where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Assistant.DaemonStatus
 import Utility.ThreadScheduler
@@ -19,7 +19,6 @@ import Utility.Mounts
 import Control.Concurrent
 import qualified Control.Exception as E
 import qualified Data.Set as S
-import System.Log.Logger
 
 #if WITH_DBUS
 import DBus.Client
@@ -29,6 +28,9 @@ import Data.Word (Word32)
 #warning Building without dbus support; will use mtab polling
 #endif
 
+thisThread :: ThreadName
+thisThread = "MountWatcher"
+
 mountWatcherThread :: ThreadState -> DaemonStatusHandle -> IO ()
 mountWatcherThread st handle =
 #if WITH_DBUS
@@ -89,7 +91,7 @@ checkMountMonitor client = do
 	if null running
 		then startOneService client startableservices
 		else do
-			myDebug [ "Using running DBUS service"
+			debug thisThread [ "Using running DBUS service"
 				, Prelude.head running
 				, "to monitor mount events."
 				]
@@ -107,7 +109,7 @@ startOneService client (x:xs) = do
 		[toVariant x, toVariant (0 :: Word32)]
 	ifM (elem x <$> listServiceNames client)
 		( do
-			myDebug [ "Started DBUS service"
+			debug thisThread [ "Started DBUS service"
 				, x
 				, "to monitor mount events."
 				]
@@ -145,7 +147,7 @@ handleMounts st handle wasmounted nowmounted = mapM_ (handleMount st handle) $
 
 handleMount :: ThreadState -> DaemonStatusHandle -> Mntent -> IO ()
 handleMount st handle mntent = do
-	myDebug ["detected mount of",  mnt_dir mntent]
+	debug thisThread ["detected mount of",  mnt_dir mntent]
 
 type MountPoints = S.Set Mntent
 
@@ -156,6 +158,3 @@ currentMountPoints = S.fromList <$> getMounts
 {- Finds new mount points, given an old and a new set. -}
 newMountPoints :: MountPoints -> MountPoints -> MountPoints
 newMountPoints old new = S.difference new old
-
-myDebug :: [String] -> IO ()
-myDebug ms = debugM "MountWatcher" $ unwords ("MountWatcher:":ms)

Assistant/Threads/Pusher.hs

@@ -7,7 +7,7 @@
 
 module Assistant.Threads.Pusher where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.Commits
 import Assistant.Pushes
 import Assistant.DaemonStatus
@@ -20,6 +20,9 @@ import Utility.Parallel
 import Data.Time.Clock
 import qualified Data.Map as M
 
+thisThread :: ThreadName
+thisThread = "Pusher"
+
 {- This thread retries pushes that failed before. -}
 pushRetryThread :: ThreadState -> FailedPushMap -> IO ()
 pushRetryThread st pushmap = runEvery (Seconds halfhour) $ do
@@ -27,6 +30,11 @@ pushRetryThread st pushmap = runEvery (Seconds halfhour) $ do
 	-- pushes to retry.
 	topush <- getFailedPushesBefore pushmap (fromIntegral halfhour)
 	unless (null topush) $ do
+		debug thisThread
+			[ "retrying"
+			, show (length topush)
+			, "failed pushes"
+			]
 		now <- getCurrentTime
 		pushToRemotes now st pushmap topush
 	where
@@ -46,7 +54,13 @@ pushThread st daemonstatus commitchan pushmap = do
 				remotes <- runThreadState st $
 					knownRemotes <$> getDaemonStatus daemonstatus
 				pushToRemotes now st pushmap remotes
-			else refillCommits commitchan commits
+			else do
+				debug thisThread
+					[ "delaying push of"
+					, show (length commits)
+					, "commits"
+					]
+				refillCommits commitchan commits
 
 {- Decide if now is a good time to push to remotes.
  -
@@ -71,11 +85,20 @@ pushToRemotes now st pushmap remotes = do
 	go True branch g remotes
 	where
 		go shouldretry branch g rs = do
+			debug thisThread
+				[ "pushing to"
+				, show rs
+				]
 			Command.Sync.updateBranch (Command.Sync.syncBranch branch) g
 			(succeeded, failed) <- inParallel (push g branch) rs
 			changeFailedPushMap pushmap $ \m ->
 				M.union (makemap failed) $
 					M.difference m (makemap succeeded)
+			unless (null failed) $
+				debug thisThread
+					[ "failed to push to"
+					, show failed
+					]
 			unless (null failed || not shouldretry) $
 				retry branch g failed
 
@@ -86,5 +109,6 @@ pushToRemotes now st pushmap remotes = do
 				( exitSuccess, exitFailure)
 
 		retry branch g rs = do
+			debug thisThread [ "trying manual pull to resolve failed pushes" ]
 			runThreadState st $ manualPull branch rs
 			go False branch g rs

Assistant/Threads/SanityChecker.hs

@@ -9,22 +9,27 @@ module Assistant.Threads.SanityChecker (
 	sanityCheckerThread
 ) where
 
-import Common.Annex
-import qualified Git.LsFiles
+import Assistant.Common
 import Assistant.DaemonStatus
 import Assistant.ThreadedMonad
 import Assistant.Changes
 import Assistant.TransferQueue
+import qualified Git.LsFiles
 import Utility.ThreadScheduler
 import qualified Assistant.Threads.Watcher as Watcher
 
 import Data.Time.Clock.POSIX
 
+thisThread :: ThreadName
+thisThread = "SanityChecker"
+
 {- This thread wakes up occasionally to make sure the tree is in good shape. -}
 sanityCheckerThread :: ThreadState -> DaemonStatusHandle -> TransferQueue -> ChangeChan -> IO ()
 sanityCheckerThread st status transferqueue changechan = forever $ do
 	waitForNextCheck st status
 
+	debug thisThread ["starting sanity check"]
+
 	runThreadState st $
 		modifyDaemonStatus_ status $ \s -> s
 				{ sanityCheckRunning = True }
@@ -38,6 +43,9 @@ sanityCheckerThread st status transferqueue changechan = forever $ do
 			{ sanityCheckRunning = False
 			, lastSanityCheck = Just now
 			}
+	
+	debug thisThread ["sanity check complete"]
+
 
 {- Only run one check per day, from the time of the last check. -}
 waitForNextCheck :: ThreadState -> DaemonStatusHandle -> IO ()
@@ -80,5 +88,6 @@ check st status transferqueue changechan = do
 		insanity m = runThreadState st $ warning m
 		addsymlink file s = do
 			insanity $ "found unstaged symlink: " ++ file
-			Watcher.runHandler st status transferqueue changechan
+			Watcher.runHandler thisThread st status
+				transferqueue changechan
 				Watcher.onAddSymlink file s

Assistant/Threads/TransferWatcher.hs

@@ -7,7 +7,7 @@
 
 module Assistant.Threads.TransferWatcher where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Assistant.DaemonStatus
 import Logs.Transfer
@@ -16,6 +16,9 @@ import Utility.Types.DirWatcher
 
 import Data.Map as M
 
+thisThread :: ThreadName
+thisThread = "TransferWatcher"
+
 {- This thread watches for changes to the gitAnnexTransferDir,
  - and updates the DaemonStatus's map of ongoing transfers. -}
 transferWatcherThread :: ThreadState -> DaemonStatusHandle -> IO ()
@@ -30,6 +33,7 @@ transferWatcherThread st dstatus = do
 		, errHook = hook onErr
 		}
 	void $ watchDir dir (const False) hooks id
+	debug thisThread ["watching for transfers"]
 
 type Handler = ThreadState -> DaemonStatusHandle -> FilePath -> Maybe FileStatus -> IO ()
 
@@ -51,11 +55,17 @@ onErr _ _ msg _ = error msg
 onAdd :: Handler
 onAdd st dstatus file _ = case parseTransferFile file of
 	Nothing -> noop
-	Just t -> runThreadState st $ go t =<< checkTransfer t
+	Just t -> do
+		runThreadState st $ go t =<< checkTransfer t
 	where
 		go _ Nothing = noop -- transfer already finished
-		go t (Just info) = adjustTransfers dstatus $
-			M.insertWith' merge t info
+		go t (Just info) = do
+			liftIO $ debug thisThread
+				[ "transfer starting:"
+				, show t
+				]
+			adjustTransfers dstatus $
+				M.insertWith' merge t info
 		-- preseve transferTid, which is not written to disk
 		merge new old = new { transferTid = transferTid old }
 
@@ -63,4 +73,9 @@ onAdd st dstatus file _ = case parseTransferFile file of
 onDel :: Handler
 onDel st dstatus file _ = case parseTransferFile file of
 	Nothing -> noop
-	Just t -> void $ runThreadState st $ removeTransfer dstatus t
+	Just t -> do
+		debug thisThread
+			[ "transfer finishing:"
+			, show t
+			]
+		void $ runThreadState st $ removeTransfer dstatus t

Assistant/Threads/Transferrer.hs

@@ -7,7 +7,7 @@
 
 module Assistant.Threads.Transferrer where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Assistant.DaemonStatus
 import Assistant.TransferQueue
@@ -22,6 +22,9 @@ import Data.Time.Clock.POSIX
 import Data.Time.Clock
 import qualified Data.Map as M
 
+thisThread :: ThreadName
+thisThread = "Transferrer"
+
 {- For now only one transfer is run at a time. -}
 maxTransfers :: Int
 maxTransfers = 1
@@ -32,8 +35,12 @@ transfererThread st dstatus transferqueue slots = go
 	where
 		go = do
 			(t, info) <- getNextTransfer transferqueue
-			whenM (runThreadState st $ shouldTransfer dstatus t info) $
-				runTransfer st dstatus slots t info
+			ifM (runThreadState st $ shouldTransfer dstatus t info)
+				( do
+					debug thisThread [ "Transferring:" , show t ]
+					runTransfer st dstatus slots t info
+				, debug thisThread [ "Skipping unnecessary transfer:" , show t ]
+				)
 			go
 
 {- Checks if the requested transfer is already running, or

Assistant/Threads/Watcher.hs

@@ -5,9 +5,16 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-module Assistant.Threads.Watcher where
+module Assistant.Threads.Watcher (
+	watchThread,
+	checkCanWatch,
+	needLsof,
+	stageSymlink,
+	onAddSymlink,
+	runHandler,
+) where
 
-import Common.Annex
+import Assistant.Common
 import Assistant.ThreadedMonad
 import Assistant.DaemonStatus
 import Assistant.Changes
@@ -30,6 +37,9 @@ import Git.Types
 import Data.Bits.Utils
 import qualified Data.ByteString.Lazy as L
 
+thisThread :: ThreadName
+thisThread = "Watcher"
+
 checkCanWatch :: Annex ()
 checkCanWatch
 	| canWatch = 
@@ -46,10 +56,12 @@ needLsof = error $ unlines
 	]
 
 watchThread :: ThreadState -> DaemonStatusHandle -> TransferQueue -> ChangeChan -> IO ()
-watchThread st dstatus transferqueue changechan = void $ watchDir "." ignored hooks startup
+watchThread st dstatus transferqueue changechan = do
+	void $ watchDir "." ignored hooks startup
+	debug thisThread [ "watching", "."]
 	where
 		startup = statupScan st dstatus
-		hook a = Just $ runHandler st dstatus transferqueue changechan a
+		hook a = Just $ runHandler thisThread st dstatus transferqueue changechan a
 		hooks = WatchHooks
 			{ addHook = hook onAdd
 			, delHook = hook onDel
@@ -82,22 +94,22 @@ ignored = ig . takeFileName
 	ig ".gitattributes" = True
 	ig _ = False
 
-type Handler = FilePath -> Maybe FileStatus -> DaemonStatusHandle -> TransferQueue -> Annex (Maybe Change)
+type Handler = ThreadName -> FilePath -> Maybe FileStatus -> DaemonStatusHandle -> TransferQueue -> Annex (Maybe Change)
 
 {- Runs an action handler, inside the Annex monad, and if there was a
  - change, adds it to the ChangeChan.
  -
  - Exceptions are ignored, otherwise a whole watcher thread could be crashed.
  -}
-runHandler :: ThreadState -> DaemonStatusHandle -> TransferQueue -> ChangeChan -> Handler -> FilePath -> Maybe FileStatus -> IO ()
-runHandler st dstatus transferqueue changechan handler file filestatus = void $ do
+runHandler :: ThreadName -> ThreadState -> DaemonStatusHandle -> TransferQueue -> ChangeChan -> Handler -> FilePath -> Maybe FileStatus -> IO ()
+runHandler threadname st dstatus transferqueue changechan handler file filestatus = void $ do
 	r <- tryIO go
 	case r of
 		Left e -> print e
 		Right Nothing -> noop
 		Right (Just change) -> recordChange changechan change
 	where
-		go = runThreadState st $ handler file filestatus dstatus transferqueue
+		go = runThreadState st $ handler threadname file filestatus dstatus transferqueue
 
 {- During initial directory scan, this will be run for any regular files
  - that are already checked into git. We don't want to turn those into
@@ -118,7 +130,7 @@ runHandler st dstatus transferqueue changechan handler file filestatus = void $
  - the add.
  -}
 onAdd :: Handler
-onAdd file filestatus dstatus _
+onAdd threadname file filestatus dstatus _
 	| maybe False isRegularFile filestatus = do
 		ifM (scanComplete <$> getDaemonStatus dstatus)
 			( go
@@ -129,14 +141,16 @@ onAdd file filestatus dstatus _
 			)
 	| otherwise = noChange
 	where
-		go = pendingAddChange =<< Command.Add.lockDown file
+		go = do
+			liftIO $ debug threadname ["file added", file]
+			pendingAddChange =<< Command.Add.lockDown file
 
 {- A symlink might be an arbitrary symlink, which is just added.
  - Or, if it is a git-annex symlink, ensure it points to the content
  - before adding it.
  -}
 onAddSymlink :: Handler
-onAddSymlink file filestatus dstatus transferqueue = go =<< Backend.lookupFile file
+onAddSymlink threadname file filestatus dstatus transferqueue = go =<< Backend.lookupFile file
 	where
 		go (Just (key, _)) = do
 			link <- calcGitLink file key
@@ -146,6 +160,7 @@ onAddSymlink file filestatus dstatus transferqueue = go =<< Backend.lookupFile f
 					checkcontent key s
 					ensurestaged link s
 				, do
+					liftIO $ debug threadname ["fix symlink", file]
 					liftIO $ removeFile file
 					liftIO $ createSymbolicLink link file
 					addlink link
@@ -175,6 +190,7 @@ onAddSymlink file filestatus dstatus transferqueue = go =<< Backend.lookupFile f
 		{- For speed, tries to reuse the existing blob for
 		 - the symlink target. -}
 		addlink link = do
+			liftIO $ debug threadname ["add symlink", file]
 			v <- catObjectDetails $ Ref $ ':':file
 			case v of
 				Just (currlink, sha)
@@ -195,7 +211,8 @@ onAddSymlink file filestatus dstatus transferqueue = go =<< Backend.lookupFile f
 			| otherwise = noop
 
 onDel :: Handler
-onDel file _ _dstatus _ = do
+onDel threadname file _ _dstatus _ = do
+	liftIO $ debug threadname ["file deleted", file]
 	Annex.Queue.addUpdateIndex =<<
 		inRepo (Git.UpdateIndex.unstageFile file)
 	madeChange file RmChange
@@ -208,14 +225,15 @@ onDel file _ _dstatus _ = do
  - command to get the recursive list of files in the directory, so rm is
  - just as good. -}
 onDelDir :: Handler
-onDelDir dir _ _dstatus _ = do
+onDelDir threadname dir _ _dstatus _ = do
+	liftIO $ debug threadname ["directory deleted", dir]
 	Annex.Queue.addCommand "rm"
 		[Params "--quiet -r --cached --ignore-unmatch --"] [dir]
 	madeChange dir RmDirChange
 
 {- Called when there's an error with inotify. -}
 onErr :: Handler
-onErr msg _ _dstatus _ = do
+onErr _ msg _ _dstatus _ = do
 	warning msg
 	return Nothing
 

Option.hs

@@ -17,6 +17,9 @@ module Option (
 
 import System.Console.GetOpt
 import System.Log.Logger
+import System.Log.Formatter
+import System.Log.Handler (setFormatter, LogHandler)
+import System.Log.Handler.Simple
 
 import Common.Annex
 import qualified Annex
@@ -48,8 +51,13 @@ common =
 		setfast v = Annex.changeState $ \s -> s { Annex.fast = v }
 		setauto v = Annex.changeState $ \s -> s { Annex.auto = v }
 		setforcebackend v = Annex.changeState $ \s -> s { Annex.forcebackend = Just v }
-		setdebug = liftIO $ updateGlobalLogger rootLoggerName $
-			setLevel DEBUG
+		setdebug = liftIO $ do
+			s <- simpledebug
+			updateGlobalLogger rootLoggerName
+				(setLevel DEBUG . setHandlers [s])
+		simpledebug = setFormatter
+			<$> streamHandler stderr DEBUG
+			<*> pure (simpleLogFormatter "[$time] $msg")
 
 matcher :: [Option]
 matcher =