webapp: Now always logs to .git/annex/daemon.log

It used to not log to daemon.log when a repository was first created, and
when starting the webapp. Now both do. Redirecting stdout and stderr to the
log is tricky when starting the webapp, because the web browser may want to
communicate with the user. (Either a console web browser, or web.browser = echo)
This is handled by restoring the original fds when running the browser.

Assistant.hs

@@ -163,28 +163,40 @@ type NamedThread = IO () -> IO (String, IO ())
 stopDaemon :: Annex ()
 stopDaemon = liftIO . Utility.Daemon.stopDaemon =<< fromRepo gitAnnexPidFile
 
-startDaemon :: Bool -> Bool -> Maybe (String -> FilePath -> IO ()) -> Annex ()
-startDaemon assistant foreground webappwaiter
-	| foreground = do
-		showStart (if assistant then "assistant" else "watch") "."
-		liftIO . Utility.Daemon.lockPidFile =<< fromRepo gitAnnexPidFile
-		go id
-	| otherwise = do
-		logfd <- liftIO . openLog =<< fromRepo gitAnnexLogFile
-		pidfile <- fromRepo gitAnnexPidFile
-		go $ Utility.Daemon.daemonize logfd (Just pidfile) False
+{- Starts the daemon. If the daemon is run in the foreground, once it's
+ - running, can start the browser.
+ -
+ - startbrowser is passed the url and html shim file, as well as the original
+ - stdout and stderr descriptors. -}
+startDaemon :: Bool -> Bool -> Maybe (Maybe Handle -> Maybe Handle -> String -> FilePath -> IO ()) -> Annex ()
+startDaemon assistant foreground startbrowser = do
+	pidfile <- fromRepo gitAnnexPidFile
+	logfd <- liftIO . openLog =<< fromRepo gitAnnexLogFile
+	if foreground
+		then do
+			liftIO $ Utility.Daemon.lockPidFile pidfile
+			origout <- liftIO $ catchMaybeIO $ 
+				fdToHandle =<< dup stdOutput
+			origerr <- liftIO $ catchMaybeIO $ 
+				fdToHandle =<< dup stdError
+			liftIO $ Utility.Daemon.redirLog logfd
+			showStart (if assistant then "assistant" else "watch") "."
+			start id $ 
+				case startbrowser of
+					Nothing -> Nothing
+					Just a -> Just $ a origout origerr
+		else
+			start (Utility.Daemon.daemonize logfd (Just pidfile) False) Nothing
   where
-	go d = startAssistant assistant d webappwaiter
+	start daemonize webappwaiter = withThreadState $ \st -> do
+		checkCanWatch
+		when assistant $ checkEnvironment
+		dstatus <- startDaemonStatus
+		liftIO $ daemonize $
+			flip runAssistant (go webappwaiter) 
+				=<< newAssistantData st dstatus
 
-startAssistant :: Bool -> (IO () -> IO ()) -> Maybe (String -> FilePath -> IO ()) -> Annex ()
-startAssistant assistant daemonize webappwaiter = withThreadState $ \st -> do
-	checkCanWatch
-	when assistant $ checkEnvironment
-	dstatus <- startDaemonStatus
-	liftIO $ daemonize $
-		flip runAssistant go =<< newAssistantData st dstatus
-  where
-	go = do
+	go webappwaiter = do
 		d <- getAssistant id
 #ifdef WITH_WEBAPP
 		urlrenderer <- liftIO newUrlRenderer
@@ -216,6 +228,7 @@ startAssistant assistant daemonize webappwaiter = withThreadState $ \st -> do
 			, assist $ glacierThread
 			, watch $ watchThread
 			]
+	
 		liftIO waitForTermination
 
 	watch a = (True, a)