check rawSystem exit codes

Backend/File.hs

@@ -6,6 +6,7 @@ module Backend.File (backend) where
 import Control.Monad.State
 import System.IO
 import System.Cmd
+import System.Exit
 import Control.Exception
 import BackendTypes
 import LocationLog
@@ -68,10 +69,11 @@ copyFromRemote r key file = do
 	if (Git.repoIsLocal r)
 		then getlocal
 		else getremote
-	return ()
 	where
 		getlocal = do
-			rawSystem "cp" ["-a", location, file]
-			putStrLn "cp done"
+			res <-rawSystem "cp" ["-a", location, file]
+			if (res == ExitSuccess)
+				then return ()
+				else error "cp failed"
 		getremote = error "get via network not yet implemented!"
 		location = annexLocation r backend key

Backend/Url.hs

@@ -5,7 +5,7 @@ module Backend.Url (backend) where
 
 import Control.Monad.State
 import System.Cmd
-import IO
+import System.Exit
 import BackendTypes
 
 backend = Backend {
@@ -29,7 +29,7 @@ dummyRemove url = return False
 downloadUrl :: Key -> FilePath -> Annex Bool
 downloadUrl url file = do
 	liftIO $ putStrLn $ "download: " ++ (show url)
-	result <- liftIO $ try $ rawSystem "curl" ["-#", "-o", file, (show url)]
-	case (result) of
-		Left _ -> return False
-		Right _ -> return True
+	result <- liftIO $ rawSystem "curl" ["-#", "-o", file, (show url)]
+	if (result == ExitSuccess)
+		then return True
+		else return False