direct: Avoid leaving file content in misctemp if interrupted.

Annex/Direct.hs

@@ -353,11 +353,8 @@ toDirectGen k f = do
 		void $ addAssociatedFile k f
 		modifyContent loc $ do
 			thawContent loc
-			replaceFileOr f
-				(liftIO . moveFile loc)
-				$ \tmp -> do -- rollback
-					liftIO (moveFile tmp loc)
-					freezeContent loc
+			liftIO (replaceFileFrom loc f)
+				`catchIO` (\_ -> freezeContent loc)
 	fromdirect loc = do
 		replaceFile f $
 			liftIO . void . copyFileExternal loc

Annex/ReplaceFile.hs

@@ -39,7 +39,12 @@ replaceFileOr file action rollback = do
 		return tmpfile
 	go tmpfile = do
 		action tmpfile
-		liftIO $ catchIO (rename tmpfile file) (fallback tmpfile)
-	fallback tmpfile _ = do
-		createDirectoryIfMissing True $ parentDir file
-		moveFile tmpfile file
+		liftIO $ replaceFileFrom tmpfile file
+
+replaceFileFrom :: FilePath -> FilePath -> IO ()
+replaceFileFrom src dest = go `catchIO` fallback
+  where
+	go = moveFile src dest
+	fallback _ = do
+		createDirectoryIfMissing True $ parentDir dest
+		go