Always use filesystem encoding for all file and handle reads and writes.

This is a big scary change. I have convinced myself it should be safe. I
hope!

Git/CatFile.hs

@@ -37,6 +37,7 @@ import Git.Command
 import Git.Types
 import Git.FilePath
 import qualified Utility.CoProcess as CoProcess
+import Utility.FileSystemEncoding
 
 data CatFileHandle = CatFileHandle 
 	{ catFileProcess :: CoProcess.CoProcessHandle

Git/Command.hs

@@ -53,7 +53,6 @@ runQuiet params repo = withQuietOutput createProcessSuccess $
 pipeReadLazy :: [CommandParam] -> Repo -> IO (String, IO Bool)
 pipeReadLazy params repo = assertLocal repo $ do
 	(_, Just h, _, pid) <- createProcess p { std_out = CreatePipe }
-	fileEncoding h
 	c <- hGetContents h
 	return (c, checkSuccessProcess pid)
   where
@@ -66,7 +65,6 @@ pipeReadLazy params repo = assertLocal repo $ do
 pipeReadStrict :: [CommandParam] -> Repo -> IO String
 pipeReadStrict params repo = assertLocal repo $
 	withHandle StdoutHandle (createProcessChecked ignoreFailureProcess) p $ \h -> do
-		fileEncoding h
 		output <- hGetContentsStrict h
 		hClose h
 		return output
@@ -81,9 +79,7 @@ pipeWriteRead params writer repo = assertLocal repo $
 	writeReadProcessEnv "git" (toCommand $ gitCommandLine params repo) 
 		(gitEnv repo) writer (Just adjusthandle)
   where
-	adjusthandle h = do
-		fileEncoding h
-		hSetNewlineMode h noNewlineTranslation
+	adjusthandle h = hSetNewlineMode h noNewlineTranslation
 
 {- Runs a git command, feeding it input on a handle with an action. -}
 pipeWrite :: [CommandParam] -> Repo -> (Handle -> IO ()) -> IO ()

Git/Config.hs

@@ -79,10 +79,6 @@ global = do
 {- Reads git config from a handle and populates a repo with it. -}
 hRead :: Repo -> Handle -> IO Repo
 hRead repo h = do
-	-- We use the FileSystemEncoding when reading from git-config,
-	-- because it can contain arbitrary filepaths (and other strings)
-	-- in any encoding.
-	fileEncoding h
 	val <- hGetContentsStrict h
 	store val repo
 
@@ -167,7 +163,6 @@ coreBare = "core.bare"
 fromPipe :: Repo -> String -> [CommandParam] -> IO (Either SomeException (Repo, String))
 fromPipe r cmd params = try $
 	withHandle StdoutHandle createProcessSuccess p $ \h -> do
-		fileEncoding h
 		val <- hGetContentsStrict h
 		r' <- store val r
 		return (r', val)

Git/HashObject.hs

@@ -41,7 +41,6 @@ hashFile h file = CoProcess.query h send receive
  - interface does not allow batch hashing without using temp files. -}
 hashBlob :: HashObjectHandle -> String -> IO Sha
 hashBlob h s = withTmpFile "hash" $ \tmp tmph -> do
-	fileEncoding tmph
 #ifdef mingw32_HOST_OS
 	hSetNewlineMode tmph noNewlineTranslation
 #endif

Git/Queue.hs

@@ -159,7 +159,6 @@ runAction repo action@(CommandAction {}) = do
 #ifndef mingw32_HOST_OS
 	let p = (proc "xargs" $ "-0":"git":toCommand gitparams) { env = gitEnv repo }
 	withHandle StdinHandle createProcessSuccess p $ \h -> do
-		fileEncoding h
 		hPutStr h $ intercalate "\0" $ toCommand $ getFiles action
 		hClose h
 #else

Git/Repair.hs

@@ -614,4 +614,4 @@ successfulRepair = fst
 safeReadFile :: FilePath -> IO String
 safeReadFile f = do
 	allowRead f
-	readFileStrictAnyEncoding f
+	readFileStrict f

Git/UnionMerge.hs

@@ -22,6 +22,7 @@ import Git.UpdateIndex
 import Git.HashObject
 import Git.Types
 import Git.FilePath
+import Utility.FileSystemEncoding
 
 {- Performs a union merge between two branches, staging it in the index.
  - Any previously staged changes in the index will be lost.
@@ -94,8 +95,7 @@ mergeFile info file hashhandle h = case filter (/= nullSha) [Ref asha, Ref bsha]
 	-- We don't know how the file is encoded, but need to
 	-- split it into lines to union merge. Using the
 	-- FileSystemEncoding for this is a hack, but ensures there
-	-- are no decoding errors. Note that this works because
-	-- hashObject sets fileEncoding on its write handle.
+	-- are no decoding errors.
 	getcontents s = lines . encodeW8NUL . L.unpack <$> catObject h s
 
 {- Calculates a union merge between a list of refs, with contents.

Git/UpdateIndex.hs

@@ -55,7 +55,6 @@ startUpdateIndex :: Repo -> IO UpdateIndexHandle
 startUpdateIndex repo = do
 	(Just h, _, _, p) <- createProcess (gitCreateProcess params repo)
 		{ std_in = CreatePipe }
-	fileEncoding h
 	return $ UpdateIndexHandle p h
   where
 	params = map Param ["update-index", "-z", "--index-info"]