convert TopFilePath to use RawFilePath

Adds a dependency on filepath-bytestring, an as yet unreleased fork of
filepath that operates on RawFilePath.

Git.Repo also changed to use RawFilePath for the path to the repo.

This does eliminate some RawFilePath -> FilePath -> RawFilePath
conversions. And filepath-bytestring's </> is probably faster.
But I don't expect a major performance improvement from this.
This is mostly groundwork for making Annex.Location use RawFilePath,
which will allow for a conversion-free pipleline.

Assistant/Threads/ConfigMonitor.hs

@@ -91,4 +91,4 @@ getConfigs = S.fromList . map extract
 	<$> liftAnnex (inRepo $ LsTree.lsTreeFiles Annex.Branch.fullname files)
   where
 	files = map (fromRawFilePath . fst) configFilesActions
-	extract treeitem = (toRawFilePath $ getTopFilePath $ LsTree.file treeitem, LsTree.sha treeitem)
+	extract treeitem = (getTopFilePath $ LsTree.file treeitem, LsTree.sha treeitem)

Assistant/Threads/Merger.hs

@@ -26,7 +26,7 @@ import qualified Command.Sync
 mergeThread :: NamedThread
 mergeThread = namedThread "Merger" $ do
 	g <- liftAnnex gitRepo
-	let dir = Git.localGitDir g </> "refs"
+	let dir = fromRawFilePath (Git.localGitDir g) </> "refs"
 	liftIO $ createDirectoryIfMissing True dir
 	let hook a = Just <$> asIO2 (runHandler a)
 	changehook <- hook onChange

Assistant/Threads/MountWatcher.hs

@@ -159,7 +159,7 @@ handleMount urlrenderer dir = do
  -}
 remotesUnder :: FilePath -> Assistant [Remote]
 remotesUnder dir = do
-	repotop <- liftAnnex $ fromRepo Git.repoPath
+	repotop <- liftAnnex $ fromRawFilePath <$> fromRepo Git.repoPath
 	rs <- liftAnnex remoteList
 	pairs <- liftAnnex $ mapM (checkremote repotop) rs
 	let (waschanged, rs') = unzip pairs

Assistant/Threads/PairListener.hs

@@ -119,7 +119,7 @@ pairReqReceived False urlrenderer msg = do
 pairAckReceived :: Bool -> Maybe PairingInProgress -> PairMsg -> [PairingInProgress] -> Assistant [PairingInProgress]
 pairAckReceived True (Just pip) msg cache = do
 	stopSending pip
-	repodir <- repoPath <$> liftAnnex gitRepo
+	repodir <- fromRawFilePath . repoPath <$> liftAnnex gitRepo
 	liftIO $ setupAuthorizedKeys msg repodir
 	finishedLocalPairing msg (inProgressSshKeyPair pip)
 	startSending pip PairDone $ multicastPairMsg

Assistant/Threads/SanityChecker.hs

@@ -269,5 +269,5 @@ checkOldUnused urlrenderer = go =<< annexExpireUnused <$> liftAnnex Annex.getGit
 checkRepoExists :: Assistant ()
 checkRepoExists = do
 	g <- liftAnnex gitRepo
-	liftIO $ unlessM (doesDirectoryExist $ Git.repoPath g) $
+	liftIO $ unlessM (doesDirectoryExist $ fromRawFilePath $ Git.repoPath g) $
 		terminateSelf

Assistant/Threads/Watcher.hs

@@ -136,8 +136,7 @@ startupScan scanner = do
 		-- Notice any files that were deleted before
 		-- watching was started.
 		top <- liftAnnex $ fromRepo Git.repoPath
-		(fs, cleanup) <- liftAnnex $ inRepo $ LsFiles.deleted
-			[toRawFilePath top]
+		(fs, cleanup) <- liftAnnex $ inRepo $ LsFiles.deleted [top]
 		forM_ fs $ \f -> do
 			let f' = fromRawFilePath f
 			liftAnnex $ onDel' f'
@@ -215,7 +214,7 @@ onAddUnlocked symlinkssupported matcher f fs = do
   where
 	addassociatedfile key file = 
 		Database.Keys.addAssociatedFile key
-			=<< inRepo (toTopFilePath file)
+			=<< inRepo (toTopFilePath (toRawFilePath file))
 	samefilestatus key file status = do
 		cache <- Database.Keys.getInodeCaches key
 		curr <- withTSDelta $ \delta -> liftIO $ toInodeCache delta file status
@@ -225,7 +224,7 @@ onAddUnlocked symlinkssupported matcher f fs = do
 			_ -> return False
 	contentchanged oldkey file = do
 		Database.Keys.removeAssociatedFile oldkey
-			=<< inRepo (toTopFilePath file)
+			=<< inRepo (toTopFilePath (toRawFilePath file))
 		unlessM (inAnnex oldkey) $
 			logStatus oldkey InfoMissing
 	addlink file key = do
@@ -347,7 +346,7 @@ onDel file _ = do
 
 onDel' :: FilePath -> Annex ()
 onDel' file = do
-	topfile <- inRepo (toTopFilePath file)
+	topfile <- inRepo (toTopFilePath (toRawFilePath file))
 	withkey $ flip Database.Keys.removeAssociatedFile topfile
 	Annex.Queue.addUpdateIndex =<<
 		inRepo (Git.UpdateIndex.unstageFile file)

Assistant/Threads/WebApp.hs

@@ -100,7 +100,7 @@ webAppThread assistantdata urlrenderer noannex cannotrun postfirstrun listenhost
 	getreldir
 		| noannex = return Nothing
 		| otherwise = Just <$>
-			(relHome =<< absPath
+			(relHome =<< absPath . fromRawFilePath
 				=<< getAnnex' (fromRepo repoPath))
 	go tlssettings addr webapp htmlshim urlfile = do
 		let url = myUrl tlssettings webapp addr