drop webdav compatability with the directory special remote etc

The benefit of using a compatable directory structure does not outweigh the
cost in complexity of handling the multiple locations content can be stored
in directory special remotes. And this also allows doing away with the parent
directories, which can't be made unwritable in DAV, so have no benefit
there. This will save 2 http calls per file store.

But, kept the directory hashing, just in case.

Remote/WebDAV.hs

@@ -81,15 +81,14 @@ webdavSetup u c = do
 	setRemoteCredPair c (davCreds u)
 
 store :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
-store r k _f _p = do
+store r k _f _p = davAction r False $ \(baseurl, user, pass) -> do
+	let url = davLocation baseurl k
+	liftIO $ davMkdir (urlParent url) user pass
 	f <- inRepo $ gitAnnexLocation k
-	davAction r False $ \(baseurl, user, pass) -> liftIO $ do
-		let url = Prelude.head $ davLocations baseurl k
-		davMkdir (urlParent url) user pass
-		b <- L.readFile f
-		v <- catchMaybeHttp $ putContentAndProps url user pass
-			(noProps, (contentType, b))
-		return $ isJust v
+	b <- liftIO $ L.readFile f
+	v <- liftIO $ catchMaybeHttp $ putContentAndProps url user pass
+		(noProps, (contentType, b))
+	return $ isJust v
 
 storeEncrypted :: Remote -> (Cipher, Key) -> Key -> MeterUpdate -> Annex Bool
 storeEncrypted r (cipher, enck) k _p = davAction r False $ \creds -> liftIO $ do
@@ -98,14 +97,13 @@ storeEncrypted r (cipher, enck) k _p = davAction r False $ \creds -> liftIO $ do
 retrieve :: Remote -> Key -> AssociatedFile -> FilePath -> Annex Bool
 retrieve r k _f d = davAction r False $ liftIO . go
   where
-	go (baseurl, user, pass) = get $ davLocations baseurl k
-	  where
-		get [] = return False
-		get (u:urls) = maybe (get urls) save
-			=<< catchMaybeHttp (getPropsAndContent u user pass)
-		save (_, (_, b)) = do
-			L.writeFile d b
-			return True
+	go (baseurl, user, pass) = do
+		let url = davLocation baseurl k
+		maybe (return False) save
+			=<< catchMaybeHttp (getPropsAndContent url user pass)
+	save (_, (_, b)) = do
+		L.writeFile d b
+		return True
 
 retrieveCheap :: Remote -> Key -> FilePath -> Annex Bool
 retrieveCheap _ _ _ = return False
@@ -117,39 +115,24 @@ retrieveEncrypted r (cipher, enck) _ f = davAction r False $ \creds -> do
 remove :: Remote -> Key -> Annex Bool
 remove r k = davAction r False $ liftIO . go
   where
-	go (baseurl, user, pass) = delone $ davLocations baseurl k
-	  where
-		delone [] = return False
-		delone (u:urls) = maybe (delone urls) (const $ return True)
-			=<< catchMaybeHttp (deletedir u)
-
-		{- Rather than deleting first the file, and then its
-		 - immediate parent directory (to clean up), delete the
-		 - parent directory, along with all its contents in a
-		 - single recursive DAV call.
-		 - 
-		 - The file is the only thing we keep in there, and this
-		 - is faster. -}
-		deletedir u = deleteContent (urlParent u) user pass
+	go (baseurl, user, pass) = do
+		let url = davLocation baseurl k
+		isJust <$> catchMaybeHttp (deleteContent url user pass)
 
 checkPresent :: Remote -> Key -> Annex (Either String Bool)
-checkPresent r k = davAction r noconn go
+checkPresent r k = davAction r noconn $ \(baseurl, user, pass) -> do
+	showAction $ "checking " ++ name r
+	let url = davLocation baseurl k	
+	v <- liftIO $ catchHttp $ getProps url user pass
+	case v of
+		Right _ -> return $ Right True
+		Left (Left (StatusCodeException status _))
+			| statusCode status == statusCode notFound404 -> return $ Right False
+			| otherwise -> return $ Left $ show $ statusMessage status
+		Left (Left httpexception) -> return $ Left $ show httpexception
+		Left (Right ioexception) -> return $ Left $ show ioexception
   where
 	noconn = Left $ error $ name r ++ " not configured"
-	go (baseurl, user, pass) = do
-		showAction $ "checking " ++ name r
-		liftIO $ check $ davLocations baseurl k	
-	  where
-		check [] = return $ Right False
-		check (u:urls) = do
-			v <- catchHttp $ getProps u user pass
-			case v of
-				Right _ -> return $ Right True
-				Left (Left (StatusCodeException status _))
-					| statusCode status == statusCode notFound404 -> check urls
-					| otherwise -> return $ Left $ show $ statusMessage status
-				Left (Left httpexception) -> return $ Left $ show httpexception
-				Left (Right ioexception) -> return $ Left $ show ioexception
 
 davAction :: Remote -> a -> ((DavUrl, DavUser, DavPass) -> Annex a) -> Annex a
 davAction r unconfigured action = case config r of
@@ -167,12 +150,9 @@ toDavUser = B8.fromString
 toDavPass :: String -> DavPass
 toDavPass = B8.fromString
 
-{- All possibile locations to try to access a given Key.
- -
- - This is intentially the same as the directory special remote uses, to
- - allow interoperability. -}
-davLocations :: DavUrl -> Key -> [DavUrl]
-davLocations baseurl k = map (davUrl baseurl) (keyPaths k)
+{- The location to use to store a Key. -}
+davLocation :: DavUrl -> Key -> DavUrl
+davLocation baseurl k = davUrl baseurl $ hashDirLower k </> keyFile k
 
 davUrl :: DavUrl -> FilePath -> DavUrl
 davUrl baseurl file = baseurl </> file