reorder repo parameters last

Many functions took the repo as their first parameter. Changing it
consistently to be the last parameter allows doing some useful things with
currying, that reduce boilerplate.

In particular, g <- gitRepo is almost never needed now, instead
use inRepo to run an IO action in the repo, and fromRepo to get
a value from the repo.

This also provides more opportunities to use monadic and applicative
combinators.

Command/Fsck.hs

@@ -79,26 +79,26 @@ check = sequence >=> dispatch
    in this repository only. -}
 verifyLocationLog :: Key -> String -> Annex Bool
 verifyLocationLog key desc = do
-	g <- gitRepo
 	present <- inAnnex key
 	
 	-- Since we're checking that a key's file is present, throw
 	-- in a permission fixup here too.
-	when present $ liftIO $ do
-		let f = gitAnnexLocation g key
-		preventWrite f
-		preventWrite (parentDir f)
+	when present $ do
+		f <- fromRepo $ gitAnnexLocation key
+		liftIO $ do
+			preventWrite f
+			preventWrite (parentDir f)
 
 	u <- getUUID
         uuids <- keyLocations key
 
 	case (present, u `elem` uuids) of
 		(True, False) -> do
-				fix g u InfoPresent
+				fix u InfoPresent
 				-- There is no data loss, so do not fail.
 				return True
 		(False, True) -> do
-				fix g u InfoMissing
+				fix u InfoMissing
 				warning $
 					"** Based on the location log, " ++ desc
 					++ "\n** was expected to be present, " ++
@@ -107,16 +107,16 @@ verifyLocationLog key desc = do
 		_ -> return True
 	
 	where
-		fix g u s = do
+		fix u s = do
 			showNote "fixing location log"
+			g <- gitRepo
 			logChange g key u s
 
 {- The size of the data for a key is checked against the size encoded in
  - the key's metadata, if available. -}
 checkKeySize :: Key -> Annex Bool
 checkKeySize key = do
-	g <- gitRepo
-	let file = gitAnnexLocation g key
+	file <- fromRepo $ gitAnnexLocation key
 	present <- liftIO $ doesFileExist file
 	case (present, Types.Key.keySize key) of
 		(_, Nothing) -> return True