check InodeCache in inAnnex et al

This avoids querying the database when the content file doen't exist
(or otherwise fails the provided check). However, it does add overhead of
querying the database, and will certianly impact performance.

Annex/Content.hs

@@ -84,7 +84,10 @@ inAnnex key = inAnnexCheck key $ liftIO . doesFileExist
 inAnnexCheck :: Key -> (FilePath -> Annex Bool) -> Annex Bool
 inAnnexCheck key check = inAnnex' id False check key
 
-{- Generic inAnnex, handling both indirect and direct mode.
+{- inAnnex that performs an arbitrary check of the key's content.
+ -
+ - When the content is unlocked, it must also be unmodified, or the bad
+ - value will be returned.
  -
  - In direct mode, at least one of the associated files must pass the
  - check. Additionally, the file must be unmodified.
@@ -93,9 +96,17 @@ inAnnex' :: (a -> Bool) -> a -> (FilePath -> Annex a) -> Key -> Annex a
 inAnnex' isgood bad check key = withObjectLoc key checkindirect checkdirect
   where
 	checkindirect loc = do
-		whenM (fromRepo Git.repoIsUrl) $
-			error "inAnnex cannot check remote repo"
-		check loc
+		r <- check loc
+		if isgood r
+			then do
+				cache <- Database.Keys.getInodeCaches key
+				if null cache
+					then return r
+					else ifM (sameInodeCache loc cache)
+						( return r
+						, return bad
+						)
+			else return bad
 	checkdirect [] = return bad
 	checkdirect (loc:locs) = do
 		r <- check loc