connect existing meters to the transfer log for downloads

Most remotes have meters in their implementations of retrieveKeyFile
already. Simply hooking these up to the transfer log makes that information
available. Easy peasy.

This is particularly valuable information for encrypted remotes, which
otherwise bypass the assistant's polling of temp files, and so don't have
good progress bars yet.

Still some work to do here (see progressbars.mdwn changes), but this
is entirely an improvement from the lack of progress bars for encrypted
downloads.

Remote/Helper/Encryptable.hs

@@ -54,7 +54,7 @@ encryptionSetup c = case (M.lookup "encryption" c, extractCipher c) of
 encryptableRemote
 	:: RemoteConfig
 	-> ((Cipher, Key) -> Key -> MeterUpdate -> Annex Bool)
-	-> ((Cipher, Key) -> Key -> FilePath -> Annex Bool)
+	-> ((Cipher, Key) -> Key -> FilePath -> MeterUpdate -> Annex Bool)
 	-> Remote
 	-> Remote
 encryptableRemote c storeKeyEncrypted retrieveKeyFileEncrypted r = 
@@ -70,9 +70,9 @@ encryptableRemote c storeKeyEncrypted retrieveKeyFileEncrypted r =
 	store k f p = cip k >>= maybe
 		(storeKey r k f p)
 		(\enck -> storeKeyEncrypted enck k p)
-	retrieve k f d = cip k >>= maybe
-		(retrieveKeyFile r k f d)
-		(\enck -> retrieveKeyFileEncrypted enck k d)
+	retrieve k f d p = cip k >>= maybe
+		(retrieveKeyFile r k f d p)
+		(\enck -> retrieveKeyFileEncrypted enck k d p)
 	retrieveCheap k d = cip k >>= maybe
 		(retrieveKeyFileCheap r k d)
 		(\_ -> return False)

Remote/Helper/Hooks.hs

@@ -29,7 +29,7 @@ addHooks' r starthook stophook = r'
   where
 	r' = r
 		{ storeKey = \k f p -> wrapper $ storeKey r k f p
-		, retrieveKeyFile = \k f d -> wrapper $ retrieveKeyFile r k f d
+		, retrieveKeyFile = \k f d p -> wrapper $ retrieveKeyFile r k f d p
 		, retrieveKeyFileCheap = \k f -> wrapper $ retrieveKeyFileCheap r k f
 		, removeKey = \k -> wrapper $ removeKey r k
 		, hasKey = \k -> wrapper $ hasKey r k