Avoid accumulating transfer failure log files unless the assistant is being used.

Only the assistant uses these, and only the assistant cleans them up, so
make only git annex transferkeys write them,

There is one behavior change from this. If glacier is being used, and a
manual git annex get --from glacier fails because the file isn't available
yet, the assistant will no longer later see that failed transfer file and
retry the get. Hope no-one depended on that old behavior.

Command/AddUrl.hs

@@ -223,7 +223,7 @@ addUrlFileQuvi relaxed quviurl videourl file = do
 				tmp <- fromRepo $ gitAnnexTmpObjectLocation key
 				showOutput
 				ok <- Transfer.notifyTransfer Transfer.Download (Just file) $
-					Transfer.download webUUID key (Just file) Transfer.forwardRetry $ const $ do
+					Transfer.download webUUID key (Just file) Transfer.forwardRetry Transfer.noObserver $ const $ do
 						liftIO $ createDirectoryIfMissing True (parentDir tmp)
 						downloadUrl [videourl] tmp
 				if ok
@@ -297,7 +297,7 @@ downloadWith downloader dummykey u url file =
 			)
   where
 	runtransfer tmp =  Transfer.notifyTransfer Transfer.Download (Just file) $
-		Transfer.download u dummykey (Just file) Transfer.forwardRetry $ \p -> do
+		Transfer.download u dummykey (Just file) Transfer.forwardRetry Transfer.noObserver $ \p -> do
 			liftIO $ createDirectoryIfMissing True (parentDir tmp)
 			downloader tmp p
 

Command/Get.hs

@@ -90,6 +90,6 @@ getKeyFile' key afile dest = dispatch
 		| Remote.hasKeyCheap r =
 			either (const False) id <$> Remote.hasKey r key
 		| otherwise = return True
-	docopy r = download (Remote.uuid r) key afile noRetry $ \p -> do
+	docopy r = download (Remote.uuid r) key afile noRetry noObserver $ \p -> do
 		showAction $ "from " ++ Remote.name r
 		Remote.retrieveKeyFile r key afile dest p

Command/Move.hs

@@ -95,7 +95,7 @@ toPerform dest move key afile fastcheck isthere =
 		Right False -> do
 			showAction $ "to " ++ Remote.name dest
 			ok <- notifyTransfer Upload afile $
-				upload (Remote.uuid dest) key afile noRetry $
+				upload (Remote.uuid dest) key afile noRetry noObserver $
 					Remote.storeKey dest key afile
 			if ok
 				then do
@@ -152,7 +152,7 @@ fromPerform src move key afile = ifM (inAnnex key)
 	)
   where
 	go = notifyTransfer Download afile $ 
-		download (Remote.uuid src) key afile noRetry $ \p -> do
+		download (Remote.uuid src) key afile noRetry noObserver $ \p -> do
 			showAction $ "from " ++ Remote.name src
 			getViaTmp key $ \t -> Remote.retrieveKeyFile src key afile t p
 	dispatch _ False = stop -- failed

Command/SendKey.hs

@@ -44,7 +44,7 @@ fieldTransfer :: Direction -> Key -> (MeterUpdate -> Annex Bool) -> CommandStart
 fieldTransfer direction key a = do
 	afile <- Fields.getField Fields.associatedFile
 	ok <- maybe (a $ const noop)
-		(\u -> runner (Transfer direction (toUUID u) key) afile noRetry a)
+		(\u -> runner (Transfer direction (toUUID u) key) afile noRetry noObserver a)
 		=<< Fields.getField Fields.remoteUUID
 	liftIO $ exitBool ok
   where

Command/TransferKey.hs

@@ -42,7 +42,7 @@ start to from file key =
 
 toPerform :: Remote -> Key -> AssociatedFile -> CommandPerform
 toPerform remote key file = go Upload file $
-	upload (uuid remote) key file forwardRetry $ \p -> do
+	upload (uuid remote) key file forwardRetry noObserver $ \p -> do
 		ok <- Remote.storeKey remote key file p
 		when ok $
 			Remote.logStatus remote key InfoPresent
@@ -50,7 +50,7 @@ toPerform remote key file = go Upload file $
 
 fromPerform :: Remote -> Key -> AssociatedFile -> CommandPerform
 fromPerform remote key file = go Upload file $
-	download (uuid remote) key file forwardRetry $ \p ->
+	download (uuid remote) key file forwardRetry noObserver $ \p ->
 		getViaTmp key $ \t -> Remote.retrieveKeyFile remote key file t p
 
 go :: Direction -> AssociatedFile -> (NotifyWitness -> Annex Bool) -> CommandPerform

Command/TransferKeys.hs

@@ -36,14 +36,17 @@ start = do
   where
 	runner (TransferRequest direction remote key file)
 		| direction == Upload = notifyTransfer direction file $
-			upload (Remote.uuid remote) key file forwardRetry $ \p -> do
+			upload (Remote.uuid remote) key file forwardRetry observer $ \p -> do
 				ok <- Remote.storeKey remote key file p
 				when ok $
 					Remote.logStatus remote key InfoPresent
 				return ok
 		| otherwise = notifyTransfer direction file $
-			download (Remote.uuid remote) key file forwardRetry $ \p ->
+			download (Remote.uuid remote) key file forwardRetry observer $ \p ->
 				getViaTmp key $ \t -> Remote.retrieveKeyFile remote key file t p
+	
+	observer False t info = recordFailedTransfer t info
+	observer True _ _ = noop
 
 runRequests
 	:: Handle