add VerifiedCopy data type

There should be no behavior changes in this commit, it just adds a more
expressive data type and adjusts code that had been passing around a [UUID]
or sometimes a Maybe Remote to instead use [VerifiedCopy].

Although, since some functions were taking two different [UUID] lists,
there's some potential for me to have gotten it horribly wrong.

Assistant/Drop.hs

@@ -15,11 +15,12 @@ import Assistant.DaemonStatus
 import Annex.Drop (handleDropsFrom, Reason)
 import Logs.Location
 import CmdLine.Action
+import Types.NumCopies
 
 {- Drop from local and/or remote when allowed by the preferred content and
  - numcopies settings. -}
-handleDrops :: Reason -> Bool -> Key -> AssociatedFile -> Maybe Remote -> Assistant ()
-handleDrops reason fromhere key f knownpresentremote = do
+handleDrops :: Reason -> Bool -> Key -> AssociatedFile -> [VerifiedCopy] -> Assistant ()
+handleDrops reason fromhere key f preverified = do
 	syncrs <- syncDataRemotes <$> getDaemonStatus
 	locs <- liftAnnex $ loggedLocations key
-	liftAnnex $ handleDropsFrom locs syncrs reason fromhere key f knownpresentremote callCommandAction
+	liftAnnex $ handleDropsFrom locs syncrs reason fromhere key f preverified callCommandAction

Assistant/Threads/Committer.hs

@@ -479,7 +479,7 @@ checkChangeContent change@(Change { changeInfo = i }) =
 			void $ if present
 				then queueTransfers "new file created" Next k (Just f) Upload
 				else queueTransfers "new or renamed file wanted" Next k (Just f) Download
-			handleDrops "file renamed" present k (Just f) Nothing
+			handleDrops "file renamed" present k (Just f) []
   where
 	f = changeFile change
 checkChangeContent _ = noop

Assistant/Threads/SanityChecker.hs

@@ -191,7 +191,7 @@ dailyCheck urlrenderer = do
 	void $ liftAnnex $ setUnusedKeys unused
 	forM_ unused $ \k -> do
 		unlessM (queueTransfers "unused" Later k Nothing Upload) $
-			handleDrops "unused" True k Nothing Nothing
+			handleDrops "unused" True k Nothing []
 
 	return True
   where

Assistant/Threads/TransferScanner.hs

@@ -157,7 +157,7 @@ expensiveScan urlrenderer rs = batch <~> do
 		present <- liftAnnex $ inAnnex key
 		liftAnnex $ handleDropsFrom locs syncrs
 			"expensive scan found too many copies of object"
-			present key (Just f) Nothing callCommandAction
+			present key (Just f) [] callCommandAction
 		liftAnnex $ do
 			let slocs = S.fromList locs
 			let use a = return $ mapMaybe (a key slocs) syncrs

Assistant/TransferSlots.hs

@@ -30,6 +30,7 @@ import Annex.Content
 import Annex.Wanted
 import Annex.Path
 import Utility.Batch
+import Types.NumCopies
 
 import qualified Data.Map as M 
 import qualified Control.Exception as E
@@ -160,7 +161,7 @@ genTransfer t info = case transferRemote info of
 					("object uploaded to " ++ show remote)
 					True (transferKey t)
 					(associatedFile info)
-					(Just remote)
+					[VerifiedCopy (Remote.uuid remote)]
 			void recordCommit
 		, whenM (liftAnnex $ isNothing <$> checkTransfer t) $
 			void $ removeTransfer t
@@ -225,7 +226,7 @@ finishedTransfer t (Just info)
   where
 	dodrops fromhere = handleDrops
 		("drop wanted after " ++ describeTransfer t info)
-		fromhere (transferKey t) (associatedFile info) Nothing
+		fromhere (transferKey t) (associatedFile info) []
 finishedTransfer _ _ = noop
 
 {- Pause a running transfer. -}