add support for readonly remotes

Currently only the web special remote is readonly, but it'd be possible to
also have readonly drives, or other remotes. These are handled in the
assistant by only downloading from them, and never trying to upload to
them.

Assistant/DaemonStatus.hs

@@ -14,6 +14,7 @@ import Utility.ThreadScheduler
 import Utility.TempFile
 import Utility.NotificationBroadcaster
 import Logs.Transfer
+import Logs.Trust
 import qualified Remote
 
 import Control.Concurrent.STM
@@ -81,8 +82,13 @@ modifyDaemonStatus dstatus a = do
 	sendNotification $ changeNotifier s
 	return b
 
+{- Remotes ordered by cost, with dead ones thrown out. -}
 calcKnownRemotes :: Annex [Remote]
-calcKnownRemotes = concat . Remote.byCost <$> Remote.enabledRemoteList
+calcKnownRemotes = do
+	rs <- concat . Remote.byCost <$> Remote.enabledRemoteList
+	alive <- snd <$> trustPartition DeadTrusted (map Remote.uuid rs)
+	let good r = Remote.uuid r `elem` alive
+	return $ filter good rs
 
 {- Updates the cached ordered list of remotes from the list in Annex
  - state. -}

Assistant/Threads/Pusher.hs

@@ -16,6 +16,7 @@ import Assistant.DaemonStatus
 import Assistant.Sync
 import Utility.ThreadScheduler
 import qualified Remote
+import qualified Types.Remote as Remote
 
 import Data.Time.Clock
 
@@ -51,8 +52,8 @@ pushThread st dstatus commitchan pushmap = do
 		now <- getCurrentTime
 		if shouldPush now commits
 			then do
-				remotes <- filter (not . Remote.specialRemote) .
-					knownRemotes <$> getDaemonStatus dstatus
+				remotes <- filter pushable . knownRemotes
+					<$> getDaemonStatus dstatus
 				unless (null remotes) $ 
 					void $ alertWhile dstatus (pushAlert remotes) $
 						pushToRemotes thisThread now st (Just pushmap) remotes
@@ -63,6 +64,11 @@ pushThread st dstatus commitchan pushmap = do
 					, "commits"
 					]
 				refillCommits commitchan commits
+		where
+			pushable r
+				| Remote.specialRemote r = False
+				| Remote.readonly r = False
+				| otherwise = True
 
 {- Decide if now is a good time to push to remotes.
  -

Assistant/Threads/TransferScanner.hs

@@ -16,6 +16,7 @@ import Assistant.Alert
 import Logs.Transfer
 import Logs.Location
 import qualified Remote
+import qualified Types.Remote as Remote
 import Utility.ThreadScheduler
 import qualified Git.LsFiles as LsFiles
 import Command
@@ -122,6 +123,7 @@ expensiveScan st dstatus transferqueue rs = do
 				, use $ check Download True
 				)
 		check direction want key locs r
+			| direction == Upload && Remote.readonly r = Nothing
 			| (Remote.uuid r `elem` locs) == want = Just $
 				(r, Transfer direction (Remote.uuid r) key)
 			| otherwise = Nothing

Assistant/TransferQueue.hs

@@ -23,6 +23,7 @@ import Assistant.DaemonStatus
 import Logs.Transfer
 import Types.Remote
 import qualified Remote
+import qualified Types.Remote as Remote
 
 import Control.Concurrent.STM
 import qualified Data.Map as M
@@ -78,7 +79,7 @@ queueTransfers schedule q dstatus k f direction = do
 			-- can be uploaded to, in order to ensure all
 			-- remotes can access the content. Currently,
 			-- send to every remote we can.
-			| otherwise = return rs
+			| otherwise = return $ filter (not . Remote.readonly) rs
 		gentransfer r = Transfer
 			{ transferDirection = direction
 			, transferKey = k

Assistant/WebApp/Configurators.hs

@@ -12,12 +12,12 @@ module Assistant.WebApp.Configurators where
 import Assistant.Common
 import Assistant.WebApp
 import Assistant.WebApp.SideBar
+import Assistant.DaemonStatus
 import Assistant.Threads.MountWatcher (handleMount)
 import Utility.Yesod
 import qualified Remote
+import qualified Types.Remote as Remote
 import Remote.List
-import Logs.Web (webUUID)
-import Logs.Trust
 import Annex.UUID (getUUID)
 import Init
 import qualified Git
@@ -60,11 +60,11 @@ getRepositoriesR = bootstrap (Just Config) $ do
 {- A numbered list of known repositories, including the current one. -}
 repoList :: Handler [(String, String)]
 repoList = do
+	rs <- filter (not . Remote.readonly) . knownRemotes <$>
+		(liftIO . getDaemonStatus =<< daemonStatus <$> getYesod)
 	l <- runAnnex [] $ do
 		u <- getUUID
-		rs <- map Remote.uuid <$> Remote.remoteList
-		rs' <- snd <$> trustPartition DeadTrusted rs
-		Remote.prettyListUUIDs $ filter (/= webUUID) $ nub $ u:rs'
+		Remote.prettyListUUIDs $ nub $ u:(map Remote.uuid rs)
 	return $ zip counter l
 	where
 		counter = map show ([1..] :: [Int])

Remote/Bup.hs

@@ -64,6 +64,7 @@ gen r u c = do
 				then Just buprepo
 				else Nothing
 			, remotetype = remote
+			, readonly = False
 			}
 
 bupSetup :: UUID -> RemoteConfig -> Annex RemoteConfig

Remote/Directory.hs

@@ -54,6 +54,7 @@ gen r u c = do
 			config = Nothing,
 			repo = r,
 			localpath = Just dir,
+			readonly = False,
 			remotetype = remote
 		}
 	where

Remote/Git.hs

@@ -98,6 +98,7 @@ gen r u _ = new <$> remoteCost r defcst
 				then Just $ Git.repoPath r
 				else Nothing
 			, repo = r
+			, readonly = False
 			, remotetype = remote
 			}
 		

Remote/Hook.hs

@@ -50,6 +50,7 @@ gen r u c = do
 			config = Nothing,
 			localpath = Nothing,
 			repo = r,
+			readonly = False,
 			remotetype = remote
 		}
 

Remote/Rsync.hs

@@ -61,6 +61,7 @@ gen r u c = do
 			, localpath = if rsyncUrlIsPath $ rsyncUrl o
 				then Just $ rsyncUrl o
 				else Nothing
+			, readonly = False
 			, remotetype = remote
 			}
 

Remote/S3.hs

@@ -61,6 +61,7 @@ gen' r u c cst =
 			config = c,
 			repo = r,
 			localpath = Nothing,
+			readonly = False,
 			remotetype = remote
 		}
 

Remote/Web.hs

@@ -49,6 +49,7 @@ gen r _ _ =
 		config = Nothing,
 		localpath = Nothing,
 		repo = r,
+		readonly = True,
 		remotetype = remote
 	}
 

Types/Remote.hs

@@ -66,6 +66,8 @@ data RemoteA a = Remote {
 	repo :: Git.Repo,
 	-- a Remote can be assocated with a specific local filesystem path
 	localpath :: Maybe FilePath,
+	-- a Remote can be known to be readonly
+	readonly :: Bool,
 	-- the type of the remote
 	remotetype :: RemoteTypeA a
 }