git-annex-shell: Added notifychanges command.

This will be used by the remote-daemon to quickly tell when changes have
been pushed from some other repository into a ssh remote.

Adjusted the remote-daemon protocol to communicate changed shas, rather
than git branch refs. This way, it can easily check if a sha is new.

This commit was sponsored by Carlos Trijueque Albarran.

RemoteDaemon/EndPoint/GitAnnexShell/Types.hs

@@ -0,0 +1,32 @@
+{- git-remote-daemon, git-annex-shell endpoint, datatypes
+ -
+ - Copyright 2014 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module RemoteDaemon.EndPoint.GitAnnexShell.Types (
+	Notification(..),
+	Proto.serialize,
+	Proto.deserialize,
+	Proto.formatMessage,
+) where
+
+import qualified Utility.SimpleProtocol as Proto
+import RemoteDaemon.Types (ShaList)
+
+data Notification
+	= READY
+	| CHANGED ShaList
+
+instance Proto.Sendable Notification where
+	formatMessage READY = ["READY"]
+	formatMessage (CHANGED shas) = ["CHANGED", Proto.serialize shas]
+
+instance Proto.Receivable Notification where
+	parseCommand "READY" = Proto.parse0 READY
+	parseCommand "CHANGED" = Proto.parse1 CHANGED
+	parseCommand _ = Proto.parseFail

RemoteDaemon/Endpoint/GitAnnexShell/Types.hs

@@ -1,29 +0,0 @@
-{- git-remote-daemon, git-annex-shell endpoint, datatypes
- -
- - Copyright 2014 Joey Hess <joey@kitenet.net>
- -
- - Licensed under the GNU GPL version 3 or higher.
- -}
-
-{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-
-module RemoteDaemon.EndPoint.GitAnnexShell.Types where
-
-import Common.Annex
-import qualified Git.Types as Git
-import qualified Utility.SimpleProtocol as Proto
-import RemoteDaemon.Types (RemoteName, RefList)
-
-data Notifications
-	= CHANGED RemoteName RefList
-
-instance Proto.Sendable Notifications where
-	formatMessage (CHANGED remote refs) =
-		["CHANGED"
-		, Proto.serialize remote
-		, Proto.serialize refs
-		]
-
-instance Proto.Receivable Notifications where
-	parseCommand "CHANGED" = Proto.parse2 CHANGED

RemoteDaemon/Types.hs

@@ -10,13 +10,14 @@
 
 module RemoteDaemon.Types where
 
-import Common.Annex
 import qualified Git.Types as Git
 import qualified Utility.SimpleProtocol as Proto
 
 -- Messages that the daemon emits.
 data Emitted
-	= CHANGED RemoteName RefList
+	= CONNECTED RemoteName
+	| DISCONNECTED RemoteName
+	| CHANGED RemoteName ShaList
 	| STATUS RemoteName UserMessage
 	| ERROR RemoteName UserMessage
 
@@ -29,13 +30,17 @@ data Consumed
 
 type RemoteName = String
 type UserMessage = String
-type RefList = [Git.Ref]
+type ShaList = [Git.Sha]
 
 instance Proto.Sendable Emitted where
-	formatMessage (CHANGED remote refs) =
+	formatMessage (CONNECTED remote) =
+		["CONNECTED", Proto.serialize remote]
+	formatMessage (DISCONNECTED remote) =
+		["DISCONNECTED", Proto.serialize remote]
+	formatMessage (CHANGED remote shas) =
 		["CHANGED"
 		, Proto.serialize remote
-		, Proto.serialize refs
+		, Proto.serialize shas
 		]
 	formatMessage (STATUS remote msg) =
 		["STATUS"
@@ -55,6 +60,8 @@ instance Proto.Sendable Consumed where
 	formatMessage RELOAD = ["RELOAD"]
 
 instance Proto.Receivable Emitted where
+	parseCommand "CONNECTED" = Proto.parse1 CONNECTED
+	parseCommand "DISCONNECTED" = Proto.parse1 DISCONNECTED
 	parseCommand "CHANGED" = Proto.parse2 CHANGED
 	parseCommand "STATUS" = Proto.parse2 STATUS
 	parseCommand "ERROR" = Proto.parse2 ERROR
@@ -71,6 +78,6 @@ instance Proto.Serializable [Char] where
 	serialize = id
 	deserialize = Just
 
-instance Proto.Serializable RefList where
+instance Proto.Serializable ShaList where
 	serialize = unwords . map Git.fromRef
 	deserialize = Just . map Git.Ref . words