make sync aware of adjusted branches

So, it will pull and push the original branch, not the adjusted one.

And, for merging, it will use updateAdjustedBranch (not implemented yet).

Note that remaining uses of Git.Branch.current need to be checked too;
for things that should act on the original branch, and not the adjusted
branch.

Command/Sync.hs

@@ -8,6 +8,8 @@
 
 module Command.Sync (
 	cmd,
+	CurrBranch,
+	getCurrBranch,
 	prepMerge,
 	mergeLocal,
 	mergeRemote,
@@ -43,6 +45,7 @@ import Annex.Drop
 import Annex.UUID
 import Logs.UUID
 import Annex.AutoMerge
+import Annex.AdjustedBranch
 import Annex.Ssh
 import Annex.BloomFilter
 import Utility.Bloom
@@ -95,20 +98,7 @@ seek :: SyncOptions -> CommandSeek
 seek o = allowConcurrentOutput $ do
 	prepMerge
 
-	-- There may not be a branch checked out until after the commit,
-	-- or perhaps after it gets merged from the remote, or perhaps
-	-- never.
-	-- So only look it up once it's needed, and once there is a
-	-- branch, cache it.
-	mvar <- liftIO newEmptyMVar
-	let getbranch = ifM (liftIO $ isEmptyMVar mvar)
-		( do
-			branch <- inRepo Git.Branch.current
-			when (isJust branch) $
-				liftIO $ putMVar mvar branch
-			return branch
-		, liftIO $ readMVar mvar
-		)
+	getbranch <- getCurrBranch 
 	let withbranch a = a =<< getbranch
 
 	remotes <- syncRemotes (syncWith o)
@@ -140,6 +130,35 @@ seek o = allowConcurrentOutput $ do
 	-- Pushes to remotes can run concurrently.
 	mapM_ (commandAction . withbranch . pushRemote o) gitremotes
 
+type CurrBranch = (Maybe Git.Branch, Maybe Adjustment)
+
+{- There may not be a branch checked out until after the commit,
+ - or perhaps after it gets merged from the remote, or perhaps
+ - never.
+ -
+ - So only look it up once it's needed, and once there is a
+ - branch, cache it.
+ -
+ - When on an adjusted branch, gets the original branch, and the adjustment.
+ -}
+getCurrBranch :: Annex (Annex CurrBranch)
+getCurrBranch = do
+	mvar <- liftIO newEmptyMVar
+	return $ ifM (liftIO $ isEmptyMVar mvar)
+		( do
+			currbranch <- inRepo Git.Branch.current
+			case currbranch of
+				Nothing -> return (Nothing, Nothing)
+				Just b -> do
+					let v = case adjustedToOriginal b of
+						Nothing -> (Just b, Nothing)
+						Just (adj, origbranch) ->
+							(Just origbranch, Just adj)
+					liftIO $ putMVar mvar v
+					return v
+		, liftIO $ readMVar mvar
+		)
+
 {- Merging may delete the current directory, so go to the top
  - of the repo. This also means that sync always acts on all files in the
  - repository, not just on a subdirectory. -}
@@ -216,9 +235,9 @@ commitStaged commitmode commitmessage = do
 	void $ inRepo $ Git.Branch.commit commitmode False commitmessage branch parents
 	return True
 
-mergeLocal :: Maybe Git.Ref -> CommandStart
-mergeLocal Nothing = stop
-mergeLocal (Just branch) = go =<< needmerge
+mergeLocal :: CurrBranch -> CommandStart
+mergeLocal (Nothing, _) = stop
+mergeLocal (Just branch, madj) = go =<< needmerge
   where
 	syncbranch = syncBranch branch
 	needmerge = ifM isBareRepo
@@ -231,16 +250,18 @@ mergeLocal (Just branch) = go =<< needmerge
 	go False = stop
 	go True = do
 		showStart "merge" $ Git.Ref.describe syncbranch
-		next $ next $ autoMergeFrom syncbranch (Just branch) Git.Branch.ManualCommit
+		next $ next $ case madj of
+			Nothing -> autoMergeFrom syncbranch (Just branch) Git.Branch.ManualCommit
+			Just adj -> updateAdjustedBranch adj branch syncbranch
 
-pushLocal :: Maybe Git.Ref -> CommandStart
+pushLocal :: CurrBranch -> CommandStart
 pushLocal b = do
 	updateSyncBranch b
 	stop
 
-updateSyncBranch :: Maybe Git.Ref -> Annex ()
-updateSyncBranch Nothing = noop
-updateSyncBranch (Just branch) = do
+updateSyncBranch :: CurrBranch -> Annex ()
+updateSyncBranch (Nothing, _) = noop
+updateSyncBranch (Just branch, _) = do
 	-- Update the sync branch to match the new state of the branch
 	inRepo $ updateBranch $ syncBranch branch
 	-- In direct mode, we're operating on some special direct mode
@@ -249,7 +270,7 @@ updateSyncBranch (Just branch) = do
 	whenM isDirect $
 		inRepo $ updateBranch $ fromDirectBranch branch
 
-updateBranch :: Git.Ref -> Git.Repo -> IO ()
+updateBranch :: Git.Branch -> Git.Repo -> IO ()
 updateBranch syncbranch g = 
 	unlessM go $ error $ "failed to update " ++ Git.fromRef syncbranch
   where
@@ -259,7 +280,7 @@ updateBranch syncbranch g =
 		, Param $ Git.fromRef $ Git.Ref.base syncbranch
 		] g
 
-pullRemote :: SyncOptions -> Remote -> Maybe Git.Ref -> CommandStart
+pullRemote :: SyncOptions -> Remote -> CurrBranch -> CommandStart
 pullRemote o remote branch = stopUnless (pure $ pullOption o) $ do
 	showStart "pull" (Remote.name remote)
 	next $ do
@@ -276,26 +297,27 @@ pullRemote o remote branch = stopUnless (pure $ pullOption o) $ do
  - were committed (or pushed changes, if this is a bare remote),
  - while the synced/master may have changes that some
  - other remote synced to this remote. So, merge them both. -}
-mergeRemote :: Remote -> Maybe Git.Ref -> CommandCleanup
+mergeRemote :: Remote -> CurrBranch -> CommandCleanup
 mergeRemote remote b = ifM isBareRepo
 	( return True
 	, case b of
-		Nothing -> do
+		(Nothing, _) -> do
 			branch <- inRepo Git.Branch.currentUnsafe
-			and <$> mapM (merge Nothing) (branchlist branch)
-		Just thisbranch -> do
-			inRepo $ updateBranch $ syncBranch thisbranch
-			and <$> (mapM (merge (Just thisbranch)) =<< tomerge (branchlist b))
+			and <$> mapM (merge Nothing Nothing) (branchlist branch)
+		(Just currbranch, madj) -> do
+			inRepo $ updateBranch $ syncBranch currbranch
+			and <$> (mapM (merge (Just currbranch) madj) =<< tomerge (branchlist (Just currbranch)))
 	)
   where
-	merge thisbranch br = autoMergeFrom (remoteBranch remote br) thisbranch Git.Branch.ManualCommit
+	merge (Just origbranch) (Just adj) br = updateAdjustedBranch adj origbranch br
+	merge currbranch _ br = autoMergeFrom (remoteBranch remote br) currbranch Git.Branch.ManualCommit
 	tomerge = filterM (changed remote)
 	branchlist Nothing = []
 	branchlist (Just branch) = [branch, syncBranch branch]
 
-pushRemote :: SyncOptions -> Remote -> Maybe Git.Ref -> CommandStart
-pushRemote _o _remote Nothing = stop
-pushRemote o remote (Just branch) = stopUnless (pure (pushOption o) <&&> needpush) $ do
+pushRemote :: SyncOptions -> Remote -> CurrBranch -> CommandStart
+pushRemote _o _remote (Nothing, _) = stop
+pushRemote o remote (Just branch, _) = stopUnless (pure (pushOption o) <&&> needpush) $ do
 	showStart "push" (Remote.name remote)
 	next $ next $ do
 		showOutput