propagate git-annex -c on to transferrer child process

git -c was already propagated via environment, but need this for
consistency.

Also, notice it does not use gitAnnexChildProcess to run the
transferrer. So nothing is done about avoid it taking the
pid lock. It's possible that the caller is already doing something that
took the pid lock, and if so, the transferrer will certianly fail,
since it needs to take the pid lock too. This may prevent combining
annex.stalldetection with annex.pidlock, but I have not verified it's
really a problem. If it was, it seems git-annex would have to take
the pid lock when starting a transferrer, and hold it until shutdown,
or would need to take pid lock when starting to use a transferrer,
and hold it until done with a transfer and then drop it. The latter
would require starting the transferrer with pid locking disabled for the
child process, so assumes that the transferrer does not do anyting that
needs locking when not running a transfer.

Annex/Init.hs

@@ -384,7 +384,7 @@ autoEnableSpecialRemotes :: Annex ()
 autoEnableSpecialRemotes = do
 	rp <- fromRawFilePath <$> fromRepo Git.repoPath
 	withNullHandle $ \nullh -> gitAnnexChildProcess "init"
-		[ "--autoenable" ]
+		[ Param "--autoenable" ]
 		(\p -> p
 			{ std_out = UseHandle nullh
 			, std_err = UseHandle nullh

Annex/Path.hs

@@ -57,13 +57,21 @@ cannotFindProgram = do
  -}
 gitAnnexChildProcess
 	:: String
-	-> [String]
+	-> [CommandParam]
 	-> (CreateProcess -> CreateProcess)
 	-> (Maybe Handle -> Maybe Handle -> Maybe Handle -> ProcessHandle -> IO a)
 	-> Annex a
 gitAnnexChildProcess subcmd ps f a = do
 	cmd <- liftIO programPath
-	-- Pass along git config values that were set on command line
-	-- to the child process.
-	cps <- concatMap (\c -> ["-c", c]) <$> Annex.getGitConfigOverrides
-	pidLockChildProcess cmd (subcmd:cps++ps) f a
+	ps' <- gitAnnexChildProcessParams subcmd ps
+	pidLockChildProcess cmd ps' f a
+
+{- Parameters to pass to a git-annex child process to run a subcommand
+ - with some parameters.
+ -
+ - Includes -c values that were passed on the git-annex command line.
+ -}
+gitAnnexChildProcessParams :: String -> [CommandParam] -> Annex [CommandParam]
+gitAnnexChildProcessParams subcmd ps = do
+	cps <- concatMap (\c -> [Param "-c", Param c]) <$> Annex.getGitConfigOverrides
+	return (Param subcmd : cps ++ ps)

Annex/PidLock.hs

@@ -38,12 +38,12 @@ import Config
  -}
 pidLockChildProcess
 	:: FilePath
-	-> [String]
+	-> [CommandParam]
 	-> (CreateProcess -> CreateProcess)
 	-> (Maybe Handle -> Maybe Handle -> Maybe Handle -> ProcessHandle -> IO a)
 	-> Annex a
 pidLockChildProcess cmd ps f a = do
-	let p = f (proc cmd ps)
+	let p = f (proc cmd (toCommand ps))
 	let gonopidlock = withCreateProcess p a
 #ifndef mingw32_HOST_OS
 	pidLockFile >>= liftIO . \case

Annex/TransferrerPool.hs

@@ -41,14 +41,22 @@ import System.Posix.Process (getProcessGroupIDOf)
 
 type SignalActionsVar = TVar (M.Map SignalAction (Int -> IO ()))
 
+data RunTransferrer = RunTransferrer String [CommandParam] BatchCommandMaker
+
+mkRunTransferrer :: BatchCommandMaker -> Annex RunTransferrer
+mkRunTransferrer batchmaker = RunTransferrer
+	<$> liftIO programPath
+	<*> gitAnnexChildProcessParams "transferrer" []
+	<*> pure batchmaker
+
 {- Runs an action with a Transferrer from the pool. -}
 withTransferrer :: (Transferrer -> Annex a) -> Annex a
 withTransferrer a = do
-	program <- liftIO programPath
+	rt <- mkRunTransferrer nonBatchCommandMaker
 	pool <- Annex.getState Annex.transferrerpool
 	let nocheck = pure (pure True)
 	signalactonsvar <- Annex.getState Annex.signalactions
-	withTransferrer' False signalactonsvar nocheck program nonBatchCommandMaker pool a
+	withTransferrer' False signalactonsvar nocheck rt pool a
 
 withTransferrer'
 	:: (MonadIO m, MonadMask m)
@@ -59,19 +67,18 @@ withTransferrer'
 	-- processes are left in the pool for use later.
 	-> SignalActionsVar
 	-> MkCheckTransferrer
-	-> FilePath
-	-> BatchCommandMaker
+	-> RunTransferrer
 	-> TransferrerPool
 	-> (Transferrer -> m a)
 	-> m a
-withTransferrer' minimizeprocesses signalactonsvar mkcheck program batchmaker pool a = do
+withTransferrer' minimizeprocesses signalactonsvar mkcheck rt pool a = do
 	(mi, leftinpool) <- liftIO $ atomically (popTransferrerPool pool)
 	(i@(TransferrerPoolItem _ check), t) <- liftIO $ case mi of
 		Nothing -> do
-			t <- mkTransferrer signalactonsvar program batchmaker
+			t <- mkTransferrer signalactonsvar rt
 			i <- mkTransferrerPoolItem mkcheck t
 			return (i, t)
-		Just i -> checkTransferrerPoolItem signalactonsvar program batchmaker i
+		Just i -> checkTransferrerPoolItem signalactonsvar rt i
 	a t `finally` returntopool leftinpool check t i
   where
 	returntopool leftinpool check t i
@@ -87,8 +94,8 @@ withTransferrer' minimizeprocesses signalactonsvar mkcheck program batchmaker po
 
 {- Check if a Transferrer from the pool is still ok to be used.
  - If not, stop it and start a new one. -}
-checkTransferrerPoolItem :: SignalActionsVar -> FilePath -> BatchCommandMaker -> TransferrerPoolItem -> IO (TransferrerPoolItem, Transferrer)
-checkTransferrerPoolItem signalactonsvar program batchmaker i = case i of
+checkTransferrerPoolItem :: SignalActionsVar -> RunTransferrer -> TransferrerPoolItem -> IO (TransferrerPoolItem, Transferrer)
+checkTransferrerPoolItem signalactonsvar rt i = case i of
 	TransferrerPoolItem (Just t) check -> ifM check
 		( return (i, t)
 		, do
@@ -98,7 +105,7 @@ checkTransferrerPoolItem signalactonsvar program batchmaker i = case i of
 	TransferrerPoolItem Nothing check -> new check
   where
 	new check = do
-		t <- mkTransferrer signalactonsvar program batchmaker
+		t <- mkTransferrer signalactonsvar rt
 		return (TransferrerPoolItem (Just t) check, t)
 
 data TransferRequestLevel = AnnexLevel | AssistantLevel
@@ -203,10 +210,10 @@ detectStalls (Just (StallDetection minsz duration)) metervar onstall = go Nothin
 
 {- Starts a new git-annex transfer process, setting up handles
  - that will be used to communicate with it. -}
-mkTransferrer :: SignalActionsVar -> FilePath -> BatchCommandMaker -> IO Transferrer
-mkTransferrer signalactonsvar program batchmaker = do
+mkTransferrer :: SignalActionsVar -> RunTransferrer -> IO Transferrer
+mkTransferrer signalactonsvar (RunTransferrer program params batchmaker) = do
 	{- It runs as a batch job. -}
-	let (program', params') = batchmaker (program, [Param "transferrer"])
+	let (program', params') = batchmaker (program, params)
 	{- It's put into its own group so that the whole group can be
 	 - killed to stop a transfer. -}
 	(Just writeh, Just readh, _, ph) <- createProcess

Assistant/Threads/Transferrer.hs

@@ -11,15 +11,15 @@ import Assistant.Common
 import Assistant.TransferQueue
 import Assistant.TransferSlots
 import Types.Transfer
-import Annex.Path
+import Annex.TransferrerPool
 import Utility.Batch
 
 {- Dispatches transfers from the queue. -}
 transfererThread :: NamedThread
 transfererThread = namedThread "Transferrer" $ do
-	program <- liftIO programPath
-	batchmaker <- liftIO getBatchCommandMaker
-	forever $ inTransferSlot program batchmaker $
+	rt <- liftAnnex . mkRunTransferrer
+		=<< liftIO getBatchCommandMaker
+	forever $ inTransferSlot rt $
 		maybe (return Nothing) (uncurry genTransfer)
 			=<< getNextTransfer notrunning
   where

Assistant/TransferSlots.hs

@@ -34,7 +34,6 @@ import qualified Remote
 import qualified Types.Remote as Remote
 import Annex.Content
 import Annex.Wanted
-import Annex.Path
 import Utility.Batch
 import Types.NumCopies
 
@@ -55,17 +54,17 @@ type TransferGenerator = Assistant (Maybe (Transfer, TransferInfo, Transferrer -
 {- Waits until a transfer slot becomes available, then runs a
  - TransferGenerator, and then runs the transfer action in its own thread. 
  -}
-inTransferSlot :: FilePath -> BatchCommandMaker -> TransferGenerator -> Assistant ()
-inTransferSlot program batchmaker gen = do
+inTransferSlot :: RunTransferrer -> TransferGenerator -> Assistant ()
+inTransferSlot rt gen = do
 	flip MSemN.wait 1 <<~ transferSlots
-	runTransferThread program batchmaker =<< gen
+	runTransferThread rt =<< gen
 
 {- Runs a TransferGenerator, and its transfer action,
  - without waiting for a slot to become available. -}
-inImmediateTransferSlot :: FilePath -> BatchCommandMaker -> TransferGenerator -> Assistant ()
-inImmediateTransferSlot program batchmaker gen = do
+inImmediateTransferSlot :: RunTransferrer -> TransferGenerator -> Assistant ()
+inImmediateTransferSlot rt gen = do
 	flip MSemN.signal (-1) <<~ transferSlots
-	runTransferThread program batchmaker =<< gen
+	runTransferThread rt =<< gen
 
 {- Runs a transfer action, in an already allocated transfer slot.
  - Once it finishes, frees the transfer slot.
@@ -77,25 +76,25 @@ inImmediateTransferSlot program batchmaker gen = do
  - then pausing the thread until a ResumeTransfer exception is raised,
  - then rerunning the action.
  -}
-runTransferThread :: FilePath -> BatchCommandMaker -> Maybe (Transfer, TransferInfo, Transferrer -> Assistant ()) -> Assistant ()
-runTransferThread _ _ Nothing = flip MSemN.signal 1 <<~ transferSlots
-runTransferThread program batchmaker (Just (t, info, a)) = do
+runTransferThread :: RunTransferrer -> Maybe (Transfer, TransferInfo, Transferrer -> Assistant ()) -> Assistant ()
+runTransferThread _ Nothing = flip MSemN.signal 1 <<~ transferSlots
+runTransferThread rt (Just (t, info, a)) = do
 	d <- getAssistant id
 	mkcheck <- checkNetworkConnections 
 		<$> getAssistant daemonStatusHandle
 	aio <- asIO1 a
-	tid <- liftIO $ forkIO $ runTransferThread' mkcheck program batchmaker d aio
+	tid <- liftIO $ forkIO $ runTransferThread' mkcheck rt d aio
 	updateTransferInfo t $ info { transferTid = Just tid }
 
-runTransferThread' :: MkCheckTransferrer -> FilePath -> BatchCommandMaker -> AssistantData -> (Transferrer -> IO ()) -> IO ()
-runTransferThread' mkcheck program batchmaker d run = go
+runTransferThread' :: MkCheckTransferrer -> RunTransferrer -> AssistantData -> (Transferrer -> IO ()) -> IO ()
+runTransferThread' mkcheck rt d run = go
   where
 	go = catchPauseResume $ do
 		p <- runAssistant d $ liftAnnex $ 
 			Annex.getState Annex.transferrerpool
 		signalactonsvar <- runAssistant d $ liftAnnex $
 			Annex.getState Annex.signalactions
-		withTransferrer' True signalactonsvar mkcheck program batchmaker p run
+		withTransferrer' True signalactonsvar mkcheck rt p run
 	pause = catchPauseResume $
 		runEvery (Seconds 86400) noop
 	{- Note: This must use E.try, rather than E.catch.
@@ -303,9 +302,9 @@ startTransfer t = do
 		alterTransferInfo t $ \i -> i { transferPaused = False }
 		liftIO $ throwTo tid ResumeTransfer
 	start info = do
-		program <- liftIO programPath
-		batchmaker <- liftIO getBatchCommandMaker
-		inImmediateTransferSlot program batchmaker $
+		rt <- liftAnnex . mkRunTransferrer
+			=<< liftIO getBatchCommandMaker
+		inImmediateTransferSlot rt $
 			genTransfer t info
 
 getCurrentTransfers :: Assistant TransferMap

Upgrade.hs

@@ -104,8 +104,8 @@ upgrade automatic destversion = do
 	upgraderemote = do
 		rp <- fromRawFilePath <$> fromRepo Git.repoPath
 		gitAnnexChildProcess "upgrade"
-			[ "--quiet"
-			, "--autoonly"
+			[ Param "--quiet"
+			, Param "--autoonly"
 			]
 			(\p -> p { cwd = Just rp })
 			(\_ _ _ pid -> waitForProcess pid >>= return . \case

doc/todo/git-annex_transferrer_does_not_propigate_-c.mdwn

@@ -1,6 +1,12 @@
-When `git -c foo.bar annex` runs git-annex transferrer,
+When `git annex -c foo.bar` runs git-annex transferrer,
 it does not pass along the settings from -c.
 
+(Note that, `git -c foo.bar annex` does propagate the -c. Git does it by
+setting an environment variable, which causes git config to reflect the
+override. The environment variable propagates to child processes.)
+
 There are a lot of config settings that impact transfers,
 and some of them might be commonly used at the command line, so something
 needs to be done about this. --[[Joey]]
+
+> [[done]]