When re-execing git-annex, use current program location, rather than ~/.config/git-annex/program, when possible.

Most of the time, there will be no discreprancy between programPath and
readProgramFile.

But, the programFile might have been written by an old version of git-annex
that is still installed, while a newer one is currently running. In this
case, we want to run the same one that's currently running.

This is especially important for things like the GIT_SSH=git-annex used for
ssh connection caching.

The only code that still uses readProgramFile directly is the upgrade code,
which needs to know where the standalone git-annex was installed, in order to
upgrade it.

Assistant/Threads/Cronner.hs

@@ -15,7 +15,7 @@ import Assistant.Common
 import Assistant.DaemonStatus
 import Utility.NotificationBroadcaster
 import Annex.UUID
-import Config.Files
+import Annex.Path
 import Logs.Schedule
 import Utility.Scheduled
 import Types.ScheduledActivity
@@ -181,7 +181,7 @@ runActivity urlrenderer activity nowt = do
 
 runActivity' :: UrlRenderer -> ScheduledActivity -> Assistant ()
 runActivity' urlrenderer (ScheduledSelfFsck _ d) = do
-	program <- liftIO $ readProgramFile
+	program <- liftIO programPath
 	g <- liftAnnex gitRepo
 	fsckresults <- showFscking urlrenderer Nothing $ tryNonAsync $ do
 		void $ batchCommand program (Param "fsck" : annexFsckParams d)
@@ -196,7 +196,7 @@ runActivity' urlrenderer (ScheduledRemoteFsck u s d) = dispatch =<< liftAnnex (r
 	dispatch Nothing = debug ["skipping remote fsck of uuid without a configured remote", fromUUID u, fromSchedule s]
 	dispatch (Just rmt) = void $ case Remote.remoteFsck rmt of
 		Nothing -> go rmt $ do
-			program <- readProgramFile
+			program <- programPath
 			void $ batchCommand program $ 
 				[ Param "fsck"
 				-- avoid downloading files

Assistant/Threads/RemoteControl.hs

@@ -9,7 +9,7 @@ module Assistant.Threads.RemoteControl where
 
 import Assistant.Common
 import RemoteDaemon.Types
-import Config.Files
+import Annex.Path
 import Utility.Batch
 import Utility.SimpleProtocol
 import Assistant.Alert
@@ -28,7 +28,7 @@ import qualified Data.Set as S
 
 remoteControlThread :: NamedThread
 remoteControlThread = namedThread "RemoteControl" $ do
-	program <- liftIO readProgramFile
+	program <- liftIO programPath
 	(cmd, params) <- liftIO $ toBatchCommand
 		(program, [Param "remotedaemon"])
 	let p = proc cmd (toCommand params)

Assistant/Threads/SanityChecker.hs

@@ -39,7 +39,7 @@ import Git.Index
 import Assistant.Unused
 import Logs.Unused
 import Logs.Transfer
-import Config.Files
+import Annex.Path
 import Types.Key (keyBackendName)
 import qualified Annex
 #ifdef WITH_WEBAPP
@@ -182,7 +182,7 @@ dailyCheck urlrenderer = do
 	{- Run git-annex unused once per day. This is run as a separate
 	 - process to stay out of the annex monad and so it can run as a
 	 - batch job. -}
-	program <- liftIO readProgramFile
+	program <- liftIO programPath
 	let (program', params') = batchmaker (program, [Param "unused"])
 	void $ liftIO $ boolSystem program' params'
 	{- Invalidate unused keys cache, and queue transfers of all unused

Assistant/Threads/Transferrer.hs

@@ -11,13 +11,13 @@ import Assistant.Common
 import Assistant.TransferQueue
 import Assistant.TransferSlots
 import Logs.Transfer
-import Config.Files
+import Annex.Path
 import Utility.Batch
 
 {- Dispatches transfers from the queue. -}
 transfererThread :: NamedThread
 transfererThread = namedThread "Transferrer" $ do
-	program <- liftIO readProgramFile
+	program <- liftIO programPath
 	batchmaker <- liftIO getBatchCommandMaker
 	forever $ inTransferSlot program batchmaker $
 		maybe (return Nothing) (uncurry genTransfer)