Avoid error about git-annex-shell not being found when syncing with -J with a git remote where git-annex-shell is not installed.

This commit was sponsored by andrea rota.

Annex/Ssh.hs

@@ -193,8 +193,10 @@ prepSocket socketfile gc sshparams = do
 
 	c <- Annex.getState Annex.concurrency
 	case c of
-		Concurrent {} -> makeconnection socketlock
-		NonConcurrent -> return ()
+		Concurrent {}
+			| annexUUID (remoteGitConfig gc) /= NoUUID ->
+				makeconnection socketlock
+		_ -> return ()
 	
 	lockFileCached socketlock
   where
@@ -207,11 +209,15 @@ prepSocket socketfile gc sshparams = do
 			-- When we can start the connection in batch mode,
 			-- ssh won't prompt to the console.
 			(_, connected) <- liftIO $ processTranscript "ssh"
-				(["-o", "BatchMode=true"] ++ toCommand startps)
+				(["-o", "BatchMode=true"]
+				++ toCommand startps)
 				Nothing
-			unless connected $ 
-				prompt $ void $ liftIO $
+			unless connected $ do
+				ok <- prompt $ liftIO $
 					boolSystem "ssh" startps
+				unless ok $
+					warning $ "Unable to run git-annex-shell on remote " ++
+						Git.repoDescribe (gitConfigRepo (remoteGitConfig gc))
 
 -- Parameters to get ssh connected to the remote host,
 -- by asking it to run a no-op command.

CHANGELOG

@@ -16,6 +16,9 @@ git-annex (6.20170520) UNRELEASED; urgency=medium
     disable the usual automatic merge conflict resolution done by git-annex
     sync and the assistant.
   * sync: Added --no-resolvemerge option.
+  * Avoid error about git-annex-shell not being found when
+    syncing with -J with a git remote where git-annex-shell is not
+    installed.
 
  -- Joey Hess <id@joeyh.name>  Wed, 24 May 2017 14:03:40 -0400
 

doc/bugs/bash__58___git-annex-shell__58___command_not_found/comment_1_461a8d85738d63f9d276bb33d5c24255._comment

@@ -0,0 +1,27 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2017-06-06T16:21:53Z"
+ content="""
+One of the remotes of your repository is on a host
+where git-annex-shell is either not installed, or perhaps
+it is installed but `ssh thehost git-annex-shell` does not
+work -- eg due to the problem decribed in
+[[tips/get_git-annex-shell_into_PATH]].
+
+There was indeed a change in 6.20170519 that explains why this
+only happens in -J mode. [[!commit 6992fe133b37ec6d64498f3dd2c69613c4c37469]]
+made it run git-annex-shell at startup in that mode.
+
+Hmm, I suppose one of your remotes could intentionally not have
+git-annex-shell on it, and yet you'd still want `git annex sync`
+to work to it, and so this message about git-annex-shell
+being displayed is not ideal.
+
+So, I've made it skip trying to run git-annex-shell in this case unless
+the remote has an annex-uuid set. If the remote has never had
+git-annex-shell installed, it can't have an annex-uuid set.
+
+And, when it does fail to run git-annex-shell, I've made it say which 
+remote it was unable to run it on.
+"""]]