only run sshCleanup when the command actually used ssh connection caching

Optimises query commands that do not. More importantly, avoids any ssh
connection cleanup delay causing problems at the end of such commands.

Annex/Ssh.hs

@@ -9,7 +9,6 @@
 
 module Annex.Ssh (
 	sshCachingOptions,
-	sshCleanup,
 	sshCacheDir,
 	sshReadPort,
 ) where
@@ -24,6 +23,7 @@ import qualified Build.SysConfig as SysConfig
 import qualified Annex
 import Config
 import Utility.Env
+import Types.CleanupActions
 #ifndef mingw32_HOST_OS
 import Annex.Perms
 #endif
@@ -31,7 +31,9 @@ import Annex.Perms
 {- Generates parameters to ssh to a given host (or user@host) on a given
  - port, with connection caching. -}
 sshCachingOptions :: (String, Maybe Integer) -> [CommandParam] -> Annex [CommandParam]
-sshCachingOptions (host, port) opts = go =<< sshInfo (host, port)
+sshCachingOptions (host, port) opts = do
+	Annex.addCleanup SshCachingCleanup sshCleanup
+	go =<< sshInfo (host, port)
   where
 	go (Nothing, params) = ret params
 	go (Just socketfile, params) = do
@@ -146,6 +148,7 @@ sshCleanup = go =<< sshCacheDir
 					[ Params "-O stop"
 					] ++ params ++ [Param "any"])
 					{ cwd = Just dir }
+		liftIO $ nukeFile socketfile
 		-- Cannot remove the lock file; other processes may
 		-- be waiting on our exclusive lock to use it.