configure: Check if ssh connection caching is supported by the installed version of ssh and default annex.sshcaching accordingly.

Annex/Content.hs

@@ -313,7 +313,8 @@ saveState :: Bool -> Annex ()
 saveState oneshot = do
 	Annex.Queue.flush False
 	unless oneshot $ do
-		alwayscommit <- Git.configTrue <$> fromRepo (Git.Config.get "annex.alwayscommit" "true")
+		alwayscommit <- fromMaybe True . Git.configTrue
+			<$> fromRepo (Git.Config.get "annex.alwayscommit" "")
 		if alwayscommit
 			then Annex.Branch.commit "update"
 			else Annex.Branch.stage

Annex/Ssh.hs

@@ -16,6 +16,7 @@ import Common.Annex
 import Annex.LockPool
 import qualified Git
 import qualified Git.Config
+import qualified Build.SysConfig as SysConfig
 
 {- Generates parameters to ssh to a given host (or user@host) on a given
  - port, with connection caching. -}
@@ -37,7 +38,8 @@ sshParams (host, port) opts = go =<< sshInfo (host, port)
 
 sshInfo :: (String, Maybe Integer) -> Annex (Maybe FilePath, [CommandParam])
 sshInfo (host, port) = do
-	caching <- Git.configTrue <$> fromRepo (Git.Config.get "annex.sshcaching" "true")
+	caching <- fromMaybe SysConfig.sshconnectioncaching . Git.configTrue
+		<$> fromRepo (Git.Config.get "annex.sshcaching" "")
 	if caching
 		then do
 			dir <- fromRepo gitAnnexSshDir

Config.hs

@@ -69,7 +69,7 @@ prop_cost_sane = False `notElem`
 
 {- Checks if a repo should be ignored. -}
 repoNotIgnored :: Git.Repo -> Annex Bool
-repoNotIgnored r = not . Git.configTrue <$> getConfig r "ignore" "false"
+repoNotIgnored r = not . fromMaybe False . Git.configTrue <$> getConfig r "ignore" ""
 
 {- If a value is specified, it is used; otherwise the default is looked up
  - in git config. forcenumcopies overrides everything. -}

Git.hs

@@ -85,7 +85,8 @@ assertLocal repo action =
 		else error $ "acting on non-local git repo " ++  repoDescribe repo ++ 
 				" not supported"
 configBare :: Repo -> Bool
-configBare repo = maybe unknown configTrue $ M.lookup "core.bare" $ config repo
+configBare repo = maybe unknown (fromMaybe False . configTrue) $
+	M.lookup "core.bare" $ config repo
 	where
 		unknown = error $ "it is not known if git repo " ++
 			repoDescribe repo ++
@@ -112,5 +113,10 @@ workTree Repo { location = Dir d } = d
 workTree Repo { location = Unknown } = undefined
 
 {- Checks if a string from git config is a true value. -}
-configTrue :: String -> Bool
+configTrue :: String -> Maybe Bool
-configTrue s = map toLower s == "true"
+configTrue s
+	| s' == "true" = Just True
+	| s' == "false" = Just False
+	| otherwise = Nothing
+	where
+		s' = map toLower s

configure.hs

@@ -4,9 +4,11 @@ import System.Directory
 import Data.List
 import Data.Maybe
 import System.Cmd.Utils
+import Control.Applicative
 
 import Build.TestConfig
 import Utility.StatFS
+import Utility.SafeCommand
 
 tests :: [TestCase]
 tests =
@@ -23,6 +25,7 @@ tests =
 	, TestCase "wget" $ testCmd "wget" "wget --version >/dev/null"
 	, TestCase "bup" $ testCmd "bup" "bup --version >/dev/null"
 	, TestCase "gpg" $ testCmd "gpg" "gpg --version >/dev/null"
+	, TestCase "ssh connection caching" getSshConnectionCaching
 	, TestCase "StatFS" testStatFS
 	] ++ shaTestCases [1, 256, 512, 224, 384]
 
@@ -66,6 +69,10 @@ getGitVersion = do
 	let version = last $ words $ head $ lines s
 	return $ Config "gitversion" (StringConfig version)
 
+getSshConnectionCaching :: Test
+getSshConnectionCaching = Config "sshconnectioncaching" . BoolConfig <$>
+	boolSystem "sh" [Param "-c", Param "ssh -o ControlPersist=yes -V >/dev/null 2>/dev/null"]
+
 testStatFS :: Test
 testStatFS = do
 	s <- getFileSystemStats "."

debian/changelog

@@ -34,6 +34,8 @@ git-annex (3.20120124) UNRELEASED; urgency=low
   * To avoid commits of data to the git-annex branch after each command
     is run, set annex.alwayscommit=false. Its data will then be committed
     less frequently, when a merge or sync is done.
+  * configure: Check if ssh connection caching is supported by the installed
+    version of ssh and default annex.sshcaching accordingly.
 
  -- Joey Hess <joeyh@debian.org>  Tue, 24 Jan 2012 16:21:55 -0400
 

debian/control

@@ -23,6 +23,7 @@ Build-Depends:
 	git,
 	uuid,
 	rsync,
+	openssh-client,
 Maintainer: Joey Hess <joeyh@debian.org>
 Standards-Version: 3.9.2
 Vcs-Git: git://git.kitenet.net/git-annex

doc/git-annex.mdwn

@@ -604,7 +604,8 @@ Here are all the supported configuration settings.
 
 * `annex.sshcaching`
 
-  By default, git-annex caches ssh connections. To disable this, set to `false`.
+  By default, git-annex caches ssh connections
+  (if built using a new enough ssh). To disable this, set to `false`.
 
 * `annex.alwayscommit`