install a git-annex-shell shim script when the standalone OSX app runs

I put it in ~/.ssh/ because there's no reliable way to get it into PATH,
and OSX ssh doesn't even honor user's PATH by default.

authorized_keys generators will need to check if it's there. Not done yet.

Assistant/Install.hs

@@ -7,26 +7,30 @@
 
 module Assistant.Install where
 
+import Assistant.Common
+import Assistant.Install.AutoStart
+import Assistant.Ssh
 import Locations.UserConfig
+import Utility.FileMode
 import Utility.OSX
-import Utility.Path
 
 import System.Posix.Env
-import System.Directory
 
 {- The OSX git-annex.app does not have an installation process.
  - So when it's run, it needs to set up autostarting of the assistant
- - daemon, as well as writing the programFile.
+ - daemon, as well as writing the programFile, and putting a
+ - git-annex-shell wrapper into ~/.ssh
  -
  - Note that this is done every time it's started, so if the user moves
  - it around, the paths this sets up won't break.
  -}
 ensureInstalled :: IO ()
 ensureInstalled = do
-	e <- getEnv "OSX_GIT_ANNEX_APP_PROGRAM"
+	e <- getEnv "GIT_ANNEX_OSX_APP_BASE"
 	case e of
 		Nothing -> return ()
-		Just program -> do
+		Just base -> do
+			let program = base ++ "/bin/git-annex"
 			programfile <- programFile
 			createDirectoryIfMissing True (parentDir programfile)
 			writeFile programfile program
@@ -34,12 +38,19 @@ ensureInstalled = do
 			autostartfile <- userAutoStart autoStartLabel
 			installAutoStart program autostartfile
 
-{- Installs an autostart plist file for OSX. -}
-installAutoStart :: FilePath -> FilePath -> IO ()
-installAutoStart command file = do
-	createDirectoryIfMissing True (parentDir file)
-	writeFile file $ genOSXAutoStartFile autoStartLabel command
-		["assistant", "--autostart"]
-
-autoStartLabel :: String
-autoStartLabel = "com.branchable.git-annex.assistant"
+			{- This shim is only updated if it doesn't
+			 - already exist with the right content. This
+			 - ensures that there's no race where it would have
+			 - worked, but is unavailable due to being updated. -}
+			sshdir <- sshDir
+			let shim = sshdir </> "git-annex-shell"
+			let content = unlines
+				[ "#!/bin/sh"
+				, "set -e"
+				, "exec", base </> "runshell" ++ " git-annex-shell \"$@\""
+				]
+			curr <- catchDefaultIO "" $ readFile shim
+			when (curr /= content) $ do
+				createDirectoryIfMissing True (parentDir shim)
+				writeFile shim content
+				modifyFileMode shim $ addModes [ownerExecuteMode]

Assistant/Install/AutoStart.hs

@@ -0,0 +1,23 @@
+{- Assistant OSX autostart file installation
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Assistant.Install.AutoStart where
+
+import Utility.OSX
+import Utility.Path
+
+import System.Directory
+
+{- Installs an autostart plist file for OSX. -}
+installAutoStart :: FilePath -> FilePath -> IO ()
+installAutoStart command file = do
+	createDirectoryIfMissing True (parentDir file)
+	writeFile file $ genOSXAutoStartFile autoStartLabel command
+		["assistant", "--autostart"]
+
+autoStartLabel :: String
+autoStartLabel = "com.branchable.git-annex.assistant"

Build/InstallDesktopFile.hs

@@ -16,7 +16,7 @@ import Utility.Path
 import Utility.Monad
 import Locations.UserConfig
 import Utility.OSX
-import Assistant.OSX
+import Assistant.Install.AutoStart
 
 import Control.Applicative
 import System.Directory
@@ -97,16 +97,19 @@ installOSXAppFile appdir appfile mcontent = do
 	setFileMode dest mode
 
 install :: FilePath -> IO ()
-install = do
+install command = do
 #ifdef darwin_HOST_OS
-	writeOSXDesktop
+	writeOSXDesktop command
 #else
-	writeFDODesktop
+	writeFDODesktop command
 #endif
-	unlessM isRoot $ do
-		programfile <- inDestDir =<< programFile
-		createDirectoryIfMissing True (parentDir programfile)
-		writeFile programfile command
+	ifM isRoot
+		( return ()
+		, do
+			programfile <- inDestDir =<< programFile
+			createDirectoryIfMissing True (parentDir programfile)
+			writeFile programfile command
+		)
 
 main :: IO ()
 main = getArgs >>= go

ui-macos/git-annex.app/Contents/MacOS/git-annex-webapp

@@ -12,8 +12,8 @@ fi
 # If this is a standalone app, set a variable that git-annex can use to
 # install itself.
 if [ -e "$base/bin/git-annex" ]; then
-	GIT_ANNEX_OSX_WEBAPP_PROGRAM="$base/bin/git-annex"
-	export OSX_GIT_ANNEX_APP_PROGRAM
+	GIT_ANNEX_OSX_APP_BASE="$base"
+	export GIT_ANNEX_OSX_APP_BASE
 fi
 
 "$base/runshell" git-annex webapp "$@"

ui-macos/git-annex.app/Contents/MacOS/runshell

@@ -47,7 +47,7 @@ export GIT_EXEC_PATH
 if [ "$1" ]; then
 	cmd="$1"
 	shift 1
-	"$cmd" "$@"
+	exec "$cmd" "$@"
 else
 	$SHELL
 fi