convert to withCreateProcess for async exception safety

This handles all createProcessSuccess callers, and aside from process
pools, the complete conversion of all process running to async exception
safety should be complete now.

Also, was able to remove from Utility.Process the old API that I now
know was not a good idea. And proof it was bad: The code size went *down*,
despite there being a fair bit of boilerplate for some future API to
reduce.

Git/Command.hs

@@ -43,9 +43,13 @@ run params repo = assertLocal repo $
 
 {- Runs git and forces it to be quiet, throwing an error if it fails. -}
 runQuiet :: [CommandParam] -> Repo -> IO ()
-runQuiet params repo = withQuietOutput createProcessSuccess $
-	(proc "git" $ toCommand $ gitCommandLine (params) repo)
-		{ env = gitEnv repo }
+runQuiet params repo = withNullHandle $ \nullh ->
+	let p = (proc "git" $ toCommand $ gitCommandLine (params) repo)
+		{ env = gitEnv repo
+		, std_out = UseHandle nullh
+		, std_err = UseHandle nullh
+		}
+	in withCreateProcess p $ \_ _ _ -> forceSuccessProcess p
 
 {- Runs a git command and returns its output, lazily.
  -
@@ -99,9 +103,16 @@ pipeWriteRead params writer repo = assertLocal repo $
 
 {- Runs a git command, feeding it input on a handle with an action. -}
 pipeWrite :: [CommandParam] -> Repo -> (Handle -> IO ()) -> IO ()
-pipeWrite params repo = assertLocal repo $ 
-	withHandle StdinHandle createProcessSuccess $
-		gitCreateProcess params repo
+pipeWrite params repo a = assertLocal repo $
+	let p = (gitCreateProcess params repo)
+		{ std_in = CreatePipe }
+	in withCreateProcess p (go p)
+  where
+	go p (Just hin) _ _ pid = 
+		forceSuccessProcess p pid
+			`after`
+		a hin
+	go _ _ _ _ _ = error "internal"
 
 {- Reads null terminated output of a git command (as enabled by the -z 
  - parameter), and splits it. -}