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bring back default SIGINT handler

This seems to fix a problem I've recently seen where ctrl-c during rsync
leads to `git annex get` moving on to the next thing rather than exiting.

Seems likely that started happening with the switch to System.Process
(d1da9cf), as the old code took care
to install a default SIGINT handler.

Note that since the bug was only occurring sometimes, I am not 100% sure
I've squashed it, although I seem to have.
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commit 613e747d91ca1539d4ababee40333a23d32bdf14 1 parent 9770582
@joeyh authored
5 CmdLine.hs
@@ -15,6 +15,7 @@ import qualified Control.Exception as E
import qualified Data.Map as M
import Control.Exception (throw)
import System.Console.GetOpt
+import System.Posix.Signals
import Common.Annex
import qualified Annex
@@ -108,7 +109,9 @@ tryRun' errnum state cmd (a:as) = do
{- Actions to perform each time ran. -}
startup :: Annex Bool
-startup = return True
+startup = liftIO $ do
+ void $ installHandler sigINT Default Nothing
+ return True
{- Cleanup actions. -}
shutdown :: Bool -> Annex Bool
2  Utility/Rsync.hs
@@ -53,7 +53,7 @@ rsync = boolSystem "rsync"
- The params must enable rsync's --progress mode for this to work.
rsyncProgress :: (Integer -> IO ()) -> [CommandParam] -> IO Bool
-rsyncProgress callback params = catchBoolIO $
+rsyncProgress callback params =
withHandle StdoutHandle createProcessSuccess p (feedprogress 0 [])
p = proc "rsync" (toCommand params)
2  Utility/SafeCommand.hs
@@ -49,8 +49,6 @@ boolSystemEnv command params environ = dispatch <$> safeSystemEnv command params
safeSystem :: FilePath -> [CommandParam] -> IO ExitCode
safeSystem command params = safeSystemEnv command params Nothing
-{- Unlike many implementations of system, SIGINT(ctrl-c) is allowed
- - to propigate and will terminate the program. -}
safeSystemEnv :: FilePath -> [CommandParam] -> Maybe [(String, String)] -> IO ExitCode
safeSystemEnv command params environ = do
(_, _, _, pid) <- createProcess (proc command $ toCommand params)
2  doc/bugs/signal_weirdness.mdwn
@@ -14,7 +14,7 @@ For example:
Here git-annex exits before rsync has fully exited. Not a large problem
but sorta weird.
-The culprit is `safeSystemEnv` in Utility.SafeCommand, which installs
+The culprit is `CmdLine.startup` in Utility.SafeCommand, which installs
a default signal handler for SIGINT, which causes it to immediatly
terminate git-annex. rsync, in turn, has its own SIGINT handler, which
prints the message, typically later.
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