From 4125916b67126a0cf17fe5b382a1f37cceec2760 Mon Sep 17 00:00:00 2001 From: Joey Hess Date: Sun, 13 Sep 2015 13:39:18 -0400 Subject: merge from git-annex --- src/Utility/Exception.hs | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'src/Utility/Exception.hs') diff --git a/src/Utility/Exception.hs b/src/Utility/Exception.hs index a1f96615..13000e03 100644 --- a/src/Utility/Exception.hs +++ b/src/Utility/Exception.hs @@ -1,6 +1,6 @@ {- Simple IO exception handling (and some more) - - - Copyright 2011-2014 Joey Hess + - Copyright 2011-2015 Joey Hess - - License: BSD-2-clause -} @@ -20,6 +20,7 @@ module Utility.Exception ( catchNonAsync, tryNonAsync, tryWhenExists, + catchHardwareFault, ) where import Control.Monad.Catch as X hiding (Handler) @@ -27,7 +28,9 @@ import qualified Control.Monad.Catch as M import Control.Exception (IOException, AsyncException) import Control.Monad import Control.Monad.IO.Class (liftIO, MonadIO) -import System.IO.Error (isDoesNotExistError) +import System.IO.Error (isDoesNotExistError, ioeGetErrorType) +import GHC.IO.Exception (IOErrorType(..)) + import Utility.Data {- Catches IO errors and returns a Bool -} @@ -84,3 +87,12 @@ tryWhenExists :: MonadCatch m => m a -> m (Maybe a) tryWhenExists a = do v <- tryJust (guard . isDoesNotExistError) a return (eitherToMaybe v) + +{- Catches only exceptions caused by hardware faults. + - Ie, disk IO error. -} +catchHardwareFault :: MonadCatch m => m a -> (IOException -> m a) -> m a +catchHardwareFault a onhardwareerr = catchIO a onlyhw + where + onlyhw e + | ioeGetErrorType e == HardwareFault = onhardwareerr e + | otherwise = throwM e -- cgit v1.2.3