1 files changed, 10 insertions, 7 deletions
diff --git a/Backend/SHA.hs b/Backend/SHA.hs
index cf61139e0..a1dd1cf64 100644
--- a/Backend/SHA.hs
+++ b/Backend/SHA.hs
@@ -12,6 +12,7 @@ import qualified Annex
 import Types.Backend
 import Types.Key
 import Types.KeySource
+import System.Process
 
 import qualified Build.SysConfig as SysConfig
 import Data.Digest.Pure.SHA
@@ -53,14 +54,16 @@ shaN shasize file filesize = do
 	showAction "checksum"
 	case shaCommand shasize filesize of
 		Left sha -> liftIO $ sha <$> L.readFile file
-		Right command -> liftIO $ runcommand command
+		Right command -> liftIO $ parse command . lines <$>
+			readProcess command (toCommand [File file]) ""
 	where
-		runcommand command =
-			pOpen ReadFromPipe command (toCommand [File file]) $ \h -> do
-				sha <- fst . separate (== ' ') <$> hGetLine h
-				if null sha
-					then error $ command ++ " parse error"
-					else return sha
+		parse command [] = bad command
+		parse command (l:_)
+			| null sha = bad command
+			| otherwise = sha
+			where
+				sha = fst $ separate (== ' ') l
+		bad command = error $ command ++ " parse error"
 
 shaCommand :: SHASize -> Integer -> Either (L.ByteString -> String) String
 shaCommand shasize filesize