Merge pull request #1219 from bermanjosh/yesod-keter-no-stack

error handling when checking for stack binary

yesod-bin/Keter.hs

@@ -79,8 +79,8 @@ keter cabal noBuild noCopyTo buildArgs = do
 
     unless noBuild $ do
         stackQueryRunSuccess <- do
-            (ec,_,_) <- readProcessWithExitCode "stack" ["query"] ""
-            return (ec == ExitSuccess)
+            eres <- try $ readProcessWithExitCode "stack" ["query"] "" :: IO (Either IOException (ExitCode, String, String))
+            return $ either (\_ -> False) (\(ec, _, _) -> (ec == ExitSuccess)) eres
 
         let inStackExec = isJust $ lookup "STACK_EXE" env'
             mStackYaml = lookup "STACK_YAML" env'

yesod-bin/yesod-bin.cabal

@@ -1,5 +1,5 @@
 name:            yesod-bin
-version:         1.4.18
+version:         1.4.18.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>