[GHC] #9393: execvpe should handle ENOTDIR

[GHC]

#9393: execvpe should handle ENOTDIR
-------------------------------------+-------------------------------------
       Reporter:  iquiw              |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  libraries/unix     |                 Version:  7.8.2
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 If PATH environment variable contains non directory component,
 execvpe fails by ENOTDIR.

 For example, if "/tmp/foo" is a regular file, the following program fails
 with PATH contains "/tmp/foo".
 {{{
 module Main where

 import System.Environment
 import System.Posix.Process

 main :: IO ()
 main = do
     env <- getEnvironment
     executeFile "echo" True [] (Just env)
     return ()
 }}}

 {{{
 $ PATH=/tmp/foo:$PATH runghc a.hs
 a.hs: echo: executeFile: inappropriate type (Not a directory)
 }}}

 See for example, https://github.com/haskell/cabal/issues/1723

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9393>
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