GitLab

run the below program with something like: rm -r foo; ghc env.hs && ./env

import System.Process( runInteractiveProcess, waitForProcess, ProcessHandle )
import System.Directory

main = do
  createDirectory "foo"
  writeFile "foo/bar" "#!/bin/sh\necho baz"
  (inH,outH,errH,procH) <- runInteractiveProcess "chmod" ["+x", "./foo/bar"] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitSuccess
  (inH,outH,errH,procH) <- runInteractiveProcess "env" ["PATH=./foo", "bar"] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitSuccess
  (inH,outH,errH,procH) <- runInteractiveProcess "bar" [] Nothing $ Just [("PATH","./foo")]
  ex <- waitForProcess procH
  print ex -- ExitFailure 127 (indicates command not found)

Trac metadata

Trac field	Value
Version	7.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture