from __future__ import absolute_import, division, print_function
import subprocess
import libtbx.load_env # implicit import
import sys, os

def run():
  if len(sys.argv) < 3:
    raise RuntimeError(
      "usage: libtbx.env_run MODULE_DIST path/to/command [arg ...]")
  try:
    cmd_root = os.environ[sys.argv[1]]
  except KeyError:
    raise RuntimeError('Environment variable "%s" not defined.' % sys.argv[1])
  args = []
  if sys.argv[2].lower().endswith(".py"):
    args.append(sys.executable)
  args.append(os.path.normpath(os.path.join(cmd_root, sys.argv[2])))
  args.extend(sys.argv[3:])
  if not os.path.isfile(args[0]):
    raise RuntimeError("No such file: %s" % args[0])
  if not os.access(args[0], os.X_OK):
    raise RuntimeError("Permission denied: %s" % args[0])
  sys.exit(subprocess.call(args))

if __name__ == "__main__":
  run()