python/rox/launch.py

   1 """Launch programs using 0launch"""
   2
   3 import os
   4 from rox import _
   5
   6 class InjectorNotInstalled(Exception):
   7         uri = None
   8         def __init__(self, uri):
   9                 self.uri = uri
  10                 Exception.__init__(self,
  11                         _("The program '%s' cannot be run, as the "
  12                           "0launch command is not available. "
  13                           "It can be downloaded from here:\n\n"
  14                           "http://0install.net/injector.html") % uri)
  15
  16 def launch(*args):
  17         """Runs a program using 0launch, and returns the PID.
  18         If 0launch isn't installed, it raises InjectorNotInstalled,
  19         telling the user how to get it."""
  20         binpath = os.environ.get('PATH', '').split(':')
  21         # Try to run with '0launch'
  22         for bindir in binpath:
  23                 path = os.path.join(bindir, '0launch')
  24                 if os.path.isfile(path):
  25                         break
  26         else:
  27                 for x in args:
  28                         if not x.startswith('-'):
  29                                 raise InjectorNotInstalled(x)
  30                 raise InjectorNotInstalled(repr(args))
  31
  32         pid = os.spawnvp(os.P_NOWAIT, '0launch', ('0launch',) + args)
  33         return pid