injector/run.py

   1 import os, sys
   2
   3 from policy import policy
   4 from model import *
   5
   6 def do_env_binding(binding, iface):
   7         impl = get_impl(iface)
   8         extra = os.path.join(impl.path, binding.insert)
   9         if binding.name in os.environ:
  10                 os.environ[binding.name] = extra + ':' + os.environ[binding.name]
  11         else:
  12                 os.environ[binding.name] = extra
  13         #print "%s=%s" % (binding.name, os.environ[binding.name])
  14
  15 def execute(iface, prog, prog_args):
  16         def setup_bindings(i):
  17                 impl = get_impl(i)
  18                 for dep in impl.dependencies.values():
  19                         dep_iface = dep.get_interface()
  20                         for b in dep.bindings:
  21                                 if isinstance(b, EnvironmentBinding):
  22                                         do_env_binding(b, dep_iface)
  23                         setup_bindings(dep_iface)
  24         setup_bindings(iface)
  25
  26         prog_path = os.path.join(policy.implementation[iface].path, prog)
  27         if not os.path.exists(prog_path):
  28                 print "'%s' does not exist." % prog_path
  29                 print "(implementation '%s' + program '%s')" % (policy.implementation[iface].path, prog)
  30                 sys.exit(1)
  31         os.execl(prog_path, prog_path, *prog_args)
  32
  33 def get_impl(interface):
  34         try:
  35                 return policy.implementation[interface]
  36         except KeyError:
  37                 if not interface.name:
  38                         raise SafeException("We don't have enough information to "
  39                                             "run this program yet. "
  40                                             "Need to download:\n%s" % interface.uri)
  41                 if interface.implementations:
  42                         offline = ""
  43                         if policy.network_use == network_offline:
  44                                 offline = "\nThis may be because 'Network Use' is set to Off-line."
  45                         raise SafeException("No usable implementation found for '%s'.%s" %
  46                                         (interface.name, offline))