run.py

   1 import os, sys
   2
   3 from model import Interface, SafeException, EnvironmentBinding
   4
   5 def do_env_binding(binding, path):
   6         extra = os.path.join(path, binding.insert)
   7         if binding.name in os.environ:
   8                 os.environ[binding.name] = extra + ':' + os.environ[binding.name]
   9         else:
  10                 os.environ[binding.name] = extra
  11         #print "%s=%s" % (binding.name, os.environ[binding.name])
  12
  13 def execute(policy, prog_args):
  14         iface = policy.get_interface(policy.root)
  15         if not iface.main:
  16                 raise SafeException("Interface '%s' cannot be executed directly; it is just a library "
  17                                     "to be used by other programs (or missing 'main' attribute on the "
  18                                     "root <interface> element)." % iface.name)
  19
  20         def setup_bindings(i):
  21                 impl = policy.get_implementation(i)
  22                 for dep in impl.dependencies.values():
  23                         dep_iface = policy.get_interface(dep.interface)
  24                         for b in dep.bindings:
  25                                 if isinstance(b, EnvironmentBinding):
  26                                         dep_impl = policy.get_implementation(dep_iface)
  27                                         do_env_binding(b, policy.get_implementation_path(dep_impl))
  28                         setup_bindings(dep_iface)
  29         setup_bindings(iface)
  30
  31         root_impl = policy.get_implementation(iface)
  32         prog_path = os.path.join(policy.get_implementation_path(root_impl), iface.main)
  33         if not os.path.exists(prog_path):
  34                 print >>sys.stderr, "'%s' does not exist." % prog_path
  35                 print >>sys.stderr, "(implementation '%s' + program '%s')" % (policy.implementation[iface].id, iface.main)
  36                 sys.exit(1)
  37         os.execl(prog_path, prog_path, *prog_args)