zeroinstall/injector/autopolicy.py

   1 """
   2 A simple non-interactive policy.
   3
   4 This module provides a simple policy that will select, download and run a suitable set of
   5 implementations. It is not interactive. This is the policy used when you run B{0launch -c}, and
   6 is also the policy used to run the injector's GUI.
   7
   8 @deprecated: The interesting functionality has moved into the L{policy.Policy} base-class.
   9 """
  10
  11 # Copyright (C) 2006, Thomas Leonard
  12 # See the README file for details, or visit http://0install.net.
  13
  14 import os
  15 from logging import debug, info, warn
  16
  17 from zeroinstall.support import tasks
  18 from zeroinstall.injector import model, policy, run
  19 from zeroinstall.injector.handler import Handler
  20 from zeroinstall import NeedDownload
  21
  22 class AutoPolicy(policy.Policy):
  23         __slots__ = ['download_only']
  24
  25         def __init__(self, interface_uri, download_only = False, dry_run = False, src = False, handler = None):
  26                 """@param handler: (new in 0.30) handler to use, or None to create a L{Handler}"""
  27                 handler = handler or Handler()
  28                 if dry_run:
  29                         info("Note: dry_run is deprecated. Pass it to the handler instead!")
  30                         handler.dry_run = True
  31                 policy.Policy.__init__(self, interface_uri, handler, src = src)
  32                 self.download_only = download_only
  33
  34         def execute(self, prog_args, main = None, wrapper = None):
  35                 downloaded = self.download_uncached_implementations()
  36                 if downloaded:
  37                         self.handler.wait_for_blocker(downloaded)
  38                 if not self.download_only:
  39                         run.execute(self, prog_args, dry_run = self.handler.dry_run, main = main, wrapper = wrapper)
  40                 else:
  41                         info("Downloads done (download-only mode)")
  42
  43         def download_and_execute(self, prog_args, refresh = False, main = None):
  44                 refreshed = self.solve_with_downloads(refresh)
  45
  46                 self.handler.wait_for_blocker(refreshed)
  47
  48                 if not self.solver.ready:
  49                         raise model.SafeException("Can't find all required implementations:\n" +
  50                                 '\n'.join(["- %s -> %s" % (iface, self.solver.selections[iface])
  51                                            for iface  in self.solver.selections]))
  52                 self.execute(prog_args, main = main)