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) 2009, Thomas Leonard
  12 # See the README file for details, or visit http://0install.net.
  13
  14 from logging import info
  15
  16 from zeroinstall.injector import model, policy, run
  17 from zeroinstall.injector.handler import Handler
  18
  19 class AutoPolicy(policy.Policy):
  20         __slots__ = ['download_only']
  21
  22         def __init__(self, interface_uri, download_only = False, dry_run = False, src = False, handler = None):
  23                 """@param handler: (new in 0.30) handler to use, or None to create a L{Handler}"""
  24                 handler = handler or Handler()
  25                 if dry_run:
  26                         info("Note: dry_run is deprecated. Pass it to the handler instead!")
  27                         handler.dry_run = True
  28                 policy.Policy.__init__(self, interface_uri, handler, src = src)
  29                 self.download_only = download_only
  30
  31         def execute(self, prog_args, main = None, wrapper = None):
  32                 downloaded = self.download_uncached_implementations()
  33                 if downloaded:
  34                         self.handler.wait_for_blocker(downloaded)
  35                 if not self.download_only:
  36                         run.execute(self, prog_args, dry_run = self.handler.dry_run, main = main, wrapper = wrapper)
  37                 else:
  38                         info("Downloads done (download-only mode)")
  39
  40         def download_and_execute(self, prog_args, refresh = False, main = None):
  41                 refreshed = self.solve_with_downloads(refresh)
  42
  43                 self.handler.wait_for_blocker(refreshed)
  44
  45                 if not self.solver.ready:
  46                         raise model.SafeException("Can't find all required implementations:\n" +
  47                                 '\n'.join(["- %s -> %s" % (iface, self.solver.selections[iface])
  48                                            for iface  in self.solver.selections]))
  49                 self.execute(prog_args, main = main)