Python Policy.solve_and_download_impls方法代碼示例

# 需要導入模塊: from zeroinstall.injector.policy import Policy [as 別名]
# 或者: from zeroinstall.injector.policy.Policy import solve_and_download_impls [as 別名]
	def testAbsMain(self):
		tmp = tempfile.NamedTemporaryFile(prefix = 'test-')
		tmp.write(
"""<?xml version="1.0" ?>
<interface last-modified="1110752708"
 uri="%s"
 xmlns="http://zero-install.sourceforge.net/2004/injector/interface">
  <name>Foo</name>
  <summary>Foo</summary>
  <description>Foo</description>
  <group main='/bin/sh'>
   <implementation id='.' version='1'/>
  </group>
</interface>""" % foo_iface_uri)
		tmp.flush()
		policy = Policy(tmp.name, config = self.config)
		try:
			downloaded = policy.solve_and_download_impls()
			if downloaded:
				policy.handler.wait_for_blocker(downloaded)
			run.execute_selections(policy.solver.selections, [], stores = policy.config.stores)
			assert False
		except SafeException, ex:
			assert 'Command path must be relative' in str(ex), ex

# 需要導入模塊: from zeroinstall.injector.policy import Policy [as 別名]
# 或者: from zeroinstall.injector.policy.Policy import solve_and_download_impls [as 別名]
def get_selections(config, options, iface_uri, select_only, download_only, test_callback):
	"""Get selections for iface_uri, according to the options passed.
	Will switch to GUI mode if necessary.
	@param options: options from OptionParser
	@param iface_uri: canonical URI of the interface
	@param select_only: return immediately even if the selected versions aren't cached
	@param download_only: wait for stale feeds, and display GUI button as Download, not Run
	@return: the selected versions, or None if the user cancels
	@rtype: L{selections.Selections} | None
	"""
	if options.offline:
		config.network_use = model.network_offline

	# Try to load it as a feed. If it is a feed, it'll get cached. If not, it's a
	# selections document and we return immediately.
	maybe_selections = config.iface_cache.get_feed(iface_uri, selections_ok = True)
	if isinstance(maybe_selections, selections.Selections):
		if not select_only:
			blocker = maybe_selections.download_missing(config)
			if blocker:
				logging.info(_("Waiting for selected implementations to be downloaded..."))
				config.handler.wait_for_blocker(blocker)
		return maybe_selections

	r = requirements.Requirements(iface_uri)
	r.parse_options(options)

	policy = Policy(config = config, requirements = r)

	# Note that need_download() triggers a solve
	if options.refresh or options.gui:
		# We could run immediately, but the user asked us not to
		can_run_immediately = False
	else:
		if select_only:
			# --select-only: we only care that we've made a selection, not that we've cached the implementations
			policy.need_download()
			can_run_immediately = policy.ready
		else:
			can_run_immediately = not policy.need_download()

		stale_feeds = [feed for feed in policy.solver.feeds_used if
				not feed.startswith('distribution:') and	# Ignore (memory-only) PackageKit feeds
				policy.is_stale(config.iface_cache.get_feed(feed))]

		if download_only and stale_feeds:
			can_run_immediately = False

	if can_run_immediately:
		if stale_feeds:
			if policy.network_use == model.network_offline:
				logging.debug(_("No doing background update because we are in off-line mode."))
			else:
				# There are feeds we should update, but we can run without them.
				# Do the update in the background while the program is running.
				from zeroinstall.injector import background
				background.spawn_background_update(policy, options.verbose > 0)
		return policy.solver.selections

	# If the user didn't say whether to use the GUI, choose for them.
	if options.gui is None and os.environ.get('DISPLAY', None):
		options.gui = True
		# If we need to download anything, we might as well
		# refresh all the feeds first.
		options.refresh = True
		logging.info(_("Switching to GUI mode... (use --console to disable)"))

	if options.gui:
		gui_args = policy.requirements.get_as_options()
		if download_only:
			# Just changes the button's label
			gui_args.append('--download-only')
		if options.refresh:
			gui_args.append('--refresh')
		if options.verbose:
			gui_args.insert(0, '--verbose')
			if options.verbose > 1:
				gui_args.insert(0, '--verbose')
		if options.with_store:
			for x in options.with_store:
				gui_args += ['--with-store', x]
		if select_only:
			gui_args.append('--select-only')

		from zeroinstall import helpers
		sels = helpers.get_selections_gui(iface_uri, gui_args, test_callback)

		if not sels:
			return None		# Aborted
	else:
		# Note: --download-only also makes us stop and download stale feeds first.
		downloaded = policy.solve_and_download_impls(refresh = options.refresh or download_only or False,
							     select_only = select_only)
		if downloaded:
			config.handler.wait_for_blocker(downloaded)
		sels = selections.Selections(policy)

	return sels