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Viewing changes to landscape/manager/packagemanager.py

  • Committer: Bazaar Package Importer
  • Author(s): Rick Clark
  • Date: 2008-09-08 16:35:57 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20080908163557-l3ixzj5dxz37wnw2
Tags: 1.0.18-0ubuntu1
New upstream release 

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landscape/manager/packagemanager.py
 
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import logging
 
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import os
 
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from twisted.internet.utils import getProcessOutput
 
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from twisted.internet.defer import succeed
 
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from landscape.package.store import PackageStore
 
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from landscape.package.changer import find_changer_command
 
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from landscape.manager.manager import ManagerPlugin
 
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class PackageManager(ManagerPlugin):
 
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    run_interval = 1800
 
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    def __init__(self, package_store_filename=None):
 
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        super(PackageManager, self).__init__()
 
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        if package_store_filename:
 
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            self._package_store = PackageStore(package_store_filename)
 
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        else:
 
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            self._package_store = None
 
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        self._changer_command = find_changer_command()
 
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    def register(self, registry):
 
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        super(PackageManager, self).register(registry)
 
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        self.config = registry.config
 
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        if not self._package_store:
 
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            filename = os.path.join(registry.config.data_path,
 
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                                    "package/database")
 
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            self._package_store = PackageStore(filename)
 
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        registry.register_message("change-packages",
 
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                                  self._enqueue_message_as_changer_task)
 
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        self.run()
 
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    def _enqueue_message_as_changer_task(self, message):
 
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        self._package_store.add_task("changer", message)
 
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        self.spawn_changer()
 
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    def run(self):
 
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        result = self.registry.broker.get_accepted_message_types()
 
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        result.addCallback(self._got_message_types)
 
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        return result
 
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    def _got_message_types(self, message_types):
 
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        if "change-packages-result" in message_types:
 
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            self.spawn_changer()
 
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    def spawn_changer(self):
 
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        args = ["--quiet"]
 
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        if self.config.config:
 
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            args.extend(["-c", self.config.config])
 
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        if self._package_store.get_next_task("changer"):
 
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            # path is set to None so that getProcessOutput does not
 
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            # chdir to "." see bug #211373
 
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            result = getProcessOutput(self._changer_command,
 
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                                      args=args, env=os.environ,
 
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                                      errortoo=1,
 
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                                      path=None)
 
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            result.addCallback(self._got_changer_output)
 
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        else:
 
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            result = succeed(None)
 
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        return result
 
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    def _got_changer_output(self, output):
 
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        if output:
 
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            logging.warning("Package changer output:\n%s" % output)