Enhancement: Allow update notifications to be send even when no updates are needed

[kevin-j-smith]

For updatesCheck where:

        pups = self.refreshUpdates()
        gups = self.refreshGroupUpdates()

        # If neither have updates, we can just exit.
        if not (pups or gups):
            sys.exit(0)

Go ahead and emit message and release the lock even when no updates are available. Possible to give emitter flag to allow this to be configurable.

        pups = self.refreshUpdates()
        gups = self.refreshGroupUpdates()

        # If neither have updates, we can just exit.
        if not (pups or gups):
            self.emitMessages()
            self.releaseLocks()
            sys.exit(0)

class UpdateEmitter(object):
      def sendMessages(self):
        """Send the messages that have been stored.  This should be
        overridden by inheriting classes to emit the messages
        according to their individual methods.
        """

        if self.opts.emit_when_already_updated and not self.output:
          self.output.append("Yum Cron Update ran successfully and 0 packages needing updated")

        # Convert any byte strings to unicode objects now (so that we avoid
        # implicit conversions with the "ascii" codec later when join()-ing the
        # strings, leading to tracebacks).
        self.output = [x.decode('utf-8') if isinstance(x, str) else x
                       for x in self.output]

This will allow configurability and notification even when 0 packages need updating.

[lukash]

As I've said in #120 : yum has been superseded by https://github.com/rpm-software-management/dnf, so any effort in this direction should be done over there. The development of yum has stopped.