#!/usr/bin/env python

"""
pyupdatesd: A simple yum update checker.

This script will watch for available yum updates and show a Gtk2 tray icon and
notification pop-up when updates become available.

This is intended for desktop environments like XFCE that don't have a native
PackageKit update watcher.

Set this script to run on session startup, and it will check for updates every
15 minutes (by default; this is configurable in the source code).

This software is open domain and may be freely modified and distributed.

Requires: pygtk2

Usage: pyupdatesd [--display :0.0 --help --debug --testing]

--Kirsle
http://sh.kirsle.net
"""

################################################################################
# Configuration Section Begins Here                                            #
################################################################################

c = dict(
    # The title to be shown on the pop-up and the icon tooltip.
    title = "Updates Available",

    # The message to be shown in the pop-up.
    message = "There are updates available to install.",

    # Icon to use in the system tray and pop-up.
    icon = "/usr/share/icons/gnome/32x32/status/software-update-available.png",

    # Frequency to check for available updates.
    interval = 900, # 15 minutes

    # Command to run to check for available updates, and the expected status
    # code that indicates updates are available.
    yumcheck = "/usr/bin/yum check-update",

    # Path to notify-send (set to None if you don't want notifications)
    notify = "/usr/bin/notify-send",

    # Command to run for your graphical updater (i.e. yumex, gpk-update-viewer)
    yumgui = "/usr/bin/yumex --update-only",
)

################################################################################
# Configuration Section Ends Here                                              #
################################################################################

import gtk
import gobject

import getopt
import sys
import os
import commands
import subprocess
from time import time

# Command-line options.
try:
    options, remainder = getopt.getopt(sys.argv[1:], 'hdt', [
        'debug',
        'help',
        'testing',
        'display='
    ])
except:
    print "Unrecognized options given, try " + sys.argv[0] + " --help"
    exit(1)

debug   = False
testing = False
def say(*message):
    if debug:
        print ' '.join(map(lambda x: str(x), message))

def usage():
    print "Usage: " + sys.argv[0] + " [--display :0.0 --help --debug --testing]"
    print "Use --testing to force the script to show the notification icon."
    exit(1)

# Parse the options
for opt in options:
    if opt[0] == '--debug':
        debug = True
        say("Debug mode activated")
    elif opt[0] == '--display' or opt[0] == '-d':
        os.environ["DISPLAY"] = opt[1]
        say("Set environment $DISPLAY to", opt[1])
    elif opt[0] == '--testing' or opt[0] == '-t':
        testing = True
        debug   = True
        say("Testing the notification applet")
    elif opt[0] == '--help' or opt[0] == '-h':
        usage()

def do_updates():
    """Show your graphical update manager."""
    subprocess.call(c['yumgui'], shell=True)

def onClick(widget):
    """Event handler for the tray icon being clicked."""
    widget.set_visible(False)
    gobject.timeout_add(1, do_updates)

def show_notify():
    subprocess.call([c['notify'],
        '-a', __name__,
        '-i', c['icon'],
        c['message'],
    ])

tray = gtk.StatusIcon()
tray.set_from_file(c['icon'])
tray.set_title(c['title'])
tray.set_tooltip(c['title'])
tray.set_visible(False)
tray.connect('activate', onClick)

next_check = int(time()) # First check is immediately on startup
say("First check:", next_check)
def main_loop():
    # Time to check?
    global next_check
    if int(time()) >= next_check:
        status, output = commands.getstatusoutput(c['yumcheck'])

        status = status >> 8

        say("Executed command:", c['yumcheck'])

        say("Result status:", status)
        say("Command output:")
        say(output)

        if testing:
            say("Test mode: force the result to show available updates")
            status = 100

        # Updates?
        if status == 100:
            say("Result status indicates updates are available!")
            if tray.get_visible() == False:
                say("Show the notification pop-up")

                # Only show notification the first time.
                show_notify()
            tray.set_visible(True)
        elif tray.get_visible() == True and status == 0:
            # Updates have disappeared behind our back!
            tray.set_visible(False)

        next_check = int(time()) + c['interval']

    gobject.timeout_add(1000, main_loop)

gobject.timeout_add(1000, main_loop)

gtk.main()

# vim:expandtab