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#!/usr/bin/python3
# -*- coding: utf-8 -*-
#
# Software Updates Push Notifications helper.
#
# This helper is called with one of three things:
# a) regular push messages about updated click packages¹
# b) broadcast messages about system updates
# c) notifications you send yourself over dbus to actually notify the user that
# an update is ready to install².
#
# Figuring out which of those is the case is also this helper's job.
#
# notes:
# 1. nobody is sending those at the time of writing.
# 2. yes, this is rather convoluted. Most push helpers don't have to deal with
# this stuff.
import os
import json
import sys
import time
import gettext
import logging
import logging.handlers
from xdg.BaseDirectory import save_cache_path
_ = gettext.translation('ubuntu-system-settings', fallback=True).gettext
SYS_UPDATE = "system-image-update"
class SystemImage:
def __init__(self):
self.loop = None
self.sysimg = None
self.postal = None
self.notify = False
def setup(self):
import dbus
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GLib
gloop = DBusGMainLoop()
sys_bus = dbus.SystemBus(mainloop=gloop)
ses_bus = dbus.SessionBus(mainloop=gloop)
self.loop = GLib.MainLoop()
self.sysimg = dbus.Interface(
sys_bus.get_object("com.canonical.SystemImage", "/Service"),
dbus_interface="com.canonical.SystemImage")
self.postal = dbus.Interface(
ses_bus.get_object("com.ubuntu.Postal", "/com/ubuntu/Postal/_"),
dbus_interface="com.ubuntu.Postal")
self.notify = False
def quit(self):
if self.notify:
logging.debug("Notifying.")
# remove any older notifications about this
self.postal.ClearPersistent("_ubuntu-system-settings", SYS_UPDATE)
# send ours. This will of course come back to this same script.
self.postal.Post("_ubuntu-system-settings", json.dumps(SYS_UPDATE))
self.loop.quit()
def available_cb(self, available, downloading, *ignored):
logging.debug("Available: %s; downloading: %s", available, downloading)
if available:
if downloading:
# handled in the UpdateDownloaded or UpdateFailed handlers
return
# available and not downloading: auto downloads are turned
# off; notify the user right now.
self.notify = True
else:
# if not available, we were called spuriously. No notification.
self.notify = False
self.quit()
def downloaded_cb(self):
logging.debug("Downloaded.")
self.notify = True
self.quit()
def failed_cb(self, *ignored):
# give up
logging.debug("Failed.")
self.notify = False
self.quit()
def run(self):
logging.debug("Checking for update.")
self.sysimg.connect_to_signal("UpdateAvailableStatus",
self.available_cb)
self.sysimg.connect_to_signal("UpdateDownloaded", self.downloaded_cb)
self.sysimg.connect_to_signal("UpdateFailed", self.failed_cb)
self.sysimg.CheckForUpdate()
self.loop.run()
def main():
if len(sys.argv) != 3:
print("File in and out expected via argv", file=sys.stderr)
sys.exit(1)
f1, f2 = sys.argv[1:3]
# here you should look at the input (the contents of the file whose
# name is in f1, which are guaranteed to be json). If it's a broadcast
# it will be the most recent we've received, and will have passed a
# minimum amount of sanity checking, but you can probably do more. As
# per the design on https://wiki.ubuntu.com/SoftwareUpdates#Prompting
# if things are set to auto-download you should go download them (in a
# child process -- this helper process itself has 4 more seconds to
# live).
#
# the broadcast payload will be a single json object looking like
# { image-channel/device-model": [build-number, channel-alias]}
#
# e.g.,
#
# {"ubuntu-touch/utopic-proposed/hammerhead":[265,""]}
#
#
# When the click server starts sending notifications of packages a user
# can update, you should probably describe that payload here. What to
# do with it is described in some detail in the wiki page above.
#
#
# Once you've downloaded things and need to actually notify the user,
# you'd send a notification as below, over dbus to Post. That's the
# third payload this script will be called with; for that case you'd
# just pass the payload through.
#
# For cases when you don't want to notify the user (yet), the correct
# output (to be written to a file whose name is f2) is “{}”, i.e. an
# empty json object.
with open(f1) as f:
arg = json.load(f)
obj = {}
if arg == "system-image-update":
logging.debug("system-image-update; requesting regular notification.")
icon = "/usr/share/ubuntu/settings/system/icons/" + \
"settings-system-update.svg"
obj = {
"notification": {
"tag": SYS_UPDATE,
"emblem-counter": {
"count": 1,
"visible": True,
},
"vibrate": {
"pattern": [50, 150],
"repeat": 3,
},
"card": {
"summary": _("There's an updated system image."),
"body": _("Tap to open the system updater."),
"actions": ["settings:///system/system-update"],
"icon": icon,
"timestamp": int(time.time()),
"persist": True,
},
},
}
elif arg == "testing":
# for tests
logging.debug("Testing.")
obj = {"testing": True}
else:
# assume it's a broadcast
logging.debug("Broadcast; forking.")
if os.fork() == 0:
os.setsid()
os.closerange(0, 3)
logging.debug("Forked.")
s = SystemImage()
s.setup()
s.run()
return
json.dump(obj, open(f2, "w"))
if __name__ == '__main__':
logdir = save_cache_path("ubuntu-system-settings")
logfile = os.path.join(logdir, "software_updates_helper.log")
rothandler = logging.handlers.TimedRotatingFileHandler(logfile, when="D",
backupCount=10)
logging.basicConfig(
format="%(asctime)s %(levelname)8s [%(process)04x] %(message)s",
datefmt="%Y-%m-%dT%H:%M:%S",
level=logging.DEBUG,
handlers=(rothandler,))
logging.debug("Starting.")
try:
main()
except Exception:
logging.exception("Died with exception:")
else:
logging.debug("Done.")
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