Memory monitor .

bin/kano-memory-monitor

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+# kano-memory-monitor
+#
+# Copyright (C) 2015-2016 Kano Computing Ltd.
+# License: http://www.gnu.org/licenses/gpl-2.0.txt GNU GPL v2
+#
+# DBus daemon which handles memory reservation and monitoring
+
+# The deamon uses a system bus under the bus name 'me.kano.memory'
+
+
+import sys
+import traceback
+import dbus.exceptions
+from dbus.mainloop.glib import DBusGMainLoop
+
+from gi.repository import GObject
+
+from kano.logging import logger
+
+from kano_monitor.service import MonitorService, BUS_NAME
+
+
+
+def main():
+    GObject.threads_init()
+    DBusGMainLoop(set_as_default=True)
+
+    try:
+        # reserving the bus name, other instances of $0 will fail
+        bus_name = dbus.service.BusName(BUS_NAME, bus=dbus.SystemBus(), do_not_queue=True)
+
+        # available services, add more here
+        service = MonitorService(bus_name)
+
+    except dbus.exceptions.NameExistsException as e:
+        logger.warn('Could not reserve the SystemBus name, most likely another instance'
+                    ' of kano-boards-daemon already exists. - [{}]'.format(e))
+        return 1
+
+    except Exception as e:
+        logger.error('Unexpected error when starting the services.\n{}'
+                     .format(traceback.format_exc()))
+        return 2
+
+    GObject.MainLoop().run()
+
+
+if __name__ == '__main__':
+    sys.exit(main())

config/dbus/me.kano.monitor.conf

@@ -0,0 +1,17 @@
+
+<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+
+<busconfig>
+
+    <policy context="default">
+
+        <!-- Allow kano-boards-daemon to reserve the bus name -->
+        <allow own="me.kano.monitor"/>
+
+        <!-- Allow clients to call methods on interfaces on this bus name -->
+        <allow send_destination="me.kano.monitor"/>
+
+    </policy>
+
+</busconfig>

config/sudoers.d/kano-desktop_conf

@@ -13,3 +13,6 @@ Cmnd_Alias KILL_DESKTOP_WIDGETS = /usr/bin/pkill kano-settings, \
 
 # allow user to switch to virtual console terminals
 %sudo   ALL=(root) NOPASSWD: /bin/chvt
+
+# kano-memory-monitor is run as root to allow pid tracking
+%sudo   ALL=(root) NOPASSWD: /usr/bin/kano-memory-monitor

debian/install

@@ -21,6 +21,8 @@ config/gtk-2.0 etc/skel/.config/
 config/dconf etc/skel/.config/
 config/console usr/share/kano-desktop/config
 
+config/dbus/me.kano.monitor.conf /etc/dbus-1/system.d/
+
 config/sudoers.d/* usr/share/kano-desktop/config/sudoers.d
 
 config/systemd/kano.conf /lib/systemd/system/user@.service.d
@@ -35,6 +37,7 @@ bin/open-me etc/skel/.Rabbithole
 bin/use-the-force usr/bin
 bin/make-adventures usr/bin
 bin/kano-keyboard-hotkeys usr/bin
+bin/kano-memory-monitor usr/bin
 
 scripts/* usr/share/kano-desktop/scripts
 
@@ -44,3 +47,5 @@ kano-mount-trigger/kano-mount-trigger /usr/bin/
 kano-mount-trigger/95-kano-mount-trigger.rules /lib/udev/rules.d/
 
 systemd/* /usr/lib/systemd/user/
+
+kano_monitor /usr/lib/python2.7/dist-packages/

kano_monitor/__init__.py

@@ -0,0 +1,5 @@
+# __init__.py
+#
+# Copyright (C) 2015-2016 Kano Computing Ltd.
+# License: http://www.gnu.org/licenses/gpl-2.0.txt GNU GPL v2
+#