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I want to execute a script when network (any interface) goes up and when
goes down (with parameters).

I've found easy to trigger first part with

    start on (net-device-up IFACE!=lo)

but didn't manage to found an easy way to trigger either net-device-
down, net-device-remove(d) , deconfiguring-networking

my job loks like this:

##################################################################
description     "network test"

start on (net-device-up IFACE!=lo)
# stop on ((net-device-down IFACE!=lo) or deconfiguring-networking)
stop on net-device-removed IFACE!=lo

pre-start exec /opt/test.sh start "$UPSTART_JOB - EVENT:
$UPSTART_EVENTS"

post-stop exec /opt/test.sh stop "$UPSTART_JOB - EVENT:
$UPSTART_STOP_EVENTS"

##################################################################

to test it I just go to nm-applet and deactivate one interface.

I've finally managed to make it work creating a simple script in
'/etc/network/if-post-down.d' to force emmiting the signal. something
like this:

########################################
#!/bin/sh

[ "$IFACE" != "lo" ] || exit 0

initctl emit -n net-device-removed IFACE=$IFACE

########################################

I'm not sure if this is expecte behaviour, if this is a feature request
or if it's a real bug, but for company pourposes I really need to emit a
signal when any interface (not lo) goes down.

please, ask for further info

EDITED: I can see here

https://lists.ubuntu.com/archives/upstart-devel/2011-January/001379.html

that '/etc/network/if-down.d/upstart' should emit net-device-down but in
my case that's not true. so maybe the bug should be:

event not emited by '/etc/network/if-down.d/upstart'

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
emit net-device-down signal when network-manager deconfigures interface
https://bugs.launchpad.net/bugs/998388
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