Comment 45 for bug 543506

I am _totally_ confused by the upstart "event".

I see startup on "filesystem" and "net-device-up IFACE=lo" in /etc/inti/rc-sysinit.conf
and think I understand that "filesystem" and "net-device-up" are "events",
but I have not been able to find _anything_ that would explain where they come from.

The /etc/init/mountall,conf file has a line that reads "emits filesystem" but I strongly doubt that
it's presence causes that event to be asserted just because the file has been read.
And " grep net-device /etc/init/* " only finds net-device-up as an event in the " start on " lines in
  /etc/init/mountall.conf
  /etc/init/protmap.conf
  /etc/init/rc-sysinit.conf

Where does net-device-up come from?
How does IFACE get set to "lo"?

Is there documentation I'm missing?