/etc/init/upstart-socket-bridge.conf is in upstart 1.11-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # upstart-socket-bridge - Bridge socket events into upstart
#
# This helper daemon receives socket(7) events and
# emits equivalent Upstart events.
description "Bridge socket events into upstart"
emits socket
start on net-device-up IFACE=lo
stop on runlevel [!2345]
expect daemon
respawn
exec upstart-socket-bridge --daemon
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