/etc/init/network-interface.conf is in ifupdown 0.8.19.
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 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | # network-interface - configure network device
#
# This service causes network devices to be brought up or down as a result
# of hardware being added or removed, including that which isn't ordinarily
# removable.
description "configure network device"
emits net-device-up
emits net-device-down
emits static-network-up
start on net-device-added
stop on net-device-removed INTERFACE=$INTERFACE
instance $INTERFACE
export INTERFACE
pre-start script
if [ "$INTERFACE" = lo ]; then
# bring this up even if /etc/network/interfaces is broken
ifconfig lo 127.0.0.1 up || true
initctl emit -n net-device-up \
IFACE=lo LOGICAL=lo ADDRFAM=inet METHOD=loopback || true
fi
mkdir -p /run/network
ifup --allow auto $INTERFACE
ifup --allow hotplug $INTERFACE
end script
post-stop script
ifdown --force --allow auto $INTERFACE
ifdown --force --allow hotplug $INTERFACE
end script
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