/etc/network/if-down.d/upstart is in ifupdown 0.8.19.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/sh -e
if [ -e /lib/lsb/init-functions ]; then
. /lib/lsb/init-functions
fi
if ! init_is_upstart; then
exit 0
fi
# Let's ignore meta entries (ifdown -a)
if [ "$ADDRFAM" = "meta" ]; then
exit 0
fi
initctl emit -n net-device-down \
"IFACE=$IFACE" \
"LOGICAL=$LOGICAL" \
"ADDRFAM=$ADDRFAM" \
"METHOD=$METHOD"
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