/etc/network/if-pre-up.d/whereami is in whereami 0.3.34-0.4.
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 21 22 23 24 25 26 27 28 29 30 31 32 | #!/bin/sh
#
# $Id: whereami.network-hook,v 1.5 2006/11/12 00:39:14 andrew Exp $
#
# Hook for whereami to run when network is being brought up
# Andrew McMillan <awm@debian.org>
#
# Not a lot to do, AFAICS - just call whereami...
#
# Unless it is going to get really complicated we will use the same
# script in all situations, so we need the name we were called by.
# We only run in pre-up phase because that is where network detection
# generally needs to happen. Possibly we could run something post-up
# but whereami ain't architected that way.
#
# Quit if we're called for the loopback
[ "$IFACE" = lo ] && exit 0
# Just exit if whereami is no longer installed
test ! -e /usr/sbin/whereami && exit 1
EXTRA_HINT=""
SITUATION=`basename \`dirname $0\` .d`
if [ "$SITUATION" = "pre-up" ] ; then
EXTRA_HINT=',netstart'
fi
# Can't use --syslog because syslog starts after the network (bug #160187)
/usr/sbin/whereami --run_from ${SITUATION} --hint "${SITUATION},${IFACE}${EXTRA_HINT}"
exit 0
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