/etc/network/if-up.d/000resolvconf is in openresolv 3.8.0-1.
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 | #!/bin/sh
# ifup hook script for resolvconf
# Written by Roy Marples <roy@marples.name> under the BSD-2 license
[ -x /sbin/resolvconf ] || exit 0
case "$ADDRFAM" in
inet|inet6) : ;;
*) exit 0;;
esac
conf=
[ -n "$IF_DNS_DOMAIN" ] && conf="${conf}domain $IF_DNS_DOMAIN\n"
[ -n "$IF_DNS_SEARCH" ] && conf="${conf}search $IF_DNS_SEARCH\n"
[ -n "$IF_DNS_SORTLIST" ] && conf="${conf}sortlist $IF_DNS_SORTLIST\n"
[ -n "$IF_DNS_OPTIONS" ] && conf="${conf}options $IF_DNS_OPTIONS\n"
for nameserver in $IF_DNS_NAMESERVERS; do
conf="${conf}nameserver $nameserver\n"
done
if [ -n "$conf" ]; then
conf="# Generated by ifup for $IFACE.$ADDRFAM\n$conf"
printf "$conf" | /sbin/resolvconf -a "$IFACE.$ADDRFAM"
fi
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