/etc/rdnssd/merge-hook is in rdnssd 1.0.1-1ubuntu2.
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 | #! /bin/sh
#
# resolv.conf merge hook for Debian rdnssd
# *************************************************************************
# * Copyright © 2008 Rémi Denis-Courmont. *
# * This program is free software: you can redistribute and/or modify *
# * it under the terms of the GNU General Public License as published by *
# * the Free Software Foundation, versions 2 or 3 of the license. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU General Public License for more details. *
# * *
# * You should have received a copy of the GNU General Public License *
# * along with this program. If not, see <http://www.gnu.org/licenses/>. *
# *************************************************************************
PATH=/sbin:/bin
INPUT="/var/run/rdnssd/resolv.conf"
if [ -x /sbin/resolvconf ]; then
/sbin/resolvconf -a 000.rdnssd < "$INPUT"
else
cat -- "$INPUT" > "/etc/resolv.conf"
fi
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