#!/bin/dash
# 0p_l_etc_resolv_conf.dash - update /etc/resolv.conf if changed

r=resolv
cr=/usr/local/bin/cyg-$r.awk
run=/var/run/${r}conf
rrc=$run/$r.conf
SYSCONFDIR=${SYSCONFDIR:-/etc}
conf=$SYSCONFDIR/$r.conf

/bin/mkdir -pv		-- $run/		&& \
ip=$(/usr/bin/which	-- ipconfig)		&& \
tmp=$(/bin/mktemp -t	-- .XXXXXXXX.)		&& \
$ip /all | $cr	 > $tmp				&& \
[ -s $tmp ]					&& \
[ -w $rrc ]	|| : > $rrc
if ! /usr/bin/cmp -s	-- $tmp $rrc; then
    /bin/cp -fv		-- $tmp $rrc
    /bin/ln -frsTv	-- $rrc $conf
fi

/bin/rm -f		-- $tmp