Date: Thu, 15 Apr 2010 10:00:33 +0100 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: smyru@heron.pl Cc: freebsd-rc@FreeBSD.org Subject: Re: conf/145530: [rc.d] ntpdate(8): ntpdate rc needs wpa_supplicant to go online Message-ID: <4BC6D5B1.3000107@dial.pipex.com> In-Reply-To: <20100413202145.M96857@heron.pl> References: <201004092358.o39NwXVE012127@freefall.freebsd.org> <20100413202145.M96857@heron.pl>
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I don't think the attached script is quite what you want, but I use it
to solve a similar problem.
On my domestic network I have a gateway FreeBSD box that the entire
local network sits behind, and I have the machine I use as my desktop.
Both machines get switched off at least every night. Come switch on
time, I don't always remember to boot the gateway first, and often got
exactly this problem --- ntpdate failing because I had no external
network connection.
I was able to solve that by creating my own /usr/local/etc/rc.d script
which runs before ntpdate and waits some amount of time for my gateway
machine to come up. If I know I'm booting with no network I can just
interrupt it with ^C.
I'm sure that something similar would work for you. Whether such a
solution is appropriate more generally I don't know but something like
it should work for you, I think, without any mods being required to the
base system.
hth,
--Alex
$ egrep gateway_up /etc/rc.conf
gateway_up_enable="YES" # Wait for gateway to
come up
gateway_up_host="192.168.23.3"
In addition you can set e.g.
gateway_up_external="some.domain.name" # External host we can ping
gateway_up_wait=600 # wait 600s for gateway to come up
gateway_up_external_wait=600 # wait 600s for external host to be
available (e.g. waiting for named to start on gateway)
#!/bin/sh
#
# $Id: gateway_up,v 1.4 2009/05/25 11:23:52 alex Exp $
#
# PROVIDE: gateway_up
# REQUIRE: NETWORKING syslogd named
# BEFORE: ntpdate
# KEYWORD: nojail
. /etc/rc.subr
name="gateway_up"
rcvar=`set_rcvar`
start_cmd="gateway_up_start"
stop_cmd=":"
: ${gateway_up_wait:=180}
: ${gateway_up_external_wait:=180}
[ ${gateway_up_wait} -lt 0 ] && gateway_up_wait=$((-${gateway_up_wait}))
[ ${gateway_up_external_wait} -lt 0 ] &&
gateway_up_external_wait=$((-${gateway_up_external_wait}))
gateway_up_start()
{
local external_host count echo_done
if [ -z "$gateway_up_host" ]; then
warn "gateway_up_host not set"
return 1
fi
if [ -z "$gateway_up_external" ]; then
if [ -n "$ntpdate_hosts" ]; then
"$gateway_up_external"="$ntpdate_hosts"
elif [ -z "$ntpdate_hosts" -a -f ${ntpdate_config} ]; then
gateway_up_external=`awk '
/^server[ \t]*127.127/ {next}
/^(server|peer)/ {print $2}
' < ${ntpdate_config}`
else
warn "gateway_up_external unset and no ntp hosts found"
fi
fi
if ! ping -W 1 -c 1 $gateway_up_host > /dev/null 2>&1; then
# Wait for gateway host a maximum of ${gateway_up_wait} seconds
echo -n "Waiting (roughly) ${gateway_up_wait}s for gateway
${gateway_up_host}: "
if ! ping -o -t ${gateway_up_wait} $gateway_up_host > /dev/null
2>&1; then
echo "not up...continuing"
return 0
fi
echo "done"
fi
# Wait for an external host to ping for a rough maximum of
# ${gateway_up_external_wait} seconds, trying each in turn
# for 2 seconds
if [ -z "${gateway_up_external}" ]; then
echo "No gateway_up_external hosts to check"
return 0
fi
count=0
echo_done=0
while [ $count -lt ${gateway_up_external_wait} ]; do
for external_host in ${gateway_up_external}; do
count=$((count+1))
#echo checking $external_host
# SIGALRM somewhere (prints "Alarm clock") sometimes
# if we try -o -t 1
if ping -W 100 -c 1 $external_host > /dev/null 2>&1; then
if [ $echo_done -gt 0 ]; then
echo "done"
fi
return 0
fi
if [ $count -eq 1 ]; then
echo -n "Waiting (roughly) ${gateway_up_external_wait}s
for external connectivity: "
echo_done=1
fi
#echo "sleeping"
sleep 2
done
done
if [ $echo_done -gt 0 ]; then
echo "No connectivity...continuing"
fi
}
load_rc_config $name
run_rc_command "$1"
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