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#!/bin/bash
# PPS= 1484247472.29561104 clock= 1484247990.00000000 offset= 517.704388959
# DEBUG=1 to set debug
NAME=gpsd_ubx_settime
shopt -s expand_aliases
alias LG="logger -t $NAME"
function kill_it
{
cmd=$1
pid=$2
sig=$3
((DEBUG)) && LG -p user.info "terminating $cmd(${pid}) with SIG${sig}"
kill -SIG${sig} ${pid}
result=$?
((DEBUG)) && LG -p user.info "kill -SIG${sig} ${pid} result is $result"
}
trap "stty echo icanon" exit
OIFS=$IFS
IFS=$'\n'
if ! /usr/sbin/gpsd_ubx_fixed </dev/null ; then
LG -s -p user.warn "GPS does not have a fix yet. Try again later."
exit 1
fi
# Terminate gpsmon after 10 seconds if it is our child
# gpsmon has issues with terminals and stalling on terminal
# read of the console.
(
sleep 10
ppid=$BASHPID
pgid=$(ps --no-heading -o pgid -p $ppid)
if ((${#pgid} == 0)) ; then
LG -p user.err "Could not find a pgid for $ppid"
ps -fjp $ppid | LG -p user.error
fi
gpsmonpid=$(pgrep -lg $pgid | egrep '[[:space:]]gpsmon$' | sed 's/[[:space:]].*//')
((DEBUG)) && LG -p user.info "$pgid is pgid $gpsmonpid is gpsmonpid"
# Find the gpsmonpid that is our grandchild
((didkill=0))
# for loop is in case gpsmonpid has children.
for p in ${gpsmonpid} ; do
if ((${#p})) ; then
kill_it gpsmon $p TERM
((didkill=p))
break
fi
done
if ((didkill == 0)) ; then
exit 0
fi
# Do a sigkill to be sure.
sleep 2
kill_it gpsmon $didkill KILL
) &
epoch=$(gpsmon -a 2>&1 | ( while read ln ; do
if [[ $ln =~ ^[[:space:]]*PPS=.*clock=[[:space:]]*([0-9]*)\. ]] ; then
echo ${BASH_REMATCH[1]}
break
fi
done ))
if [[ $epoch =~ ^[0-9]+$ ]] ; then
LG -p user.warn "Updating time to epoch time, ${epoch}."
date +%s -s @${epoch} >/dev/null
else
LG -p user.err "gpsmon output is bad."
exit 1
fi
exit 0
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