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#!/bin/bash
# Get the time from gpspipe, and if present, set the time.
# 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=$'\n'
if ! /usr/sbin/gpsd_fixed </dev/null ; then
LG -s -p user.warn "GPS does not have a fix yet. Try again later."
exit 1
fi
# Terminate gpspipe after 10 seconds if it is our child
# gpspipe has issues with terminals and stalling on terminal
# read of the console.
(
sleep 10
ppid=$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 $ppid | LG -p user.error
fi
# pgrep does not work during boot.
pgrpmemb=$(ps --no-heading -o pgid,pid,comm -e | grep '^ *'"${pgid}"' *' | sed -r 's/^ *[0-9]+ *//')
gpspipepid=$(echo "${pgrpmemb}" | egrep '[[:space:]]gpspipe$' | sed 's/[[:space:]].*//')
((DEBUG)) && LG -p user.info "$pgid is pgid $gpspipepid is gpspipepid"
# Find the gpspipepid that is our grandchild
((didkill=0))
# for loop is in case gpspipepid has children.
for p in ${gpspipepid} ; do
if ((${#p})) ; then
kill_it gpspipe $p TERM
((didkill=p))
break
fi
done
if ((didkill == 0)) ; then
exit 0
fi
# Do a sigkill to be sure.
sleep 2
kill_it gpspipe $didkill KILL
) &
# Get the ISO8601 time from GPSD
ISO8601=$(gpspipe -w | egrep -m1 '\{"class":"TPV","device":"/dev/gps0"(,"status":[0-9])*,"mode":3,"time":"' | sed -e 's/.*,"time":"//' -e 's/Z",.*//')
if (( ${#ISO8601} > 18 )) ; then
LG -p user.warn "Updating time to time, ${ISO8601}."
[[ $ISO8601 =~ ([^-]*)-([^-]*)-([^T]*)T([^:]*):([^:]*):([^\.]*)\. ]]
Y=${BASH_REMATCH[1]}
M=${BASH_REMATCH[2]}
D=${BASH_REMATCH[3]}
h=${BASH_REMATCH[4]}
m=${BASH_REMATCH[5]}
s=${BASH_REMATCH[6]}
fi
if ((${#Y} == 4 )) && ((${#M} > 0)) && ((${#D} > 0)) && ((${#h} > 0)) && ((${#m} > 0)) && ((${#s} > 0)) ; then
if [[ $(readlink -f /bin/date) =~ busybox ]] ; then
date -u "${Y}.${M}.${D}-${h}:${m}:${s}" >/dev/null
else
date -u "${M}${D}${h}${m}${Y}.${s}" >/dev/null
fi
else
LG -p user.err "gpspipe output is bad or missing"
exit 1
fi
exit 0
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