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|
#!/bin/bash
# This script filters the gpspipe -w
# (json) output from GPSD. The GPS fix
# is taken from the mode parameter of
# the GPSD TPV object in the json output.
# Values are:
#
# 0 Unseen
# 1 No fix
# 2 2D
# 3 3D
#
# Fix file creation for GPS.
# If GPS reaches expected
# fix level, file GSP_FIXFILE is created.
# This is to know when to set the system
# and hardware clock, and when
# it is safe to start ntp.
# DEBUG=1 to set debug
NAME=gpsd_ubx_fixed
shopt -s expand_aliases
alias LG="logger -t ${NAME}"
if [[ -r /etc/default/gpsd ]] ; then
. /etc/default/gpsd
else
echo "Must configure GPSD requirements"
exit 1
fi
function rm_gps_file
{
if [[ -n "${GPS_FIXFILE}" ]] && [[ -f ${GPS_FIXFILE} ]] ; then
rm -f "${GPS_FIXFILE}"
fi
}
function kill_it
{
cmd=$1
pid=$2
sig=$3
((DEBUG)) && LG -p user.info "terminating $cmd(${pid}) with SIG${sig}"
kill -SIG${sig} ${pid} >/dev/null 2>&1
result=$?
((DEBUG)) && LG -p user.info "kill -SIG${sig} ${pid} result is $result"
}
# Most exits are errors, so remove the GPS fix file.
trap rm_gps_file EXIT
if ! [[ -x /usr/bin/gpspipe ]] ; then
LG -p user.err "Please install gpspipe"
exit 0
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
# We use BASHPID because our parent, $$, may have already exited, and
# then ps will not work. BASHPID is the current subshell.
ppid=$BASHPID
pgid=$(ps --no-heading -o pgid -p $ppid)
if ((${#pgid} == 0)) ; then
LG -p user.err "Could not find a pgid for $ppid"
ps -fjp $ppid | LG -p user.error
fi
# pgrep does not work during boot.
pgrpmemb=$(ps --no-heading -o pgid,pid,comm -e | grep '^ *'"${pgid}"' *' | sed -r 's/^ *[0-9]+ *//')
gpspipepid=$(echo "${pgrpmemb}" | egrep '[[:space:]]gpspipe$' | sed 's/[[:space:]].*//')
((DEBUG)) && LG -p user.info "$pgid is pgid $gpspipepid is gpspipepid"
# Find the gpspipepid that is our grandchild
((didkill=0))
# for loop is in case gpspipepid has children.
for p in ${gpspipepid} ; do
if ((${#p})) ; then
kill_it gpspipe $p TERM
((didkill=p))
break
fi
done
if ((didkill == 0)) ; then
exit 0
fi
# Do a sigkill to be sure.
sleep 2
kill_it gpspipe $didkill KILL
) &
fix=""
status=""
# egrep in busybox has a horrible buffering issue.
# echo My shell pid is $$
# echo Place data fix, status
fix="$(gpspipe -w | grep -m1 '{"class":"TPV","device":"/dev/gps0",.*"mode":' | sed -e 's/.*"mode"://' -e 's/[},].*//')"
if ((${#fix} == 0)) ; then
LG -p user.err "No data from GPS"
exit 1
fi
# echo "status is $status. fixOK is $fixOK"
# echo "fix is $fix. Is it in $GPSFIX?"
# Test the GPS fixOK
for x in $GPSFIX ; do
# echo test $x with $fix
if [[ $x == $fix ]] ; then
LG -p user.info "GPS has fix $fix found in list GPSFIX: $GPSFIX"
echo $x >"${GPS_FIXFILE}"
GPS_FIXFILE=""
exit 0
fi
done
LG -p user.info "GPS fix is bad: $fix and should be one of: $GPSFIX"
# Start later
exit 1
|
