From 94ec4baeb66a9bf1bfb2d86b532403514f2175c6 Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Thu, 12 Jan 2017 16:31:34 -0600
Subject: Add script to set the system clock directly from the GPS.

---
 recipes-navigation/gpsd/gpsd/gpsd_ubx_settime.sh | 47 ++++++++++++++++++++++++
 recipes-navigation/gpsd/gpsd_3.16.bb             |  4 +-
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100755 recipes-navigation/gpsd/gpsd/gpsd_ubx_settime.sh

(limited to 'recipes-navigation')

diff --git a/recipes-navigation/gpsd/gpsd/gpsd_ubx_settime.sh b/recipes-navigation/gpsd/gpsd/gpsd_ubx_settime.sh
new file mode 100755
index 0000000..7f22719
--- /dev/null
+++ b/recipes-navigation/gpsd/gpsd/gpsd_ubx_settime.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+# PPS= 1484247472.29561104 clock= 1484247990.00000000 offset= 517.704388959
+
+trap "stty echo icanon" exit
+
+OIFS=$IFS
+IFS=$'\n'
+if ! /usr/sbin/gpsd_ubx_fixed ; then
+   logger -e -p user.warn "GPS does not have a fix yet.  Try again later."
+   exit 1
+fi
+# This shell script is shaped by two things:
+#   Lousy performance of sed and grep when used with gpsmon
+#   Need to terminate 
+# Terminate gpsmon after 10 seconds if it is our child          
+(                                                               
+  sleep 10                                                      
+  ppid=$$                                                       
+  gpsmonpid=$(ps -o pid,ppid,comm -e | egrep "[[:space:]]${ppid}[[:space:]]+gpsmon$" | sed -r 's/^[[:space:]]*([0-9]*)[[:space:]]+.*/\1/')
+  if ((${#gpsmonpid})) ; then                                                                                                             
+    logger -p user.info "terminating gpscat(${gpsmonpid}) with SIGTERM"                                                                   
+    kill ${gpsmonpid}                                                                                                                     
+  else                                                                                                                                    
+    exit 0                                                                                                                                
+  fi                                                                                                                                      
+  sleep 2                                                                                                                                 
+  gpsmonpid=$(ps -o pid,ppid,comm -e | egrep "[[:space:]]${ppid}[[:space:]]+gpsmon$" | sed -r 's/^[[:space:]]*([0-9]*)[[:space:]]+.*/\1/')
+  if ((${#gpsmonpid})) ; then                                                                                                             
+    logger -p user.info "terminating gpscat(${gpsmonpid}) with SIGKILL"                                                                   
+    kill -9 ${gpsmonpid}                                                                                                                  
+  fi                                                                                                                                      
+) &                                                                                                                                       
+                    
+                    
+epoch=$(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
+  date +%s -s @${epoch} >/dev/null
+else
+  logger user.err "gpsmon output is bad."
+  exit 1
+fi
+exit 0
diff --git a/recipes-navigation/gpsd/gpsd_3.16.bb b/recipes-navigation/gpsd/gpsd_3.16.bb
index f2a5c05..e5b3207 100644
--- a/recipes-navigation/gpsd/gpsd_3.16.bb
+++ b/recipes-navigation/gpsd/gpsd_3.16.bb
@@ -17,6 +17,7 @@ SRC_URI = "${SAVANNAH_GNU_MIRROR}/${BPN}/${BP}.tar.gz \
     file://gpsd-default \
     file://gpsd \
     file://gpsd_ubx_fixed.sh \
+    file://gpsd_ubx_settime.sh \
     file://60-gpsd.rules \
     file://gpsd.service \
 "
@@ -91,6 +92,7 @@ do_install_append() {
     install -m 0644 ${WORKDIR}/gpsd-default ${D}/${sysconfdir}/default/gpsd.default
     install -d ${D}${sbindir}
     install -m 0755 ${WORKDIR}/gpsd_ubx_fixed.sh ${D}${sbindir}/gpsd_ubx_fixed
+    install -m 0755 ${WORKDIR}/gpsd_ubx_settime.sh ${D}${sbindir}/gpsd_ubx_settime
 
     # UDEV code assumed a USB GPS.
 
@@ -133,7 +135,7 @@ SUMMARY_libgps = "C service library used for communicating with gpsd"
 FILES_libgps = "${libdir}/libgps.so.*"
 
 SUMMARY_gpsd-conf = "gpsd configuration files and init scripts"
-FILES_gpsd-conf = "${sysconfdir} ${sbindir}/gpsd_ubx_fixed"
+FILES_gpsd-conf = "${sysconfdir} ${sbindir}/gpsd_ubx_fixed ${sbindir}/gpsd_ubx_settime"
 CONFFILES_gpsd-conf = "${sysconfdir}/default/gpsd.default"
 
 SUMMARY_gpsd-gpsctl = "Tool for tweaking GPS modes"
-- 
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