LOG_QUIET, result checking, partially fixes #4

petrified

@@ -65,6 +65,9 @@ USE_SYSLOG=0
 USE_STDOUT=0
 USE_LOGFILE=0
 
+## If set, does not log if the IP has not changed
+LOG_QUIET=0
+
 ## If USE_LOGFILE is 1, where to log
 PET_LOG=/var/log/petrified.log
 
@@ -214,16 +217,27 @@ if (( ${USE_LIP} == 1 )); then
 fi
 
 # If they don't match, tell upstream
+__UPDATED=0
 if [[ "${OLDIP}" != "${NEWIP}" ]]; then
   UPDURL="${DDNS_URL}${DDNS_KEY}/?ip=${NEWIP}"
   RESULT=$(curl -m ${CURL_WAIT} -sk "${UPDURL}" 2>/dev/null)
   logmsg "${RESULT}"
+  # "Updated foo from 1.2.3.4 to 5.6.7.8"
+  # "No IP change detected for foo with IP 1.2.3.4, skipping update"
+  _RE1='^Updated'
+  _RE2='^No IP change detected'
+  if [[ ${RESULT} =~ ${_RE1} ]] || [[ ${RESULT} =~ ${_RE2} ]]; then
+    # if _RE2 matched, our PET_LIP is stale
+    __UPDATED=1
+  fi
 else
-  logmsg "IP ${NEWIP} hasn't changed, not updating."
+  if (( ${LOG_QUIET} == 0 )); then
+    logmsg "IP ${NEWIP} hasn't changed, not updating."
+  fi
 fi
 
 # Save the new IP if configured
-if (( ${USE_LIP} == 1 )); then
+if (( ${USE_LIP} == 1 )) && (( ${__UPDATED} == 1 )); then
   if (( $(touch "${PET_LIP}" 2>/dev/null; echo $?;) != 0 )); then
     logmsg "USE_LIP=1 but cannot write to ${PET_LIP}."
   else

petrified.conf

@@ -56,6 +56,10 @@ DDNS_CHECK="http://4.icanhazip.com"
 #USE_STDOUT=0
 #USE_LOGFILE=0
 
+# If set, does not log if the IP has not changed {0,1}
+#
+#LOG_QUIET=0
+
 # If USE_LOGFILE is 1, where to log {<string>}
 #
 #PET_LOG=/var/log/petrified.log