Merge pull request ddclient#27 from jabaz/master-ubuntu

Prevent service to start multiple times

Added messages if trying to start/stop already started/stopped service.
Added daemon install instructions for ubuntu.

README.md

@@ -72,6 +72,15 @@ INSTALLATION:
     apk add perl
     ## start the first time by hand
     rc-service ddclient start
+
+    ## For those using Ubuntu style rc files and using daemon-mode:
+    cp sample-etc_rc.d_init.d_ddclient.ubuntu /etc/init.d/ddclient
+    ## enable automatic startup when booting
+    update-rc.d ddclient defaults
+    ## make sure you have perl installed 
+    apt-get install perl
+    ## start the first time by hand
+    service ddclient start
 
     ## If you are not using daemon-mode, configure cron and dhcp or ppp
     ## as described below.

sample-etc_rc.d_init.d_ddclient.ubuntu

@@ -20,22 +20,28 @@ test -f $CONF || exit 0
 
 case "$1" in
   start)
-      log_begin_msg "Starting ddclient..."
-      DELAY=`grep -v '^\s*#' $CONF | grep -i -m 1 "daemon" | awk -F '=' '{print $2}'`
-      if [ -z "$DELAY" ] ; then
-        DELAY="-daemon 300"
+      if [ ! -f $PIDFILE ]; then
+        log_begin_msg "Starting ddclient..."
+        DELAY=`grep -v '^\s*#' $CONF | grep -i -m 1 "daemon" | awk -F '=' '{print $2}'`
+        if [ -z "$DELAY" ] ; then
+          DELAY="-daemon 300"
+        else
+          DELAY=''
+        fi
+        start-stop-daemon -S -q -p $PIDFILE -x $DDCLIENT -- $DELAY
+        log_end_msg $?
       else
-        DELAY=''
+        log_warning_msg "Service ddclient already running..."
       fi
-      start-stop-daemon -S -q -p $PIDFILE -x $DDCLIENT -- $DELAY
-      log_end_msg $?
       ;;
   stop)
       if [ -f $PIDFILE ] ; then
         log_begin_msg "Stopping ddclient..."
         start-stop-daemon -K -q -p $PIDFILE
         log_end_msg $?
         rm -f $PIDFILE
+      else
+        log_warning_msg "No ddclient running..."
       fi
       ;;
   restart|reload|force-reload)