integrate exmachina configuration management layer

- add exmachina code and test code
- modify plinth.py to listen for shared secret on stdin at start
  (if appropriate flag is set) and try to connect to exmachina daemon
- use exmachina to read and set /etc/hostname as a demo
- update plinth init.d script to start exmachina and share keys
- update docs with new deps and run instructions

1 files changed, 41 insertions, 4 deletions

diff --git a/share/init.d/plinth b/share/init.d/plinth
index e364fc1..8cf88a9 100755
--- a/share/init.d/plinth
+++ b/share/init.d/plinth
@@ -12,23 +12,53 @@
 
 # This file is /etc/init.d/plinth
 DAEMON=/usr/local/bin/plinth.py
+EXMACHINA_DAEMON=/usr/local/bin/exmachina.py
 PID_FILE=/var/run/plinth.pid
-    
+EXMACHINA_PID_FILE=/var/run/exmachina.pid
+
+PLINTH_USER=www-data
+PLINTH_GROUP=www-data
+
+test -x $DAEMON || exit 0
+test -x $EXMACHINA_DAEMON || exit 0
+
+set -e
+
+. /lib/lsb/init-functions
+
 start_plinth (){
     if [ -f $PID_FILE ]; then
-	echo Already running with a pid of `cat $PID_FILE`.
+      echo Already running with a pid of `cat $PID_FILE`.
     else
-	$DAEMON --pidfile=$PID_FILE
+        if [ -f $EXMACHINA_PID_FILE ]; then
+        echo exmachina was already running with a pid of `cat $EXMACHINA_PID_FILE`.
+        kill -15 `cat $EXMACHINA_PID_FILE`
+        rm -rf $EXMACHINA_PID_FILE
+        fi
+        SHAREDKEY=`$EXMACHINA_DAEMON --random-key`
+        touch $PID_FILE
+        chown $PLINTH_USER:$PLINTH_GROUP $PID_FILE
+        echo $SHAREDKEY | $EXMACHINA_DAEMON --pidfile=$EXMACHINA_PID_FILE || rm $PID_FILE
+        sleep 0.5
+        echo $SHAREDKEY | sudo -u $PLINTH_USER -g $PLINTH_GROUP $DAEMON --pidfile=$PID_FILE
     fi
 }
 
 stop_plinth () {
     if [ -f $PID_FILE ]; then
-	kill -15 `cat $PID_FILE`
+	kill -15 `cat $PID_FILE` || true
 	rm -rf $PID_FILE
+    echo "killed plinth"
     else
 	echo "No pid file at $PID_FILE suggests plinth is not running."
     fi
+    if [ -f $EXMACHINA_PID_FILE ]; then
+	kill -15 `cat $EXMACHINA_PID_FILE` || true
+	rm -rf $EXMACHINA_PID_FILE
+    echo "killed exmachina"
+    else
+	echo "No pid file at $EXMACHINA_PID_FILE suggests exmachina is not running."
+    fi
 }
 
 test -x $DAEMON || exit 0
@@ -45,5 +75,12 @@ case "$1" in
         $0 stop
         $0 start
         ;;
+	status)
+		status_of_proc -p $PID_FILE "$DAEMON" plinth && exit 0 || exit $?
+		;;
+	*)
+		echo "Usage: $NAME {start|stop|restart|status}" >&2
+		exit 1
+		;;
         
 esac