Add option --pidfile to create a pid file when running as a daemon.

Headphones.py

@@ -34,6 +34,7 @@ def main():
     parser.add_argument('--datadir', help='Specify a directory where to store your data files')
     parser.add_argument('--config', help='Specify a config file to use')
     parser.add_argument('--nolaunch', action='store_true', help='Prevent browser from launching on startup')
+    parser.add_argument('--pidfile', help='Create a pid file (only relevant when running as a daemon)')
     
     args = parser.parse_args()
     
@@ -43,7 +44,9 @@ def main():
     if args.daemon:
         headphones.DAEMON=True
         headphones.QUIET=True
-        
+        if args.pidfile :
+            headphones.PIDFILE = args.pidfile
+
     if args.datadir:
         headphones.DATA_DIR = args.datadir
     else:
@@ -75,7 +78,7 @@ def main():
         
     if headphones.DAEMON:
         headphones.daemonize()
-        
+
     # Force the http port if neccessary
     if args.port:
         http_port = args.port

headphones/__init__.py

@@ -22,6 +22,7 @@ SIGNAL = None
 
 QUIET = False
 DAEMON = False
+PIDFILE= None
 
 SCHED = Scheduler()
 
@@ -346,9 +347,13 @@ def daemonize():
     os.dup2(si.fileno(), sys.stdin.fileno())
     os.dup2(so.fileno(), sys.stdout.fileno())
     os.dup2(se.fileno(), sys.stderr.fileno())
-    
-    logger.info('Daemonized to PID: %s' % os.getpid())
-    
+
+    pid = os.getpid()
+    logger.info('Daemonized to PID: %s' % pid)
+    if PIDFILE:
+        logger.info('Writing PID %s to %s' % (pid, PIDFILE))
+        file(PIDFILE, 'w').write("%s\n" % pid)
+
 def launch_browser(host, port, root):
 
     if host == '0.0.0.0':
@@ -558,7 +563,11 @@ def shutdown(restart=False, update=False):
             versioncheck.update()
         except Exception, e:
             logger.warn('Headphones failed to update: %s. Restarting.' % e) 
-            
+
+    if PIDFILE :
+        logger.info ('Removing pidfile %s' % PIDFILE)
+        os.remove(PIDFILE)
+        
     if restart:
     	logger.info('Headphones is restarting...')
         popen_list = [sys.executable, FULL_PATH]