Add support for Xnest

shell/Emulator.py

@@ -1,47 +1,59 @@
 import logging
 import os
 import socket
+import sys
 
 from Process import Process
 
+def get_display_number():
+	"""Find a free display number trying to connect to 6000+ ports"""
+	retries = 20
+	display_number = 1
+	display_is_free = False
+	
+	while not display_is_free and retries > 0:
+		s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+		try:
+			s.connect(('127.0.0.1', 6000 + display_number))
+			logging.info('Display %d is already in use. Trying next.' % (display_number))
+			s.close()
+
+			display_number += 1
+			retries -= 1
+		except:
+			display_is_free = True
+
+	if display_is_free:
+		return display_number
+	else:
+		logging.error('Cannot find a free display.')
+		sys.exit(0)
+
 class XephyrProcess(Process):
 	def __init__(self):
-		self._display = self.get_display_number()
+		self._display = get_display_number()
 		cmd = 'Xephyr :%d -ac -screen 640x480' % (self._display) 
 		Process.__init__(self, cmd)
-
-	def get_display_number(self):
-		"""Find a free display number trying to connect to 6000+ ports"""
-		retries = 20
-		display_number = 1
-		display_is_free = False
-		
-		while not display_is_free and retries > 0:
-			s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-			try:
-				s.connect(('127.0.0.1', 6000 + display_number))
-				logging.info('Display %d is already in use. Trying next.' % (display_number))
-				s.close()
-
-				display_number += 1
-				retries -= 1
-			except:
-				display_is_free = True
-
-		if display_is_free:
-			return display_number
-		
-		return -1
 		
 	def get_name(self):
 		return 'Xephyr'
 
 	def start(self):
-		if self._display < 0:
-			logging.error('Cannot find a free display.')
-		else:
-			Process.start(self)
-			os.environ['DISPLAY'] = ":%d" % (self._display)
+		Process.start(self)
+		os.environ['DISPLAY'] = ":%d" % (self._display)
+
+class XnestProcess(Process):
+	def __init__(self):
+		self._display = get_display_number()
+		cmd = 'Xnest :%d -geometry 640x480' % (self._display) 
+		Process.__init__(self, cmd)
+		
+	def get_name(self):
+		return 'Xnest'
+
+	def start(self):
+		Process.start(self)
+		os.environ['DISPLAY'] = ":%d" % (self._display)
 
 class Emulator:
 	"""The OLPC emulator"""
@@ -50,5 +62,13 @@ class Emulator:
 		pass
 	
 	def start(self):
-		process = XephyrProcess()
-		process.start()
+		try:
+			process = XephyrProcess()
+			process.start()
+		except:
+			try:
+				process = XnestProcess()
+				process.start()
+			except:
+				logging.error('Cannot run the emulator. You need to install Xephyr or Xnest.')				
+				sys.exit(0)

shell/Makefile.am

@@ -3,6 +3,7 @@ bin_SCRIPTS = sugar sugar-activity
 sugardir = $(pkgdatadir)/shell
 sugar_PYTHON =				\
 	__init__.py			\
+	ActivitiesModel.py		\
 	ActivityRegistry.py		\
 	ConsoleLogger.py		\
 	Emulator.py			\