CML2 rule file is autogenerated from arm.cml and the containers template

Container rules are too many and repetitive for each container. With this
change, the cml file is autogenerated from a container template cml and
the architecture cml, e.g. arm.cml. -c option determines the number of
containers. See build.py -h for more.

build.py

@@ -13,6 +13,8 @@ from config.projpaths import *
 from config.configuration import *
 from scripts.conts import containers
 from configure import *
+from optparse import OptionParser
+from scripts.cml.generate_container_cml import *
 
 # NOTE:
 # The scripts obtain all the configuration data (a set of class
@@ -20,10 +22,43 @@ from configure import *
 # any arguments here.
 
 def main():
+    autogen_true = 0
+    usage = "usage: %prog [options] arg"
+    parser = OptionParser(usage)
+
+    parser.add_option("-a", "--arch", type = "string", dest = "arch",
+                      help = "Use configuration file for architecture")
+    parser.add_option("-c", "--num-containers", type = "int", dest = "ncont",
+                      help = "Maximum number of containers available in configuration")
+    parser.add_option("-f", "--use-file", dest = "cml_file",
+                      help = "Supply user-defined cml file"
+                             "(Use only if you want to override default)")
+    parser.add_option("-w", "--wipeout-old-config", action = "store_true",
+                      default = False, dest = "wipeout",
+                      help = "Wipe out existing configuration file settings")
+
+    (options, args) = parser.parse_args()
+
+    autogen_true = len(sys.argv) > 1 or not os.path.exists(CML2_CML_FILE)
+
+    if autogen_true and not options.arch:
+        print "No arch supplied (-a), using `arm' as default."
+        options.arch = "arm"
+    if autogen_true and not options.ncont:
+        options.ncont = 4
+        print "Max container count not supplied (-c), using %d as default." % options.ncont
+
+    # Regenerate cml file if options are supplied or the file doesn't exist.
+    if autogen_true:
+        generate_container_cml(options.arch, options.ncont)
+        if options.wipeout == 1 and os.path.exists(CML2_OLDCONFIG_FILE):
+            print "Deleting %s" % CML2_OLDCONFIG_FILE
+            os.remove(CML2_OLDCONFIG_FILE)
+
     #
     # Configure
     #
-    configure_kernel(join(CML2_CONFIG_SRCDIR, 'arm.cml'))
+    configure_kernel(CML2_CML_FILE)
 
     #
     # Build the kernel