[XEND] Add some sort of rudimentary version embedding into the source

so we can report the Xend version number as opposed to Xen's version
number.

Signed-off-by: Alastair Tse <atse@xensource.com>

tools/python/setup.py

@@ -1,7 +1,39 @@
+#!/usr/bin/python
 
 from distutils.core import setup, Extension
 import os
 
+XEN_TOOLS_VERSION = '3.0.4'
+
+def embed_version():
+    """ Embed Mercurial Changeset Version in xen/__init__.py. """
+    try:
+        import commands
+        import re
+        output = commands.getoutput('hg tip')
+        version = XEN_TOOLS_VERSION
+        changeset = ''
+        date = ''
+        if output:
+            for line in output.split('\n'):
+                is_changeset = re.search(r'^changeset:\s*(.*)$', line)
+                if is_changeset:
+                    changeset = is_changeset.group(1)
+                is_date = re.search(r'^date:\s*(.*)$', line)
+                if is_date:
+                    date = is_date.group(1)
+
+        xen_init = open('xen/__init__.py', 'w')
+        xen_init.write('# Warning, this file is autogenerated by setup.py\n')
+        if version and changeset and date:
+            xen_init.write('VERSION = "%s-%s (%s)"\n' %
+                           (version, changeset, date))
+        else:
+            xen_init.write('VERSION = "%s"\n' % version)
+        xen_init.close()
+    except:
+        print 'Warning: Unable to extract version.'
+
 XEN_ROOT = "../.."
 
 extra_compile_args  = [ "-fno-strict-aliasing", "-Wall", "-Werror" ]
@@ -38,8 +70,11 @@ acm = Extension("acm",
                libraries          = libraries,
                sources            = [ "xen/lowlevel/acm/acm.c" ])
 
+
+embed_version()
+
 setup(name            = 'xen',
-      version         = '3.0',
+      version         = XEN_TOOLS_VERSION,
       description     = 'Xen',
       packages        = ['xen',
                          'xen.lowlevel',