Fixed #5215 -- Added Subversion revision number to Django version string. Thanks for the patch, Deryck Hodge

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5990 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/version.py

@@ -0,0 +1,33 @@
+import django
+import os.path
+import re
+
+def get_svn_revision():
+    """
+    Returns the SVN revision in the form SVN-XXXX,
+    where XXXX is the revision number.
+
+    Returns SVN-unknown if anything goes wrong, such as an unexpected
+    format of internal SVN files.
+    """
+    rev = None
+    entries_path = '%s/.svn/entries' % django.__path__[0]
+
+    if os.path.exists(entries_path):
+        entries = open(entries_path, 'r').read()
+        # Versions >= 7 of the entries file are flat text.  The first line is
+        # the version number. The next set of digits after 'dir' is the revision.
+        if re.match('(\d+)', entries):
+            rev_match = re.search('\d+\s+dir\s+(\d+)', entries)
+            if rev_match:
+                rev = rev_match.groups()[0]
+        # Older XML versions of the file specify revision as an attribute of
+        # the first entries node.
+        else:
+            from xml.dom import minidom
+            dom = minidom.parse(entries_path)
+            rev = dom.getElementsByTagName('entry')[0].getAttribute('revision')
+
+    if rev:
+        return u'SVN-%s' % rev
+    return u'SVN-unknown'