1 files changed, 39 insertions, 0 deletions
diff --git a/webapp/django/utils/version.py b/webapp/django/utils/version.py
new file mode 100644
index 0000000000..cf8085653f
--- /dev/null
+++ b/webapp/django/utils/version.py
@@ -0,0 +1,39 @@
+import django
+import os.path
+import re
+
+def get_svn_revision(path=None):
+    """
+    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.
+
+    If path is provided, it should be a directory whose SVN info you want to
+    inspect. If it's not provided, this will use the root django/ package
+    directory.
+    """
+    rev = None
+    if path is None:
+        path = django.__path__[0]
+    entries_path = '%s/.svn/entries' % path
+
+    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'