Walking with symlinks

gistfile1.py

def do_some_walkin(start_path, matches=None):
  if matches == None:
    matches = []
  for root, dirs, files in os.walk(start_path, followlinks=True):
    for dir in dirs:
      if os.path.islink(os.path.join(root,dir)):
        do_some_walkin(os.path.join(root,dir), matches)
    root = root.replace(settings.RRD_DIR, '')
    for basename in files:
      if fnmatch.fnmatch(basename, '*.rrd'):
        absolute_path = os.path.join(settings.RRD_DIR, root, basename)
        (basename,extension) = os.path.splitext(basename)
        metric_path = os.path.join(root, basename)
        rrd = RRDFile(absolute_path, metric_path)
        for datasource_name in rrd.getDataSources():
          matches.append(os.path.join(metric_path, datasource_name.name))
  return matches