detect-debmirror

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# License: GPLv3
# Authors: Christian Seiler <christian@iwakd.de>
# Requires at least python-apt 0.7.100 (the one of Squeeze)
# Will probably only work with Python 2.x
# (does python-apt support 3.x?)

import apt_pkg
import apt.progress.base
import sys

apt_pkg.init_config()
apt_pkg.init_system()

class NullProgress(apt.progress.base.OpProgress):
  def done(self,*args):
    return
  
  # python-apt 0.7.100 (Squeeze) and 0.8.8 have
  # a different signature for the update() method;
  # we don't care, we just want to override it so
  # it doesn't show anything
  def update(self,*args):
    return

cache = apt_pkg.Cache(NullProgress())
source_list = apt_pkg.SourceList()
source_list.read_main_list()

indexes = {}

for pkg in cache.packages:
  if pkg.essential:
    version = pkg.current_ver
    for file, dummy in version.file_list:
      idx = source_list.find_index(file)
      if idx is not None:
        uri = idx.archive_uri('')
        if not uri in indexes:
          indexes[uri] = 1
        else:
          indexes[uri] = indexes[uri] + 1

indexes_sorted = sorted(indexes.items(), lambda a, b: cmp(a[1], b[1]))

if len(indexes_sorted) < 1:
  print >>sys.stderr, "No indexes found for essential packages."
  sys.exit(1)

print indexes_sorted[-1][0]