Comment 3 for bug 387027

verified fixed in http://ec2-images.ubuntu.com/karmic/20090811.2/ubuntu-
ec2-karmic-amd64.img.gz (ec2-init 0.4.99-0ubuntu2)

$ dpkg-query --showformat '${version}\n' --show "ec2-init"
0.4.99-0ubuntu2

ec2init/__init__.py now has method get_mirror_from_availability_zone that does:

    def get_mirror_from_availability_zone(self, availability_zone):
        if availability_zone.startswith("us"):
            return 'http://us.ec2.archive.ubuntu.com/ubuntu/'
        elif availability_zone.startswith("eu"):
            return 'http://eu.ec2.archive.ubuntu.com/ubuntu/'

        return 'http://archive.ubuntu.com/ubuntu/'

the above essentially does the same as the listed hack.

I'll just note here, that some debug/apparently-dead code leaked in on this.
   __init__.py has a 'location_archive_map' which is completely unused.