view mercurial/httprangereader.py @ 7178:98b6c3dde237

Fix Debian bug #494889 (fetching from static-http://... broken)

Changeset 6605a03cbf87 which fixed issue965 (hg clone static-http
does not work for empty repos) broke cloning of repos with old layout
(without store) via static-http.

This fix makes cloning from old-style repositories possible again,
but will not allow cloning of empty old-style repositories as this
can not be detected reliably.

# httprangereader.py - just what it says
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import byterange, urllib2

class httprangereader(object):
    def __init__(self, url):
        self.url = url
        self.pos = 0
    def seek(self, pos):
        self.pos = pos
    def read(self, bytes=None):
        opener = urllib2.build_opener(byterange.HTTPRangeHandler())
        urllib2.install_opener(opener)
        req = urllib2.Request(self.url)
        end = ''
        if bytes:
            end = self.pos + bytes - 1
        req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
        f = urllib2.urlopen(req)
        data = f.read()
        if bytes:
            data = data[:bytes]
        return data