view mercurial/httprangereader.py @ 1721:801756d0ca84

add pretxncommit hook.

hook allows check of changeset after create, but before transaction
is committed.  hook failure rolls transaction back.

makes place for local policies like commit message must contain bug id
or reviewer signoff.

change also adds parent changeset ids to commit hook environment,
because is cheap and useful.

# httprangereader.py - just what it says
#
# Copyright 2005 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
        req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
        f = urllib2.urlopen(req)
        return f.read()