mercurial/changegroup.py
author Alexis S. L. Carvalho <alexis@cecm.usp.br>
Mon, 16 Oct 2006 15:38:53 -0300
changeset 3415 ec6f400cff4d
parent 2470 fe1689273f84
child 3666 025f68f22ae2
permissions -rw-r--r--
Use a case-sensitive version of SafeConfigParser everywhere This change has the potential to break existing setups, but the current behaviour (the keys in configuration files are always lower-cased) can bite us in a few places: - no way to use a Command in [defaults] - hgext.Extension doesn't work in [extensions] - you can't use an Upper/case/PATH in the [paths] section of hgweb.config - you can't (easily) protect paths with upper-case letters with the acl extension - you can't specify a /Path/TO/a/rEPO in the [reposubs] section for the notify extension

"""
changegroup.py - Mercurial changegroup manipulation functions

 Copyright 2006 Matt Mackall <mpm@selenic.com>

This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
"""
from i18n import gettext as _
from demandload import *
demandload(globals(), "struct util")

def getchunk(source):
    """get a chunk from a changegroup"""
    d = source.read(4)
    if not d:
        return ""
    l = struct.unpack(">l", d)[0]
    if l <= 4:
        return ""
    d = source.read(l - 4)
    if len(d) < l - 4:
        raise util.Abort(_("premature EOF reading chunk"
                           " (got %d bytes, expected %d)")
                          % (len(d), l - 4))
    return d

def chunkiter(source):
    """iterate through the chunks in source"""
    while 1:
        c = getchunk(source)
        if not c:
            break
        yield c

def genchunk(data):
    """build a changegroup chunk"""
    header = struct.pack(">l", len(data)+ 4)
    return "%s%s" % (header, data)

def closechunk():
    return struct.pack(">l", 0)