mercurial/node.py

verify: add a note about a paleo-bug

In the very early days of hg, it was possible to commit /dev/null because our
patch importer was too simple. Repos from this era may still
exist, add a note about why we ignore this name.

# node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import binascii

nullrev = -1
nullid = "\0" * 20

# This ugly style has a noticeable effect in manifest parsing
hex = binascii.hexlify
bin = binascii.unhexlify

def short(node):
    return hex(node[:6])