view mercurial/node.py @ 12937:6ff784de7c3a stable

util: refactor opener

- Don't call atomictempfile or nlinks() if the path is malformed
  (no basename). Let posixfile() raise IOError directly.
- atomictempfile already breaks up hardlinks, no need to poke
  at the file with nlinks() if atomictemp.
- No need to copy the file contents to break hardlinks for 'w'rite
  modes (w, wb, w+, w+b). Unlinking and recreating the file is faster.

# 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])