Mercurial > public > mercurial-scm > hg-stable
view mercurial/node.py @ 47682:78f7f0d490ee
dirstate-v2: Move fixed-size tree metadata into the docket file
Before this changeset, the dirstate-v2 data file contained not only nodes
and paths that may be reused when appending to an existing file,
but also some fixed-size metadata that applies to the entire tree
and was added at the end of the data file for every append.
This moves that metadata into the docket file, so that repeated "append"
operations without meaningful changes don?t actually need to grow any file.
Differential Revision: https://phab.mercurial-scm.org/D11098
author | Simon Sapin <simon.sapin@octobus.net> |
---|---|
date | Thu, 15 Jul 2021 23:02:17 +0200 |
parents | d4ba4d51f85f |
children | 6000f5b25c9b |
line wrap: on
line source
# node.py - basic nodeid manipulation for mercurial # # Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import binascii # This ugly style has a noticeable effect in manifest parsing hex = binascii.hexlify # Adapt to Python 3 API changes. If this ends up showing up in # profiles, we can use this version only on Python 3, and forward # binascii.unhexlify like we used to on Python 2. def bin(s): try: return binascii.unhexlify(s) except binascii.Error as e: raise TypeError(e) def short(node): return hex(node[:6]) nullrev = -1 # pseudo identifier for working directory # (experimental, so don't add too many dependencies on it) wdirrev = 0x7FFFFFFF class sha1nodeconstants(object): nodelen = 20 # In hex, this is '0000000000000000000000000000000000000000' nullid = b"\0" * nodelen nullhex = hex(nullid) # Phony node value to stand-in for new files in some uses of # manifests. # In hex, this is '2121212121212121212121212121212121212121' newnodeid = b'!!!!!!!!!!!!!!!!!!!!' # In hex, this is '3030303030303030303030303030306164646564' addednodeid = b'000000000000000added' # In hex, this is '3030303030303030303030306d6f646966696564' modifiednodeid = b'000000000000modified' wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid} # pseudo identifier for working directory # (experimental, so don't add too many dependencies on it) # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff' wdirid = b"\xff" * nodelen wdirhex = hex(wdirid) # legacy starting point for porting modules nullid = sha1nodeconstants.nullid nullhex = sha1nodeconstants.nullhex newnodeid = sha1nodeconstants.newnodeid addednodeid = sha1nodeconstants.addednodeid modifiednodeid = sha1nodeconstants.modifiednodeid wdirfilenodeids = sha1nodeconstants.wdirfilenodeids wdirid = sha1nodeconstants.wdirid wdirhex = sha1nodeconstants.wdirhex