Mercurial > hg
view mercurial/dirstateutils/docket.py @ 47966:681851d6409b
dirstate-v2: Remove the `.d` suffix in data file names
It could cause confusion since `.d` is already used for revlogs.
This suffix is not necessary since there is already a `dirstate.` prefix.
Differential Revision: https://phab.mercurial-scm.org/D11413
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 26 Jul 2021 10:26:45 +0200 |
parents | 852262e2e7d9 |
children | d467e44f71d7 |
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# dirstatedocket.py - docket file for dirstate-v2 # # Copyright Mercurial Contributors # # 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 struct from ..revlogutils import docket as docket_mod V2_FORMAT_MARKER = b"dirstate-v2\n" # Must match the constant of the same name in # `rust/hg-core/src/dirstate_tree/on_disk.rs` TREE_METADATA_SIZE = 44 # * 12 bytes: format marker # * 32 bytes: node ID of the working directory's first parent # * 32 bytes: node ID of the working directory's second parent # * 4 bytes: big-endian used size of the data file # * {TREE_METADATA_SIZE} bytes: tree metadata, parsed separately # * 1 byte: length of the data file's UUID # * variable: data file's UUID # # Node IDs are null-padded if shorter than 32 bytes. # A data file shorter than the specified used size is corrupted (truncated) HEADER = struct.Struct( ">{}s32s32sL{}sB".format(len(V2_FORMAT_MARKER), TREE_METADATA_SIZE) ) class DirstateDocket(object): data_filename_pattern = b'dirstate.%s' def __init__(self, parents, data_size, tree_metadata, uuid): self.parents = parents self.data_size = data_size self.tree_metadata = tree_metadata self.uuid = uuid @classmethod def with_new_uuid(cls, parents, data_size, tree_metadata): return cls(parents, data_size, tree_metadata, docket_mod.make_uid()) @classmethod def parse(cls, data, nodeconstants): if not data: parents = (nodeconstants.nullid, nodeconstants.nullid) return cls(parents, 0, b'', None) marker, p1, p2, data_size, meta, uuid_size = HEADER.unpack_from(data) if marker != V2_FORMAT_MARKER: raise ValueError("expected dirstate-v2 marker") uuid = data[HEADER.size : HEADER.size + uuid_size] p1 = p1[: nodeconstants.nodelen] p2 = p2[: nodeconstants.nodelen] return cls((p1, p2), data_size, meta, uuid) def serialize(self): p1, p2 = self.parents header = HEADER.pack( V2_FORMAT_MARKER, p1, p2, self.data_size, self.tree_metadata, len(self.uuid), ) return header + self.uuid def data_filename(self): return self.data_filename_pattern % self.uuid