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comparison mercurial/dirstateutils/docket.py @ 48221:a32a96079e2d

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dirstate-v2: initial Python parser The dirstate-v2 file format should be supported even if Rust extensions are not enabled. This changeset adds parsing code that is not used yet. Differential Revision: https://phab.mercurial-scm.org/D11518
author Simon Sapin <simon.sapin@octobus.net>
date Sun, 03 Oct 2021 13:18:03 +0200
parents d467e44f71d7
children 6000f5b25c9b
comparison
equal deleted inserted replaced
48220:e7b5e8ba7cab 48221:a32a96079e2d
8 from __future__ import absolute_import 8 from __future__ import absolute_import
9 9
10 import struct 10 import struct
11 11
12 from ..revlogutils import docket as docket_mod 12 from ..revlogutils import docket as docket_mod
13 13 from . import v2
14 14
15 V2_FORMAT_MARKER = b"dirstate-v2\n" 15 V2_FORMAT_MARKER = b"dirstate-v2\n"
16
17 # Must match the constant of the same name in
18 # `rust/hg-core/src/dirstate_tree/on_disk.rs`
19 TREE_METADATA_SIZE = 44
20 16
21 # * 12 bytes: format marker 17 # * 12 bytes: format marker
22 # * 32 bytes: node ID of the working directory's first parent 18 # * 32 bytes: node ID of the working directory's first parent
23 # * 32 bytes: node ID of the working directory's second parent 19 # * 32 bytes: node ID of the working directory's second parent
24 # * {TREE_METADATA_SIZE} bytes: tree metadata, parsed separately 20 # * {TREE_METADATA_SIZE} bytes: tree metadata, parsed separately
27 # * variable: data file's UUID 23 # * variable: data file's UUID
28 # 24 #
29 # Node IDs are null-padded if shorter than 32 bytes. 25 # Node IDs are null-padded if shorter than 32 bytes.
30 # A data file shorter than the specified used size is corrupted (truncated) 26 # A data file shorter than the specified used size is corrupted (truncated)
31 HEADER = struct.Struct( 27 HEADER = struct.Struct(
32 ">{}s32s32s{}sLB".format(len(V2_FORMAT_MARKER), TREE_METADATA_SIZE) 28 ">{}s32s32s{}sLB".format(len(V2_FORMAT_MARKER), v2.TREE_METADATA_SIZE)
33 ) 29 )
34 30
35 31
36 class DirstateDocket(object): 32 class DirstateDocket(object):
37 data_filename_pattern = b'dirstate.%s' 33 data_filename_pattern = b'dirstate.%s'