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

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

48220:e7b5e8ba7cab

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
# * {TREE_METADATA_SIZE} bytes: tree metadata, parsed separately

# * 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(
    ">{}s32s32s{}sLB".format(len(V2_FORMAT_MARKER), TREE_METADATA_SIZE)
)


class DirstateDocket(object):
    data_filename_pattern = b'dirstate.%s'

48221:a32a96079e2d

from __future__ import absolute_import

import struct

from ..revlogutils import docket as docket_mod
from . import v2

V2_FORMAT_MARKER = b"dirstate-v2\n"

# * 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
# * {TREE_METADATA_SIZE} bytes: tree metadata, parsed separately

# * 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(
    ">{}s32s32s{}sLB".format(len(V2_FORMAT_MARKER), v2.TREE_METADATA_SIZE)
)


class DirstateDocket(object):
    data_filename_pattern = b'dirstate.%s'