comparison mercurial/pure/parsers.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

# 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
import zlib

from ..node import (
    nullrev,

# a special value used internally for `size` if the file is modified/merged/added
NONNORMAL = -1

# a special value used internally for `time` if the time is ambigeous
AMBIGUOUS_TIME = -1


@attr.s(slots=True, init=False)
class DirstateItem(object):
    """represent a dirstate entry

        if has_meaningful_data:
            self._mode = parentfiledata[0]
            self._size = parentfiledata[1]
        if has_meaningful_mtime:
            self._mtime = parentfiledata[2]

    @classmethod
    def from_v1_data(cls, state, mode, size, mtime):
        """Build a new DirstateItem object from V1 data

48221:a32a96079e2d

# 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 stat
import struct
import zlib

from ..node import (
    nullrev,

# a special value used internally for `size` if the file is modified/merged/added
NONNORMAL = -1

# a special value used internally for `time` if the time is ambigeous
AMBIGUOUS_TIME = -1

# Bits of the `flags` byte inside a node in the file format
DIRSTATE_V2_WDIR_TRACKED = 1 << 0
DIRSTATE_V2_P1_TRACKED = 1 << 1
DIRSTATE_V2_P2_INFO = 1 << 2
DIRSTATE_V2_HAS_MODE_AND_SIZE = 1 << 3
DIRSTATE_V2_HAS_MTIME = 1 << 4
DIRSTATE_V2_MODE_EXEC_PERM = 1 << 5
DIRSTATE_V2_MODE_IS_SYMLINK = 1 << 6


@attr.s(slots=True, init=False)
class DirstateItem(object):
    """represent a dirstate entry

        if has_meaningful_data:
            self._mode = parentfiledata[0]
            self._size = parentfiledata[1]
        if has_meaningful_mtime:
            self._mtime = parentfiledata[2]

    @classmethod
    def from_v2_data(cls, flags, size, mtime):
        """Build a new DirstateItem object from V2 data"""
        has_mode_size = bool(flags & DIRSTATE_V2_HAS_MODE_AND_SIZE)
        mode = None
        if has_mode_size:
            assert stat.S_IXUSR == 0o100
            if flags & DIRSTATE_V2_MODE_EXEC_PERM:
                mode = 0o755
            else:
                mode = 0o644
            if flags & DIRSTATE_V2_MODE_IS_SYMLINK:
                mode |= stat.S_IFLNK
            else:
                mode |= stat.S_IFREG
        return cls(
            wc_tracked=bool(flags & DIRSTATE_V2_WDIR_TRACKED),
            p1_tracked=bool(flags & DIRSTATE_V2_P1_TRACKED),
            p2_info=bool(flags & DIRSTATE_V2_P2_INFO),
            has_meaningful_data=has_mode_size,
            has_meaningful_mtime=bool(flags & DIRSTATE_V2_HAS_MTIME),
            parentfiledata=(mode, size, mtime),
        )

    @classmethod
    def from_v1_data(cls, state, mode, size, mtime):
        """Build a new DirstateItem object from V1 data