|
|
# revlogdeltas.py - constant used for revlog logic
|
|
|
#
|
|
|
# Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
|
|
|
# Copyright 2018 Octobus <contact@octobus.net>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
"""Helper class to compute deltas stored inside revlogs"""
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
import struct
|
|
|
|
|
|
from ..interfaces import repository
|
|
|
|
|
|
### Internal utily constants
|
|
|
|
|
|
KIND_CHANGELOG = 1001 # over 256 to not be comparable with a bytes
|
|
|
KIND_MANIFESTLOG = 1002
|
|
|
KIND_FILELOG = 1003
|
|
|
KIND_OTHER = 1004
|
|
|
|
|
|
ALL_KINDS = {
|
|
|
KIND_CHANGELOG,
|
|
|
KIND_MANIFESTLOG,
|
|
|
KIND_FILELOG,
|
|
|
KIND_OTHER,
|
|
|
}
|
|
|
|
|
|
### main revlog header
|
|
|
|
|
|
INDEX_HEADER = struct.Struct(b">I")
|
|
|
|
|
|
## revlog version
|
|
|
REVLOGV0 = 0
|
|
|
REVLOGV1 = 1
|
|
|
# Dummy value until file format is finalized.
|
|
|
REVLOGV2 = 0xDEAD
|
|
|
|
|
|
## global revlog header flags
|
|
|
# Shared across v1 and v2.
|
|
|
FLAG_INLINE_DATA = 1 << 16
|
|
|
# Only used by v1, implied by v2.
|
|
|
FLAG_GENERALDELTA = 1 << 17
|
|
|
REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
|
|
|
REVLOG_DEFAULT_FORMAT = REVLOGV1
|
|
|
REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
|
|
|
REVLOGV0_FLAGS = 0
|
|
|
REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
|
|
|
REVLOGV2_FLAGS = FLAG_INLINE_DATA
|
|
|
|
|
|
### individual entry
|
|
|
|
|
|
## index v0:
|
|
|
# 4 bytes: offset
|
|
|
# 4 bytes: compressed length
|
|
|
# 4 bytes: base rev
|
|
|
# 4 bytes: link rev
|
|
|
# 20 bytes: parent 1 nodeid
|
|
|
# 20 bytes: parent 2 nodeid
|
|
|
# 20 bytes: nodeid
|
|
|
INDEX_ENTRY_V0 = struct.Struct(b">4l20s20s20s")
|
|
|
|
|
|
## index v1
|
|
|
# 6 bytes: offset
|
|
|
# 2 bytes: flags
|
|
|
# 4 bytes: compressed length
|
|
|
# 4 bytes: uncompressed length
|
|
|
# 4 bytes: base rev
|
|
|
# 4 bytes: link rev
|
|
|
# 4 bytes: parent 1 rev
|
|
|
# 4 bytes: parent 2 rev
|
|
|
# 32 bytes: nodeid
|
|
|
INDEX_ENTRY_V1 = struct.Struct(b">Qiiiiii20s12x")
|
|
|
assert INDEX_ENTRY_V1.size == 32 * 2
|
|
|
|
|
|
# 6 bytes: offset
|
|
|
# 2 bytes: flags
|
|
|
# 4 bytes: compressed length
|
|
|
# 4 bytes: uncompressed length
|
|
|
# 4 bytes: base rev
|
|
|
# 4 bytes: link rev
|
|
|
# 4 bytes: parent 1 rev
|
|
|
# 4 bytes: parent 2 rev
|
|
|
# 32 bytes: nodeid
|
|
|
# 8 bytes: sidedata offset
|
|
|
# 4 bytes: sidedata compressed length
|
|
|
# 20 bytes: Padding to align to 96 bytes (see RevlogV2Plan wiki page)
|
|
|
INDEX_ENTRY_V2 = struct.Struct(b">Qiiiiii20s12xQi20x")
|
|
|
assert INDEX_ENTRY_V2.size == 32 * 3
|
|
|
|
|
|
# revlog index flags
|
|
|
|
|
|
# For historical reasons, revlog's internal flags were exposed via the
|
|
|
# wire protocol and are even exposed in parts of the storage APIs.
|
|
|
|
|
|
# revision has censor metadata, must be verified
|
|
|
REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
|
|
|
# revision hash does not match data (narrowhg)
|
|
|
REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
|
|
|
# revision data is stored externally
|
|
|
REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
|
|
|
# revision changes files in a way that could affect copy tracing.
|
|
|
REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
|
|
|
REVIDX_DEFAULT_FLAGS = 0
|
|
|
# stable order in which flags need to be processed and their processors applied
|
|
|
REVIDX_FLAGS_ORDER = [
|
|
|
REVIDX_ISCENSORED,
|
|
|
REVIDX_ELLIPSIS,
|
|
|
REVIDX_EXTSTORED,
|
|
|
REVIDX_HASCOPIESINFO,
|
|
|
]
|
|
|
|
|
|
# bitmark for flags that could cause rawdata content change
|
|
|
REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
|
|
|
|
|
|
SUPPORTED_FLAGS = {
|
|
|
REVLOGV0: REVLOGV0_FLAGS,
|
|
|
REVLOGV1: REVLOGV1_FLAGS,
|
|
|
REVLOGV2: REVLOGV2_FLAGS,
|
|
|
}
|
|
|
|
|
|
SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000
|
|
|
|
