upstream/mercurial-mirror Files · mercurial/revlogutils/constants.py

wireprotov2: implement command for retrieving raw store files...

wireprotov2: implement command for retrieving raw store files Implementing shallow clone of the changelog is hard. We want the 4.8 release to have a fast implementation of partial clone in wireprotov2. In order to achieve fast, we can't use deltas for transferring changelog and manifestlog data. Per discussions at the 4.8 sprint, this commit implements a somwwhat hacky and likely-to-be-changed-drastically-or-dropped command in wireprotov2 that facilitates access to raw store files, namely the changelog and manifestlog. Using this command, clients can perform a "stream clone" of sorts for just the changelog and manifestlog. This will allow clients to fetch the changelog and manifest revlogs, stream them to disk (which should be fast), then follow up filesdata requests for files revision data for a particular changeset. Differential Revision: https://phab.mercurial-scm.org/D5134

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      # revlogdeltas.py - constant used for revlog logic

      #

      # Copyright 2005-2007 Matt Mackall <mpm@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

      from .. import (

          repository,

          util,

      )

      # revlog header flags

      REVLOGV0 = 0

      REVLOGV1 = 1

      # Dummy value until file format is finalized.

      # Reminder: change the bounds check in revlog.__init__ when this is changed.

      REVLOGV2 = 0xDEAD

      FLAG_INLINE_DATA = (1 << 16)

      FLAG_GENERALDELTA = (1 << 17)

      REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA

      REVLOG_DEFAULT_FORMAT = REVLOGV1

      REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS

      REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA

      REVLOGV2_FLAGS = REVLOGV1_FLAGS

      # 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

      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_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)

      # bitmark for flags that could cause rawdata content change

      REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED

      SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000

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				# revlogdeltas.py - constant used for revlog logic
				#
				# Copyright 2005-2007 Matt Mackall <mpm@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

				from .. import (
				repository,
				util,
				)

				# revlog header flags
				REVLOGV0 = 0
				REVLOGV1 = 1
				# Dummy value until file format is finalized.
				# Reminder: change the bounds check in revlog.__init__ when this is changed.
				REVLOGV2 = 0xDEAD
				FLAG_INLINE_DATA = (1 << 16)
				FLAG_GENERALDELTA = (1 << 17)
				REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
				REVLOG_DEFAULT_FORMAT = REVLOGV1
				REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT \| REVLOG_DEFAULT_FLAGS
				REVLOGV1_FLAGS = FLAG_INLINE_DATA \| FLAG_GENERALDELTA
				REVLOGV2_FLAGS = REVLOGV1_FLAGS

				# 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
				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_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
				# bitmark for flags that could cause rawdata content change
				REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED \| REVIDX_EXTSTORED

				SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000