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

snapshot: consider all snapshots in the parents' chains...

snapshot: consider all snapshots in the parents' chains There are no reasons to only consider full snapshot as a possible base for an intermediate snapshot. Now that the basic principles have been set, we can start adding more levels of snapshots. We now consider all snapshots in the parent's chains (full or intermediate). This creates a chain of intermediate snapshots, each smaller than the previous one. # Effect On The Test Repository In the test repository, we can see a decrease in the revlog size and slightly shorter delta chain. However, that approach creates snapshots more frequently, increasing the risk of ending into problematic cases in very branchy repositories (not triggered by the test repository). The next changesets will remove that risk by adding logic that increases deltas reuse.

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        Boris Feld
    
revlog: split constants into a new `revlogutils.constants` module...

              r39365
            
      # 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 (

          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

      REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified

      REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)

      REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally

      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

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Boris Feld revlog: split constants into a new `revlogutils.constants` module...	r39365	# 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 (
		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
		REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
		REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)
		REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally
		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