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annotate mercurial/revlogutils/constants.py @ 41202:e7a2cc84dbc0

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revlog: always enable generaldelta on version 2 revlogs This commit starts the process of diverging version 2 revlogs from version 1 revlogs. generaldelta is a useful feature and has been enabled by default for ages. I can't think of a good reason why the feature should be disabled. Yes, it is true changelogs today don't have generaldelta enabled. But that's because they don't have delta chains enabled, so generaldelta makes no sense there. This commit makes generaldelta always enabled on version 2 revlogs. As part of this, one-off code in changelog.py mucking with revlog.version had to be made conditional on the revlog version, as we don't want to change revlog feature flags on version 2 revlogs. The fact this code exists is horrible and stems from revlog options being shared by the opener. We probably want a better API here. But that can wait for another patch. Differential Revision: https://phab.mercurial-scm.org/D5561
author Gregory Szorc <gregory.szorc@gmail.com>
date Wed, 09 Jan 2019 17:41:36 -0800
parents 8e398628a3f2
children 92ac6b1697a7
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1 # revlogdeltas.py - constant used for revlog logic
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 # Copyright 2018 Octobus <contact@octobus.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8 """Helper class to compute deltas stored inside revlogs"""
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9
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10 from __future__ import absolute_import
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11
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12 from .. import (
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13 repository,
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14 util,
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15 )
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17 # revlog header flags
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18 REVLOGV0 = 0
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19 REVLOGV1 = 1
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20 # Dummy value until file format is finalized.
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21 # Reminder: change the bounds check in revlog.__init__ when this is changed.
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22 REVLOGV2 = 0xDEAD
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23 # Shared across v1 and v2.
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24 FLAG_INLINE_DATA = (1 << 16)
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25 # Only used by v1, implied by v2.
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26 FLAG_GENERALDELTA = (1 << 17)
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27 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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28 REVLOG_DEFAULT_FORMAT = REVLOGV1
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29 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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30 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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31 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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32
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33 # revlog index flags
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34
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35 # For historical reasons, revlog's internal flags were exposed via the
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36 # wire protocol and are even exposed in parts of the storage APIs.
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37
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38 # revision has censor metadata, must be verified
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39 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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40 # revision hash does not match data (narrowhg)
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41 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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42 # revision data is stored externally
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43 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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44 REVIDX_DEFAULT_FLAGS = 0
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45 # stable order in which flags need to be processed and their processors applied
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46 REVIDX_FLAGS_ORDER = [
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47 REVIDX_ISCENSORED,
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48 REVIDX_ELLIPSIS,
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49 REVIDX_EXTSTORED,
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50 ]
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51 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
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52 # bitmark for flags that could cause rawdata content change
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53 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
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55 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000
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