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annotate mercurial/revlogutils/constants.py @ 46704:913485776542

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revlog: introduce v2 format As documented in [1], this is still tentative and could be subject to change, but we need to lay down the foundations in order to work on the next abstraction layers. [1] https://www.mercurial-scm.org/wiki/RevlogV2Plan Differential Revision: https://phab.mercurial-scm.org/D9843
author Raphaël Gomès <rgomes@octobus.net>
date Thu, 28 Jan 2021 15:28:57 +0100
parents 2d6aea053153
children d4ba4d51f85f
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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 ..interfaces import repository
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13
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14 # revlog header flags
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15 REVLOGV0 = 0
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16 REVLOGV1 = 1
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17 # Dummy value until file format is finalized.
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18 REVLOGV2 = 0xDEAD
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19 # Shared across v1 and v2.
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20 FLAG_INLINE_DATA = 1 << 16
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21 # Only used by v1, implied by v2.
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22 FLAG_GENERALDELTA = 1 << 17
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23 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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24 REVLOG_DEFAULT_FORMAT = REVLOGV1
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25 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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26 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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27 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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28
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29 # revlog index flags
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30
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31 # For historical reasons, revlog's internal flags were exposed via the
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32 # wire protocol and are even exposed in parts of the storage APIs.
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33
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34 # revision has censor metadata, must be verified
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35 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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36 # revision hash does not match data (narrowhg)
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37 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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38 # revision data is stored externally
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39 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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40 # revision data contains extra metadata not part of the official digest
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41 REVIDX_SIDEDATA = repository.REVISION_FLAG_SIDEDATA
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42 # revision changes files in a way that could affect copy tracing.
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43 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
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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 REVIDX_SIDEDATA,
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51 REVIDX_HASCOPIESINFO,
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52 ]
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53
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54 # bitmark for flags that could cause rawdata content change
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55 REVIDX_RAWTEXT_CHANGING_FLAGS = (
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56 REVIDX_ISCENSORED | REVIDX_EXTSTORED | REVIDX_SIDEDATA
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57 )
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58
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59 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000