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annotate mercurial/revlogutils/constants.py @ 45671:2d6aea053153

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copies: add a HASCOPIESINFO flag to highlight rev with useful data If some files changes that may impact copy tracing are detected, we set this flag. This helps the copy tracing algorithm to skip fetching possibly expensive data when unnecessary. Differential Revision: https://phab.mercurial-scm.org/D9139
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 01 Oct 2020 09:29:49 +0200
parents 2372284d9457
children 913485776542
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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 # Reminder: change the bounds check in revlog.__init__ when this is changed.
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19 REVLOGV2 = 0xDEAD
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20 # Shared across v1 and v2.
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21 FLAG_INLINE_DATA = 1 << 16
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22 # Only used by v1, implied by v2.
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23 FLAG_GENERALDELTA = 1 << 17
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24 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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25 REVLOG_DEFAULT_FORMAT = REVLOGV1
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26 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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27 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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28 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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29
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30 # revlog index flags
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31
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32 # For historical reasons, revlog's internal flags were exposed via the
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33 # wire protocol and are even exposed in parts of the storage APIs.
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34
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35 # revision has censor metadata, must be verified
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36 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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37 # revision hash does not match data (narrowhg)
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38 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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39 # revision data is stored externally
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40 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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41 # revision data contains extra metadata not part of the official digest
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42 REVIDX_SIDEDATA = repository.REVISION_FLAG_SIDEDATA
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43 # revision changes files in a way that could affect copy tracing.
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44 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
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45 REVIDX_DEFAULT_FLAGS = 0
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46 # stable order in which flags need to be processed and their processors applied
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47 REVIDX_FLAGS_ORDER = [
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48 REVIDX_ISCENSORED,
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49 REVIDX_ELLIPSIS,
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50 REVIDX_EXTSTORED,
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51 REVIDX_SIDEDATA,
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52 REVIDX_HASCOPIESINFO,
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53 ]
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54
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55 # bitmark for flags that could cause rawdata content change
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56 REVIDX_RAWTEXT_CHANGING_FLAGS = (
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57 REVIDX_ISCENSORED | REVIDX_EXTSTORED | REVIDX_SIDEDATA
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58 )
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59
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60 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000