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annotate mercurial/revlogutils/constants.py @ 43763:3fd6ec54704c

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locarepo: also fastpath `nullid` lookup in __getitem__ We already use that fastpath for `"null"` and `nullrev`, using it for `nullid` is similar. Differential Revision: https://phab.mercurial-scm.org/D7486
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sat, 23 Nov 2019 16:49:34 -0800
parents 2372284d9457
children 2d6aea053153
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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 REVIDX_DEFAULT_FLAGS = 0
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44 # stable order in which flags need to be processed and their processors applied
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45 REVIDX_FLAGS_ORDER = [
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46 REVIDX_ISCENSORED,
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47 REVIDX_ELLIPSIS,
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48 REVIDX_EXTSTORED,
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49 REVIDX_SIDEDATA,
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50 ]
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51
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52 # bitmark for flags that could cause rawdata content change
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53 REVIDX_RAWTEXT_CHANGING_FLAGS = (
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54 REVIDX_ISCENSORED | REVIDX_EXTSTORED | REVIDX_SIDEDATA
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55 )
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56
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57 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000