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annotate mercurial/revlogutils/constants.py @ 47094:119790e1c67c

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cg4: introduce protocol flag to signify the presence of sidedata We need a way of signaling whether the current revision has sidedata or not, and re-using the revision flags would waste potential revlog flags and mix two normally independent layers. In this change, we add a single byte at the start of the ch4 delta header to set potential protocol flags. We also reclaim the revlog flag for sidedata, since it is no longer used, in its place now lives the (also experimental) copytracing flag. When generating deltas, apply the `CG_FLAG_SIDEDATA` flag if there is sidedata. When applying the deltas, if said flag is present, the next chunk contains the sidedata. Differential Revision: https://phab.mercurial-scm.org/D10343
author Rapha?l Gom?s <rgomes@octobus.net>
date Sat, 10 Apr 2021 11:27:40 +0200
parents 4c041c71ec01
children 0e9105bf54cb
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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 Olivia Mackall <olivia@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 import struct
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13
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14 from ..interfaces import repository
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15
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16 ### Internal utily constants
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17
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18 KIND_CHANGELOG = 1001 # over 256 to not be comparable with a bytes
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19 KIND_MANIFESTLOG = 1002
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20 KIND_FILELOG = 1003
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21 KIND_OTHER = 1004
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22
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23 ALL_KINDS = {
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24 KIND_CHANGELOG,
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25 KIND_MANIFESTLOG,
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26 KIND_FILELOG,
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27 KIND_OTHER,
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28 }
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29
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30 ### main revlog header
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31
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32 INDEX_HEADER = struct.Struct(b">I")
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33
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34 ## revlog version
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35 REVLOGV0 = 0
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36 REVLOGV1 = 1
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37 # Dummy value until file format is finalized.
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38 REVLOGV2 = 0xDEAD
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39
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40 ## global revlog header flags
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41 # Shared across v1 and v2.
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42 FLAG_INLINE_DATA = 1 << 16
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43 # Only used by v1, implied by v2.
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44 FLAG_GENERALDELTA = 1 << 17
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45 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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46 REVLOG_DEFAULT_FORMAT = REVLOGV1
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47 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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48 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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49 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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50
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51 ### individual entry
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52
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53 ## index v0:
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54 # 4 bytes: offset
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55 # 4 bytes: compressed length
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56 # 4 bytes: base rev
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57 # 4 bytes: link rev
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58 # 20 bytes: parent 1 nodeid
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59 # 20 bytes: parent 2 nodeid
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60 # 20 bytes: nodeid
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61 INDEX_ENTRY_V0 = struct.Struct(b">4l20s20s20s")
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62
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63 ## index v1
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64 # 6 bytes: offset
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65 # 2 bytes: flags
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66 # 4 bytes: compressed length
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67 # 4 bytes: uncompressed length
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68 # 4 bytes: base rev
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69 # 4 bytes: link rev
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70 # 4 bytes: parent 1 rev
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71 # 4 bytes: parent 2 rev
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72 # 32 bytes: nodeid
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73 INDEX_ENTRY_V1 = struct.Struct(b">Qiiiiii20s12x")
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74 assert INDEX_ENTRY_V1.size == 32 * 2
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75
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76 # 6 bytes: offset
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77 # 2 bytes: flags
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78 # 4 bytes: compressed length
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79 # 4 bytes: uncompressed length
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80 # 4 bytes: base rev
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81 # 4 bytes: link rev
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82 # 4 bytes: parent 1 rev
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83 # 4 bytes: parent 2 rev
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84 # 32 bytes: nodeid
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85 # 8 bytes: sidedata offset
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86 # 4 bytes: sidedata compressed length
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87 # 20 bytes: Padding to align to 96 bytes (see RevlogV2Plan wiki page)
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88 INDEX_ENTRY_V2 = struct.Struct(b">Qiiiiii20s12xQi20x")
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89 assert INDEX_ENTRY_V2.size == 32 * 3
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90
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91 # revlog index flags
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92
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93 # For historical reasons, revlog's internal flags were exposed via the
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94 # wire protocol and are even exposed in parts of the storage APIs.
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95
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96 # revision has censor metadata, must be verified
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97 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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98 # revision hash does not match data (narrowhg)
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99 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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100 # revision data is stored externally
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101 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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102 # revision changes files in a way that could affect copy tracing.
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103 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
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104 REVIDX_DEFAULT_FLAGS = 0
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105 # stable order in which flags need to be processed and their processors applied
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106 REVIDX_FLAGS_ORDER = [
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107 REVIDX_ISCENSORED,
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108 REVIDX_ELLIPSIS,
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109 REVIDX_EXTSTORED,
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110 REVIDX_HASCOPIESINFO,
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111 ]
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112
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113 # bitmark for flags that could cause rawdata content change
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119790e1c67c cg4: introduce protocol flag to signify the presence of sidedata
Rapha?l Gom?s <rgomes@octobus.net>
parents: 47089
diff changeset
114 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
39523
b66ea3fc3a86 sparse-revlog: set max delta chain length to on thousand
Boris Feld <boris.feld@octobus.net>
parents: 39357
diff changeset
115
b66ea3fc3a86 sparse-revlog: set max delta chain length to on thousand
Boris Feld <boris.feld@octobus.net>
parents: 39357
diff changeset
116 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000