Mercurial > hg
annotate mercurial/revlogutils/constants.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
parents | c6e23fb4bfb4 |
children | 119790e1c67c |
rev | line source |
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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 data contains extra metadata not part of the official digest |
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103 REVIDX_SIDEDATA = repository.REVISION_FLAG_SIDEDATA |
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104 # revision changes files in a way that could affect copy tracing. |
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105 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO |
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106 REVIDX_DEFAULT_FLAGS = 0 |
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107 # stable order in which flags need to be processed and their processors applied |
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108 REVIDX_FLAGS_ORDER = [ |
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109 REVIDX_ISCENSORED, |
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110 REVIDX_ELLIPSIS, |
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111 REVIDX_EXTSTORED, |
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112 REVIDX_SIDEDATA, |
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113 REVIDX_HASCOPIESINFO, |
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114 ] |
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115 |
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116 # bitmark for flags that could cause rawdata content change |
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117 REVIDX_RAWTEXT_CHANGING_FLAGS = ( |
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118 REVIDX_ISCENSORED | REVIDX_EXTSTORED | REVIDX_SIDEDATA |
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119 ) |
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120 |
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121 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000 |