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annotate mercurial/requirements.py @ 48667:ff0233f36f6a

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test-bundle: split some variant in there own section Same rational as the previous commit about test-bundle.t. These line are quite volatile and having dedicated block will make their update clearer and simpler. Differential Revision: https://phab.mercurial-scm.org/D12076
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 24 Jan 2022 12:58:18 +0100
parents 66b59fbb0cdd
children 6fd9a17c32ab
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1 # requirements.py - objects and functions related to repository requirements
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2 #
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3 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 # obsolete experimental requirements:
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11 # - manifestv2: An experimental new manifest format that allowed
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12 # for stem compression of long paths. Experiment ended up not
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13 # being successful (repository sizes went up due to worse delta
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14 # chains), and the code was deleted in 4.6.
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15
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16 GENERALDELTA_REQUIREMENT = b'generaldelta'
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17 DOTENCODE_REQUIREMENT = b'dotencode'
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18 STORE_REQUIREMENT = b'store'
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19 FNCACHE_REQUIREMENT = b'fncache'
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20
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21 DIRSTATE_V2_REQUIREMENT = b'dirstate-v2'
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22
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23 # When narrowing is finalized and no longer subject to format changes,
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24 # we should move this to just "narrow" or similar.
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25 NARROW_REQUIREMENT = b'narrowhg-experimental'
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26
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27 # Enables sparse working directory usage
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28 SPARSE_REQUIREMENT = b'exp-sparse'
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29
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30 # Enables the internal phase which is used to hide changesets instead
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31 # of stripping them
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32 INTERNAL_PHASE_REQUIREMENT = b'internal-phase'
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33
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34 # Stores manifest in Tree structure
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35 TREEMANIFEST_REQUIREMENT = b'treemanifest'
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36
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37 REVLOGV1_REQUIREMENT = b'revlogv1'
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38
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39 # Increment the sub-version when the revlog v2 format changes to lock out old
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40 # clients.
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41 CHANGELOGV2_REQUIREMENT = b'exp-changelog-v2'
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42
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43 # Increment the sub-version when the revlog v2 format changes to lock out old
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44 # clients.
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45 REVLOGV2_REQUIREMENT = b'exp-revlogv2.2'
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46
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47 # A repository with the sparserevlog feature will have delta chains that
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48 # can spread over a larger span. Sparse reading cuts these large spans into
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49 # pieces, so that each piece isn't too big.
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50 # Without the sparserevlog capability, reading from the repository could use
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51 # huge amounts of memory, because the whole span would be read at once,
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52 # including all the intermediate revisions that aren't pertinent for the chain.
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53 # This is why once a repository has enabled sparse-read, it becomes required.
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54 SPARSEREVLOG_REQUIREMENT = b'sparserevlog'
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55
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56 # A repository with the the copies-sidedata-changeset requirement will store
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57 # copies related information in changeset's sidedata.
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58 COPIESSDC_REQUIREMENT = b'exp-copies-sidedata-changeset'
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59
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60 # The repository use persistent nodemap for the changelog and the manifest.
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61 NODEMAP_REQUIREMENT = b'persistent-nodemap'
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62
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63 # Denotes that the current repository is a share
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64 SHARED_REQUIREMENT = b'shared'
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65
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66 # Denotes that current repository is a share and the shared source path is
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67 # relative to the current repository root path
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68 RELATIVE_SHARED_REQUIREMENT = b'relshared'
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69
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70 # A repository with share implemented safely. The repository has different
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71 # store and working copy requirements i.e. both `.hg/requires` and
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72 # `.hg/store/requires` are present.
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73 SHARESAFE_REQUIREMENT = b'share-safe'
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74
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75 # Bookmarks must be stored in the `store` part of the repository and will be
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76 # share accross shares
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77 BOOKMARKS_IN_STORE_REQUIREMENT = b'bookmarksinstore'
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78
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79 # List of requirements which are working directory specific
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80 # These requirements cannot be shared between repositories if they
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81 # share the same store
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82 # * sparse is a working directory specific functionality and hence working
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83 # directory specific requirement
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84 # * SHARED_REQUIREMENT and RELATIVE_SHARED_REQUIREMENT are requirements which
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85 # represents that the current working copy/repository shares store of another
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86 # repo. Hence both of them should be stored in working copy
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87 # * SHARESAFE_REQUIREMENT needs to be stored in working dir to mark that rest of
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88 # the requirements are stored in store's requires
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89 # * DIRSTATE_V2_REQUIREMENT affects .hg/dirstate, of which there is one per
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90 # working directory.
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91 WORKING_DIR_REQUIREMENTS = {
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92 SPARSE_REQUIREMENT,
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93 SHARED_REQUIREMENT,
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94 RELATIVE_SHARED_REQUIREMENT,
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95 SHARESAFE_REQUIREMENT,
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96 DIRSTATE_V2_REQUIREMENT,
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97 }
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98
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99 # List of requirement that impact "stream-clone" (and hardlink clone) and
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100 # cannot be changed in such cases.
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101 #
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102 # requirements not in this list are safe to be altered during stream-clone.
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103 #
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104 # note: the list is currently inherited from previous code and miss some relevant requirement while containing some irrelevant ones.
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105 STREAM_FIXED_REQUIREMENTS = {
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106 BOOKMARKS_IN_STORE_REQUIREMENT,
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107 CHANGELOGV2_REQUIREMENT,
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108 COPIESSDC_REQUIREMENT,
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109 DIRSTATE_V2_REQUIREMENT,
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110 GENERALDELTA_REQUIREMENT,
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111 NODEMAP_REQUIREMENT,
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112 REVLOGV1_REQUIREMENT,
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113 REVLOGV2_REQUIREMENT,
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114 SHARESAFE_REQUIREMENT,
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115 SPARSEREVLOG_REQUIREMENT,
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116 TREEMANIFEST_REQUIREMENT,
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117 }