annotate mercurial/repoview.py @ 40163:9f0ee4a60d65

tests: ensure the python 3 passing test list stays sorted Differential Revision: https://phab.mercurial-scm.org/D4984
author Augie Fackler <augie@google.com>
date Fri, 12 Oct 2018 06:39:32 -0400
parents 06c976acc581
children bc15e37ecc16
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1 # repoview.py - Filtered view of a localrepo object
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2 #
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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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
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9 from __future__ import absolute_import
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10
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11 import copy
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12 import weakref
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13
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14 from .node import nullrev
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15 from . import (
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16 obsolete,
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17 phases,
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18 pycompat,
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19 tags as tagsmod,
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20 )
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21
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22 def hideablerevs(repo):
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23 """Revision candidates to be hidden
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24
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25 This is a standalone function to allow extensions to wrap it.
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26
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27 Because we use the set of immutable changesets as a fallback subset in
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28 branchmap (see mercurial.branchmap.subsettable), you cannot set "public"
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29 changesets as "hideable". Doing so would break multiple code assertions and
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30 lead to crashes."""
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31 obsoletes = obsolete.getrevs(repo, 'obsolete')
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32 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases)
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33 internals = frozenset(internals)
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34 return obsoletes | internals
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35
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36 def pinnedrevs(repo):
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37 """revisions blocking hidden changesets from being filtered
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38 """
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39
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40 cl = repo.changelog
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41 pinned = set()
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42 pinned.update([par.rev() for par in repo[None].parents()])
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43 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()])
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44
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45 tags = {}
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46 tagsmod.readlocaltags(repo.ui, repo, tags, {})
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47 if tags:
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48 rev, nodemap = cl.rev, cl.nodemap
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49 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap)
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50 return pinned
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51
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52
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53 def _revealancestors(pfunc, hidden, revs):
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54 """reveals contiguous chains of hidden ancestors of 'revs' by removing them
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55 from 'hidden'
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56
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57 - pfunc(r): a funtion returning parent of 'r',
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58 - hidden: the (preliminary) hidden revisions, to be updated
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59 - revs: iterable of revnum,
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60
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61 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are
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62 *not* revealed)
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63 """
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64 stack = list(revs)
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65 while stack:
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66 for p in pfunc(stack.pop()):
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67 if p != nullrev and p in hidden:
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68 hidden.remove(p)
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69 stack.append(p)
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70
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71 def computehidden(repo, visibilityexceptions=None):
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72 """compute the set of hidden revision to filter
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73
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74 During most operation hidden should be filtered."""
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75 assert not repo.changelog.filteredrevs
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76
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77 hidden = hideablerevs(repo)
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78 if hidden:
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79 hidden = set(hidden - pinnedrevs(repo))
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80 if visibilityexceptions:
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81 hidden -= visibilityexceptions
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82 pfunc = repo.changelog.parentrevs
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83 mutable = repo._phasecache.getrevset(repo, phases.mutablephases)
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84
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85 visible = mutable - hidden
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86 _revealancestors(pfunc, hidden, visible)
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87 return frozenset(hidden)
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88
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89 def computeunserved(repo, visibilityexceptions=None):
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90 """compute the set of revision that should be filtered when used a server
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91
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92 Secret and hidden changeset should not pretend to be here."""
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93 assert not repo.changelog.filteredrevs
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94 # fast path in simple case to avoid impact of non optimised code
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95 hiddens = filterrevs(repo, 'visible')
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96 if phases.hassecret(repo):
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97 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases)
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98 return frozenset(hiddens | frozenset(secrets))
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99 else:
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100 return hiddens
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101
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102 def computemutable(repo, visibilityexceptions=None):
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103 assert not repo.changelog.filteredrevs
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104 # fast check to avoid revset call on huge repo
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105 if any(repo._phasecache.phaseroots[1:]):
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106 getphase = repo._phasecache.phase
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107 maymutable = filterrevs(repo, 'base')
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108 return frozenset(r for r in maymutable if getphase(repo, r))
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109 return frozenset()
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110
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111 def computeimpactable(repo, visibilityexceptions=None):
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112 """Everything impactable by mutable revision
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113
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114 The immutable filter still have some chance to get invalidated. This will
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115 happen when:
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116
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117 - you garbage collect hidden changeset,
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118 - public phase is moved backward,
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119 - something is changed in the filtering (this could be fixed)
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120
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121 This filter out any mutable changeset and any public changeset that may be
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122 impacted by something happening to a mutable revision.
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123
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124 This is achieved by filtered everything with a revision number egal or
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125 higher than the first mutable changeset is filtered."""
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126 assert not repo.changelog.filteredrevs
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127 cl = repo.changelog
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128 firstmutable = len(cl)
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129 for roots in repo._phasecache.phaseroots[1:]:
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130 if roots:
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131 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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132 # protect from nullrev root
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133 firstmutable = max(0, firstmutable)
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134 return frozenset(pycompat.xrange(firstmutable, len(cl)))
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135
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136 # function to compute filtered set
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137 #
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138 # When adding a new filter you MUST update the table at:
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139 # mercurial.branchmap.subsettable
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140 # Otherwise your filter will have to recompute all its branches cache
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141 # from scratch (very slow).
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142 filtertable = {'visible': computehidden,
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143 'visible-hidden': computehidden,
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144 'served': computeunserved,
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145 'immutable': computemutable,
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146 'base': computeimpactable}
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147
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148 def filterrevs(repo, filtername, visibilityexceptions=None):
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149 """returns set of filtered revision for this filter name
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150
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151 visibilityexceptions is a set of revs which must are exceptions for
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152 hidden-state and must be visible. They are dynamic and hence we should not
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153 cache it's result"""
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154 if filtername not in repo.filteredrevcache:
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155 func = filtertable[filtername]
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156 if visibilityexceptions:
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157 return func(repo.unfiltered, visibilityexceptions)
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158 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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159 return repo.filteredrevcache[filtername]
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160
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161 class repoview(object):
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162 """Provide a read/write view of a repo through a filtered changelog
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163
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164 This object is used to access a filtered version of a repository without
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165 altering the original repository object itself. We can not alter the
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166 original object for two main reasons:
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167 - It prevents the use of a repo with multiple filters at the same time. In
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168 particular when multiple threads are involved.
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169 - It makes scope of the filtering harder to control.
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170
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171 This object behaves very closely to the original repository. All attribute
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172 operations are done on the original repository:
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173 - An access to `repoview.someattr` actually returns `repo.someattr`,
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174 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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175 - A deletion of `repoview.someattr` actually drops `someattr`
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176 from `repo.__dict__`.
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177
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178 The only exception is the `changelog` property. It is overridden to return
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179 a (surface) copy of `repo.changelog` with some revisions filtered. The
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180 `filtername` attribute of the view control the revisions that need to be
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181 filtered. (the fact the changelog is copied is an implementation detail).
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182
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183 Unlike attributes, this object intercepts all method calls. This means that
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184 all methods are run on the `repoview` object with the filtered `changelog`
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185 property. For this purpose the simple `repoview` class must be mixed with
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186 the actual class of the repository. This ensures that the resulting
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187 `repoview` object have the very same methods than the repo object. This
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188 leads to the property below.
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189
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190 repoview.method() --> repo.__class__.method(repoview)
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191
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192 The inheritance has to be done dynamically because `repo` can be of any
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193 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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194 """
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195
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196 def __init__(self, repo, filtername, visibilityexceptions=None):
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197 object.__setattr__(self, r'_unfilteredrepo', repo)
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198 object.__setattr__(self, r'filtername', filtername)
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199 object.__setattr__(self, r'_clcachekey', None)
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200 object.__setattr__(self, r'_clcache', None)
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201 # revs which are exceptions and must not be hidden
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202 object.__setattr__(self, r'_visibilityexceptions',
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203 visibilityexceptions)
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204
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205 # not a propertycache on purpose we shall implement a proper cache later
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206 @property
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207 def changelog(self):
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208 """return a filtered version of the changeset
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209
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210 this changelog must not be used for writing"""
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211 # some cache may be implemented later
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212 unfi = self._unfilteredrepo
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213 unfichangelog = unfi.changelog
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214 # bypass call to changelog.method
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215 unfiindex = unfichangelog.index
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216 unfilen = len(unfiindex)
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217 unfinode = unfiindex[unfilen - 1][7]
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218
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219 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions)
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220 cl = self._clcache
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221 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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222 # if cl.index is not unfiindex, unfi.changelog would be
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223 # recreated, and our clcache refers to garbage object
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224 if (cl is not None and
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225 (cl.index is not unfiindex or newkey != self._clcachekey)):
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226 cl = None
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227 # could have been made None by the previous if
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228 if cl is None:
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229 cl = copy.copy(unfichangelog)
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230 cl.filteredrevs = revs
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231 object.__setattr__(self, r'_clcache', cl)
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232 object.__setattr__(self, r'_clcachekey', newkey)
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233 return cl
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234
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235 def unfiltered(self):
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236 """Return an unfiltered version of a repo"""
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237 return self._unfilteredrepo
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238
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239 def filtered(self, name, visibilityexceptions=None):
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240 """Return a filtered version of a repository"""
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241 if name == self.filtername and not visibilityexceptions:
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242 return self
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3ad582b2895c repoview: add visibilityexceptions as an optional argument to repo.filtered()
Pulkit Goyal <7895pulkit@gmail.com>
parents: 35249
diff changeset
243 return self.unfiltered().filtered(name, visibilityexceptions)
18100
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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244
35249
d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
diff changeset
245 def __repr__(self):
d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
diff changeset
246 return r'<%s:%s %r>' % (self.__class__.__name__,
d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
diff changeset
247 pycompat.sysstr(self.filtername),
d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
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248 self.unfiltered())
d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
diff changeset
249
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3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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250 # everything access are forwarded to the proxied repo
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
251 def __getattr__(self, attr):
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
252 return getattr(self._unfilteredrepo, attr)
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
253
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
254 def __setattr__(self, attr, value):
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
255 return setattr(self._unfilteredrepo, attr, value)
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
256
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
257 def __delattr__(self, attr):
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
258 return delattr(self._unfilteredrepo, attr)
35248
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
259
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
260 # Python <3.4 easily leaks types via __mro__. See
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
261 # https://bugs.python.org/issue17950. We cache dynamically created types
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
262 # so they won't be leaked on every invocation of repo.filtered().
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
263 _filteredrepotypes = weakref.WeakKeyDictionary()
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
264
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
265 def newtype(base):
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
266 """Create a new type with the repoview mixin and the given base class"""
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
267 if base not in _filteredrepotypes:
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
268 class filteredrepo(repoview, base):
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
269 pass
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
270 _filteredrepotypes[base] = filteredrepo
c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
diff changeset
271 return _filteredrepotypes[base]