Mercurial > hg
annotate mercurial/repoview.py @ 46858:85e3a630cad9
revlog: move the details of revlog "v2" index inside revlog.utils.constants
the revlog module is quite large and this kind of format information would handy
for other module. So let us start to gather this information about the format in
a more appropriate place.
We update various reference to this information to use the new "source of truth"
in the process.
Differential Revision: https://phab.mercurial-scm.org/D10305
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 05 Apr 2021 12:21:12 +0200 |
parents | d6a9e690d620 |
children | 42eb8b7881b8 |
rev | line source |
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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 .i18n import _ |
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15 from .node import ( |
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16 hex, |
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17 nullrev, |
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18 ) |
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19 from .pycompat import ( |
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20 delattr, |
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21 getattr, |
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22 setattr, |
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23 ) |
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24 from . import ( |
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25 error, |
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26 obsolete, |
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27 phases, |
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28 pycompat, |
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29 tags as tagsmod, |
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30 util, |
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31 ) |
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32 from .utils import repoviewutil |
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33 |
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34 |
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35 def hideablerevs(repo): |
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36 """Revision candidates to be hidden |
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37 |
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38 This is a standalone function to allow extensions to wrap it. |
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39 |
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40 Because we use the set of immutable changesets as a fallback subset in |
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41 branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set |
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42 "public" changesets as "hideable". Doing so would break multiple code |
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43 assertions and lead to crashes.""" |
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44 obsoletes = obsolete.getrevs(repo, b'obsolete') |
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45 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) |
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46 internals = frozenset(internals) |
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47 return obsoletes | internals |
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48 |
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49 |
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50 def pinnedrevs(repo): |
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51 """revisions blocking hidden changesets from being filtered""" |
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52 |
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53 cl = repo.changelog |
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54 pinned = set() |
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55 pinned.update([par.rev() for par in repo[None].parents()]) |
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56 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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57 |
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58 tags = {} |
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59 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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60 if tags: |
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61 rev = cl.index.get_rev |
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62 pinned.update(rev(t[0]) for t in tags.values()) |
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63 pinned.discard(None) |
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64 |
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65 # Avoid cycle: mercurial.filemerge -> mercurial.templater -> |
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66 # mercurial.templatefuncs -> mercurial.revset -> mercurial.repoview -> |
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67 # mercurial.mergestate -> mercurial.filemerge |
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68 from . import mergestate |
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69 |
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70 ms = mergestate.mergestate.read(repo) |
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71 if ms.active() and ms.unresolvedcount(): |
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72 for node in (ms.local, ms.other): |
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73 rev = cl.index.get_rev(node) |
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74 if rev is not None: |
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75 pinned.add(rev) |
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76 |
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77 return pinned |
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78 |
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79 |
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80 def _revealancestors(pfunc, hidden, revs): |
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81 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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82 from 'hidden' |
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83 |
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84 - pfunc(r): a funtion returning parent of 'r', |
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85 - hidden: the (preliminary) hidden revisions, to be updated |
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86 - revs: iterable of revnum, |
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87 |
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88 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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89 *not* revealed) |
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90 """ |
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91 stack = list(revs) |
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92 while stack: |
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93 for p in pfunc(stack.pop()): |
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94 if p != nullrev and p in hidden: |
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95 hidden.remove(p) |
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96 stack.append(p) |
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97 |
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98 |
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99 def computehidden(repo, visibilityexceptions=None): |
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100 """compute the set of hidden revision to filter |
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101 |
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102 During most operation hidden should be filtered.""" |
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103 assert not repo.changelog.filteredrevs |
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104 |
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105 hidden = hideablerevs(repo) |
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106 if hidden: |
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107 hidden = set(hidden - pinnedrevs(repo)) |
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108 if visibilityexceptions: |
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109 hidden -= visibilityexceptions |
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110 pfunc = repo.changelog.parentrevs |
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111 mutable = repo._phasecache.getrevset(repo, phases.mutablephases) |
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112 |
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113 visible = mutable - hidden |
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114 _revealancestors(pfunc, hidden, visible) |
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115 return frozenset(hidden) |
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116 |
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117 |
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118 def computesecret(repo, visibilityexceptions=None): |
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119 """compute the set of revision that can never be exposed through hgweb |
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120 |
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121 Changeset in the secret phase (or above) should stay unaccessible.""" |
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122 assert not repo.changelog.filteredrevs |
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123 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) |
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124 return frozenset(secrets) |
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125 |
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126 |
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127 def computeunserved(repo, visibilityexceptions=None): |
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128 """compute the set of revision that should be filtered when used a server |
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129 |
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130 Secret and hidden changeset should not pretend to be here.""" |
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131 assert not repo.changelog.filteredrevs |
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132 # fast path in simple case to avoid impact of non optimised code |
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133 hiddens = filterrevs(repo, b'visible') |
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134 secrets = filterrevs(repo, b'served.hidden') |
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135 if secrets: |
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136 return frozenset(hiddens | secrets) |
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137 else: |
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138 return hiddens |
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139 |
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140 |
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141 def computemutable(repo, visibilityexceptions=None): |
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142 assert not repo.changelog.filteredrevs |
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143 # fast check to avoid revset call on huge repo |
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144 if repo._phasecache.hasnonpublicphases(repo): |
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145 return frozenset(repo._phasecache.getrevset(repo, phases.mutablephases)) |
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146 return frozenset() |
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147 |
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148 |
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149 def computeimpactable(repo, visibilityexceptions=None): |
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150 """Everything impactable by mutable revision |
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151 |
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152 The immutable filter still have some chance to get invalidated. This will |
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153 happen when: |
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154 |
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155 - you garbage collect hidden changeset, |
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156 - public phase is moved backward, |
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157 - something is changed in the filtering (this could be fixed) |
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158 |
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159 This filter out any mutable changeset and any public changeset that may be |
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160 impacted by something happening to a mutable revision. |
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161 |
46195 | 162 This is achieved by filtered everything with a revision number equal or |
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163 higher than the first mutable changeset is filtered.""" |
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164 assert not repo.changelog.filteredrevs |
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165 cl = repo.changelog |
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166 firstmutable = len(cl) |
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167 roots = repo._phasecache.nonpublicphaseroots(repo) |
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168 if roots: |
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169 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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170 # protect from nullrev root |
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171 firstmutable = max(0, firstmutable) |
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172 return frozenset(pycompat.xrange(firstmutable, len(cl))) |
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173 |
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174 |
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175 # function to compute filtered set |
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176 # |
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177 # When adding a new filter you MUST update the table at: |
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178 # mercurial.utils.repoviewutil.subsettable |
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179 # Otherwise your filter will have to recompute all its branches cache |
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180 # from scratch (very slow). |
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181 filtertable = { |
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182 b'visible': computehidden, |
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183 b'visible-hidden': computehidden, |
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184 b'served.hidden': computesecret, |
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185 b'served': computeunserved, |
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186 b'immutable': computemutable, |
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187 b'base': computeimpactable, |
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188 } |
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189 |
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190 # set of filter level that will include the working copy parent no matter what. |
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191 filter_has_wc = {b'visible', b'visible-hidden'} |
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192 |
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193 _basefiltername = list(filtertable) |
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194 |
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195 |
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196 def extrafilter(ui): |
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197 """initialize extra filter and return its id |
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198 |
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199 If extra filtering is configured, we make sure the associated filtered view |
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200 are declared and return the associated id. |
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201 """ |
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202 frevs = ui.config(b'experimental', b'extra-filter-revs') |
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203 if frevs is None: |
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204 return None |
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205 |
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206 fid = pycompat.sysbytes(util.DIGESTS[b'sha1'](frevs).hexdigest())[:12] |
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207 |
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208 combine = lambda fname: fname + b'%' + fid |
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209 |
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210 subsettable = repoviewutil.subsettable |
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211 |
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212 if combine(b'base') not in filtertable: |
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213 for name in _basefiltername: |
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214 |
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215 def extrafilteredrevs(repo, *args, **kwargs): |
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216 baserevs = filtertable[name](repo, *args, **kwargs) |
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217 extrarevs = frozenset(repo.revs(frevs)) |
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218 return baserevs | extrarevs |
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219 |
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220 filtertable[combine(name)] = extrafilteredrevs |
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221 if name in subsettable: |
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222 subsettable[combine(name)] = combine(subsettable[name]) |
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223 return fid |
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224 |
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225 |
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226 def filterrevs(repo, filtername, visibilityexceptions=None): |
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227 """returns set of filtered revision for this filter name |
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228 |
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229 visibilityexceptions is a set of revs which must are exceptions for |
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230 hidden-state and must be visible. They are dynamic and hence we should not |
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231 cache it's result""" |
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232 if filtername not in repo.filteredrevcache: |
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233 if repo.ui.configbool(b'devel', b'debug.repo-filters'): |
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234 msg = b'computing revision filter for "%s"' |
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235 msg %= filtername |
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236 if repo.ui.tracebackflag and repo.ui.debugflag: |
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237 # XXX use ui.write_err |
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238 util.debugstacktrace( |
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239 msg, |
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240 f=repo.ui._fout, |
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241 otherf=repo.ui._ferr, |
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242 prefix=b'debug.filters: ', |
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243 ) |
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244 else: |
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245 repo.ui.debug(b'debug.filters: %s\n' % msg) |
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246 func = filtertable[filtername] |
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247 if visibilityexceptions: |
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248 return func(repo.unfiltered, visibilityexceptions) |
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249 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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250 return repo.filteredrevcache[filtername] |
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251 |
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252 |
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253 def wrapchangelog(unfichangelog, filteredrevs): |
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254 cl = copy.copy(unfichangelog) |
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255 cl.filteredrevs = filteredrevs |
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256 |
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257 class filteredchangelog(filteredchangelogmixin, cl.__class__): |
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258 pass |
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259 |
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260 cl.__class__ = filteredchangelog |
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261 |
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262 return cl |
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263 |
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264 |
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265 class filteredchangelogmixin(object): |
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266 def tiprev(self): |
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267 """filtered version of revlog.tiprev""" |
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268 for i in pycompat.xrange(len(self) - 1, -2, -1): |
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269 if i not in self.filteredrevs: |
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270 return i |
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271 |
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272 def __contains__(self, rev): |
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273 """filtered version of revlog.__contains__""" |
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274 return 0 <= rev < len(self) and rev not in self.filteredrevs |
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275 |
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276 def __iter__(self): |
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277 """filtered version of revlog.__iter__""" |
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278 |
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279 def filterediter(): |
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280 for i in pycompat.xrange(len(self)): |
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281 if i not in self.filteredrevs: |
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282 yield i |
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283 |
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284 return filterediter() |
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285 |
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286 def revs(self, start=0, stop=None): |
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287 """filtered version of revlog.revs""" |
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288 for i in super(filteredchangelogmixin, self).revs(start, stop): |
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289 if i not in self.filteredrevs: |
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290 yield i |
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291 |
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292 def _checknofilteredinrevs(self, revs): |
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293 """raise the appropriate error if 'revs' contains a filtered revision |
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294 |
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295 This returns a version of 'revs' to be used thereafter by the caller. |
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296 In particular, if revs is an iterator, it is converted into a set. |
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297 """ |
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298 safehasattr = util.safehasattr |
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299 if safehasattr(revs, '__next__'): |
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300 # Note that inspect.isgenerator() is not true for iterators, |
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301 revs = set(revs) |
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302 |
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303 filteredrevs = self.filteredrevs |
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304 if safehasattr(revs, 'first'): # smartset |
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305 offenders = revs & filteredrevs |
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306 else: |
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307 offenders = filteredrevs.intersection(revs) |
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308 |
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309 for rev in offenders: |
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310 raise error.FilteredIndexError(rev) |
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311 return revs |
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312 |
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313 def headrevs(self, revs=None): |
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314 if revs is None: |
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315 try: |
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316 return self.index.headrevsfiltered(self.filteredrevs) |
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317 # AttributeError covers non-c-extension environments and |
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318 # old c extensions without filter handling. |
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319 except AttributeError: |
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320 return self._headrevs() |
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321 |
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322 revs = self._checknofilteredinrevs(revs) |
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323 return super(filteredchangelogmixin, self).headrevs(revs) |
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324 |
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325 def strip(self, *args, **kwargs): |
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326 # XXX make something better than assert |
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327 # We can't expect proper strip behavior if we are filtered. |
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328 assert not self.filteredrevs |
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329 super(filteredchangelogmixin, self).strip(*args, **kwargs) |
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330 |
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331 def rev(self, node): |
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332 """filtered version of revlog.rev""" |
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333 r = super(filteredchangelogmixin, self).rev(node) |
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334 if r in self.filteredrevs: |
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335 raise error.FilteredLookupError( |
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336 hex(node), self.indexfile, _(b'filtered node') |
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337 ) |
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338 return r |
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339 |
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340 def node(self, rev): |
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341 """filtered version of revlog.node""" |
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342 if rev in self.filteredrevs: |
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343 raise error.FilteredIndexError(rev) |
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344 return super(filteredchangelogmixin, self).node(rev) |
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345 |
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346 def linkrev(self, rev): |
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347 """filtered version of revlog.linkrev""" |
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348 if rev in self.filteredrevs: |
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349 raise error.FilteredIndexError(rev) |
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350 return super(filteredchangelogmixin, self).linkrev(rev) |
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351 |
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352 def parentrevs(self, rev): |
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353 """filtered version of revlog.parentrevs""" |
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354 if rev in self.filteredrevs: |
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355 raise error.FilteredIndexError(rev) |
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356 return super(filteredchangelogmixin, self).parentrevs(rev) |
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357 |
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358 def flags(self, rev): |
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359 """filtered version of revlog.flags""" |
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360 if rev in self.filteredrevs: |
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361 raise error.FilteredIndexError(rev) |
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362 return super(filteredchangelogmixin, self).flags(rev) |
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363 |
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364 |
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365 class repoview(object): |
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366 """Provide a read/write view of a repo through a filtered changelog |
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367 |
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368 This object is used to access a filtered version of a repository without |
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369 altering the original repository object itself. We can not alter the |
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370 original object for two main reasons: |
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371 - It prevents the use of a repo with multiple filters at the same time. In |
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372 particular when multiple threads are involved. |
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373 - It makes scope of the filtering harder to control. |
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374 |
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375 This object behaves very closely to the original repository. All attribute |
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376 operations are done on the original repository: |
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377 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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378 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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379 - A deletion of `repoview.someattr` actually drops `someattr` |
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380 from `repo.__dict__`. |
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381 |
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382 The only exception is the `changelog` property. It is overridden to return |
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383 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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384 `filtername` attribute of the view control the revisions that need to be |
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385 filtered. (the fact the changelog is copied is an implementation detail). |
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386 |
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387 Unlike attributes, this object intercepts all method calls. This means that |
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388 all methods are run on the `repoview` object with the filtered `changelog` |
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389 property. For this purpose the simple `repoview` class must be mixed with |
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390 the actual class of the repository. This ensures that the resulting |
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391 `repoview` object have the very same methods than the repo object. This |
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392 leads to the property below. |
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393 |
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394 repoview.method() --> repo.__class__.method(repoview) |
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395 |
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396 The inheritance has to be done dynamically because `repo` can be of any |
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397 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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398 """ |
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399 |
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400 def __init__(self, repo, filtername, visibilityexceptions=None): |
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401 object.__setattr__(self, '_unfilteredrepo', repo) |
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402 object.__setattr__(self, 'filtername', filtername) |
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403 object.__setattr__(self, '_clcachekey', None) |
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404 object.__setattr__(self, '_clcache', None) |
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405 # revs which are exceptions and must not be hidden |
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406 object.__setattr__(self, '_visibilityexceptions', visibilityexceptions) |
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407 |
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408 # not a propertycache on purpose we shall implement a proper cache later |
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409 @property |
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410 def changelog(self): |
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411 """return a filtered version of the changeset |
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412 |
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413 this changelog must not be used for writing""" |
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414 # some cache may be implemented later |
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415 unfi = self._unfilteredrepo |
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416 unfichangelog = unfi.changelog |
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417 # bypass call to changelog.method |
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418 unfiindex = unfichangelog.index |
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419 unfilen = len(unfiindex) |
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420 unfinode = unfiindex[unfilen - 1][7] |
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421 with util.timedcm('repo filter for %s', self.filtername): |
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422 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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423 cl = self._clcache |
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424 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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425 # if cl.index is not unfiindex, unfi.changelog would be |
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426 # recreated, and our clcache refers to garbage object |
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427 if cl is not None and ( |
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428 cl.index is not unfiindex or newkey != self._clcachekey |
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429 ): |
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430 cl = None |
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431 # could have been made None by the previous if |
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432 if cl is None: |
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433 # Only filter if there's something to filter |
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434 cl = wrapchangelog(unfichangelog, revs) if revs else unfichangelog |
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435 object.__setattr__(self, '_clcache', cl) |
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436 object.__setattr__(self, '_clcachekey', newkey) |
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437 return cl |
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438 |
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439 def unfiltered(self): |
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440 """Return an unfiltered version of a repo""" |
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441 return self._unfilteredrepo |
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442 |
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443 def filtered(self, name, visibilityexceptions=None): |
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444 """Return a filtered version of a repository""" |
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445 if name == self.filtername and not visibilityexceptions: |
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446 return self |
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447 return self.unfiltered().filtered(name, visibilityexceptions) |
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448 |
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449 def __repr__(self): |
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450 return '<%s:%s %r>' % ( |
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451 self.__class__.__name__, |
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452 pycompat.sysstr(self.filtername), |
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453 self.unfiltered(), |
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454 ) |
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455 |
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456 # everything access are forwarded to the proxied repo |
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457 def __getattr__(self, attr): |
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458 return getattr(self._unfilteredrepo, attr) |
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459 |
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460 def __setattr__(self, attr, value): |
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461 return setattr(self._unfilteredrepo, attr, value) |
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462 |
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463 def __delattr__(self, attr): |
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464 return delattr(self._unfilteredrepo, attr) |
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465 |
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466 |
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467 # Python <3.4 easily leaks types via __mro__. See |
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468 # https://bugs.python.org/issue17950. We cache dynamically created types |
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469 # so they won't be leaked on every invocation of repo.filtered(). |
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470 _filteredrepotypes = weakref.WeakKeyDictionary() |
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471 |
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472 |
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473 def newtype(base): |
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474 """Create a new type with the repoview mixin and the given base class""" |
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475 if base not in _filteredrepotypes: |
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476 |
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477 class filteredrepo(repoview, base): |
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478 pass |
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479 |
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480 _filteredrepotypes[base] = filteredrepo |
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481 return _filteredrepotypes[base] |