Mercurial > hg
annotate mercurial/repoview.py @ 37733:d43810fe52b0
tests: port inline extensions in test-http.t to Python 3
Differential Revision: https://phab.mercurial-scm.org/D3342
author | Augie Fackler <augie@google.com> |
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date | Fri, 13 Apr 2018 21:22:05 -0400 |
parents | 07fdac1d5c66 |
children | 5b592ac502ef |
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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 return obsolete.getrevs(repo, 'obsolete') |
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32 |
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33 def pinnedrevs(repo): |
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34 """revisions blocking hidden changesets from being filtered |
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35 """ |
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36 |
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37 cl = repo.changelog |
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38 pinned = set() |
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39 pinned.update([par.rev() for par in repo[None].parents()]) |
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40 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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41 |
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42 tags = {} |
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43 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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44 if tags: |
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45 rev, nodemap = cl.rev, cl.nodemap |
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46 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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47 return pinned |
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48 |
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49 |
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50 def _revealancestors(pfunc, hidden, revs): |
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51 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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52 from 'hidden' |
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53 |
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54 - pfunc(r): a funtion returning parent of 'r', |
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55 - hidden: the (preliminary) hidden revisions, to be updated |
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56 - revs: iterable of revnum, |
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57 |
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58 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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59 *not* revealed) |
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60 """ |
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61 stack = list(revs) |
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62 while stack: |
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63 for p in pfunc(stack.pop()): |
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64 if p != nullrev and p in hidden: |
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65 hidden.remove(p) |
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66 stack.append(p) |
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67 |
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68 def computehidden(repo, visibilityexceptions=None): |
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69 """compute the set of hidden revision to filter |
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70 |
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71 During most operation hidden should be filtered.""" |
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72 assert not repo.changelog.filteredrevs |
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73 |
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74 hidden = hideablerevs(repo) |
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75 if hidden: |
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76 hidden = set(hidden - pinnedrevs(repo)) |
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77 if visibilityexceptions: |
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78 hidden -= visibilityexceptions |
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79 pfunc = repo.changelog.parentrevs |
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80 mutablephases = (phases.draft, phases.secret) |
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81 mutable = repo._phasecache.getrevset(repo, mutablephases) |
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82 |
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83 visible = mutable - hidden |
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84 _revealancestors(pfunc, hidden, visible) |
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85 return frozenset(hidden) |
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86 |
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87 def computeunserved(repo, visibilityexceptions=None): |
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88 """compute the set of revision that should be filtered when used a server |
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89 |
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90 Secret and hidden changeset should not pretend to be here.""" |
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91 assert not repo.changelog.filteredrevs |
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92 # fast path in simple case to avoid impact of non optimised code |
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93 hiddens = filterrevs(repo, 'visible') |
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94 if phases.hassecret(repo): |
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95 cl = repo.changelog |
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96 secret = phases.secret |
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97 getphase = repo._phasecache.phase |
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98 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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99 revs = cl.revs(start=first) |
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100 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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101 return frozenset(hiddens | secrets) |
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102 else: |
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103 return hiddens |
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104 |
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105 def computemutable(repo, visibilityexceptions=None): |
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106 assert not repo.changelog.filteredrevs |
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107 # fast check to avoid revset call on huge repo |
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108 if any(repo._phasecache.phaseroots[1:]): |
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109 getphase = repo._phasecache.phase |
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110 maymutable = filterrevs(repo, 'base') |
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111 return frozenset(r for r in maymutable if getphase(repo, r)) |
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112 return frozenset() |
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113 |
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114 def computeimpactable(repo, visibilityexceptions=None): |
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115 """Everything impactable by mutable revision |
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116 |
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117 The immutable filter still have some chance to get invalidated. This will |
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118 happen when: |
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119 |
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120 - you garbage collect hidden changeset, |
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121 - public phase is moved backward, |
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122 - something is changed in the filtering (this could be fixed) |
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123 |
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124 This filter out any mutable changeset and any public changeset that may be |
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125 impacted by something happening to a mutable revision. |
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126 |
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127 This is achieved by filtered everything with a revision number egal or |
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128 higher than the first mutable changeset is filtered.""" |
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129 assert not repo.changelog.filteredrevs |
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130 cl = repo.changelog |
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131 firstmutable = len(cl) |
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132 for roots in repo._phasecache.phaseroots[1:]: |
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133 if roots: |
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134 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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135 # protect from nullrev root |
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136 firstmutable = max(0, firstmutable) |
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137 return frozenset(xrange(firstmutable, len(cl))) |
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138 |
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139 # function to compute filtered set |
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140 # |
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141 # When adding a new filter you MUST update the table at: |
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142 # mercurial.branchmap.subsettable |
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143 # Otherwise your filter will have to recompute all its branches cache |
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144 # from scratch (very slow). |
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145 filtertable = {'visible': computehidden, |
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146 'visible-hidden': computehidden, |
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147 'served': computeunserved, |
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148 'immutable': computemutable, |
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149 'base': computeimpactable} |
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150 |
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151 def filterrevs(repo, filtername, visibilityexceptions=None): |
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152 """returns set of filtered revision for this filter name |
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153 |
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154 visibilityexceptions is a set of revs which must are exceptions for |
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155 hidden-state and must be visible. They are dynamic and hence we should not |
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156 cache it's result""" |
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157 if filtername not in repo.filteredrevcache: |
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158 func = filtertable[filtername] |
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159 if visibilityexceptions: |
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160 return func(repo.unfiltered, visibilityexceptions) |
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161 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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162 return repo.filteredrevcache[filtername] |
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163 |
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164 class repoview(object): |
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165 """Provide a read/write view of a repo through a filtered changelog |
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166 |
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167 This object is used to access a filtered version of a repository without |
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168 altering the original repository object itself. We can not alter the |
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169 original object for two main reasons: |
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170 - It prevents the use of a repo with multiple filters at the same time. In |
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171 particular when multiple threads are involved. |
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172 - It makes scope of the filtering harder to control. |
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173 |
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174 This object behaves very closely to the original repository. All attribute |
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175 operations are done on the original repository: |
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176 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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177 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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178 - A deletion of `repoview.someattr` actually drops `someattr` |
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179 from `repo.__dict__`. |
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180 |
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181 The only exception is the `changelog` property. It is overridden to return |
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182 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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183 `filtername` attribute of the view control the revisions that need to be |
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184 filtered. (the fact the changelog is copied is an implementation detail). |
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185 |
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186 Unlike attributes, this object intercepts all method calls. This means that |
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187 all methods are run on the `repoview` object with the filtered `changelog` |
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188 property. For this purpose the simple `repoview` class must be mixed with |
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189 the actual class of the repository. This ensures that the resulting |
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190 `repoview` object have the very same methods than the repo object. This |
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191 leads to the property below. |
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192 |
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193 repoview.method() --> repo.__class__.method(repoview) |
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194 |
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195 The inheritance has to be done dynamically because `repo` can be of any |
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196 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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197 """ |
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198 |
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199 def __init__(self, repo, filtername, visibilityexceptions=None): |
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200 object.__setattr__(self, r'_unfilteredrepo', repo) |
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201 object.__setattr__(self, r'filtername', filtername) |
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202 object.__setattr__(self, r'_clcachekey', None) |
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203 object.__setattr__(self, r'_clcache', None) |
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204 # revs which are exceptions and must not be hidden |
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205 object.__setattr__(self, r'_visibilityexceptions', |
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206 visibilityexceptions) |
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207 |
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208 # not a propertycache on purpose we shall implement a proper cache later |
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209 @property |
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210 def changelog(self): |
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211 """return a filtered version of the changeset |
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212 |
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213 this changelog must not be used for writing""" |
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214 # some cache may be implemented later |
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215 unfi = self._unfilteredrepo |
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216 unfichangelog = unfi.changelog |
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217 # bypass call to changelog.method |
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218 unfiindex = unfichangelog.index |
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219 unfilen = len(unfiindex) - 1 |
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220 unfinode = unfiindex[unfilen - 1][7] |
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221 |
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222 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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223 cl = self._clcache |
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224 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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225 # if cl.index is not unfiindex, unfi.changelog would be |
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226 # recreated, and our clcache refers to garbage object |
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227 if (cl is not None and |
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228 (cl.index is not unfiindex or newkey != self._clcachekey)): |
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229 cl = None |
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230 # could have been made None by the previous if |
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231 if cl is None: |
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232 cl = copy.copy(unfichangelog) |
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233 cl.filteredrevs = revs |
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234 object.__setattr__(self, r'_clcache', cl) |
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235 object.__setattr__(self, r'_clcachekey', newkey) |
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236 return cl |
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237 |
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238 def unfiltered(self): |
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239 """Return an unfiltered version of a repo""" |
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240 return self._unfilteredrepo |
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241 |
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242 def filtered(self, name, visibilityexceptions=None): |
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243 """Return a filtered version of a repository""" |
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244 if name == self.filtername and not visibilityexceptions: |
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245 return self |
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246 return self.unfiltered().filtered(name, visibilityexceptions) |
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247 |
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248 def __repr__(self): |
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249 return r'<%s:%s %r>' % (self.__class__.__name__, |
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250 pycompat.sysstr(self.filtername), |
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251 self.unfiltered()) |
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252 |
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253 # everything access are forwarded to the proxied repo |
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254 def __getattr__(self, attr): |
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255 return getattr(self._unfilteredrepo, attr) |
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256 |
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257 def __setattr__(self, attr, value): |
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258 return setattr(self._unfilteredrepo, attr, value) |
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259 |
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260 def __delattr__(self, attr): |
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261 return delattr(self._unfilteredrepo, attr) |
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262 |
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263 # Python <3.4 easily leaks types via __mro__. See |
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264 # https://bugs.python.org/issue17950. We cache dynamically created types |
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265 # so they won't be leaked on every invocation of repo.filtered(). |
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266 _filteredrepotypes = weakref.WeakKeyDictionary() |
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267 |
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268 def newtype(base): |
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269 """Create a new type with the repoview mixin and the given base class""" |
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270 if base not in _filteredrepotypes: |
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271 class filteredrepo(repoview, base): |
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272 pass |
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273 _filteredrepotypes[base] = filteredrepo |
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274 return _filteredrepotypes[base] |