Mercurial > hg
annotate mercurial/repoview.py @ 22149:16ef2c485f03
repoview: split _gethiddenblockers
Split up _gethiddenblockers into two categories: (1) "static' blockers
that solely rely on the contents of obstore and are visible children of
hidden changsets. (2) "dynamic" blockers, appearing by having wd parents,
bookmarks or tags pointing to hidden changesets.
We assume that (1) doesn't change often and can be easily cached with a good
invalidation strategy. (2) change often, but barely produce blockers, so we
can recompute them if necessary.
author | David Soria Parra <davidsp@fb.com> |
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date | Wed, 06 Aug 2014 13:26:04 -0700 |
parents | 43f300a198d4 |
children | 45b5cd948a4d |
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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 import copy |
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10 import phases |
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11 import util |
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12 import obsolete |
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13 import tags as tagsmod |
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14 |
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15 |
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16 def hideablerevs(repo): |
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17 """Revisions candidates to be hidden |
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18 |
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19 This is a standalone function to help extensions to wrap it.""" |
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20 return obsolete.getrevs(repo, 'obsolete') |
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21 |
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22 def _getstaticblockers(repo): |
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23 """Cacheable revisions blocking hidden changesets from being filtered. |
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24 |
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25 Additional non-cached hidden blockers are computed in _getdynamicblockers. |
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26 This is a standalone function to help extensions to wrap it.""" |
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27 assert not repo.changelog.filteredrevs |
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28 hideable = hideablerevs(repo) |
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29 blockers = set() |
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30 if hideable: |
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31 # We use cl to avoid recursive lookup from repo[xxx] |
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32 cl = repo.changelog |
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33 firsthideable = min(hideable) |
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34 revs = cl.revs(start=firsthideable) |
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35 tofilter = repo.revs( |
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36 '(%ld) and children(%ld)', list(revs), list(hideable)) |
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37 blockers.update([r for r in tofilter if r not in hideable]) |
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38 return blockers |
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39 |
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40 def _getdynamicblockers(repo): |
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41 """Non-cacheable revisions blocking hidden changesets from being filtered. |
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42 |
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43 Get revisions that will block hidden changesets and are likely to change, |
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44 but unlikely to create hidden blockers. They won't be cached, so be careful |
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45 with adding additional computation.""" |
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46 |
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47 cl = repo.changelog |
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48 blockers = set() |
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49 blockers.update([par.rev() for par in repo[None].parents()]) |
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50 blockers.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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51 |
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52 tags = {} |
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53 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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54 if tags: |
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55 rev, nodemap = cl.rev, cl.nodemap |
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56 blockers.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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57 return blockers |
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58 |
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59 def computehidden(repo): |
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60 """compute the set of hidden revision to filter |
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61 |
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62 During most operation hidden should be filtered.""" |
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63 assert not repo.changelog.filteredrevs |
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64 hidden = frozenset() |
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65 hideable = hideablerevs(repo) |
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66 if hideable: |
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67 cl = repo.changelog |
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68 blocked = cl.ancestors(_getstaticblockers(repo), inclusive=True) |
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69 hidden = frozenset(r for r in hideable if r not in blocked) |
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70 |
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71 # check if we have wd parents, bookmarks or tags pointing to hidden |
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72 # changesets and remove those. |
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73 dynamic = hidden & _getdynamicblockers(repo) |
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74 if dynamic: |
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75 blocked = cl.ancestors(dynamic, inclusive=True) |
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76 hidden = frozenset(r for r in hidden if r not in blocked) |
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77 return hidden |
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78 |
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79 def computeunserved(repo): |
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80 """compute the set of revision that should be filtered when used a server |
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81 |
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82 Secret and hidden changeset should not pretend to be here.""" |
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83 assert not repo.changelog.filteredrevs |
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84 # fast path in simple case to avoid impact of non optimised code |
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85 hiddens = filterrevs(repo, 'visible') |
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86 if phases.hassecret(repo): |
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87 cl = repo.changelog |
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88 secret = phases.secret |
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89 getphase = repo._phasecache.phase |
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90 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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91 revs = cl.revs(start=first) |
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92 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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93 return frozenset(hiddens | secrets) |
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94 else: |
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95 return hiddens |
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96 |
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97 def computemutable(repo): |
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98 """compute the set of revision that should be filtered when used a server |
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99 |
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100 Secret and hidden changeset should not pretend to be here.""" |
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101 assert not repo.changelog.filteredrevs |
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102 # fast check to avoid revset call on huge repo |
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103 if util.any(repo._phasecache.phaseroots[1:]): |
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104 getphase = repo._phasecache.phase |
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105 maymutable = filterrevs(repo, 'base') |
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106 return frozenset(r for r in maymutable if getphase(repo, r)) |
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107 return frozenset() |
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108 |
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109 def computeimpactable(repo): |
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110 """Everything impactable by mutable revision |
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111 |
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112 The immutable filter still have some chance to get invalidated. This will |
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113 happen when: |
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114 |
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115 - you garbage collect hidden changeset, |
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116 - public phase is moved backward, |
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117 - something is changed in the filtering (this could be fixed) |
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118 |
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119 This filter out any mutable changeset and any public changeset that may be |
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120 impacted by something happening to a mutable revision. |
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121 |
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122 This is achieved by filtered everything with a revision number egal or |
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123 higher than the first mutable changeset is filtered.""" |
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124 assert not repo.changelog.filteredrevs |
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125 cl = repo.changelog |
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126 firstmutable = len(cl) |
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127 for roots in repo._phasecache.phaseroots[1:]: |
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128 if roots: |
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129 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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130 # protect from nullrev root |
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131 firstmutable = max(0, firstmutable) |
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132 return frozenset(xrange(firstmutable, len(cl))) |
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133 |
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134 # function to compute filtered set |
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135 # |
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136 # When adding a new filter you MUST update the table at: |
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137 # mercurial.branchmap.subsettable |
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138 # Otherwise your filter will have to recompute all its branches cache |
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139 # from scratch (very slow). |
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140 filtertable = {'visible': computehidden, |
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141 'served': computeunserved, |
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142 'immutable': computemutable, |
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143 'base': computeimpactable} |
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144 |
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145 def filterrevs(repo, filtername): |
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146 """returns set of filtered revision for this filter name""" |
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147 if filtername not in repo.filteredrevcache: |
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148 func = filtertable[filtername] |
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149 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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150 return repo.filteredrevcache[filtername] |
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151 |
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152 class repoview(object): |
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153 """Provide a read/write view of a repo through a filtered changelog |
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154 |
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155 This object is used to access a filtered version of a repository without |
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156 altering the original repository object itself. We can not alter the |
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157 original object for two main reasons: |
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158 - It prevents the use of a repo with multiple filters at the same time. In |
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159 particular when multiple threads are involved. |
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160 - It makes scope of the filtering harder to control. |
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161 |
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162 This object behaves very closely to the original repository. All attribute |
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163 operations are done on the original repository: |
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164 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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165 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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166 - A deletion of `repoview.someattr` actually drops `someattr` |
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167 from `repo.__dict__`. |
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168 |
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169 The only exception is the `changelog` property. It is overridden to return |
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170 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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171 `filtername` attribute of the view control the revisions that need to be |
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172 filtered. (the fact the changelog is copied is an implementation detail). |
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173 |
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174 Unlike attributes, this object intercepts all method calls. This means that |
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175 all methods are run on the `repoview` object with the filtered `changelog` |
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176 property. For this purpose the simple `repoview` class must be mixed with |
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177 the actual class of the repository. This ensures that the resulting |
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178 `repoview` object have the very same methods than the repo object. This |
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179 leads to the property below. |
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180 |
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181 repoview.method() --> repo.__class__.method(repoview) |
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182 |
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183 The inheritance has to be done dynamically because `repo` can be of any |
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184 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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185 """ |
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186 |
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187 def __init__(self, repo, filtername): |
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188 object.__setattr__(self, '_unfilteredrepo', repo) |
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189 object.__setattr__(self, 'filtername', filtername) |
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190 object.__setattr__(self, '_clcachekey', None) |
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191 object.__setattr__(self, '_clcache', None) |
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192 |
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193 # not a propertycache on purpose we shall implement a proper cache later |
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194 @property |
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195 def changelog(self): |
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196 """return a filtered version of the changeset |
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197 |
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198 this changelog must not be used for writing""" |
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199 # some cache may be implemented later |
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200 unfi = self._unfilteredrepo |
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201 unfichangelog = unfi.changelog |
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202 revs = filterrevs(unfi, self.filtername) |
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203 cl = self._clcache |
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204 newkey = (len(unfichangelog), unfichangelog.tip(), hash(revs)) |
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205 if cl is not None: |
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206 # we need to check curkey too for some obscure reason. |
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207 # MQ test show a corruption of the underlying repo (in _clcache) |
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208 # without change in the cachekey. |
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209 oldfilter = cl.filteredrevs |
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210 try: |
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211 cl.filterrevs = () # disable filtering for tip |
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212 curkey = (len(cl), cl.tip(), hash(oldfilter)) |
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213 finally: |
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214 cl.filteredrevs = oldfilter |
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215 if newkey != self._clcachekey or newkey != curkey: |
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216 cl = None |
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217 # could have been made None by the previous if |
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218 if cl is None: |
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219 cl = copy.copy(unfichangelog) |
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220 cl.filteredrevs = revs |
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221 object.__setattr__(self, '_clcache', cl) |
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222 object.__setattr__(self, '_clcachekey', newkey) |
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223 return cl |
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224 |
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225 def unfiltered(self): |
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226 """Return an unfiltered version of a repo""" |
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227 return self._unfilteredrepo |
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228 |
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229 def filtered(self, name): |
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230 """Return a filtered version of a repository""" |
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231 if name == self.filtername: |
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232 return self |
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233 return self.unfiltered().filtered(name) |
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234 |
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235 # everything access are forwarded to the proxied repo |
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236 def __getattr__(self, attr): |
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237 return getattr(self._unfilteredrepo, attr) |
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238 |
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239 def __setattr__(self, attr, value): |
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240 return setattr(self._unfilteredrepo, attr, value) |
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241 |
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242 def __delattr__(self, attr): |
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243 return delattr(self._unfilteredrepo, attr) |
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244 |
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245 # The `requirements` attribute is initialized during __init__. But |
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246 # __getattr__ won't be called as it also exists on the class. We need |
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247 # explicit forwarding to main repo here |
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248 @property |
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249 def requirements(self): |
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250 return self._unfilteredrepo.requirements |