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annotate mercurial/repoview.py @ 33827:dedab036215d

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wireproto: use new peer interface The wirepeer class provides concrete implementations of peer interface methods for calling wire protocol commands. It makes sense for this class to inherit from the peer abstract base class. So we change that. Since httppeer and sshpeer have already been converted to the new interface, peerrepository is no longer adding any value. So it has been removed. httppeer and sshpeer have been updated to reflect the loss of peerrepository and the inheritance of the abstract base class in wirepeer. The code changes in wirepeer are reordering of methods to group by interface. Some Python code in tests was updated to reflect changed APIs. .. api:: peer.peerrepository has been removed. Use repository.peer abstract base class to represent a peer repository. Differential Revision: https://phab.mercurial-scm.org/D338
author Gregory Szorc <gregory.szorc@gmail.com>
date Thu, 10 Aug 2017 20:58:28 -0700
parents 48d1e1214d8c
children 586645e0589c
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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
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13 from .node import nullrev
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14 from . import (
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15 obsolete,
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16 phases,
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17 tags as tagsmod,
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18 )
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20 def hideablerevs(repo):
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21 """Revision candidates to be hidden
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22
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23 This is a standalone function to allow extensions to wrap it.
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25 Because we use the set of immutable changesets as a fallback subset in
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26 branchmap (see mercurial.branchmap.subsettable), you cannot set "public"
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27 changesets as "hideable". Doing so would break multiple code assertions and
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28 lead to crashes."""
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29 return obsolete.getrevs(repo, 'obsolete')
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31 def pinnedrevs(repo):
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32 """revisions blocking hidden changesets from being filtered
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33 """
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34
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35 cl = repo.changelog
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36 pinned = set()
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37 pinned.update([par.rev() for par in repo[None].parents()])
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38 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()])
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39
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40 tags = {}
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41 tagsmod.readlocaltags(repo.ui, repo, tags, {})
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42 if tags:
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43 rev, nodemap = cl.rev, cl.nodemap
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44 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap)
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45 return pinned
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47
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48 def _revealancestors(pfunc, hidden, revs):
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49 """reveals contiguous chains of hidden ancestors of 'revs' by removing them
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50 from 'hidden'
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51
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52 - pfunc(r): a funtion returning parent of 'r',
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53 - hidden: the (preliminary) hidden revisions, to be updated
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54 - revs: iterable of revnum,
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55
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56 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are
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57 *not* revealed)
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58 """
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59 stack = list(revs)
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60 while stack:
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61 for p in pfunc(stack.pop()):
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62 if p != nullrev and p in hidden:
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63 hidden.remove(p)
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64 stack.append(p)
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65
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66 def computehidden(repo):
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67 """compute the set of hidden revision to filter
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68
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69 During most operation hidden should be filtered."""
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70 assert not repo.changelog.filteredrevs
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71
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72 hidden = hideablerevs(repo)
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73 if hidden:
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74 hidden = set(hidden - pinnedrevs(repo))
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75 pfunc = repo.changelog.parentrevs
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76 mutablephases = (phases.draft, phases.secret)
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77 mutable = repo._phasecache.getrevset(repo, mutablephases)
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78
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79 visible = mutable - hidden
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80 _revealancestors(pfunc, hidden, visible)
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81 return frozenset(hidden)
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82
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83 def computeunserved(repo):
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84 """compute the set of revision that should be filtered when used a server
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85
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86 Secret and hidden changeset should not pretend to be here."""
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87 assert not repo.changelog.filteredrevs
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88 # fast path in simple case to avoid impact of non optimised code
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89 hiddens = filterrevs(repo, 'visible')
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90 if phases.hassecret(repo):
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91 cl = repo.changelog
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92 secret = phases.secret
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93 getphase = repo._phasecache.phase
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94 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret])
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95 revs = cl.revs(start=first)
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96 secrets = set(r for r in revs if getphase(repo, r) >= secret)
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97 return frozenset(hiddens | secrets)
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98 else:
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99 return hiddens
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100
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101 def computemutable(repo):
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102 """compute the set of revision that should be filtered when used a server
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103
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104 Secret and hidden changeset should not pretend to be here."""
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105 assert not repo.changelog.filteredrevs
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106 # fast check to avoid revset call on huge repo
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107 if any(repo._phasecache.phaseroots[1:]):
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108 getphase = repo._phasecache.phase
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109 maymutable = filterrevs(repo, 'base')
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110 return frozenset(r for r in maymutable if getphase(repo, r))
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111 return frozenset()
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112
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113 def computeimpactable(repo):
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114 """Everything impactable by mutable revision
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115
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116 The immutable filter still have some chance to get invalidated. This will
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117 happen when:
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118
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119 - you garbage collect hidden changeset,
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120 - public phase is moved backward,
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121 - something is changed in the filtering (this could be fixed)
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122
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123 This filter out any mutable changeset and any public changeset that may be
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124 impacted by something happening to a mutable revision.
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125
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126 This is achieved by filtered everything with a revision number egal or
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127 higher than the first mutable changeset is filtered."""
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128 assert not repo.changelog.filteredrevs
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129 cl = repo.changelog
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130 firstmutable = len(cl)
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131 for roots in repo._phasecache.phaseroots[1:]:
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132 if roots:
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133 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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134 # protect from nullrev root
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135 firstmutable = max(0, firstmutable)
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136 return frozenset(xrange(firstmutable, len(cl)))
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137
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138 # function to compute filtered set
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139 #
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140 # When adding a new filter you MUST update the table at:
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141 # mercurial.branchmap.subsettable
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142 # Otherwise your filter will have to recompute all its branches cache
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143 # from scratch (very slow).
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144 filtertable = {'visible': computehidden,
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145 'served': computeunserved,
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146 'immutable': computemutable,
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147 'base': computeimpactable}
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148
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149 def filterrevs(repo, filtername):
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150 """returns set of filtered revision for this filter name"""
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151 if filtername not in repo.filteredrevcache:
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152 func = filtertable[filtername]
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153 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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154 return repo.filteredrevcache[filtername]
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155
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156 class repoview(object):
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157 """Provide a read/write view of a repo through a filtered changelog
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158
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159 This object is used to access a filtered version of a repository without
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160 altering the original repository object itself. We can not alter the
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161 original object for two main reasons:
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162 - It prevents the use of a repo with multiple filters at the same time. In
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163 particular when multiple threads are involved.
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164 - It makes scope of the filtering harder to control.
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165
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166 This object behaves very closely to the original repository. All attribute
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167 operations are done on the original repository:
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168 - An access to `repoview.someattr` actually returns `repo.someattr`,
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169 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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170 - A deletion of `repoview.someattr` actually drops `someattr`
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171 from `repo.__dict__`.
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172
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173 The only exception is the `changelog` property. It is overridden to return
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174 a (surface) copy of `repo.changelog` with some revisions filtered. The
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175 `filtername` attribute of the view control the revisions that need to be
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176 filtered. (the fact the changelog is copied is an implementation detail).
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177
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178 Unlike attributes, this object intercepts all method calls. This means that
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179 all methods are run on the `repoview` object with the filtered `changelog`
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180 property. For this purpose the simple `repoview` class must be mixed with
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181 the actual class of the repository. This ensures that the resulting
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182 `repoview` object have the very same methods than the repo object. This
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183 leads to the property below.
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184
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185 repoview.method() --> repo.__class__.method(repoview)
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186
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187 The inheritance has to be done dynamically because `repo` can be of any
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188 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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189 """
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190
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191 def __init__(self, repo, filtername):
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192 object.__setattr__(self, r'_unfilteredrepo', repo)
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193 object.__setattr__(self, r'filtername', filtername)
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194 object.__setattr__(self, r'_clcachekey', None)
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195 object.__setattr__(self, r'_clcache', None)
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196
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197 # not a propertycache on purpose we shall implement a proper cache later
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198 @property
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199 def changelog(self):
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200 """return a filtered version of the changeset
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201
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202 this changelog must not be used for writing"""
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203 # some cache may be implemented later
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204 unfi = self._unfilteredrepo
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205 unfichangelog = unfi.changelog
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206 # bypass call to changelog.method
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207 unfiindex = unfichangelog.index
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208 unfilen = len(unfiindex) - 1
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209 unfinode = unfiindex[unfilen - 1][7]
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210
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211 revs = filterrevs(unfi, self.filtername)
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212 cl = self._clcache
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213 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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214 # if cl.index is not unfiindex, unfi.changelog would be
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215 # recreated, and our clcache refers to garbage object
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216 if (cl is not None and
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217 (cl.index is not unfiindex or newkey != self._clcachekey)):
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218 cl = None
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219 # could have been made None by the previous if
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220 if cl is None:
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221 cl = copy.copy(unfichangelog)
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222 cl.filteredrevs = revs
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223 object.__setattr__(self, r'_clcache', cl)
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224 object.__setattr__(self, r'_clcachekey', newkey)
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225 return cl
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226
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227 def unfiltered(self):
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228 """Return an unfiltered version of a repo"""
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229 return self._unfilteredrepo
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230
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231 def filtered(self, name):
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232 """Return a filtered version of a repository"""
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233 if name == self.filtername:
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234 return self
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235 return self.unfiltered().filtered(name)
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236
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237 # everything access are forwarded to the proxied repo
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238 def __getattr__(self, attr):
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239 return getattr(self._unfilteredrepo, attr)
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240
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241 def __setattr__(self, attr, value):
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242 return setattr(self._unfilteredrepo, attr, value)
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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diff changeset
243
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
244 def __delattr__(self, attr):
3a6ddacb7198 clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
245 return delattr(self._unfilteredrepo, attr)