Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/repoview.py @ 32612:47e4c6bb39f1

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
hidden: rename "revealedrevs" to "pinnedrevs" (API) E.g. tags and bookmarks can reveal revisions that would otherwise be hidden. A revision can also be revealed because one if its descendants is visible. Let's use the term "pinned" for the former case (bookmarks etc.).
author Martin von Zweigbergk <martinvonz@google.com>
date Sat, 27 May 2017 21:08:51 -0700
parents bceb398e6d72
children b9b41d8f4522
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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19
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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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24
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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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30
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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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46
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47 def _consistencyblocker(pfunc, hideable, domain):
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48 """return non-hideable changeset blocking hideable one
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49
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50 For consistency, we cannot actually hide a changeset if one of it children
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51 are visible, this function find such children.
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52 """
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53 others = domain - hideable
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54 blockers = set()
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55 for r in others:
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56 for p in pfunc(r):
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57 if p != nullrev and p in hideable:
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58 blockers.add(r)
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59 break
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60 return blockers
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61
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62 def _domainancestors(pfunc, revs, domain):
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63 """return ancestors of 'revs' within 'domain'
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64
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65 - pfunc(r): a funtion returning parent of 'r',
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66 - revs: iterable of revnum,
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67 - domain: consistent set of revnum.
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68
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69 The domain must be consistent: no connected subset are the ancestors of
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70 another connected subset. In other words, if the parents of a revision are
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71 not in the domains, no other ancestors of that revision. For example, with
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72 the following graph:
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73
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74 F
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75 |
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76 E
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77 | D
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78 | |
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79 | C
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80 |/
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81 B
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82 |
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83 A
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84
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85 If C, D, E and F are in the domain but B is not, A cannot be ((A) is an
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86 ancestors disconnected subset disconnected of (C+D)).
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87
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88 (Ancestors are returned inclusively)
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89 """
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90 stack = list(revs)
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91 ancestors = set(stack)
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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 domain and p not in ancestors:
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95 ancestors.add(p)
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96 stack.append(p)
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97 return ancestors
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98
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99 def computehidden(repo):
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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 pfunc = repo.changelog.parentrevs
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108 mutablephases = (phases.draft, phases.secret)
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109 mutable = repo._phasecache.getrevset(repo, mutablephases)
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110
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111 blockers = _consistencyblocker(pfunc, hidden, mutable)
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112
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113 # check if we have wd parents, bookmarks or tags pointing to hidden
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114 # changesets and remove those.
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115 blockers |= (hidden & pinnedrevs(repo))
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116 if blockers:
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117 hidden = hidden - _domainancestors(pfunc, blockers, mutable)
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118 return frozenset(hidden)
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119
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120 def computeunserved(repo):
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121 """compute the set of revision that should be filtered when used a server
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122
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123 Secret and hidden changeset should not pretend to be here."""
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124 assert not repo.changelog.filteredrevs
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125 # fast path in simple case to avoid impact of non optimised code
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126 hiddens = filterrevs(repo, 'visible')
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127 if phases.hassecret(repo):
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128 cl = repo.changelog
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129 secret = phases.secret
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130 getphase = repo._phasecache.phase
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131 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret])
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132 revs = cl.revs(start=first)
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133 secrets = set(r for r in revs if getphase(repo, r) >= secret)
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134 return frozenset(hiddens | secrets)
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135 else:
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136 return hiddens
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137
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138 def computemutable(repo):
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139 """compute the set of revision that should be filtered when used a server
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140
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141 Secret and hidden changeset should not pretend to be here."""
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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 any(repo._phasecache.phaseroots[1:]):
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145 getphase = repo._phasecache.phase
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146 maymutable = filterrevs(repo, 'base')
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147 return frozenset(r for r in maymutable if getphase(repo, r))
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148 return frozenset()
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149
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150 def computeimpactable(repo):
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151 """Everything impactable by mutable revision
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152
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153 The immutable filter still have some chance to get invalidated. This will
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154 happen when:
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155
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156 - you garbage collect hidden changeset,
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157 - public phase is moved backward,
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158 - something is changed in the filtering (this could be fixed)
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159
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160 This filter out any mutable changeset and any public changeset that may be
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161 impacted by something happening to a mutable revision.
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162
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163 This is achieved by filtered everything with a revision number egal or
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164 higher than the first mutable changeset is filtered."""
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165 assert not repo.changelog.filteredrevs
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166 cl = repo.changelog
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167 firstmutable = len(cl)
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168 for roots in repo._phasecache.phaseroots[1:]:
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169 if roots:
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170 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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171 # protect from nullrev root
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172 firstmutable = max(0, firstmutable)
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173 return frozenset(xrange(firstmutable, len(cl)))
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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.branchmap.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 = {'visible': computehidden,
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182 'served': computeunserved,
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183 'immutable': computemutable,
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184 'base': computeimpactable}
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185
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186 def filterrevs(repo, filtername):
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187 """returns set of filtered revision for this filter name"""
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188 if filtername not in repo.filteredrevcache:
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189 func = filtertable[filtername]
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190 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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191 return repo.filteredrevcache[filtername]
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192
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193 class repoview(object):
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194 """Provide a read/write view of a repo through a filtered changelog
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195
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196 This object is used to access a filtered version of a repository without
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197 altering the original repository object itself. We can not alter the
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198 original object for two main reasons:
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199 - It prevents the use of a repo with multiple filters at the same time. In
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200 particular when multiple threads are involved.
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201 - It makes scope of the filtering harder to control.
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202
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203 This object behaves very closely to the original repository. All attribute
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204 operations are done on the original repository:
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205 - An access to `repoview.someattr` actually returns `repo.someattr`,
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206 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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207 - A deletion of `repoview.someattr` actually drops `someattr`
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208 from `repo.__dict__`.
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209
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210 The only exception is the `changelog` property. It is overridden to return
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211 a (surface) copy of `repo.changelog` with some revisions filtered. The
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212 `filtername` attribute of the view control the revisions that need to be
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213 filtered. (the fact the changelog is copied is an implementation detail).
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214
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215 Unlike attributes, this object intercepts all method calls. This means that
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216 all methods are run on the `repoview` object with the filtered `changelog`
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217 property. For this purpose the simple `repoview` class must be mixed with
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218 the actual class of the repository. This ensures that the resulting
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219 `repoview` object have the very same methods than the repo object. This
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220 leads to the property below.
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221
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222 repoview.method() --> repo.__class__.method(repoview)
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223
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224 The inheritance has to be done dynamically because `repo` can be of any
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225 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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226 """
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227
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228 def __init__(self, repo, filtername):
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229 object.__setattr__(self, r'_unfilteredrepo', repo)
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230 object.__setattr__(self, r'filtername', filtername)
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231 object.__setattr__(self, r'_clcachekey', None)
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232 object.__setattr__(self, r'_clcache', None)
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233
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234 # not a propertycache on purpose we shall implement a proper cache later
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235 @property
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236 def changelog(self):
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237 """return a filtered version of the changeset
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238
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239 this changelog must not be used for writing"""
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240 # some cache may be implemented later
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241 unfi = self._unfilteredrepo
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242 unfichangelog = unfi.changelog
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243 # bypass call to changelog.method
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244 unfiindex = unfichangelog.index
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parents: 27257
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245 unfilen = len(unfiindex) - 1
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parents: 27257
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246 unfinode = unfiindex[unfilen - 1][7]
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 27257
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247
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 18443
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248 revs = filterrevs(unfi, self.filtername)
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 18443
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249 cl = self._clcache
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 27257
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250 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 27917
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251 # if cl.index is not unfiindex, unfi.changelog would be
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 27917
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252 # recreated, and our clcache refers to garbage object
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 27917
diff changeset
253 if (cl is not None and
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 27917
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254 (cl.index is not unfiindex or newkey != self._clcachekey)):
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 27257
diff changeset
255 cl = None
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parents: 18443
diff changeset
256 # could have been made None by the previous if
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 18443
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257 if cl is None:
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parents: 18443
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258 cl = copy.copy(unfichangelog)
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parents: 18443
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259 cl.filteredrevs = revs
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4015dfc899bb repoview: specify setattr values as native strings
Augie Fackler <augie@google.com>
parents: 31231
diff changeset
260 object.__setattr__(self, r'_clcache', cl)
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Augie Fackler <augie@google.com>
parents: 31231
diff changeset
261 object.__setattr__(self, r'_clcachekey', newkey)
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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262 return cl
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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263
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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264 def unfiltered(self):
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parents:
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265 """Return an unfiltered version of a repo"""
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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266 return self._unfilteredrepo
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parents:
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267
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parents:
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268 def filtered(self, name):
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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269 """Return a filtered version of a repository"""
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
270 if name == self.filtername:
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
271 return self
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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272 return self.unfiltered().filtered(name)
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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273
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
274 # everything access are forwarded to the proxied repo
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
275 def __getattr__(self, attr):
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parents:
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276 return getattr(self._unfilteredrepo, attr)
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parents:
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277
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parents:
diff changeset
278 def __setattr__(self, attr, value):
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parents:
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279 return setattr(self._unfilteredrepo, attr, value)
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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280
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
281 def __delattr__(self, attr):
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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282 return delattr(self._unfilteredrepo, attr)
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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283
18644
3e92772d5383 spelling: fix some minor issues found by spell checker
Mads Kiilerich <mads@kiilerich.com>
parents: 18495
diff changeset
284 # The `requirements` attribute is initialized during __init__. But
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
285 # __getattr__ won't be called as it also exists on the class. We need
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
286 # explicit forwarding to main repo here
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
287 @property
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parents:
diff changeset
288 def requirements(self):
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
diff changeset
289 return self._unfilteredrepo.requirements