Mercurial > hg
annotate mercurial/repoview.py @ 42231:d345627d104b
repoview: introduce a `experimental.extra-filter-revs` config
The option define revisions to additionally filter out of all repository "view".
The end goal is to provide and easy to way to serve multiple subset of the same
repository using multiple "shares".
The simplest use case of this feature is to have one view serving the public
changesets and one view also serving the draft. This is currently achievable
using the new `server.view` option introduced recently by Joerg Sonnenberger.
However, more advanced use cases need more advanced definitions. For example
some needs a view dedicated to some release branches, or view that hides
security fixes to be released. Joerg Sonnenberger and I discussed this topic at
the recent mini-sprint and the both of us have seen real life use cases for
this. (This series got written during the same mini-sprint).
The feature is fully functional, and use similar cache-fallback mechanism to
ensure decent performance. However,there remaining room to ensure each share
caches and hooks collaborate with each others. This will come at a later time
once users start to actually test this feature on real usecase.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 06 Apr 2019 17:46:19 +0200 |
parents | caebe5e7f4bd |
children | 2372284d9457 |
rev | line source |
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1 # repoview.py - Filtered view of a localrepo object |
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2 # |
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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4 # Logilab SA <contact@logilab.fr> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from __future__ import absolute_import |
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10 |
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11 import copy |
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12 import weakref |
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13 |
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14 from .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 util, |
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21 ) |
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22 from .utils import ( |
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23 repoviewutil, |
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24 ) |
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25 |
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26 def hideablerevs(repo): |
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27 """Revision candidates to be hidden |
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28 |
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29 This is a standalone function to allow extensions to wrap it. |
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30 |
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31 Because we use the set of immutable changesets as a fallback subset in |
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32 branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set |
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33 "public" changesets as "hideable". Doing so would break multiple code |
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34 assertions and lead to crashes.""" |
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35 obsoletes = obsolete.getrevs(repo, 'obsolete') |
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36 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) |
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37 internals = frozenset(internals) |
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38 return obsoletes | internals |
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39 |
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40 def pinnedrevs(repo): |
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41 """revisions blocking hidden changesets from being filtered |
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42 """ |
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43 |
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44 cl = repo.changelog |
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45 pinned = set() |
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46 pinned.update([par.rev() for par in repo[None].parents()]) |
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47 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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48 |
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49 tags = {} |
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50 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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51 if tags: |
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52 rev, nodemap = cl.rev, cl.nodemap |
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53 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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54 return pinned |
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55 |
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56 |
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57 def _revealancestors(pfunc, hidden, revs): |
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58 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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59 from 'hidden' |
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60 |
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61 - pfunc(r): a funtion returning parent of 'r', |
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62 - hidden: the (preliminary) hidden revisions, to be updated |
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63 - revs: iterable of revnum, |
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64 |
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65 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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66 *not* revealed) |
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67 """ |
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68 stack = list(revs) |
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69 while stack: |
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70 for p in pfunc(stack.pop()): |
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71 if p != nullrev and p in hidden: |
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72 hidden.remove(p) |
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73 stack.append(p) |
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74 |
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75 def computehidden(repo, visibilityexceptions=None): |
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76 """compute the set of hidden revision to filter |
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77 |
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78 During most operation hidden should be filtered.""" |
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79 assert not repo.changelog.filteredrevs |
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80 |
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81 hidden = hideablerevs(repo) |
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82 if hidden: |
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83 hidden = set(hidden - pinnedrevs(repo)) |
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84 if visibilityexceptions: |
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85 hidden -= visibilityexceptions |
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86 pfunc = repo.changelog.parentrevs |
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87 mutable = repo._phasecache.getrevset(repo, phases.mutablephases) |
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88 |
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89 visible = mutable - hidden |
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90 _revealancestors(pfunc, hidden, visible) |
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91 return frozenset(hidden) |
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92 |
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93 def computesecret(repo, visibilityexceptions=None): |
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94 """compute the set of revision that can never be exposed through hgweb |
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95 |
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96 Changeset in the secret phase (or above) should stay unaccessible.""" |
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97 assert not repo.changelog.filteredrevs |
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98 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) |
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99 return frozenset(secrets) |
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100 |
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101 def computeunserved(repo, visibilityexceptions=None): |
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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 path in simple case to avoid impact of non optimised code |
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107 hiddens = filterrevs(repo, 'visible') |
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108 secrets = filterrevs(repo, 'served.hidden') |
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109 if secrets: |
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110 return frozenset(hiddens | secrets) |
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111 else: |
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112 return hiddens |
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113 |
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114 def computemutable(repo, visibilityexceptions=None): |
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115 assert not repo.changelog.filteredrevs |
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116 # fast check to avoid revset call on huge repo |
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117 if any(repo._phasecache.phaseroots[1:]): |
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118 getphase = repo._phasecache.phase |
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119 maymutable = filterrevs(repo, 'base') |
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120 return frozenset(r for r in maymutable if getphase(repo, r)) |
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121 return frozenset() |
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122 |
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123 def computeimpactable(repo, visibilityexceptions=None): |
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124 """Everything impactable by mutable revision |
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125 |
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126 The immutable filter still have some chance to get invalidated. This will |
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127 happen when: |
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128 |
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129 - you garbage collect hidden changeset, |
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130 - public phase is moved backward, |
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131 - something is changed in the filtering (this could be fixed) |
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132 |
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133 This filter out any mutable changeset and any public changeset that may be |
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134 impacted by something happening to a mutable revision. |
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135 |
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136 This is achieved by filtered everything with a revision number egal or |
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137 higher than the first mutable changeset is filtered.""" |
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138 assert not repo.changelog.filteredrevs |
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139 cl = repo.changelog |
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140 firstmutable = len(cl) |
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141 for roots in repo._phasecache.phaseroots[1:]: |
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142 if roots: |
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143 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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144 # protect from nullrev root |
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145 firstmutable = max(0, firstmutable) |
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146 return frozenset(pycompat.xrange(firstmutable, len(cl))) |
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147 |
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148 # function to compute filtered set |
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149 # |
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150 # When adding a new filter you MUST update the table at: |
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151 # mercurial.utils.repoviewutil.subsettable |
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152 # Otherwise your filter will have to recompute all its branches cache |
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153 # from scratch (very slow). |
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154 filtertable = {'visible': computehidden, |
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155 'visible-hidden': computehidden, |
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156 'served.hidden': computesecret, |
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157 'served': computeunserved, |
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158 'immutable': computemutable, |
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159 'base': computeimpactable} |
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160 |
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161 _basefiltername = list(filtertable) |
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162 |
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163 def extrafilter(ui): |
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164 """initialize extra filter and return its id |
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165 |
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166 If extra filtering is configured, we make sure the associated filtered view |
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167 are declared and return the associated id. |
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168 """ |
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169 frevs = ui.config('experimental', 'extra-filter-revs') |
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170 if frevs is None: |
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171 return None |
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172 |
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173 fid = pycompat.sysbytes(util.DIGESTS['sha1'](frevs).hexdigest())[:12] |
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174 |
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175 combine = lambda fname: fname + '%' + fid |
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176 |
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177 subsettable = repoviewutil.subsettable |
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178 |
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179 if combine('base') not in filtertable: |
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180 for name in _basefiltername: |
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181 def extrafilteredrevs(repo, *args, **kwargs): |
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182 baserevs = filtertable[name](repo, *args, **kwargs) |
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183 extrarevs = frozenset(repo.revs(frevs)) |
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184 return baserevs | extrarevs |
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185 filtertable[combine(name)] = extrafilteredrevs |
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186 if name in subsettable: |
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187 subsettable[combine(name)] = combine(subsettable[name]) |
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188 return fid |
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189 |
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190 def filterrevs(repo, filtername, visibilityexceptions=None): |
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191 """returns set of filtered revision for this filter name |
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192 |
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193 visibilityexceptions is a set of revs which must are exceptions for |
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194 hidden-state and must be visible. They are dynamic and hence we should not |
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195 cache it's result""" |
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196 if filtername not in repo.filteredrevcache: |
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197 func = filtertable[filtername] |
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198 if visibilityexceptions: |
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199 return func(repo.unfiltered, visibilityexceptions) |
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200 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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201 return repo.filteredrevcache[filtername] |
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202 |
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203 class repoview(object): |
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204 """Provide a read/write view of a repo through a filtered changelog |
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205 |
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206 This object is used to access a filtered version of a repository without |
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207 altering the original repository object itself. We can not alter the |
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208 original object for two main reasons: |
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209 - It prevents the use of a repo with multiple filters at the same time. In |
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210 particular when multiple threads are involved. |
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211 - It makes scope of the filtering harder to control. |
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212 |
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213 This object behaves very closely to the original repository. All attribute |
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214 operations are done on the original repository: |
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215 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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216 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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217 - A deletion of `repoview.someattr` actually drops `someattr` |
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218 from `repo.__dict__`. |
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219 |
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220 The only exception is the `changelog` property. It is overridden to return |
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221 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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222 `filtername` attribute of the view control the revisions that need to be |
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223 filtered. (the fact the changelog is copied is an implementation detail). |
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224 |
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225 Unlike attributes, this object intercepts all method calls. This means that |
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226 all methods are run on the `repoview` object with the filtered `changelog` |
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227 property. For this purpose the simple `repoview` class must be mixed with |
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228 the actual class of the repository. This ensures that the resulting |
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229 `repoview` object have the very same methods than the repo object. This |
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230 leads to the property below. |
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231 |
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232 repoview.method() --> repo.__class__.method(repoview) |
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233 |
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234 The inheritance has to be done dynamically because `repo` can be of any |
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235 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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236 """ |
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237 |
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238 def __init__(self, repo, filtername, visibilityexceptions=None): |
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239 object.__setattr__(self, r'_unfilteredrepo', repo) |
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240 object.__setattr__(self, r'filtername', filtername) |
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241 object.__setattr__(self, r'_clcachekey', None) |
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242 object.__setattr__(self, r'_clcache', None) |
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243 # revs which are exceptions and must not be hidden |
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244 object.__setattr__(self, r'_visibilityexceptions', |
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245 visibilityexceptions) |
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246 |
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247 # not a propertycache on purpose we shall implement a proper cache later |
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248 @property |
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249 def changelog(self): |
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250 """return a filtered version of the changeset |
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251 |
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252 this changelog must not be used for writing""" |
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253 # some cache may be implemented later |
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254 unfi = self._unfilteredrepo |
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255 unfichangelog = unfi.changelog |
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256 # bypass call to changelog.method |
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257 unfiindex = unfichangelog.index |
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258 unfilen = len(unfiindex) |
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259 unfinode = unfiindex[unfilen - 1][7] |
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260 |
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261 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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262 cl = self._clcache |
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263 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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264 # if cl.index is not unfiindex, unfi.changelog would be |
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265 # recreated, and our clcache refers to garbage object |
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266 if (cl is not None and |
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267 (cl.index is not unfiindex or newkey != self._clcachekey)): |
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268 cl = None |
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269 # could have been made None by the previous if |
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270 if cl is None: |
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271 cl = copy.copy(unfichangelog) |
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272 cl.filteredrevs = revs |
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273 object.__setattr__(self, r'_clcache', cl) |
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274 object.__setattr__(self, r'_clcachekey', newkey) |
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275 return cl |
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276 |
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277 def unfiltered(self): |
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278 """Return an unfiltered version of a repo""" |
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279 return self._unfilteredrepo |
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280 |
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281 def filtered(self, name, visibilityexceptions=None): |
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282 """Return a filtered version of a repository""" |
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283 if name == self.filtername and not visibilityexceptions: |
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284 return self |
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285 return self.unfiltered().filtered(name, visibilityexceptions) |
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286 |
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287 def __repr__(self): |
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288 return r'<%s:%s %r>' % (self.__class__.__name__, |
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289 pycompat.sysstr(self.filtername), |
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290 self.unfiltered()) |
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291 |
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292 # everything access are forwarded to the proxied repo |
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293 def __getattr__(self, attr): |
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294 return getattr(self._unfilteredrepo, attr) |
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295 |
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296 def __setattr__(self, attr, value): |
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297 return setattr(self._unfilteredrepo, attr, value) |
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298 |
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299 def __delattr__(self, attr): |
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300 return delattr(self._unfilteredrepo, attr) |
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301 |
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302 # Python <3.4 easily leaks types via __mro__. See |
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303 # https://bugs.python.org/issue17950. We cache dynamically created types |
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304 # so they won't be leaked on every invocation of repo.filtered(). |
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305 _filteredrepotypes = weakref.WeakKeyDictionary() |
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306 |
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307 def newtype(base): |
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308 """Create a new type with the repoview mixin and the given base class""" |
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309 if base not in _filteredrepotypes: |
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310 class filteredrepo(repoview, base): |
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311 pass |
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312 _filteredrepotypes[base] = filteredrepo |
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313 return _filteredrepotypes[base] |