Mercurial > hg
annotate mercurial/repoview.py @ 43090:1f339b503a40
py3: manually import pycompat.delattr where it is needed
And with this change, we no longer need the auto-inserted import statement
in the source transformer, so it has been removed!
Differential Revision: https://phab.mercurial-scm.org/D7010
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 16:58:55 -0400 |
parents | c59eb1560c44 |
children | 4353942be294 |
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 .pycompat import ( |
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16 delattr, |
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17 getattr, |
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18 setattr, |
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19 ) |
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20 from . import ( |
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21 obsolete, |
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22 phases, |
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23 pycompat, |
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24 tags as tagsmod, |
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25 util, |
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26 ) |
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27 from .utils import repoviewutil |
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28 |
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29 |
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30 def hideablerevs(repo): |
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31 """Revision candidates to be hidden |
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32 |
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33 This is a standalone function to allow extensions to wrap it. |
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34 |
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35 Because we use the set of immutable changesets as a fallback subset in |
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36 branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set |
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37 "public" changesets as "hideable". Doing so would break multiple code |
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38 assertions and lead to crashes.""" |
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39 obsoletes = obsolete.getrevs(repo, b'obsolete') |
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40 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) |
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41 internals = frozenset(internals) |
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42 return obsoletes | internals |
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43 |
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44 |
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45 def pinnedrevs(repo): |
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46 """revisions blocking hidden changesets from being filtered |
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47 """ |
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48 |
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49 cl = repo.changelog |
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50 pinned = set() |
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51 pinned.update([par.rev() for par in repo[None].parents()]) |
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52 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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53 |
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54 tags = {} |
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55 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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56 if tags: |
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57 rev, nodemap = cl.rev, cl.nodemap |
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58 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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59 return pinned |
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60 |
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61 |
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62 def _revealancestors(pfunc, hidden, revs): |
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63 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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64 from 'hidden' |
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65 |
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66 - pfunc(r): a funtion returning parent of 'r', |
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67 - hidden: the (preliminary) hidden revisions, to be updated |
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68 - revs: iterable of revnum, |
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69 |
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70 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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71 *not* revealed) |
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72 """ |
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73 stack = list(revs) |
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74 while stack: |
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75 for p in pfunc(stack.pop()): |
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76 if p != nullrev and p in hidden: |
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77 hidden.remove(p) |
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78 stack.append(p) |
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79 |
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80 |
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81 def computehidden(repo, visibilityexceptions=None): |
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82 """compute the set of hidden revision to filter |
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83 |
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84 During most operation hidden should be filtered.""" |
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85 assert not repo.changelog.filteredrevs |
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86 |
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87 hidden = hideablerevs(repo) |
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88 if hidden: |
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89 hidden = set(hidden - pinnedrevs(repo)) |
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90 if visibilityexceptions: |
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91 hidden -= visibilityexceptions |
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92 pfunc = repo.changelog.parentrevs |
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93 mutable = repo._phasecache.getrevset(repo, phases.mutablephases) |
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94 |
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95 visible = mutable - hidden |
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96 _revealancestors(pfunc, hidden, visible) |
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97 return frozenset(hidden) |
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98 |
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99 |
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100 def computesecret(repo, visibilityexceptions=None): |
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101 """compute the set of revision that can never be exposed through hgweb |
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102 |
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103 Changeset in the secret phase (or above) should stay unaccessible.""" |
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104 assert not repo.changelog.filteredrevs |
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105 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) |
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106 return frozenset(secrets) |
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107 |
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108 |
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109 def computeunserved(repo, visibilityexceptions=None): |
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110 """compute the set of revision that should be filtered when used a server |
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111 |
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112 Secret and hidden changeset should not pretend to be here.""" |
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113 assert not repo.changelog.filteredrevs |
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114 # fast path in simple case to avoid impact of non optimised code |
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115 hiddens = filterrevs(repo, b'visible') |
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116 secrets = filterrevs(repo, b'served.hidden') |
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117 if secrets: |
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118 return frozenset(hiddens | secrets) |
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119 else: |
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120 return hiddens |
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121 |
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122 |
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123 def computemutable(repo, visibilityexceptions=None): |
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124 assert not repo.changelog.filteredrevs |
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125 # fast check to avoid revset call on huge repo |
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126 if any(repo._phasecache.phaseroots[1:]): |
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127 getphase = repo._phasecache.phase |
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128 maymutable = filterrevs(repo, b'base') |
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129 return frozenset(r for r in maymutable if getphase(repo, r)) |
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130 return frozenset() |
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131 |
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132 |
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133 def computeimpactable(repo, visibilityexceptions=None): |
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134 """Everything impactable by mutable revision |
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135 |
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136 The immutable filter still have some chance to get invalidated. This will |
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137 happen when: |
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138 |
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139 - you garbage collect hidden changeset, |
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140 - public phase is moved backward, |
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141 - something is changed in the filtering (this could be fixed) |
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142 |
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143 This filter out any mutable changeset and any public changeset that may be |
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144 impacted by something happening to a mutable revision. |
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145 |
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146 This is achieved by filtered everything with a revision number egal or |
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147 higher than the first mutable changeset is filtered.""" |
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148 assert not repo.changelog.filteredrevs |
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149 cl = repo.changelog |
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150 firstmutable = len(cl) |
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151 for roots in repo._phasecache.phaseroots[1:]: |
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152 if roots: |
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153 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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154 # protect from nullrev root |
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155 firstmutable = max(0, firstmutable) |
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156 return frozenset(pycompat.xrange(firstmutable, len(cl))) |
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157 |
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158 |
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159 # function to compute filtered set |
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160 # |
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161 # When adding a new filter you MUST update the table at: |
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162 # mercurial.utils.repoviewutil.subsettable |
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163 # Otherwise your filter will have to recompute all its branches cache |
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164 # from scratch (very slow). |
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165 filtertable = { |
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166 b'visible': computehidden, |
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167 b'visible-hidden': computehidden, |
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168 b'served.hidden': computesecret, |
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169 b'served': computeunserved, |
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170 b'immutable': computemutable, |
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171 b'base': computeimpactable, |
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172 } |
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173 |
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174 _basefiltername = list(filtertable) |
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175 |
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176 |
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177 def extrafilter(ui): |
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178 """initialize extra filter and return its id |
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179 |
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180 If extra filtering is configured, we make sure the associated filtered view |
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181 are declared and return the associated id. |
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182 """ |
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183 frevs = ui.config(b'experimental', b'extra-filter-revs') |
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184 if frevs is None: |
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185 return None |
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186 |
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187 fid = pycompat.sysbytes(util.DIGESTS[b'sha1'](frevs).hexdigest())[:12] |
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188 |
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189 combine = lambda fname: fname + b'%' + fid |
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190 |
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191 subsettable = repoviewutil.subsettable |
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192 |
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193 if combine(b'base') not in filtertable: |
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194 for name in _basefiltername: |
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195 |
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196 def extrafilteredrevs(repo, *args, **kwargs): |
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197 baserevs = filtertable[name](repo, *args, **kwargs) |
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198 extrarevs = frozenset(repo.revs(frevs)) |
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199 return baserevs | extrarevs |
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200 |
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201 filtertable[combine(name)] = extrafilteredrevs |
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202 if name in subsettable: |
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203 subsettable[combine(name)] = combine(subsettable[name]) |
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204 return fid |
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205 |
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206 |
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207 def filterrevs(repo, filtername, visibilityexceptions=None): |
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208 """returns set of filtered revision for this filter name |
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209 |
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210 visibilityexceptions is a set of revs which must are exceptions for |
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211 hidden-state and must be visible. They are dynamic and hence we should not |
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212 cache it's result""" |
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213 if filtername not in repo.filteredrevcache: |
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214 func = filtertable[filtername] |
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215 if visibilityexceptions: |
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216 return func(repo.unfiltered, visibilityexceptions) |
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217 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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218 return repo.filteredrevcache[filtername] |
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219 |
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220 |
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221 class repoview(object): |
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222 """Provide a read/write view of a repo through a filtered changelog |
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223 |
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224 This object is used to access a filtered version of a repository without |
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225 altering the original repository object itself. We can not alter the |
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226 original object for two main reasons: |
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227 - It prevents the use of a repo with multiple filters at the same time. In |
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228 particular when multiple threads are involved. |
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229 - It makes scope of the filtering harder to control. |
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230 |
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231 This object behaves very closely to the original repository. All attribute |
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232 operations are done on the original repository: |
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233 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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234 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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235 - A deletion of `repoview.someattr` actually drops `someattr` |
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236 from `repo.__dict__`. |
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237 |
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238 The only exception is the `changelog` property. It is overridden to return |
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239 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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240 `filtername` attribute of the view control the revisions that need to be |
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241 filtered. (the fact the changelog is copied is an implementation detail). |
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242 |
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243 Unlike attributes, this object intercepts all method calls. This means that |
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244 all methods are run on the `repoview` object with the filtered `changelog` |
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245 property. For this purpose the simple `repoview` class must be mixed with |
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246 the actual class of the repository. This ensures that the resulting |
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247 `repoview` object have the very same methods than the repo object. This |
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248 leads to the property below. |
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249 |
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250 repoview.method() --> repo.__class__.method(repoview) |
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251 |
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252 The inheritance has to be done dynamically because `repo` can be of any |
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253 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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254 """ |
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255 |
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256 def __init__(self, repo, filtername, visibilityexceptions=None): |
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257 object.__setattr__(self, r'_unfilteredrepo', repo) |
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258 object.__setattr__(self, r'filtername', filtername) |
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259 object.__setattr__(self, r'_clcachekey', None) |
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260 object.__setattr__(self, r'_clcache', None) |
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261 # revs which are exceptions and must not be hidden |
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262 object.__setattr__(self, r'_visibilityexceptions', visibilityexceptions) |
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263 |
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264 # not a propertycache on purpose we shall implement a proper cache later |
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265 @property |
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266 def changelog(self): |
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267 """return a filtered version of the changeset |
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268 |
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269 this changelog must not be used for writing""" |
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270 # some cache may be implemented later |
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271 unfi = self._unfilteredrepo |
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272 unfichangelog = unfi.changelog |
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273 # bypass call to changelog.method |
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274 unfiindex = unfichangelog.index |
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275 unfilen = len(unfiindex) |
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276 unfinode = unfiindex[unfilen - 1][7] |
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277 |
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278 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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279 cl = self._clcache |
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280 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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281 # if cl.index is not unfiindex, unfi.changelog would be |
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282 # recreated, and our clcache refers to garbage object |
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283 if cl is not None and ( |
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284 cl.index is not unfiindex or newkey != self._clcachekey |
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285 ): |
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286 cl = None |
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287 # could have been made None by the previous if |
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288 if cl is None: |
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289 cl = copy.copy(unfichangelog) |
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290 cl.filteredrevs = revs |
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291 object.__setattr__(self, r'_clcache', cl) |
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292 object.__setattr__(self, r'_clcachekey', newkey) |
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293 return cl |
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294 |
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295 def unfiltered(self): |
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296 """Return an unfiltered version of a repo""" |
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297 return self._unfilteredrepo |
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298 |
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299 def filtered(self, name, visibilityexceptions=None): |
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300 """Return a filtered version of a repository""" |
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301 if name == self.filtername and not visibilityexceptions: |
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302 return self |
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303 return self.unfiltered().filtered(name, visibilityexceptions) |
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304 |
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305 def __repr__(self): |
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306 return r'<%s:%s %r>' % ( |
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307 self.__class__.__name__, |
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308 pycompat.sysstr(self.filtername), |
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309 self.unfiltered(), |
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310 ) |
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311 |
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312 # everything access are forwarded to the proxied repo |
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313 def __getattr__(self, attr): |
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314 return getattr(self._unfilteredrepo, attr) |
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315 |
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316 def __setattr__(self, attr, value): |
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317 return setattr(self._unfilteredrepo, attr, value) |
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318 |
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319 def __delattr__(self, attr): |
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320 return delattr(self._unfilteredrepo, attr) |
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321 |
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322 |
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323 # Python <3.4 easily leaks types via __mro__. See |
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324 # https://bugs.python.org/issue17950. We cache dynamically created types |
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325 # so they won't be leaked on every invocation of repo.filtered(). |
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326 _filteredrepotypes = weakref.WeakKeyDictionary() |
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327 |
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328 |
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329 def newtype(base): |
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330 """Create a new type with the repoview mixin and the given base class""" |
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331 if base not in _filteredrepotypes: |
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332 |
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333 class filteredrepo(repoview, base): |
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334 pass |
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335 |
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336 _filteredrepotypes[base] = filteredrepo |
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337 return _filteredrepotypes[base] |