Mercurial > hg
annotate mercurial/repoview.py @ 19093:6f27efc7db23 stable
hgweb: fix empty navigation detection
For some obscure reason, changelog.node(0) returns nullid if changelog is empty.
this break empty navigation detection. We fix this code by using the length of
the changelog.
Using the length have some issue with revision filtering but this is a small
step in the right direction. Proper fix comes in later changeset.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Tue, 30 Apr 2013 15:11:12 +0200 |
parents | 45348b4df46e |
children | 175c6fd8cacc |
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 import copy |
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10 import phases |
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11 import util |
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12 import obsolete, revset |
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13 |
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14 |
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15 def hideablerevs(repo): |
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16 """Revisions candidates to be hidden |
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17 |
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18 This is a standalone function to help extensions to wrap it.""" |
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19 return obsolete.getrevs(repo, 'obsolete') |
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20 |
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21 def computehidden(repo): |
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22 """compute the set of hidden revision to filter |
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23 |
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24 During most operation hidden should be filtered.""" |
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25 assert not repo.changelog.filteredrevs |
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26 hideable = hideablerevs(repo) |
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27 if hideable: |
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28 cl = repo.changelog |
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29 firsthideable = min(hideable) |
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30 revs = cl.revs(start=firsthideable) |
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31 blockers = [r for r in revset._children(repo, revs, hideable) |
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32 if r not in hideable] |
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33 for par in repo[None].parents(): |
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34 blockers.append(par.rev()) |
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35 for bm in repo._bookmarks.values(): |
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36 blockers.append(repo[bm].rev()) |
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37 blocked = cl.ancestors(blockers, inclusive=True) |
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38 return frozenset(r for r in hideable if r not in blocked) |
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39 return frozenset() |
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40 |
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41 def computeunserved(repo): |
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42 """compute the set of revision that should be filtered when used a server |
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43 |
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44 Secret and hidden changeset should not pretend to be here.""" |
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45 assert not repo.changelog.filteredrevs |
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46 # fast path in simple case to avoid impact of non optimised code |
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47 hiddens = filterrevs(repo, 'visible') |
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48 if phases.hassecret(repo): |
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49 cl = repo.changelog |
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50 secret = phases.secret |
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51 getphase = repo._phasecache.phase |
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52 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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53 revs = cl.revs(start=first) |
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54 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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55 return frozenset(hiddens | secrets) |
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56 else: |
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57 return hiddens |
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58 |
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59 def computemutable(repo): |
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60 """compute the set of revision that should be filtered when used a server |
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61 |
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62 Secret and hidden changeset should not pretend to be here.""" |
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63 assert not repo.changelog.filteredrevs |
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64 # fast check to avoid revset call on huge repo |
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65 if util.any(repo._phasecache.phaseroots[1:]): |
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66 getphase = repo._phasecache.phase |
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67 maymutable = filterrevs(repo, 'base') |
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68 return frozenset(r for r in maymutable if getphase(repo, r)) |
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69 return frozenset() |
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70 |
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71 def computeimpactable(repo): |
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72 """Everything impactable by mutable revision |
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73 |
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74 The immutable filter still have some chance to get invalidated. This will |
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75 happen when: |
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76 |
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77 - you garbage collect hidden changeset, |
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78 - public phase is moved backward, |
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79 - something is changed in the filtering (this could be fixed) |
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80 |
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81 This filter out any mutable changeset and any public changeset that may be |
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82 impacted by something happening to a mutable revision. |
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83 |
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84 This is achieved by filtered everything with a revision number egal or |
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85 higher than the first mutable changeset is filtered.""" |
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86 assert not repo.changelog.filteredrevs |
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87 cl = repo.changelog |
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88 firstmutable = len(cl) |
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89 for roots in repo._phasecache.phaseroots[1:]: |
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90 if roots: |
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91 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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92 # protect from nullrev root |
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93 firstmutable = max(0, firstmutable) |
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94 return frozenset(xrange(firstmutable, len(cl))) |
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95 |
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96 # function to compute filtered set |
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97 filtertable = {'visible': computehidden, |
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98 'served': computeunserved, |
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99 'immutable': computemutable, |
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100 'base': computeimpactable} |
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101 ### Nearest subset relation |
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102 # Nearest subset of filter X is a filter Y so that: |
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103 # * Y is included in X, |
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104 # * X - Y is as small as possible. |
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105 # This create and ordering used for branchmap purpose. |
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106 # the ordering may be partial |
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107 subsettable = {None: 'visible', |
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108 'visible': 'served', |
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109 'served': 'immutable', |
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110 'immutable': 'base'} |
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111 |
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112 def filterrevs(repo, filtername): |
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113 """returns set of filtered revision for this filter name""" |
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114 if filtername not in repo.filteredrevcache: |
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115 func = filtertable[filtername] |
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116 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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117 return repo.filteredrevcache[filtername] |
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118 |
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119 class repoview(object): |
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120 """Provide a read/write view of a repo through a filtered changelog |
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121 |
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122 This object is used to access a filtered version of a repository without |
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123 altering the original repository object itself. We can not alter the |
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124 original object for two main reasons: |
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125 - It prevents the use of a repo with multiple filters at the same time. In |
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126 particular when multiple threads are involved. |
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127 - It makes scope of the filtering harder to control. |
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128 |
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129 This object behaves very closely to the original repository. All attribute |
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130 operations are done on the original repository: |
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131 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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132 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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133 - A deletion of `repoview.someattr` actually drops `someattr` |
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134 from `repo.__dict__`. |
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135 |
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136 The only exception is the `changelog` property. It is overridden to return |
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137 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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138 `filtername` attribute of the view control the revisions that need to be |
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139 filtered. (the fact the changelog is copied is an implementation detail). |
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140 |
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141 Unlike attributes, this object intercepts all method calls. This means that |
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142 all methods are run on the `repoview` object with the filtered `changelog` |
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143 property. For this purpose the simple `repoview` class must be mixed with |
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144 the actual class of the repository. This ensures that the resulting |
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145 `repoview` object have the very same methods than the repo object. This |
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146 leads to the property below. |
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147 |
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148 repoview.method() --> repo.__class__.method(repoview) |
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149 |
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150 The inheritance has to be done dynamically because `repo` can be of any |
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151 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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152 """ |
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153 |
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154 def __init__(self, repo, filtername): |
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155 object.__setattr__(self, '_unfilteredrepo', repo) |
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156 object.__setattr__(self, 'filtername', filtername) |
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157 object.__setattr__(self, '_clcachekey', None) |
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158 object.__setattr__(self, '_clcache', None) |
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159 |
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160 # not a propertycache on purpose we shall implement a proper cache later |
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161 @property |
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162 def changelog(self): |
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163 """return a filtered version of the changeset |
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164 |
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165 this changelog must not be used for writing""" |
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166 # some cache may be implemented later |
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167 unfi = self._unfilteredrepo |
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168 unfichangelog = unfi.changelog |
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169 revs = filterrevs(unfi, self.filtername) |
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170 cl = self._clcache |
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171 newkey = (len(unfichangelog), unfichangelog.tip(), hash(revs)) |
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172 if cl is not None: |
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173 # we need to check curkey too for some obscure reason. |
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174 # MQ test show a corruption of the underlying repo (in _clcache) |
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175 # without change in the cachekey. |
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176 oldfilter = cl.filteredrevs |
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177 try: |
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178 cl.filterrevs = () # disable filtering for tip |
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179 curkey = (len(cl), cl.tip(), hash(oldfilter)) |
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180 finally: |
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181 cl.filteredrevs = oldfilter |
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182 if newkey != self._clcachekey or newkey != curkey: |
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183 cl = None |
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184 # could have been made None by the previous if |
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185 if cl is None: |
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186 cl = copy.copy(unfichangelog) |
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187 cl.filteredrevs = revs |
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188 object.__setattr__(self, '_clcache', cl) |
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189 object.__setattr__(self, '_clcachekey', newkey) |
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190 return cl |
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191 |
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192 def unfiltered(self): |
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193 """Return an unfiltered version of a repo""" |
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194 return self._unfilteredrepo |
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195 |
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196 def filtered(self, name): |
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197 """Return a filtered version of a repository""" |
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198 if name == self.filtername: |
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199 return self |
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200 return self.unfiltered().filtered(name) |
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201 |
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202 # everything access are forwarded to the proxied repo |
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203 def __getattr__(self, attr): |
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204 return getattr(self._unfilteredrepo, attr) |
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205 |
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206 def __setattr__(self, attr, value): |
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207 return setattr(self._unfilteredrepo, attr, value) |
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208 |
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209 def __delattr__(self, attr): |
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210 return delattr(self._unfilteredrepo, attr) |
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211 |
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212 # The `requirements` attribute is initialized during __init__. But |
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213 # __getattr__ won't be called as it also exists on the class. We need |
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214 # explicit forwarding to main repo here |
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215 @property |
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216 def requirements(self): |
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clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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217 return self._unfilteredrepo.requirements |
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clfilter: add actual repo filtering mechanism
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
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changeset
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218 |