Mercurial > hg
annotate mercurial/repoview.py @ 19785:1d2ca307bf22
merge with stable
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 23 Sep 2013 13:26:11 -0700 |
parents | 45348b4df46e |
children | 175c6fd8cacc |
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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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217 return self._unfilteredrepo.requirements |
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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diff
changeset
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