Mercurial > hg
annotate mercurial/repoview.py @ 18245:aff706b3a21c
clfilter: add mutable filtering
It filters all mutable changesets, leaving only public changeset unfiltered.
This filtering set is expected to be much more stable that the previous one as
public changeset are unlikely to disapear.
The only official use of this filter is for branchcache.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Wed, 02 Jan 2013 01:57:46 +0100 |
parents | e4687edec014 |
children | 58ca19edc043 |
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 |
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13 |
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14 def computehidden(repo): |
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15 """compute the set of hidden revision to filter |
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16 |
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17 During most operation hidden should be filtered.""" |
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18 assert not repo.changelog.filteredrevs |
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19 if repo.obsstore: |
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20 return frozenset(repo.revs('hidden()')) |
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21 return frozenset() |
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22 |
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23 def computeunserved(repo): |
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24 """compute the set of revision that should be filtered when used a server |
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25 |
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26 Secret and hidden changeset should not pretend to be here.""" |
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27 assert not repo.changelog.filteredrevs |
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28 # fast path in simple case to avoid impact of non optimised code |
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29 if phases.hassecret(repo) or repo.obsstore: |
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30 return frozenset(repo.revs('hidden() + secret()')) |
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31 return frozenset() |
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32 |
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33 def computemutable(repo): |
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34 """compute the set of revision that should be filtered when used a server |
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35 |
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36 Secret and hidden changeset should not pretend to be here.""" |
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37 assert not repo.changelog.filteredrevs |
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38 # fast check to avoid revset call on huge repo |
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39 if util.any(repo._phasecache.phaseroots[1:]): |
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40 return frozenset(repo.revs('draft() + secret()')) |
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41 return frozenset() |
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42 |
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43 # function to compute filtered set |
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44 filtertable = {'hidden': computehidden, |
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45 'unserved': computeunserved, |
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46 'mutable': computemutable} |
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47 ### Nearest subset relation |
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48 # Nearest subset of filter X is a filter Y so that: |
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49 # * Y is included in X, |
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50 # * X - Y is as small as possible. |
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51 # This create and ordering used for branchmap purpose. |
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52 # the ordering may be partial |
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53 subsettable = {None: 'hidden', |
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54 'hidden': 'unserved', |
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55 'unserved': 'mutable'} |
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56 |
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57 def filteredrevs(repo, filtername): |
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58 """returns set of filtered revision for this filter name""" |
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59 if filtername not in repo.filteredrevcache: |
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60 func = filtertable[filtername] |
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61 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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62 return repo.filteredrevcache[filtername] |
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63 |
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64 class repoview(object): |
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65 """Provide a read/write view of a repo through a filtered changelog |
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66 |
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67 This object is used to access a filtered version of a repository without |
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68 altering the original repository object itself. We can not alter the |
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69 original object for two main reasons: |
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70 - It prevents the use of a repo with multiple filters at the same time. In |
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71 particular when multiple threads are involved. |
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72 - It makes scope of the filtering harder to control. |
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73 |
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74 This object behaves very closely to the original repository. All attribute |
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75 operations are done on the original repository: |
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76 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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77 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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78 - A deletion of `repoview.someattr` actually drops `someattr` |
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79 from `repo.__dict__`. |
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80 |
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81 The only exception is the `changelog` property. It is overridden to return |
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82 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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83 `filtername` attribute of the view control the revisions that need to be |
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84 filtered. (the fact the changelog is copied is an implementation detail). |
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85 |
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86 Unlike attributes, this object intercepts all method calls. This means that |
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87 all methods are run on the `repoview` object with the filtered `changelog` |
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88 property. For this purpose the simple `repoview` class must be mixed with |
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89 the actual class of the repository. This ensures that the resulting |
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90 `repoview` object have the very same methods than the repo object. This |
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91 leads to the property below. |
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92 |
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93 repoview.method() --> repo.__class__.method(repoview) |
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94 |
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95 The inheritance has to be done dynamically because `repo` can be of any |
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96 subclasses of `localrepo`. Eg: `bundlerepo` or `httprepo`. |
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97 """ |
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98 |
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99 def __init__(self, repo, filtername): |
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100 object.__setattr__(self, '_unfilteredrepo', repo) |
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101 object.__setattr__(self, 'filtername', filtername) |
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102 |
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103 # not a cacheproperty on purpose we shall implement a proper cache later |
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104 @property |
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105 def changelog(self): |
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106 """return a filtered version of the changeset |
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107 |
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108 this changelog must not be used for writing""" |
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109 # some cache may be implemented later |
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110 cl = copy.copy(self._unfilteredrepo.changelog) |
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111 cl.filteredrevs = filteredrevs(self._unfilteredrepo, self.filtername) |
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112 return cl |
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113 |
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114 def unfiltered(self): |
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115 """Return an unfiltered version of a repo""" |
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116 return self._unfilteredrepo |
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117 |
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118 def filtered(self, name): |
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119 """Return a filtered version of a repository""" |
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120 if name == self.filtername: |
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121 return self |
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122 return self.unfiltered().filtered(name) |
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123 |
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124 # everything access are forwarded to the proxied repo |
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125 def __getattr__(self, attr): |
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126 return getattr(self._unfilteredrepo, attr) |
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127 |
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128 def __setattr__(self, attr, value): |
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129 return setattr(self._unfilteredrepo, attr, value) |
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130 |
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131 def __delattr__(self, attr): |
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132 return delattr(self._unfilteredrepo, attr) |
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133 |
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134 # The `requirement` attribut is initialiazed during __init__. But |
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135 # __getattr__ won't be called as it also exists on the class. We need |
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136 # explicit forwarding to main repo here |
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137 @property |
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138 def requirements(self): |
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139 return self._unfilteredrepo.requirements |
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140 |