Mercurial > hg
annotate mercurial/repoview.py @ 18242:e4687edec014
clfilter: introduces a hidden filter
This filter exclude all hidden revision. We plan to use this filter to hide
revision instead of manually checking contents of the hidden revisions set.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Mon, 07 Jan 2013 19:24:06 +0100 |
parents | 59a9f18d4587 |
children | aff706b3a21c |
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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 |
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12 |
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13 def computehidden(repo): |
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14 """compute the set of hidden revision to filter |
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15 |
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16 During most operation hidden should be filtered.""" |
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17 assert not repo.changelog.filteredrevs |
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18 if repo.obsstore: |
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19 return frozenset(repo.revs('hidden()')) |
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20 return frozenset() |
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21 |
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22 def computeunserved(repo): |
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23 """compute the set of revision that should be filtered when used a server |
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24 |
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25 Secret and hidden changeset should not pretend to be here.""" |
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26 assert not repo.changelog.filteredrevs |
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27 # fast path in simple case to avoid impact of non optimised code |
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28 if phases.hassecret(repo) or repo.obsstore: |
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29 return frozenset(repo.revs('hidden() + secret()')) |
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30 return frozenset() |
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31 |
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32 # function to compute filtered set |
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33 filtertable = {'hidden': computehidden, |
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34 'unserved': computeunserved} |
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35 ### Nearest subset relation |
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36 # Nearest subset of filter X is a filter Y so that: |
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37 # * Y is included in X, |
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38 # * X - Y is as small as possible. |
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39 # This create and ordering used for branchmap purpose. |
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40 # the ordering may be partial |
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41 subsettable = {None: 'hidden', |
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42 'hidden': 'unserved'} |
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43 |
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44 def filteredrevs(repo, filtername): |
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45 """returns set of filtered revision for this filter name""" |
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46 if filtername not in repo.filteredrevcache: |
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47 func = filtertable[filtername] |
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48 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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49 return repo.filteredrevcache[filtername] |
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50 |
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51 class repoview(object): |
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52 """Provide a read/write view of a repo through a filtered changelog |
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53 |
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54 This object is used to access a filtered version of a repository without |
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55 altering the original repository object itself. We can not alter the |
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56 original object for two main reasons: |
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57 - It prevents the use of a repo with multiple filters at the same time. In |
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58 particular when multiple threads are involved. |
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59 - It makes scope of the filtering harder to control. |
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60 |
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61 This object behaves very closely to the original repository. All attribute |
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62 operations are done on the original repository: |
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63 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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64 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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65 - A deletion of `repoview.someattr` actually drops `someattr` |
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66 from `repo.__dict__`. |
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67 |
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68 The only exception is the `changelog` property. It is overridden to return |
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69 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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70 `filtername` attribute of the view control the revisions that need to be |
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71 filtered. (the fact the changelog is copied is an implementation detail). |
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72 |
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73 Unlike attributes, this object intercepts all method calls. This means that |
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74 all methods are run on the `repoview` object with the filtered `changelog` |
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75 property. For this purpose the simple `repoview` class must be mixed with |
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76 the actual class of the repository. This ensures that the resulting |
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77 `repoview` object have the very same methods than the repo object. This |
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78 leads to the property below. |
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79 |
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80 repoview.method() --> repo.__class__.method(repoview) |
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81 |
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82 The inheritance has to be done dynamically because `repo` can be of any |
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83 subclasses of `localrepo`. Eg: `bundlerepo` or `httprepo`. |
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84 """ |
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85 |
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86 def __init__(self, repo, filtername): |
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87 object.__setattr__(self, '_unfilteredrepo', repo) |
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88 object.__setattr__(self, 'filtername', filtername) |
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89 |
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90 # not a cacheproperty on purpose we shall implement a proper cache later |
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91 @property |
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92 def changelog(self): |
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93 """return a filtered version of the changeset |
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94 |
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95 this changelog must not be used for writing""" |
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96 # some cache may be implemented later |
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97 cl = copy.copy(self._unfilteredrepo.changelog) |
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98 cl.filteredrevs = filteredrevs(self._unfilteredrepo, self.filtername) |
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99 return cl |
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100 |
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101 def unfiltered(self): |
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102 """Return an unfiltered version of a repo""" |
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103 return self._unfilteredrepo |
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104 |
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105 def filtered(self, name): |
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106 """Return a filtered version of a repository""" |
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107 if name == self.filtername: |
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108 return self |
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109 return self.unfiltered().filtered(name) |
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110 |
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111 # everything access are forwarded to the proxied repo |
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112 def __getattr__(self, attr): |
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113 return getattr(self._unfilteredrepo, attr) |
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114 |
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115 def __setattr__(self, attr, value): |
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116 return setattr(self._unfilteredrepo, attr, value) |
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117 |
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118 def __delattr__(self, attr): |
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119 return delattr(self._unfilteredrepo, attr) |
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120 |
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121 # The `requirement` attribut is initialiazed during __init__. But |
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122 # __getattr__ won't be called as it also exists on the class. We need |
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123 # explicit forwarding to main repo here |
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124 @property |
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125 def requirements(self): |
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126 return self._unfilteredrepo.requirements |
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127 |