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1 | 1 | # repoview.py - Filtered view of a localrepo object |
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2 | 2 | # |
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3 | 3 | # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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4 | 4 | # Logilab SA <contact@logilab.fr> |
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5 | 5 | # |
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6 | 6 | # This software may be used and distributed according to the terms of the |
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7 | 7 | # GNU General Public License version 2 or any later version. |
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8 | 8 | |
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9 | 9 | import copy |
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10 | 10 | import phases |
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11 | 11 | import util |
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12 | 12 | import obsolete, revset |
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13 | 13 | |
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14 | 14 | |
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15 | 15 | def hideablerevs(repo): |
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16 | 16 | """Revisions candidates to be hidden |
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17 | 17 | |
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18 | 18 | This is a standalone function to help extensions to wrap it.""" |
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19 | 19 | return obsolete.getrevs(repo, 'obsolete') |
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20 | 20 | |
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21 | 21 | def computehidden(repo): |
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22 | 22 | """compute the set of hidden revision to filter |
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23 | 23 | |
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24 | 24 | During most operation hidden should be filtered.""" |
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25 | 25 | assert not repo.changelog.filteredrevs |
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26 | 26 | hideable = hideablerevs(repo) |
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27 | 27 | if hideable: |
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28 | 28 | cl = repo.changelog |
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29 | 29 | firsthideable = min(hideable) |
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30 | 30 | revs = cl.revs(start=firsthideable) |
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31 | 31 | blockers = [r for r in revset._children(repo, revs, hideable) |
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32 | 32 | if r not in hideable] |
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33 | 33 | for par in repo[None].parents(): |
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34 | 34 | blockers.append(par.rev()) |
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35 | 35 | for bm in repo._bookmarks.values(): |
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36 | 36 | blockers.append(repo[bm].rev()) |
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37 | 37 | blocked = cl.ancestors(blockers, inclusive=True) |
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38 | 38 | return frozenset(r for r in hideable if r not in blocked) |
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39 | 39 | return frozenset() |
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40 | 40 | |
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41 | 41 | def computeunserved(repo): |
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42 | 42 | """compute the set of revision that should be filtered when used a server |
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43 | 43 | |
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44 | 44 | Secret and hidden changeset should not pretend to be here.""" |
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45 | 45 | assert not repo.changelog.filteredrevs |
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46 | 46 | # fast path in simple case to avoid impact of non optimised code |
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47 | 47 | hiddens = filterrevs(repo, 'visible') |
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48 | 48 | if phases.hassecret(repo): |
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49 | 49 | cl = repo.changelog |
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50 | 50 | secret = phases.secret |
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51 | 51 | getphase = repo._phasecache.phase |
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52 | 52 | first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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53 | 53 | revs = cl.revs(start=first) |
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54 | 54 | secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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55 | 55 | return frozenset(hiddens | secrets) |
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56 | 56 | else: |
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57 | 57 | return hiddens |
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58 | 58 | |
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59 | 59 | def computemutable(repo): |
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60 | 60 | """compute the set of revision that should be filtered when used a server |
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61 | 61 | |
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62 | 62 | Secret and hidden changeset should not pretend to be here.""" |
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63 | 63 | assert not repo.changelog.filteredrevs |
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64 | 64 | # fast check to avoid revset call on huge repo |
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65 | 65 | if util.any(repo._phasecache.phaseroots[1:]): |
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66 | 66 | getphase = repo._phasecache.phase |
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67 | 67 | maymutable = filterrevs(repo, 'base') |
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68 | 68 | return frozenset(r for r in maymutable if getphase(repo, r)) |
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69 | 69 | return frozenset() |
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70 | 70 | |
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71 | 71 | def computeimpactable(repo): |
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72 | 72 | """Everything impactable by mutable revision |
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73 | 73 | |
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74 | 74 | The immutable filter still have some chance to get invalidated. This will |
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75 | 75 | happen when: |
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76 | 76 | |
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77 | 77 | - you garbage collect hidden changeset, |
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78 | 78 | - public phase is moved backward, |
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79 | 79 | - something is changed in the filtering (this could be fixed) |
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80 | 80 | |
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81 | 81 | This filter out any mutable changeset and any public changeset that may be |
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82 | 82 | impacted by something happening to a mutable revision. |
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83 | 83 | |
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84 | 84 | This is achieved by filtered everything with a revision number egal or |
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85 | 85 | higher than the first mutable changeset is filtered.""" |
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86 | 86 | assert not repo.changelog.filteredrevs |
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87 | 87 | cl = repo.changelog |
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88 | 88 | firstmutable = len(cl) |
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89 | 89 | for roots in repo._phasecache.phaseroots[1:]: |
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90 | 90 | if roots: |
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91 | 91 | firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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92 | 92 | # protect from nullrev root |
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93 | 93 | firstmutable = max(0, firstmutable) |
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94 | 94 | return frozenset(xrange(firstmutable, len(cl))) |
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95 | 95 | |
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96 | 96 | # function to compute filtered set |
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97 | # | |
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98 | # When addding a new filter you MUST update the table at: | |
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99 | # mercurial.branchmap.subsettable | |
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100 | # Otherwise your filter will have to recompute all its branches cache | |
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101 | # from scratch (very slow). | |
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97 | 102 | filtertable = {'visible': computehidden, |
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98 | 103 | 'served': computeunserved, |
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99 | 104 | 'immutable': computemutable, |
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100 | 105 | 'base': computeimpactable} |
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101 | 106 | |
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102 | 107 | def filterrevs(repo, filtername): |
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103 | 108 | """returns set of filtered revision for this filter name""" |
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104 | 109 | if filtername not in repo.filteredrevcache: |
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105 | 110 | func = filtertable[filtername] |
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106 | 111 | repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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107 | 112 | return repo.filteredrevcache[filtername] |
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108 | 113 | |
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109 | 114 | class repoview(object): |
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110 | 115 | """Provide a read/write view of a repo through a filtered changelog |
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111 | 116 | |
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112 | 117 | This object is used to access a filtered version of a repository without |
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113 | 118 | altering the original repository object itself. We can not alter the |
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114 | 119 | original object for two main reasons: |
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115 | 120 | - It prevents the use of a repo with multiple filters at the same time. In |
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116 | 121 | particular when multiple threads are involved. |
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117 | 122 | - It makes scope of the filtering harder to control. |
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118 | 123 | |
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119 | 124 | This object behaves very closely to the original repository. All attribute |
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120 | 125 | operations are done on the original repository: |
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121 | 126 | - An access to `repoview.someattr` actually returns `repo.someattr`, |
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122 | 127 | - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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123 | 128 | - A deletion of `repoview.someattr` actually drops `someattr` |
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124 | 129 | from `repo.__dict__`. |
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125 | 130 | |
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126 | 131 | The only exception is the `changelog` property. It is overridden to return |
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127 | 132 | a (surface) copy of `repo.changelog` with some revisions filtered. The |
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128 | 133 | `filtername` attribute of the view control the revisions that need to be |
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129 | 134 | filtered. (the fact the changelog is copied is an implementation detail). |
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130 | 135 | |
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131 | 136 | Unlike attributes, this object intercepts all method calls. This means that |
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132 | 137 | all methods are run on the `repoview` object with the filtered `changelog` |
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133 | 138 | property. For this purpose the simple `repoview` class must be mixed with |
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134 | 139 | the actual class of the repository. This ensures that the resulting |
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135 | 140 | `repoview` object have the very same methods than the repo object. This |
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136 | 141 | leads to the property below. |
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137 | 142 | |
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138 | 143 | repoview.method() --> repo.__class__.method(repoview) |
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139 | 144 | |
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140 | 145 | The inheritance has to be done dynamically because `repo` can be of any |
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141 | 146 | subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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142 | 147 | """ |
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143 | 148 | |
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144 | 149 | def __init__(self, repo, filtername): |
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145 | 150 | object.__setattr__(self, '_unfilteredrepo', repo) |
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146 | 151 | object.__setattr__(self, 'filtername', filtername) |
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147 | 152 | object.__setattr__(self, '_clcachekey', None) |
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148 | 153 | object.__setattr__(self, '_clcache', None) |
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149 | 154 | |
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150 | 155 | # not a propertycache on purpose we shall implement a proper cache later |
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151 | 156 | @property |
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152 | 157 | def changelog(self): |
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153 | 158 | """return a filtered version of the changeset |
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154 | 159 | |
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155 | 160 | this changelog must not be used for writing""" |
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156 | 161 | # some cache may be implemented later |
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157 | 162 | unfi = self._unfilteredrepo |
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158 | 163 | unfichangelog = unfi.changelog |
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159 | 164 | revs = filterrevs(unfi, self.filtername) |
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160 | 165 | cl = self._clcache |
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161 | 166 | newkey = (len(unfichangelog), unfichangelog.tip(), hash(revs)) |
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162 | 167 | if cl is not None: |
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163 | 168 | # we need to check curkey too for some obscure reason. |
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164 | 169 | # MQ test show a corruption of the underlying repo (in _clcache) |
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165 | 170 | # without change in the cachekey. |
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166 | 171 | oldfilter = cl.filteredrevs |
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167 | 172 | try: |
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168 | 173 | cl.filterrevs = () # disable filtering for tip |
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169 | 174 | curkey = (len(cl), cl.tip(), hash(oldfilter)) |
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170 | 175 | finally: |
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171 | 176 | cl.filteredrevs = oldfilter |
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172 | 177 | if newkey != self._clcachekey or newkey != curkey: |
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173 | 178 | cl = None |
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174 | 179 | # could have been made None by the previous if |
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175 | 180 | if cl is None: |
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176 | 181 | cl = copy.copy(unfichangelog) |
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177 | 182 | cl.filteredrevs = revs |
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178 | 183 | object.__setattr__(self, '_clcache', cl) |
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179 | 184 | object.__setattr__(self, '_clcachekey', newkey) |
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180 | 185 | return cl |
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181 | 186 | |
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182 | 187 | def unfiltered(self): |
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183 | 188 | """Return an unfiltered version of a repo""" |
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184 | 189 | return self._unfilteredrepo |
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185 | 190 | |
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186 | 191 | def filtered(self, name): |
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187 | 192 | """Return a filtered version of a repository""" |
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188 | 193 | if name == self.filtername: |
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189 | 194 | return self |
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190 | 195 | return self.unfiltered().filtered(name) |
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191 | 196 | |
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192 | 197 | # everything access are forwarded to the proxied repo |
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193 | 198 | def __getattr__(self, attr): |
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194 | 199 | return getattr(self._unfilteredrepo, attr) |
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195 | 200 | |
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196 | 201 | def __setattr__(self, attr, value): |
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197 | 202 | return setattr(self._unfilteredrepo, attr, value) |
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198 | 203 | |
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199 | 204 | def __delattr__(self, attr): |
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200 | 205 | return delattr(self._unfilteredrepo, attr) |
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201 | 206 | |
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202 | 207 | # The `requirements` attribute is initialized during __init__. But |
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203 | 208 | # __getattr__ won't be called as it also exists on the class. We need |
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204 | 209 | # explicit forwarding to main repo here |
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205 | 210 | @property |
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206 | 211 | def requirements(self): |
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207 | 212 | return self._unfilteredrepo.requirements |
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