Mercurial > hg
annotate mercurial/repoview.py @ 40626:87a872555e90
revlog: detect incomplete revlog reads
_readsegment() is supposed to return N bytes of revlog revision
data starting at a file offset. Surprisingly, its behavior before
this patch never verified that it actually read and returned N
bytes! Instead, it would perform the read(), then return whatever
data was available. And even more surprisingly, nothing in the
call chain appears to have been validating that it received all
the data it was expecting.
This behavior could lead to partial or incomplete revision chunks
being operated on. This could result in e.g. cached deltas being
applied against incomplete base revisions. The delta application
process would happily perform this operation. Only hash
verification would detect the corruption and save us.
This commit changes the behavior of raw revlog reading to validate
that we actually read() the number of bytes that were requested.
We will raise a more specific error faster, rather than possibly
have it go undetected or manifest later in the call stack, at
delta application or hash verification.
Differential Revision: https://phab.mercurial-scm.org/D5266
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 13 Nov 2018 12:30:59 -0800 |
parents | 06c976acc581 |
children | bc15e37ecc16 |
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 from __future__ import absolute_import |
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10 |
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11 import copy |
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12 import weakref |
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13 |
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14 from .node import nullrev |
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15 from . import ( |
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16 obsolete, |
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17 phases, |
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18 pycompat, |
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19 tags as tagsmod, |
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20 ) |
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21 |
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22 def hideablerevs(repo): |
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23 """Revision candidates to be hidden |
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24 |
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25 This is a standalone function to allow extensions to wrap it. |
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26 |
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27 Because we use the set of immutable changesets as a fallback subset in |
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28 branchmap (see mercurial.branchmap.subsettable), you cannot set "public" |
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29 changesets as "hideable". Doing so would break multiple code assertions and |
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30 lead to crashes.""" |
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31 obsoletes = obsolete.getrevs(repo, 'obsolete') |
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32 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) |
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33 internals = frozenset(internals) |
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34 return obsoletes | internals |
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35 |
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36 def pinnedrevs(repo): |
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37 """revisions blocking hidden changesets from being filtered |
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38 """ |
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39 |
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40 cl = repo.changelog |
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41 pinned = set() |
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42 pinned.update([par.rev() for par in repo[None].parents()]) |
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43 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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44 |
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45 tags = {} |
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46 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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47 if tags: |
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48 rev, nodemap = cl.rev, cl.nodemap |
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49 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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50 return pinned |
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51 |
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52 |
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53 def _revealancestors(pfunc, hidden, revs): |
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54 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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55 from 'hidden' |
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56 |
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57 - pfunc(r): a funtion returning parent of 'r', |
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58 - hidden: the (preliminary) hidden revisions, to be updated |
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59 - revs: iterable of revnum, |
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60 |
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61 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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62 *not* revealed) |
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63 """ |
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64 stack = list(revs) |
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65 while stack: |
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66 for p in pfunc(stack.pop()): |
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67 if p != nullrev and p in hidden: |
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68 hidden.remove(p) |
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69 stack.append(p) |
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70 |
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71 def computehidden(repo, visibilityexceptions=None): |
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72 """compute the set of hidden revision to filter |
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73 |
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74 During most operation hidden should be filtered.""" |
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75 assert not repo.changelog.filteredrevs |
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76 |
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77 hidden = hideablerevs(repo) |
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78 if hidden: |
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79 hidden = set(hidden - pinnedrevs(repo)) |
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80 if visibilityexceptions: |
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81 hidden -= visibilityexceptions |
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82 pfunc = repo.changelog.parentrevs |
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83 mutable = repo._phasecache.getrevset(repo, phases.mutablephases) |
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84 |
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85 visible = mutable - hidden |
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86 _revealancestors(pfunc, hidden, visible) |
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87 return frozenset(hidden) |
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88 |
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89 def computeunserved(repo, visibilityexceptions=None): |
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90 """compute the set of revision that should be filtered when used a server |
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91 |
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92 Secret and hidden changeset should not pretend to be here.""" |
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93 assert not repo.changelog.filteredrevs |
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94 # fast path in simple case to avoid impact of non optimised code |
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95 hiddens = filterrevs(repo, 'visible') |
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96 if phases.hassecret(repo): |
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97 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) |
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98 return frozenset(hiddens | frozenset(secrets)) |
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99 else: |
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100 return hiddens |
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101 |
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102 def computemutable(repo, visibilityexceptions=None): |
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103 assert not repo.changelog.filteredrevs |
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104 # fast check to avoid revset call on huge repo |
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105 if any(repo._phasecache.phaseroots[1:]): |
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106 getphase = repo._phasecache.phase |
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107 maymutable = filterrevs(repo, 'base') |
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108 return frozenset(r for r in maymutable if getphase(repo, r)) |
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109 return frozenset() |
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110 |
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111 def computeimpactable(repo, visibilityexceptions=None): |
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112 """Everything impactable by mutable revision |
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113 |
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114 The immutable filter still have some chance to get invalidated. This will |
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115 happen when: |
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116 |
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117 - you garbage collect hidden changeset, |
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118 - public phase is moved backward, |
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119 - something is changed in the filtering (this could be fixed) |
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120 |
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121 This filter out any mutable changeset and any public changeset that may be |
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122 impacted by something happening to a mutable revision. |
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123 |
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124 This is achieved by filtered everything with a revision number egal or |
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125 higher than the first mutable changeset is filtered.""" |
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126 assert not repo.changelog.filteredrevs |
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127 cl = repo.changelog |
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128 firstmutable = len(cl) |
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129 for roots in repo._phasecache.phaseroots[1:]: |
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130 if roots: |
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131 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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132 # protect from nullrev root |
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133 firstmutable = max(0, firstmutable) |
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134 return frozenset(pycompat.xrange(firstmutable, len(cl))) |
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135 |
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136 # function to compute filtered set |
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137 # |
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138 # When adding a new filter you MUST update the table at: |
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139 # mercurial.branchmap.subsettable |
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140 # Otherwise your filter will have to recompute all its branches cache |
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141 # from scratch (very slow). |
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142 filtertable = {'visible': computehidden, |
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143 'visible-hidden': computehidden, |
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144 'served': computeunserved, |
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145 'immutable': computemutable, |
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146 'base': computeimpactable} |
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147 |
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148 def filterrevs(repo, filtername, visibilityexceptions=None): |
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149 """returns set of filtered revision for this filter name |
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150 |
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151 visibilityexceptions is a set of revs which must are exceptions for |
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152 hidden-state and must be visible. They are dynamic and hence we should not |
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153 cache it's result""" |
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154 if filtername not in repo.filteredrevcache: |
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155 func = filtertable[filtername] |
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156 if visibilityexceptions: |
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157 return func(repo.unfiltered, visibilityexceptions) |
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158 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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159 return repo.filteredrevcache[filtername] |
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160 |
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161 class repoview(object): |
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162 """Provide a read/write view of a repo through a filtered changelog |
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163 |
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164 This object is used to access a filtered version of a repository without |
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165 altering the original repository object itself. We can not alter the |
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166 original object for two main reasons: |
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167 - It prevents the use of a repo with multiple filters at the same time. In |
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168 particular when multiple threads are involved. |
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169 - It makes scope of the filtering harder to control. |
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170 |
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171 This object behaves very closely to the original repository. All attribute |
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172 operations are done on the original repository: |
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173 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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174 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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175 - A deletion of `repoview.someattr` actually drops `someattr` |
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176 from `repo.__dict__`. |
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177 |
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178 The only exception is the `changelog` property. It is overridden to return |
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179 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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180 `filtername` attribute of the view control the revisions that need to be |
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181 filtered. (the fact the changelog is copied is an implementation detail). |
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182 |
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183 Unlike attributes, this object intercepts all method calls. This means that |
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184 all methods are run on the `repoview` object with the filtered `changelog` |
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185 property. For this purpose the simple `repoview` class must be mixed with |
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186 the actual class of the repository. This ensures that the resulting |
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187 `repoview` object have the very same methods than the repo object. This |
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188 leads to the property below. |
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189 |
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190 repoview.method() --> repo.__class__.method(repoview) |
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191 |
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192 The inheritance has to be done dynamically because `repo` can be of any |
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193 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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194 """ |
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195 |
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196 def __init__(self, repo, filtername, visibilityexceptions=None): |
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197 object.__setattr__(self, r'_unfilteredrepo', repo) |
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198 object.__setattr__(self, r'filtername', filtername) |
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199 object.__setattr__(self, r'_clcachekey', None) |
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200 object.__setattr__(self, r'_clcache', None) |
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201 # revs which are exceptions and must not be hidden |
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202 object.__setattr__(self, r'_visibilityexceptions', |
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203 visibilityexceptions) |
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204 |
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205 # not a propertycache on purpose we shall implement a proper cache later |
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206 @property |
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207 def changelog(self): |
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208 """return a filtered version of the changeset |
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209 |
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210 this changelog must not be used for writing""" |
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211 # some cache may be implemented later |
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212 unfi = self._unfilteredrepo |
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213 unfichangelog = unfi.changelog |
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214 # bypass call to changelog.method |
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215 unfiindex = unfichangelog.index |
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216 unfilen = len(unfiindex) |
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217 unfinode = unfiindex[unfilen - 1][7] |
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218 |
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219 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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220 cl = self._clcache |
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221 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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222 # if cl.index is not unfiindex, unfi.changelog would be |
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223 # recreated, and our clcache refers to garbage object |
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224 if (cl is not None and |
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225 (cl.index is not unfiindex or newkey != self._clcachekey)): |
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226 cl = None |
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227 # could have been made None by the previous if |
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228 if cl is None: |
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229 cl = copy.copy(unfichangelog) |
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230 cl.filteredrevs = revs |
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231 object.__setattr__(self, r'_clcache', cl) |
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232 object.__setattr__(self, r'_clcachekey', newkey) |
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233 return cl |
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234 |
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235 def unfiltered(self): |
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236 """Return an unfiltered version of a repo""" |
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237 return self._unfilteredrepo |
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238 |
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239 def filtered(self, name, visibilityexceptions=None): |
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240 """Return a filtered version of a repository""" |
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241 if name == self.filtername and not visibilityexceptions: |
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242 return self |
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243 return self.unfiltered().filtered(name, visibilityexceptions) |
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244 |
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245 def __repr__(self): |
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246 return r'<%s:%s %r>' % (self.__class__.__name__, |
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247 pycompat.sysstr(self.filtername), |
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248 self.unfiltered()) |
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249 |
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250 # everything access are forwarded to the proxied repo |
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251 def __getattr__(self, attr): |
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252 return getattr(self._unfilteredrepo, attr) |
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253 |
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254 def __setattr__(self, attr, value): |
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255 return setattr(self._unfilteredrepo, attr, value) |
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256 |
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257 def __delattr__(self, attr): |
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258 return delattr(self._unfilteredrepo, attr) |
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259 |
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260 # Python <3.4 easily leaks types via __mro__. See |
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261 # https://bugs.python.org/issue17950. We cache dynamically created types |
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262 # so they won't be leaked on every invocation of repo.filtered(). |
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263 _filteredrepotypes = weakref.WeakKeyDictionary() |
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264 |
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265 def newtype(base): |
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266 """Create a new type with the repoview mixin and the given base class""" |
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267 if base not in _filteredrepotypes: |
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268 class filteredrepo(repoview, base): |
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269 pass |
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270 _filteredrepotypes[base] = filteredrepo |
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271 return _filteredrepotypes[base] |