Mercurial > hg
annotate mercurial/tagmerge.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 | b77ff4fbe9ad |
children | 2372284d9457 |
rev | line source |
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1 # tagmerge.py - merge .hgtags files |
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2 # |
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3 # Copyright 2014 Angel Ezquerra <angel.ezquerra@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 # This module implements an automatic merge algorithm for mercurial's tag files |
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9 # |
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10 # The tagmerge algorithm implemented in this module is able to resolve most |
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11 # merge conflicts that currently would trigger a .hgtags merge conflict. The |
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12 # only case that it does not (and cannot) handle is that in which two tags point |
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13 # to different revisions on each merge parent _and_ their corresponding tag |
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14 # histories have the same rank (i.e. the same length). In all other cases the |
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15 # merge algorithm will choose the revision belonging to the parent with the |
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16 # highest ranked tag history. The merged tag history is the combination of both |
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17 # tag histories (special care is taken to try to combine common tag histories |
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18 # where possible). |
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19 # |
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20 # In addition to actually merging the tags from two parents, taking into |
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21 # account the base, the algorithm also tries to minimize the difference |
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22 # between the merged tag file and the first parent's tag file (i.e. it tries to |
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23 # make the merged tag order as as similar as possible to the first parent's tag |
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24 # file order). |
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25 # |
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26 # The algorithm works as follows: |
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27 # 1. read the tags from p1, p2 and the base |
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28 # - when reading the p1 tags, also get the line numbers associated to each |
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29 # tag node (these will be used to sort the merged tags in a way that |
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30 # minimizes the diff to p1). Ignore the file numbers when reading p2 and |
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31 # the base |
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32 # 2. recover the "lost tags" (i.e. those that are found in the base but not on |
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33 # p1 or p2) and add them back to p1 and/or p2 |
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34 # - at this point the only tags that are on p1 but not on p2 are those new |
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35 # tags that were introduced in p1. Same thing for the tags that are on p2 |
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36 # but not on p2 |
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37 # 3. take all tags that are only on p1 or only on p2 (but not on the base) |
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38 # - Note that these are the tags that were introduced between base and p1 |
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39 # and between base and p2, possibly on separate clones |
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40 # 4. for each tag found both on p1 and p2 perform the following merge algorithm: |
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41 # - the tags conflict if their tag "histories" have the same "rank" (i.e. |
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42 # length) AND the last (current) tag is NOT the same |
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43 # - for non conflicting tags: |
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44 # - choose which are the high and the low ranking nodes |
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45 # - the high ranking list of nodes is the one that is longer. |
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46 # In case of draw favor p1 |
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47 # - the merged node list is made of 3 parts: |
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48 # - first the nodes that are common to the beginning of both |
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49 # the low and the high ranking nodes |
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50 # - second the non common low ranking nodes |
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51 # - finally the non common high ranking nodes (with the last |
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52 # one being the merged tag node) |
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53 # - note that this is equivalent to putting the whole low ranking |
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54 # node list first, followed by the non common high ranking nodes |
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55 # - note that during the merge we keep the "node line numbers", which will |
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56 # be used when writing the merged tags to the tag file |
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57 # 5. write the merged tags taking into account to their positions in the first |
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58 # parent (i.e. try to keep the relative ordering of the nodes that come |
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59 # from p1). This minimizes the diff between the merged and the p1 tag files |
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60 # This is done by using the following algorithm |
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61 # - group the nodes for a given tag that must be written next to each other |
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62 # - A: nodes that come from consecutive lines on p1 |
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63 # - B: nodes that come from p2 (i.e. whose associated line number is |
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64 # None) and are next to one of the a nodes in A |
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65 # - each group is associated with a line number coming from p1 |
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66 # - generate a "tag block" for each of the groups |
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67 # - a tag block is a set of consecutive "node tag" lines belonging to |
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68 # the same tag and which will be written next to each other on the |
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69 # merged tags file |
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70 # - sort the "tag blocks" according to their associated number line |
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71 # - put blocks whose nodes come all from p2 first |
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72 # - write the tag blocks in the sorted order |
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73 |
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74 from __future__ import absolute_import |
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75 |
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76 from .i18n import _ |
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77 from .node import ( |
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78 hex, |
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79 nullid, |
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80 ) |
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81 from .import ( |
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82 tags as tagsmod, |
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83 util, |
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84 ) |
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85 |
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86 hexnullid = hex(nullid) |
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87 |
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88 def readtagsformerge(ui, repo, lines, fn='', keeplinenums=False): |
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89 '''read the .hgtags file into a structure that is suitable for merging |
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90 |
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91 Depending on the keeplinenums flag, clear the line numbers associated |
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92 with each tag. This is done because only the line numbers of the first |
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93 parent are useful for merging. |
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94 ''' |
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95 filetags = tagsmod._readtaghist(ui, repo, lines, fn=fn, recode=None, |
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96 calcnodelines=True)[1] |
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97 for tagname, taginfo in filetags.items(): |
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98 if not keeplinenums: |
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99 for el in taginfo: |
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100 el[1] = None |
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101 return filetags |
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102 |
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103 def grouptagnodesbyline(tagnodes): |
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104 ''' |
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105 Group nearby nodes (i.e. those that must be written next to each other) |
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106 |
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107 The input is a list of [node, position] pairs, corresponding to a given tag |
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108 The position is the line number where the node was found on the first parent |
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109 .hgtags file, or None for those nodes that came from the base or the second |
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110 parent .hgtags files. |
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111 |
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112 This function groups those [node, position] pairs, returning a list of |
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113 groups of nodes that must be written next to each other because their |
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114 positions are consecutive or have no position preference (because their |
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115 position is None). |
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116 |
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117 The result is a list of [position, [consecutive node list]] |
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118 ''' |
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119 firstlinenum = None |
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120 for hexnode, linenum in tagnodes: |
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121 firstlinenum = linenum |
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122 if firstlinenum is not None: |
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123 break |
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124 if firstlinenum is None: |
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125 return [[None, [el[0] for el in tagnodes]]] |
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126 tagnodes[0][1] = firstlinenum |
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127 groupednodes = [[firstlinenum, []]] |
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128 prevlinenum = firstlinenum |
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129 for hexnode, linenum in tagnodes: |
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130 if linenum is not None and linenum - prevlinenum > 1: |
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131 groupednodes.append([linenum, []]) |
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132 groupednodes[-1][1].append(hexnode) |
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133 if linenum is not None: |
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134 prevlinenum = linenum |
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135 return groupednodes |
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136 |
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137 def writemergedtags(fcd, mergedtags): |
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138 ''' |
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139 write the merged tags while trying to minimize the diff to the first parent |
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140 |
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141 This function uses the ordering info stored on the merged tags dict to |
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142 generate an .hgtags file which is correct (in the sense that its contents |
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143 correspond to the result of the tag merge) while also being as close as |
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144 possible to the first parent's .hgtags file. |
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145 ''' |
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146 # group the node-tag pairs that must be written next to each other |
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147 for tname, taglist in list(mergedtags.items()): |
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148 mergedtags[tname] = grouptagnodesbyline(taglist) |
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149 |
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150 # convert the grouped merged tags dict into a format that resembles the |
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151 # final .hgtags file (i.e. a list of blocks of 'node tag' pairs) |
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152 def taglist2string(tlist, tname): |
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153 return '\n'.join(['%s %s' % (hexnode, tname) for hexnode in tlist]) |
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154 |
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155 finaltags = [] |
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156 for tname, tags in mergedtags.items(): |
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157 for block in tags: |
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158 block[1] = taglist2string(block[1], tname) |
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159 finaltags += tags |
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160 |
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161 # the tag groups are linked to a "position" that can be used to sort them |
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162 # before writing them |
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163 # the position is calculated to ensure that the diff of the merged .hgtags |
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164 # file to the first parent's .hgtags file is as small as possible |
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165 finaltags.sort(key=lambda x: -1 if x[0] is None else x[0]) |
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166 |
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167 # finally we can join the sorted groups to get the final contents of the |
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168 # merged .hgtags file, and then write it to disk |
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169 mergedtagstring = '\n'.join([tags for rank, tags in finaltags if tags]) |
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170 fcd.write(mergedtagstring + '\n', fcd.flags()) |
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171 |
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172 def singletagmerge(p1nodes, p2nodes): |
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173 ''' |
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174 merge the nodes corresponding to a single tag |
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175 |
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176 Note that the inputs are lists of node-linenum pairs (i.e. not just lists |
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177 of nodes) |
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178 ''' |
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179 if not p2nodes: |
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180 return p1nodes |
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181 if not p1nodes: |
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182 return p2nodes |
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183 |
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184 # there is no conflict unless both tags point to different revisions |
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185 # and have a non identical tag history |
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186 p1currentnode = p1nodes[-1][0] |
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187 p2currentnode = p2nodes[-1][0] |
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188 if p1currentnode != p2currentnode and len(p1nodes) == len(p2nodes): |
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189 # cannot merge two tags with same rank pointing to different nodes |
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190 return None |
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191 |
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192 # which are the highest ranking (hr) / lowest ranking (lr) nodes? |
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193 if len(p1nodes) >= len(p2nodes): |
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194 hrnodes, lrnodes = p1nodes, p2nodes |
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195 else: |
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196 hrnodes, lrnodes = p2nodes, p1nodes |
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197 |
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198 # the lowest ranking nodes will be written first, followed by the highest |
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199 # ranking nodes |
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200 # to avoid unwanted tag rank explosion we try to see if there are some |
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201 # common nodes that can be written only once |
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202 commonidx = len(lrnodes) |
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203 for n in range(len(lrnodes)): |
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204 if hrnodes[n][0] != lrnodes[n][0]: |
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205 commonidx = n |
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206 break |
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207 lrnodes[n][1] = p1nodes[n][1] |
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208 |
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209 # the merged node list has 3 parts: |
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210 # - common nodes |
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211 # - non common lowest ranking nodes |
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212 # - non common highest ranking nodes |
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213 # note that the common nodes plus the non common lowest ranking nodes is the |
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214 # whole list of lr nodes |
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215 return lrnodes + hrnodes[commonidx:] |
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216 |
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217 def merge(repo, fcd, fco, fca): |
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218 ''' |
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219 Merge the tags of two revisions, taking into account the base tags |
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220 Try to minimize the diff between the merged tags and the first parent tags |
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221 ''' |
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222 ui = repo.ui |
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223 # read the p1, p2 and base tags |
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224 # only keep the line numbers for the p1 tags |
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225 p1tags = readtagsformerge( |
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226 ui, repo, fcd.data().splitlines(), fn="p1 tags", |
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227 keeplinenums=True) |
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228 p2tags = readtagsformerge( |
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229 ui, repo, fco.data().splitlines(), fn="p2 tags", |
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230 keeplinenums=False) |
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231 basetags = readtagsformerge( |
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232 ui, repo, fca.data().splitlines(), fn="base tags", |
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233 keeplinenums=False) |
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234 |
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235 # recover the list of "lost tags" (i.e. those that were found on the base |
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236 # revision but not on one of the revisions being merged) |
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237 basetagset = set(basetags) |
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238 for n, pntags in enumerate((p1tags, p2tags)): |
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239 pntagset = set(pntags) |
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240 pnlosttagset = basetagset - pntagset |
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241 for t in pnlosttagset: |
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242 pntags[t] = basetags[t] |
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243 if pntags[t][-1][0] != hexnullid: |
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244 pntags[t].append([hexnullid, None]) |
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245 |
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246 conflictedtags = [] # for reporting purposes |
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247 mergedtags = util.sortdict(p1tags) |
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248 # sortdict does not implement iteritems() |
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249 for tname, p2nodes in p2tags.items(): |
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250 if tname not in mergedtags: |
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251 mergedtags[tname] = p2nodes |
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252 continue |
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253 p1nodes = mergedtags[tname] |
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254 mergednodes = singletagmerge(p1nodes, p2nodes) |
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255 if mergednodes is None: |
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256 conflictedtags.append(tname) |
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257 continue |
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258 mergedtags[tname] = mergednodes |
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259 |
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260 if conflictedtags: |
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261 numconflicts = len(conflictedtags) |
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262 ui.warn(_('automatic .hgtags merge failed\n' |
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263 'the following %d tags are in conflict: %s\n') |
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264 % (numconflicts, ', '.join(sorted(conflictedtags)))) |
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265 return True, 1 |
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266 |
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267 writemergedtags(fcd, mergedtags) |
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268 ui.note(_('.hgtags merged successfully\n')) |
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269 return False, 0 |