Mercurial > hg
annotate mercurial/tagmerge.py @ 29268:f200b58497f1
sslutil: reference appropriate config section in messaging
Error messages reference the config section defining the host
fingerprint. Now that we have multiple sections where this config
setting could live, we need to point the user at the appropriate
one.
We default to the new "hostsecurity" section. But we will still
refer them to the "hostfingerprint" section if a value is defined
there.
There are some corner cases where the messaging might be off. e.g.
they could define a SHA-1 fingerprint in both sections. IMO the
messaging needs a massive overhaul. I plan to do this as part
of future refactoring to security settings.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 28 May 2016 12:58:46 -0700 |
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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 import operator |
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77 |
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78 from .i18n import _ |
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79 from .node import ( |
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80 hex, |
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81 nullid, |
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82 ) |
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83 from .import ( |
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84 tags as tagsmod, |
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85 util, |
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86 ) |
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87 |
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88 hexnullid = hex(nullid) |
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89 |
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90 def readtagsformerge(ui, repo, lines, fn='', keeplinenums=False): |
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91 '''read the .hgtags file into a structure that is suitable for merging |
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92 |
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93 Depending on the keeplinenums flag, clear the line numbers associated |
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94 with each tag. This is done because only the line numbers of the first |
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95 parent are useful for merging. |
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96 ''' |
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97 filetags = tagsmod._readtaghist(ui, repo, lines, fn=fn, recode=None, |
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98 calcnodelines=True)[1] |
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99 for tagname, taginfo in filetags.items(): |
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100 if not keeplinenums: |
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101 for el in taginfo: |
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102 el[1] = None |
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103 return filetags |
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104 |
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105 def grouptagnodesbyline(tagnodes): |
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106 ''' |
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107 Group nearby nodes (i.e. those that must be written next to each other) |
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108 |
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109 The input is a list of [node, position] pairs, corresponding to a given tag |
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110 The position is the line number where the node was found on the first parent |
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111 .hgtags file, or None for those nodes that came from the base or the second |
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112 parent .hgtags files. |
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113 |
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114 This function groups those [node, position] pairs, returning a list of |
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115 groups of nodes that must be written next to each other because their |
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116 positions are consecutive or have no position preference (because their |
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117 position is None). |
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118 |
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119 The result is a list of [position, [consecutive node list]] |
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120 ''' |
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121 firstlinenum = None |
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122 for hexnode, linenum in tagnodes: |
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123 firstlinenum = linenum |
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124 if firstlinenum is not None: |
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125 break |
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126 if firstlinenum is None: |
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127 return [[None, [el[0] for el in tagnodes]]] |
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128 tagnodes[0][1] = firstlinenum |
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129 groupednodes = [[firstlinenum, []]] |
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130 prevlinenum = firstlinenum |
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131 for hexnode, linenum in tagnodes: |
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132 if linenum is not None and linenum - prevlinenum > 1: |
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133 groupednodes.append([linenum, []]) |
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134 groupednodes[-1][1].append(hexnode) |
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135 if linenum is not None: |
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136 prevlinenum = linenum |
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137 return groupednodes |
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138 |
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139 def writemergedtags(repo, mergedtags): |
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140 ''' |
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141 write the merged tags while trying to minimize the diff to the first parent |
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142 |
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143 This function uses the ordering info stored on the merged tags dict to |
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144 generate an .hgtags file which is correct (in the sense that its contents |
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145 correspond to the result of the tag merge) while also being as close as |
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146 possible to the first parent's .hgtags file. |
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147 ''' |
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148 # group the node-tag pairs that must be written next to each other |
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149 for tname, taglist in mergedtags.items(): |
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150 mergedtags[tname] = grouptagnodesbyline(taglist) |
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151 |
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152 # convert the grouped merged tags dict into a format that resembles the |
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153 # final .hgtags file (i.e. a list of blocks of 'node tag' pairs) |
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154 def taglist2string(tlist, tname): |
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155 return '\n'.join(['%s %s' % (hexnode, tname) for hexnode in tlist]) |
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156 |
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157 finaltags = [] |
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158 for tname, tags in mergedtags.items(): |
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159 for block in tags: |
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160 block[1] = taglist2string(block[1], tname) |
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161 finaltags += tags |
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162 |
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163 # the tag groups are linked to a "position" that can be used to sort them |
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164 # before writing them |
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165 # the position is calculated to ensure that the diff of the merged .hgtags |
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166 # file to the first parent's .hgtags file is as small as possible |
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167 finaltags.sort(key=operator.itemgetter(0)) |
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168 |
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169 # finally we can join the sorted groups to get the final contents of the |
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170 # merged .hgtags file, and then write it to disk |
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171 mergedtagstring = '\n'.join([tags for rank, tags in finaltags if tags]) |
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172 fp = repo.wfile('.hgtags', 'wb') |
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173 fp.write(mergedtagstring + '\n') |
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174 fp.close() |
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175 |
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176 def singletagmerge(p1nodes, p2nodes): |
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177 ''' |
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178 merge the nodes corresponding to a single tag |
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179 |
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180 Note that the inputs are lists of node-linenum pairs (i.e. not just lists |
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181 of nodes) |
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182 ''' |
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183 if not p2nodes: |
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184 return p1nodes |
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185 if not p1nodes: |
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186 return p2nodes |
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187 |
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188 # there is no conflict unless both tags point to different revisions |
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189 # and have a non identical tag history |
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190 p1currentnode = p1nodes[-1][0] |
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191 p2currentnode = p2nodes[-1][0] |
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192 if p1currentnode != p2currentnode and len(p1nodes) == len(p2nodes): |
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193 # cannot merge two tags with same rank pointing to different nodes |
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194 return None |
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195 |
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196 # which are the highest ranking (hr) / lowest ranking (lr) nodes? |
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197 if len(p1nodes) >= len(p2nodes): |
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198 hrnodes, lrnodes = p1nodes, p2nodes |
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199 else: |
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200 hrnodes, lrnodes = p2nodes, p1nodes |
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201 |
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202 # the lowest ranking nodes will be written first, followed by the highest |
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203 # ranking nodes |
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204 # to avoid unwanted tag rank explosion we try to see if there are some |
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205 # common nodes that can be written only once |
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206 commonidx = len(lrnodes) |
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207 for n in range(len(lrnodes)): |
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208 if hrnodes[n][0] != lrnodes[n][0]: |
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209 commonidx = n |
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210 break |
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211 lrnodes[n][1] = p1nodes[n][1] |
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212 |
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213 # the merged node list has 3 parts: |
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214 # - common nodes |
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215 # - non common lowest ranking nodes |
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216 # - non common highest ranking nodes |
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217 # note that the common nodes plus the non common lowest ranking nodes is the |
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218 # whole list of lr nodes |
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219 return lrnodes + hrnodes[commonidx:] |
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220 |
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221 def merge(repo, fcd, fco, fca): |
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222 ''' |
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223 Merge the tags of two revisions, taking into account the base tags |
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224 Try to minimize the diff between the merged tags and the first parent tags |
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225 ''' |
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226 ui = repo.ui |
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227 # read the p1, p2 and base tags |
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228 # only keep the line numbers for the p1 tags |
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229 p1tags = readtagsformerge( |
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230 ui, repo, fcd.data().splitlines(), fn="p1 tags", |
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231 keeplinenums=True) |
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232 p2tags = readtagsformerge( |
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233 ui, repo, fco.data().splitlines(), fn="p2 tags", |
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234 keeplinenums=False) |
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235 basetags = readtagsformerge( |
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236 ui, repo, fca.data().splitlines(), fn="base tags", |
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237 keeplinenums=False) |
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238 |
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239 # recover the list of "lost tags" (i.e. those that were found on the base |
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240 # revision but not on one of the revisions being merged) |
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241 basetagset = set(basetags) |
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242 for n, pntags in enumerate((p1tags, p2tags)): |
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243 pntagset = set(pntags) |
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244 pnlosttagset = basetagset - pntagset |
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245 for t in pnlosttagset: |
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246 pntags[t] = basetags[t] |
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247 if pntags[t][-1][0] != hexnullid: |
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248 pntags[t].append([hexnullid, None]) |
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249 |
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250 conflictedtags = [] # for reporting purposes |
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251 mergedtags = util.sortdict(p1tags) |
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252 # sortdict does not implement iteritems() |
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253 for tname, p2nodes in p2tags.items(): |
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254 if tname not in mergedtags: |
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255 mergedtags[tname] = p2nodes |
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256 continue |
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257 p1nodes = mergedtags[tname] |
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258 mergednodes = singletagmerge(p1nodes, p2nodes) |
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259 if mergednodes is None: |
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260 conflictedtags.append(tname) |
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261 continue |
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262 mergedtags[tname] = mergednodes |
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263 |
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264 if conflictedtags: |
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265 numconflicts = len(conflictedtags) |
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266 ui.warn(_('automatic .hgtags merge failed\n' |
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267 'the following %d tags are in conflict: %s\n') |
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268 % (numconflicts, ', '.join(sorted(conflictedtags)))) |
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269 return True, 1 |
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270 |
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271 writemergedtags(repo, mergedtags) |
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272 ui.note(_('.hgtags merged successfully\n')) |
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273 return False, 0 |
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274 |