Mercurial > hg
annotate mercurial/simplemerge.py @ 43131:c17a63eb5d4c
sidedata: apply basic but tight security around exchange
We don't currently have code to deal with exchange between repository using
sidedata and repository not using sidedata. Until we implement such code (eg:
dropping side data when pushing to a non-sidedata repo) we prevent the two kind
of repo to speak to each other. This is somewhere similar to what 'treemanifest'
does.
Note that sidedata exchange is broken unless one use changegroup v3 anyway. See
next changeset for details.
Differential Revision: https://phab.mercurial-scm.org/D6939
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 06 Oct 2019 23:36:51 -0400 |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 from .i18n import _ |
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22 from . import ( |
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23 error, |
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24 mdiff, |
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25 pycompat, |
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26 ) |
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27 from .utils import stringutil |
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28 |
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29 |
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30 class CantReprocessAndShowBase(Exception): |
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31 pass |
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32 |
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33 |
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34 def intersect(ra, rb): |
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35 """Given two ranges return the range where they intersect or None. |
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36 |
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37 >>> intersect((0, 10), (0, 6)) |
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38 (0, 6) |
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39 >>> intersect((0, 10), (5, 15)) |
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40 (5, 10) |
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41 >>> intersect((0, 10), (10, 15)) |
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42 >>> intersect((0, 9), (10, 15)) |
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43 >>> intersect((0, 9), (7, 15)) |
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44 (7, 9) |
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45 """ |
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46 assert ra[0] <= ra[1] |
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47 assert rb[0] <= rb[1] |
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48 |
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49 sa = max(ra[0], rb[0]) |
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50 sb = min(ra[1], rb[1]) |
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51 if sa < sb: |
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52 return sa, sb |
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53 else: |
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54 return None |
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55 |
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56 |
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57 def compare_range(a, astart, aend, b, bstart, bend): |
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58 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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59 """ |
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60 if (aend - astart) != (bend - bstart): |
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61 return False |
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62 for ia, ib in zip( |
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63 pycompat.xrange(astart, aend), pycompat.xrange(bstart, bend) |
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64 ): |
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65 if a[ia] != b[ib]: |
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66 return False |
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67 else: |
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68 return True |
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69 |
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70 |
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71 class Merge3Text(object): |
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72 """3-way merge of texts. |
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73 |
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74 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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75 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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76 |
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77 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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78 self.basetext = basetext |
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79 self.atext = atext |
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80 self.btext = btext |
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81 if base is None: |
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82 base = mdiff.splitnewlines(basetext) |
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83 if a is None: |
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84 a = mdiff.splitnewlines(atext) |
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85 if b is None: |
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86 b = mdiff.splitnewlines(btext) |
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87 self.base = base |
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88 self.a = a |
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89 self.b = b |
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90 |
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91 def merge_lines( |
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92 self, |
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93 name_a=None, |
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94 name_b=None, |
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95 name_base=None, |
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96 start_marker=b'<<<<<<<', |
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97 mid_marker=b'=======', |
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98 end_marker=b'>>>>>>>', |
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99 base_marker=None, |
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100 localorother=None, |
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101 minimize=False, |
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102 ): |
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103 """Return merge in cvs-like form. |
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104 """ |
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105 self.conflicts = False |
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106 newline = b'\n' |
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107 if len(self.a) > 0: |
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108 if self.a[0].endswith(b'\r\n'): |
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109 newline = b'\r\n' |
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110 elif self.a[0].endswith(b'\r'): |
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111 newline = b'\r' |
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112 if name_a and start_marker: |
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113 start_marker = start_marker + b' ' + name_a |
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114 if name_b and end_marker: |
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115 end_marker = end_marker + b' ' + name_b |
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116 if name_base and base_marker: |
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117 base_marker = base_marker + b' ' + name_base |
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118 merge_regions = self.merge_regions() |
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119 if minimize: |
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120 merge_regions = self.minimize(merge_regions) |
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121 for t in merge_regions: |
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122 what = t[0] |
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123 if what == b'unchanged': |
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124 for i in range(t[1], t[2]): |
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125 yield self.base[i] |
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126 elif what == b'a' or what == b'same': |
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127 for i in range(t[1], t[2]): |
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128 yield self.a[i] |
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129 elif what == b'b': |
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130 for i in range(t[1], t[2]): |
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131 yield self.b[i] |
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132 elif what == b'conflict': |
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133 if localorother == b'local': |
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134 for i in range(t[3], t[4]): |
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135 yield self.a[i] |
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136 elif localorother == b'other': |
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137 for i in range(t[5], t[6]): |
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138 yield self.b[i] |
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139 else: |
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140 self.conflicts = True |
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141 if start_marker is not None: |
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142 yield start_marker + newline |
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143 for i in range(t[3], t[4]): |
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144 yield self.a[i] |
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145 if base_marker is not None: |
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146 yield base_marker + newline |
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147 for i in range(t[1], t[2]): |
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148 yield self.base[i] |
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149 if mid_marker is not None: |
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150 yield mid_marker + newline |
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151 for i in range(t[5], t[6]): |
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152 yield self.b[i] |
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153 if end_marker is not None: |
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154 yield end_marker + newline |
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155 else: |
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156 raise ValueError(what) |
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157 |
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158 def merge_groups(self): |
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159 """Yield sequence of line groups. Each one is a tuple: |
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160 |
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161 'unchanged', lines |
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162 Lines unchanged from base |
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163 |
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164 'a', lines |
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165 Lines taken from a |
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166 |
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167 'same', lines |
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168 Lines taken from a (and equal to b) |
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169 |
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170 'b', lines |
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171 Lines taken from b |
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172 |
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173 'conflict', base_lines, a_lines, b_lines |
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174 Lines from base were changed to either a or b and conflict. |
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175 """ |
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176 for t in self.merge_regions(): |
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177 what = t[0] |
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178 if what == b'unchanged': |
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179 yield what, self.base[t[1] : t[2]] |
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180 elif what == b'a' or what == b'same': |
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181 yield what, self.a[t[1] : t[2]] |
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182 elif what == b'b': |
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183 yield what, self.b[t[1] : t[2]] |
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184 elif what == b'conflict': |
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185 yield ( |
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186 what, |
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187 self.base[t[1] : t[2]], |
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188 self.a[t[3] : t[4]], |
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189 self.b[t[5] : t[6]], |
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190 ) |
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191 else: |
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192 raise ValueError(what) |
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193 |
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194 def merge_regions(self): |
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195 """Return sequences of matching and conflicting regions. |
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196 |
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197 This returns tuples, where the first value says what kind we |
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198 have: |
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199 |
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200 'unchanged', start, end |
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201 Take a region of base[start:end] |
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202 |
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203 'same', astart, aend |
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204 b and a are different from base but give the same result |
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205 |
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206 'a', start, end |
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207 Non-clashing insertion from a[start:end] |
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208 |
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209 'conflict', zstart, zend, astart, aend, bstart, bend |
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210 Conflict between a and b, with z as common ancestor |
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211 |
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212 Method is as follows: |
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213 |
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214 The two sequences align only on regions which match the base |
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215 and both descendants. These are found by doing a two-way diff |
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216 of each one against the base, and then finding the |
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217 intersections between those regions. These "sync regions" |
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218 are by definition unchanged in both and easily dealt with. |
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219 |
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220 The regions in between can be in any of three cases: |
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221 conflicted, or changed on only one side. |
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222 """ |
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223 |
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224 # section a[0:ia] has been disposed of, etc |
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225 iz = ia = ib = 0 |
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226 |
16683 | 227 for region in self.find_sync_regions(): |
228 zmatch, zend, amatch, aend, bmatch, bend = region | |
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229 # print 'match base [%d:%d]' % (zmatch, zend) |
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230 |
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231 matchlen = zend - zmatch |
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232 assert matchlen >= 0 |
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233 assert matchlen == (aend - amatch) |
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234 assert matchlen == (bend - bmatch) |
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235 |
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236 len_a = amatch - ia |
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237 len_b = bmatch - ib |
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238 len_base = zmatch - iz |
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239 assert len_a >= 0 |
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240 assert len_b >= 0 |
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241 assert len_base >= 0 |
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242 |
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243 # print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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244 |
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245 if len_a or len_b: |
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246 # try to avoid actually slicing the lists |
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247 equal_a = compare_range( |
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248 self.a, ia, amatch, self.base, iz, zmatch |
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249 ) |
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250 equal_b = compare_range( |
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251 self.b, ib, bmatch, self.base, iz, zmatch |
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252 ) |
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253 same = compare_range(self.a, ia, amatch, self.b, ib, bmatch) |
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254 |
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255 if same: |
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256 yield b'same', ia, amatch |
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257 elif equal_a and not equal_b: |
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258 yield b'b', ib, bmatch |
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259 elif equal_b and not equal_a: |
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260 yield b'a', ia, amatch |
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261 elif not equal_a and not equal_b: |
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262 yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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263 else: |
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264 raise AssertionError(b"can't handle a=b=base but unmatched") |
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265 |
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266 ia = amatch |
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267 ib = bmatch |
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268 iz = zmatch |
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269 |
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270 # if the same part of the base was deleted on both sides |
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271 # that's OK, we can just skip it. |
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272 |
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273 if matchlen > 0: |
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274 assert ia == amatch |
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275 assert ib == bmatch |
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276 assert iz == zmatch |
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277 |
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278 yield b'unchanged', zmatch, zend |
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279 iz = zend |
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280 ia = aend |
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281 ib = bend |
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282 |
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283 def minimize(self, merge_regions): |
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284 """Trim conflict regions of lines where A and B sides match. |
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285 |
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286 Lines where both A and B have made the same changes at the beginning |
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287 or the end of each merge region are eliminated from the conflict |
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288 region and are instead considered the same. |
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289 """ |
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290 for region in merge_regions: |
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291 if region[0] != b"conflict": |
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292 yield region |
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293 continue |
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294 issue, z1, z2, a1, a2, b1, b2 = region |
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295 alen = a2 - a1 |
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296 blen = b2 - b1 |
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297 |
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298 # find matches at the front |
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299 ii = 0 |
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300 while ( |
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301 ii < alen and ii < blen and self.a[a1 + ii] == self.b[b1 + ii] |
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302 ): |
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303 ii += 1 |
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304 startmatches = ii |
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305 |
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306 # find matches at the end |
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307 ii = 0 |
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308 while ( |
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309 ii < alen |
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310 and ii < blen |
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311 and self.a[a2 - ii - 1] == self.b[b2 - ii - 1] |
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312 ): |
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313 ii += 1 |
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314 endmatches = ii |
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315 |
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316 if startmatches > 0: |
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317 yield b'same', a1, a1 + startmatches |
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318 |
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319 yield ( |
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320 b'conflict', |
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321 z1, |
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322 z2, |
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323 a1 + startmatches, |
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324 a2 - endmatches, |
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325 b1 + startmatches, |
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326 b2 - endmatches, |
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327 ) |
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328 |
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329 if endmatches > 0: |
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330 yield b'same', a2 - endmatches, a2 |
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331 |
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332 def find_sync_regions(self): |
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333 """Return a list of sync regions, where both descendants match the base. |
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334 |
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335 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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336 always a zero-length sync region at the end of all the files. |
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337 """ |
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338 |
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339 ia = ib = 0 |
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340 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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341 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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342 len_a = len(amatches) |
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343 len_b = len(bmatches) |
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344 |
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345 sl = [] |
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346 |
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347 while ia < len_a and ib < len_b: |
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348 abase, amatch, alen = amatches[ia] |
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349 bbase, bmatch, blen = bmatches[ib] |
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350 |
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351 # there is an unconflicted block at i; how long does it |
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352 # extend? until whichever one ends earlier. |
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353 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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354 if i: |
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355 intbase = i[0] |
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356 intend = i[1] |
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357 intlen = intend - intbase |
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358 |
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359 # found a match of base[i[0], i[1]]; this may be less than |
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360 # the region that matches in either one |
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361 assert intlen <= alen |
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362 assert intlen <= blen |
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363 assert abase <= intbase |
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364 assert bbase <= intbase |
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365 |
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366 asub = amatch + (intbase - abase) |
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367 bsub = bmatch + (intbase - bbase) |
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368 aend = asub + intlen |
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369 bend = bsub + intlen |
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370 |
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371 assert self.base[intbase:intend] == self.a[asub:aend], ( |
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372 self.base[intbase:intend], |
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373 self.a[asub:aend], |
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374 ) |
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375 |
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376 assert self.base[intbase:intend] == self.b[bsub:bend] |
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377 |
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378 sl.append((intbase, intend, asub, aend, bsub, bend)) |
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379 |
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380 # advance whichever one ends first in the base text |
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381 if (abase + alen) < (bbase + blen): |
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382 ia += 1 |
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383 else: |
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384 ib += 1 |
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385 |
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386 intbase = len(self.base) |
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387 abase = len(self.a) |
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388 bbase = len(self.b) |
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389 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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390 |
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391 return sl |
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392 |
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393 def find_unconflicted(self): |
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394 """Return a list of ranges in base that are not conflicted.""" |
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395 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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396 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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397 |
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398 unc = [] |
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399 |
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400 while am and bm: |
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401 # there is an unconflicted block at i; how long does it |
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402 # extend? until whichever one ends earlier. |
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403 a1 = am[0][0] |
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404 a2 = a1 + am[0][2] |
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405 b1 = bm[0][0] |
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406 b2 = b1 + bm[0][2] |
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407 i = intersect((a1, a2), (b1, b2)) |
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408 if i: |
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409 unc.append(i) |
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410 |
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411 if a2 < b2: |
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412 del am[0] |
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413 else: |
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414 del bm[0] |
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415 |
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416 return unc |
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417 |
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418 |
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419 def _verifytext(text, path, ui, opts): |
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420 """verifies that text is non-binary (unless opts[text] is passed, |
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421 then we just warn)""" |
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422 if stringutil.binary(text): |
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423 msg = _(b"%s looks like a binary file.") % path |
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424 if not opts.get(b'quiet'): |
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425 ui.warn(_(b'warning: %s\n') % msg) |
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426 if not opts.get(b'text'): |
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427 raise error.Abort(msg) |
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428 return text |
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429 |
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430 |
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431 def _picklabels(defaults, overrides): |
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432 if len(overrides) > 3: |
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433 raise error.Abort(_(b"can only specify three labels.")) |
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434 result = defaults[:] |
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435 for i, override in enumerate(overrides): |
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436 result[i] = override |
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437 return result |
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438 |
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439 |
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440 def simplemerge(ui, localctx, basectx, otherctx, **opts): |
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441 """Performs the simplemerge algorithm. |
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442 |
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443 The merged result is written into `localctx`. |
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444 """ |
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445 opts = pycompat.byteskwargs(opts) |
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446 |
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447 def readctx(ctx): |
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448 # Merges were always run in the working copy before, which means |
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449 # they used decoded data, if the user defined any repository |
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450 # filters. |
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451 # |
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452 # Maintain that behavior today for BC, though perhaps in the future |
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453 # it'd be worth considering whether merging encoded data (what the |
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454 # repository usually sees) might be more useful. |
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455 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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456 |
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457 mode = opts.get(b'mode', b'merge') |
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458 name_a, name_b, name_base = None, None, None |
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459 if mode != b'union': |
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460 name_a, name_b, name_base = _picklabels( |
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461 [localctx.path(), otherctx.path(), None], opts.get(b'label', []) |
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462 ) |
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463 |
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464 try: |
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465 localtext = readctx(localctx) |
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466 basetext = readctx(basectx) |
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467 othertext = readctx(otherctx) |
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468 except error.Abort: |
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469 return 1 |
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470 |
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471 m3 = Merge3Text(basetext, localtext, othertext) |
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472 extrakwargs = { |
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473 b"localorother": opts.get(b"localorother", None), |
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474 b'minimize': True, |
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475 } |
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476 if mode == b'union': |
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477 extrakwargs[b'start_marker'] = None |
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478 extrakwargs[b'mid_marker'] = None |
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479 extrakwargs[b'end_marker'] = None |
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480 elif name_base is not None: |
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481 extrakwargs[b'base_marker'] = b'|||||||' |
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482 extrakwargs[b'name_base'] = name_base |
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483 extrakwargs[b'minimize'] = False |
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484 |
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485 mergedtext = b"" |
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486 for line in m3.merge_lines( |
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487 name_a=name_a, name_b=name_b, **pycompat.strkwargs(extrakwargs) |
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488 ): |
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489 if opts.get(b'print'): |
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490 ui.fout.write(line) |
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491 else: |
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492 mergedtext += line |
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493 |
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494 if not opts.get(b'print'): |
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495 localctx.write(mergedtext, localctx.flags()) |
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496 |
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497 if m3.conflicts and not mode == b'union': |
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498 return 1 |