Mercurial > hg
annotate tests/test-merge1.t @ 23702:c48924787eaa
filectx.parents: enforce changeid of parent to be in own changectx ancestors
Because of the way filenodes are computed, you can have multiple changesets
"introducing" the same file revision. For example, in the changeset graph
below, changeset 2 and 3 both change a file -to- and -from- the same content.
o 3: content = new
|
| o 2: content = new
|/
o 1: content = old
In such cases, the file revision is create once, when 2 is added, and just reused
for 3. So the file change in '3' (from "old" to "new)" has no linkrev pointing
to it). We'll call this situation "linkrev-shadowing". As the linkrev is used for
optimization purposes when walking a file history, the linkrev-shadowing
results in an unexpected jump to another branch during such a walk.. This leads to
multiple bugs with log, annotate and rename detection.
One element to fix such bugs is to ensure that walking the file history sticks on
the same topology as the changeset's history. For this purpose, we extend the
logic in 'basefilectx.parents' so that it always defines the proper changeset
to associate the parent file revision with. This "proper" changeset has to be an
ancestor of the changeset associated with the child file revision.
This logic is performed in the '_adjustlinkrev' function. This function is
given the starting changeset and all the information regarding the parent file
revision. If the linkrev for the file revision is an ancestor of the starting
changeset, the linkrev is valid and will be used. If it is not, we detected a
topological jump caused by linkrev shadowing, we are going to walk the
ancestors of the starting changeset until we find one setting the file to the
revision we are trying to create.
The performance impact appears acceptable:
- We are walking the changelog once for each filelog traversal (as there should
be no overlap between searches),
- changelog traversal itself is fairly cheap, compared to what is likely going
to be perform on the result on the filelog traversal,
- We only touch the manifest for ancestors touching the file, And such
changesets are likely to be the one introducing the file. (except in
pathological cases involving merge),
- We use manifest diff instead of full manifest unpacking to check manifest
content, so it does not involve applying multiple diffs in most case.
- linkrev shadowing is not the common case.
Tests for fixed issues in log, annotate and rename detection have been
added.
But this changeset does not solve all problems. It fixes -ancestry-
computation, but if the linkrev-shadowed changesets is the starting one, we'll
still get things wrong. We'll have to fix the bootstrapping of such operations
in a later changeset. Also, the usage of `hg log FILE` without --follow still
has issues with linkrev pointing to hidden changesets, because it relies on the
`filelog` revset which implement its own traversal logic that is still to be
fixed.
Thanks goes to:
- Matt Mackall: for nudging me in the right direction
- Julien Cristau and RĂ©mi Cardona: for keep telling me linkrev bug were an
evolution show stopper for 3 years.
- Durham Goode: for finding a new linkrev issue every few weeks
- Mads Kiilerich: for that last rename bug who raise this topic over my
anoyance limit.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
---|---|
date | Tue, 23 Dec 2014 15:30:38 -0800 |
parents | 94c394653b2a |
children | 1ef96a3b8b89 |
rev | line source |
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1 $ cat <<EOF > merge |
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2 > import sys, os |
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3 > |
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4 > try: |
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5 > import msvcrt |
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6 > msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY) |
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7 > msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY) |
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8 > except ImportError: |
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9 > pass |
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10 > |
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11 > print "merging for", os.path.basename(sys.argv[1]) |
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12 > EOF |
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13 $ HGMERGE="python ../merge"; export HGMERGE |
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14 |
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15 $ hg init t |
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16 $ cd t |
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17 $ echo This is file a1 > a |
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18 $ hg add a |
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19 $ hg commit -m "commit #0" |
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20 $ echo This is file b1 > b |
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21 $ hg add b |
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22 $ hg commit -m "commit #1" |
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23 |
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24 $ hg update 0 |
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25 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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26 |
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27 Test interrupted updates by exploiting our non-handling of directory collisions |
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28 |
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29 $ mkdir b |
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30 $ hg up |
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31 abort: *: '$TESTTMP/t/b' (glob) |
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32 [255] |
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33 $ hg ci |
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34 abort: last update was interrupted |
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35 (use 'hg update' to get a consistent checkout) |
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36 [255] |
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37 $ hg sum |
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38 parent: 0:538afb845929 |
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39 commit #0 |
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40 branch: default |
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41 commit: (interrupted update) |
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42 update: 1 new changesets (update) |
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43 $ rmdir b |
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44 $ hg up |
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45 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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46 $ hg sum |
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47 parent: 1:b8bb4a988f25 tip |
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48 commit #1 |
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49 branch: default |
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50 commit: (clean) |
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51 update: (current) |
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52 |
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53 Prepare a basic merge |
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54 |
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55 $ hg up 0 |
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56 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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57 $ echo This is file c1 > c |
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58 $ hg add c |
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59 $ hg commit -m "commit #2" |
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60 created new head |
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61 $ echo This is file b1 > b |
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62 no merges expected |
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63 $ hg merge -P 1 |
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64 changeset: 1:b8bb4a988f25 |
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65 user: test |
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66 date: Thu Jan 01 00:00:00 1970 +0000 |
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67 summary: commit #1 |
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68 |
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69 $ hg merge 1 |
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70 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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71 (branch merge, don't forget to commit) |
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72 $ hg diff --nodates |
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73 diff -r 49035e18a8e6 b |
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74 --- /dev/null |
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75 +++ b/b |
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76 @@ -0,0 +1,1 @@ |
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77 +This is file b1 |
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78 $ hg status |
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79 M b |
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80 $ cd ..; rm -r t |
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81 |
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82 $ hg init t |
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83 $ cd t |
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84 $ echo This is file a1 > a |
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85 $ hg add a |
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86 $ hg commit -m "commit #0" |
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87 $ echo This is file b1 > b |
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88 $ hg add b |
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89 $ hg commit -m "commit #1" |
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90 |
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91 $ hg update 0 |
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92 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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93 $ echo This is file c1 > c |
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94 $ hg add c |
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95 $ hg commit -m "commit #2" |
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96 created new head |
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97 $ echo This is file b2 > b |
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98 merge should fail |
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99 $ hg merge 1 |
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100 b: untracked file differs |
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101 abort: untracked files in working directory differ from files in requested revision |
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102 [255] |
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103 merge of b expected |
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104 $ hg merge -f 1 |
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105 merging b |
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106 merging for b |
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107 0 files updated, 1 files merged, 0 files removed, 0 files unresolved |
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108 (branch merge, don't forget to commit) |
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109 $ hg diff --nodates |
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110 diff -r 49035e18a8e6 b |
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111 --- /dev/null |
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112 +++ b/b |
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113 @@ -0,0 +1,1 @@ |
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114 +This is file b2 |
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115 $ hg status |
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116 M b |
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117 $ cd ..; rm -r t |
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118 |
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119 $ hg init t |
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120 $ cd t |
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121 $ echo This is file a1 > a |
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122 $ hg add a |
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123 $ hg commit -m "commit #0" |
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124 $ echo This is file b1 > b |
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125 $ hg add b |
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126 $ hg commit -m "commit #1" |
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127 $ echo This is file b22 > b |
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128 $ hg commit -m "commit #2" |
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129 $ hg update 1 |
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130 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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131 $ echo This is file c1 > c |
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132 $ hg add c |
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133 $ hg commit -m "commit #3" |
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134 created new head |
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135 |
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136 Contents of b should be "this is file b1" |
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137 $ cat b |
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138 This is file b1 |
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139 |
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140 $ echo This is file b22 > b |
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141 merge fails |
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142 $ hg merge 2 |
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143 abort: uncommitted changes |
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144 (use 'hg status' to list changes) |
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145 [255] |
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146 merge expected! |
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147 $ hg merge -f 2 |
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148 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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149 (branch merge, don't forget to commit) |
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150 $ hg diff --nodates |
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151 diff -r 85de557015a8 b |
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152 --- a/b |
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153 +++ b/b |
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154 @@ -1,1 +1,1 @@ |
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155 -This is file b1 |
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156 +This is file b22 |
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157 $ hg status |
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158 M b |
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159 $ cd ..; rm -r t |
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160 |
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161 $ hg init t |
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162 $ cd t |
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163 $ echo This is file a1 > a |
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164 $ hg add a |
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165 $ hg commit -m "commit #0" |
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166 $ echo This is file b1 > b |
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167 $ hg add b |
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168 $ hg commit -m "commit #1" |
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169 $ echo This is file b22 > b |
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170 $ hg commit -m "commit #2" |
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171 $ hg update 1 |
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172 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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173 $ echo This is file c1 > c |
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174 $ hg add c |
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175 $ hg commit -m "commit #3" |
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176 created new head |
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177 $ echo This is file b33 > b |
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178 merge of b should fail |
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179 $ hg merge 2 |
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180 abort: uncommitted changes |
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181 (use 'hg status' to list changes) |
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182 [255] |
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183 merge of b expected |
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184 $ hg merge -f 2 |
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185 merging b |
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186 merging for b |
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187 0 files updated, 1 files merged, 0 files removed, 0 files unresolved |
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188 (branch merge, don't forget to commit) |
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189 $ hg diff --nodates |
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190 diff -r 85de557015a8 b |
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191 --- a/b |
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192 +++ b/b |
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193 @@ -1,1 +1,1 @@ |
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194 -This is file b1 |
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195 +This is file b33 |
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196 $ hg status |
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197 M b |
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198 |
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199 Test for issue2364 |
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200 |
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201 $ hg up -qC . |
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202 $ hg rm b |
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203 $ hg ci -md |
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204 $ hg revert -r -2 b |
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205 $ hg up -q -- -2 |
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206 |
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207 $ cd .. |