Mercurial > hg
annotate tests/test-histedit-fold-non-commute.t @ 20742:3681de20b0a7
parsers: fail fast if Python has wrong minor version (issue4110)
This change causes an informative ImportError to be raised when importing
the parsers extension module if the minor version of the currently-running
Python interpreter doesn't match that of the Python used when compiling
the extension module.
This change also exposes a parsers.versionerrortext constant in the
C implementation of the module. Its presence can be used to determine
whether this behavior is present in a version of the module. The value
of the constant is the leading text of the ImportError raised and is set
to "Python minor version mismatch".
Here is an example of what the new error looks like:
Traceback (most recent call last):
File "test.py", line 1, in <module>
import mercurial.parsers
ImportError: Python minor version mismatch: The Mercurial extension
modules were compiled with Python 2.7.6, but Mercurial is currently using
Python with sys.hexversion=33883888: Python 2.5.6
(r256:88840, Nov 18 2012, 05:37:10)
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))]
at: /opt/local/Library/Frameworks/Python.framework/Versions/2.5/Resources/
Python.app/Contents/MacOS/Python
The reason for raising an error in this scenario is that Python's C API
is known not to be compatible from minor version to minor version, even
if sys.api_version is the same. See for example this Python bug report
about incompatibilities between 2.5 and 2.6+:
http://bugs.python.org/issue8118
These incompatibilities can cause Mercurial to break in mysterious,
unforeseen ways. For example, when Mercurial compiled with Python 2.7 was
run with 2.5, the following crash occurred when running "hg status":
http://bz.selenic.com/show_bug.cgi?id=4110
After this crash was fixed, running with Python 2.5 no longer crashes, but
the following puzzling behavior still occurs:
$ hg status
...
File ".../mercurial/changelog.py", line 123, in __init__
revlog.revlog.__init__(self, opener, "00changelog.i")
File ".../mercurial/revlog.py", line 251, in __init__
d = self._io.parseindex(i, self._inline)
File ".../mercurial/revlog.py", line 158, in parseindex
index, cache = parsers.parse_index2(data, inline)
TypeError: data is not a string
which can be reproduced more simply with:
import mercurial.parsers as parsers
parsers.parse_index2("", True)
Both the crash and the TypeError occurred because the Python C API's
PyString_Check() returns the wrong value when the C header files from
Python 2.7 are run with Python 2.5. This is an example of an
incompatibility of the sort mentioned in the Python bug report above.
Failing fast with an informative error message results in a better user
experience in cases like the above. The information in the ImportError
also simplifies troubleshooting for those on Mercurial mailing lists, the
bug tracker, etc.
This patch only adds the version check to parsers.c, which is sufficient
to affect command-line commands like "hg status" and "hg summary".
An idea for a future improvement is to move the version-checking C code
to a more central location, and have it run when importing all
Mercurial extension modules and not just parsers.c.
author | Chris Jerdonek <chris.jerdonek@gmail.com> |
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date | Wed, 04 Dec 2013 20:38:27 -0800 |
parents | aa9385f983fa |
children | 19d6fec60b81 |
rev | line source |
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1 $ . "$TESTDIR/histedit-helpers.sh" |
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2 |
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3 $ cat >> $HGRCPATH <<EOF |
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4 > [extensions] |
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5 > histedit= |
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6 > EOF |
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7 |
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8 $ initrepo () |
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9 > { |
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10 > hg init $1 |
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11 > cd $1 |
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12 > for x in a b c d e f ; do |
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13 > echo $x$x$x$x$x > $x |
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14 > hg add $x |
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15 > done |
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16 > hg ci -m 'Initial commit' |
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17 > for x in a b c d e f ; do |
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18 > echo $x > $x |
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19 > hg ci -m $x |
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20 > done |
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21 > echo 'I can haz no commute' > e |
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22 > hg ci -m 'does not commute with e' |
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23 > cd .. |
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24 > } |
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25 |
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26 $ initrepo r |
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27 $ cd r |
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28 Initial generation of the command files |
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29 |
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30 $ EDITED="$TESTTMP/editedhistory" |
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31 $ hg log --template 'pick {node|short} {rev} {desc}\n' -r 3 >> $EDITED |
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32 $ hg log --template 'pick {node|short} {rev} {desc}\n' -r 4 >> $EDITED |
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33 $ hg log --template 'fold {node|short} {rev} {desc}\n' -r 7 >> $EDITED |
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34 $ hg log --template 'pick {node|short} {rev} {desc}\n' -r 5 >> $EDITED |
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35 $ hg log --template 'pick {node|short} {rev} {desc}\n' -r 6 >> $EDITED |
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36 $ cat $EDITED |
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37 pick 65a9a84f33fd 3 c |
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38 pick 00f1c5383965 4 d |
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39 fold 39522b764e3d 7 does not commute with e |
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40 pick 7b4e2f4b7bcd 5 e |
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41 pick 500cac37a696 6 f |
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42 |
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43 log before edit |
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44 $ hg log --graph |
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45 @ changeset: 7:39522b764e3d |
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46 | tag: tip |
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47 | user: test |
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48 | date: Thu Jan 01 00:00:00 1970 +0000 |
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49 | summary: does not commute with e |
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50 | |
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51 o changeset: 6:500cac37a696 |
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52 | user: test |
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53 | date: Thu Jan 01 00:00:00 1970 +0000 |
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54 | summary: f |
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55 | |
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56 o changeset: 5:7b4e2f4b7bcd |
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57 | user: test |
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58 | date: Thu Jan 01 00:00:00 1970 +0000 |
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59 | summary: e |
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60 | |
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61 o changeset: 4:00f1c5383965 |
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62 | user: test |
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63 | date: Thu Jan 01 00:00:00 1970 +0000 |
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64 | summary: d |
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65 | |
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66 o changeset: 3:65a9a84f33fd |
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67 | user: test |
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68 | date: Thu Jan 01 00:00:00 1970 +0000 |
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69 | summary: c |
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70 | |
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71 o changeset: 2:da6535b52e45 |
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72 | user: test |
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73 | date: Thu Jan 01 00:00:00 1970 +0000 |
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74 | summary: b |
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75 | |
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76 o changeset: 1:c1f09da44841 |
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77 | user: test |
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78 | date: Thu Jan 01 00:00:00 1970 +0000 |
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79 | summary: a |
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80 | |
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81 o changeset: 0:1715188a53c7 |
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82 user: test |
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83 date: Thu Jan 01 00:00:00 1970 +0000 |
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84 summary: Initial commit |
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85 |
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86 |
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87 edit the history |
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88 $ hg histedit 3 --commands $EDITED 2>&1 | fixbundle |
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89 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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90 merging e |
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91 warning: conflicts during merge. |
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92 merging e incomplete! (edit conflicts, then use 'hg resolve --mark') |
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93 Fix up the change and run hg histedit --continue |
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94 |
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95 fix up |
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96 $ echo 'I can haz no commute' > e |
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97 $ hg resolve --mark e |
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98 $ cat > cat.py <<EOF |
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99 > import sys |
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100 > print open(sys.argv[1]).read() |
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101 > print |
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102 > print |
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103 > EOF |
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104 $ HGEDITOR="python cat.py" hg histedit --continue 2>&1 | fixbundle | grep -v '2 files removed' |
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105 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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106 d |
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107 *** |
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108 does not commute with e |
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109 |
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110 |
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111 |
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112 HG: Enter commit message. Lines beginning with 'HG:' are removed. |
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113 HG: Leave message empty to abort commit. |
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114 HG: -- |
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115 HG: user: test |
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116 HG: branch 'default' |
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117 HG: changed d |
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118 HG: changed e |
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119 |
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120 |
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121 |
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122 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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123 0 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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124 merging e |
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125 warning: conflicts during merge. |
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126 merging e incomplete! (edit conflicts, then use 'hg resolve --mark') |
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127 Fix up the change and run hg histedit --continue |
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128 |
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129 just continue this time |
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130 $ hg revert -r 'p1()' e |
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131 $ hg resolve --mark e |
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132 $ hg histedit --continue 2>&1 | fixbundle |
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133 0 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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134 0 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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135 |
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136 log after edit |
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137 $ hg log --graph |
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138 @ changeset: 5:d9cf42e54966 |
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139 | tag: tip |
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140 | user: test |
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141 | date: Thu Jan 01 00:00:00 1970 +0000 |
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142 | summary: f |
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143 | |
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144 o changeset: 4:10486af2e984 |
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145 | user: test |
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146 | date: Thu Jan 01 00:00:00 1970 +0000 |
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147 | summary: d |
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148 | |
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149 o changeset: 3:65a9a84f33fd |
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150 | user: test |
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151 | date: Thu Jan 01 00:00:00 1970 +0000 |
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152 | summary: c |
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153 | |
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154 o changeset: 2:da6535b52e45 |
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155 | user: test |
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156 | date: Thu Jan 01 00:00:00 1970 +0000 |
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157 | summary: b |
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158 | |
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159 o changeset: 1:c1f09da44841 |
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160 | user: test |
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161 | date: Thu Jan 01 00:00:00 1970 +0000 |
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162 | summary: a |
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163 | |
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164 o changeset: 0:1715188a53c7 |
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165 user: test |
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166 date: Thu Jan 01 00:00:00 1970 +0000 |
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167 summary: Initial commit |
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168 |
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169 |
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170 contents of e |
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171 $ hg cat e |
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172 I can haz no commute |
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173 |
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174 manifest |
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175 $ hg manifest |
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176 a |
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177 b |
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178 c |
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179 d |
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180 e |
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181 f |
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182 |
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183 $ cd .. |