Mercurial > hg
annotate tests/test-commit-multiple.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 | 701df761aa94 |
rev | line source |
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1 # reproduce issue2264, issue2516 |
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2 |
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3 create test repo |
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4 $ cat <<EOF >> $HGRCPATH |
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5 > [extensions] |
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6 > transplant = |
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7 > EOF |
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8 $ hg init repo |
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9 $ cd repo |
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10 $ template="{rev} {desc|firstline} [{branch}]\n" |
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11 |
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12 # we need to start out with two changesets on the default branch |
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13 # in order to avoid the cute little optimization where transplant |
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14 # pulls rather than transplants |
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15 add initial changesets |
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16 $ echo feature1 > file1 |
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17 $ hg ci -Am"feature 1" |
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18 adding file1 |
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19 $ echo feature2 >> file2 |
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20 $ hg ci -Am"feature 2" |
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21 adding file2 |
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22 |
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23 # The changes to 'bugfix' are enough to show the bug: in fact, with only |
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24 # those changes, it's a very noisy crash ("RuntimeError: nothing |
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25 # committed after transplant"). But if we modify a second file in the |
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26 # transplanted changesets, the bug is much more subtle: transplant |
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27 # silently drops the second change to 'bugfix' on the floor, and we only |
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28 # see it when we run 'hg status' after transplanting. Subtle data loss |
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29 # bugs are worse than crashes, so reproduce the subtle case here. |
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30 commit bug fixes on bug fix branch |
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31 $ hg branch fixes |
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32 marked working directory as branch fixes |
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34 $ echo fix1 > bugfix |
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35 $ echo fix1 >> file1 |
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36 $ hg ci -Am"fix 1" |
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37 adding bugfix |
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38 $ echo fix2 > bugfix |
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39 $ echo fix2 >> file1 |
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40 $ hg ci -Am"fix 2" |
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41 $ hg log -G --template="$template" |
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42 @ 3 fix 2 [fixes] |
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43 | |
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44 o 2 fix 1 [fixes] |
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45 | |
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46 o 1 feature 2 [default] |
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47 | |
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48 o 0 feature 1 [default] |
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49 |
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50 transplant bug fixes onto release branch |
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51 $ hg update 0 |
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52 1 files updated, 0 files merged, 2 files removed, 0 files unresolved |
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53 $ hg branch release |
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54 marked working directory as branch release |
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56 $ hg transplant 2 3 |
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57 applying [0-9a-f]{12} (re) |
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58 [0-9a-f]{12} transplanted to [0-9a-f]{12} (re) |
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59 applying [0-9a-f]{12} (re) |
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60 [0-9a-f]{12} transplanted to [0-9a-f]{12} (re) |
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61 $ hg log -G --template="$template" |
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62 @ 5 fix 2 [release] |
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63 | |
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64 o 4 fix 1 [release] |
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65 | |
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66 | o 3 fix 2 [fixes] |
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67 | | |
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68 | o 2 fix 1 [fixes] |
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69 | | |
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70 | o 1 feature 2 [default] |
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71 |/ |
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72 o 0 feature 1 [default] |
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73 |
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74 $ hg status |
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75 $ hg status --rev 0:4 |
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76 M file1 |
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77 A bugfix |
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78 $ hg status --rev 4:5 |
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79 M bugfix |
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80 M file1 |
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81 |
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82 now test that we fixed the bug for all scripts/extensions |
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83 $ cat > $TESTTMP/committwice.py <<__EOF__ |
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84 > from mercurial import ui, hg, match, node |
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85 > from time import sleep |
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86 > |
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87 > def replacebyte(fn, b): |
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88 > f = open(fn, "rb+") |
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89 > f.seek(0, 0) |
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90 > f.write(b) |
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91 > f.close() |
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92 > |
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93 > def printfiles(repo, rev): |
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94 > print "revision %s files: %s" % (rev, repo[rev].files()) |
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95 > |
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96 > repo = hg.repository(ui.ui(), '.') |
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97 > assert len(repo) == 6, \ |
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98 > "initial: len(repo): %d, expected: 6" % len(repo) |
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99 > |
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100 > replacebyte("bugfix", "u") |
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101 > sleep(2) |
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102 > try: |
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103 > print "PRE: len(repo): %d" % len(repo) |
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104 > wlock = repo.wlock() |
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105 > lock = repo.lock() |
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106 > replacebyte("file1", "x") |
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107 > repo.commit(text="x", user="test", date=(0, 0)) |
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108 > replacebyte("file1", "y") |
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109 > repo.commit(text="y", user="test", date=(0, 0)) |
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110 > print "POST: len(repo): %d" % len(repo) |
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111 > finally: |
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112 > lock.release() |
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113 > wlock.release() |
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114 > printfiles(repo, 6) |
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115 > printfiles(repo, 7) |
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116 > __EOF__ |
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117 $ $PYTHON $TESTTMP/committwice.py |
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118 PRE: len(repo): 6 |
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119 POST: len(repo): 8 |
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120 revision 6 files: ['bugfix', 'file1'] |
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121 revision 7 files: ['file1'] |
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122 |
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123 Do a size-preserving modification outside of that process |
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124 $ echo abcd > bugfix |
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125 $ hg status |
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126 M bugfix |
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127 $ hg log --template "{rev} {desc} {files}\n" -r5: |
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128 5 fix 2 bugfix file1 |
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129 6 x bugfix file1 |
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130 7 y file1 |
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131 |
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132 $ cd .. |