Mercurial > hg
view tests/test-incoming-outgoing.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> |
---|---|
date | Wed, 04 Dec 2013 20:38:27 -0800 |
parents | 0b05e0bfdc1c |
children | 7a9cbb315d84 |
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$ "$TESTDIR/hghave" serve || exit 80 $ hg init test $ cd test $ for i in 0 1 2 3 4 5 6 7 8; do > echo $i >> foo > hg commit -A -m $i > done adding foo $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 9 changesets, 9 total revisions $ hg serve -p $HGPORT -d --pid-file=hg.pid $ cat hg.pid >> $DAEMON_PIDS $ cd .. $ hg init new http incoming $ hg -R new incoming http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming -r 4 http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 local incoming $ hg -R new incoming test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming -r 4 test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 limit to 2 changesets $ hg -R new incoming -l 2 test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 limit to 2 changesets, test with -p --git $ hg -R new incoming -l 2 -p --git test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 diff --git a/foo b/foo new file mode 100644 --- /dev/null +++ b/foo @@ -0,0 +1,1 @@ +0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 diff --git a/foo b/foo --- a/foo +++ b/foo @@ -1,1 +1,2 @@ 0 +1 test with --bundle $ hg -R new incoming --bundle test.hg http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming --bundle test2.hg test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 test the resulting bundles $ hg init temp $ hg init temp2 $ hg -R temp unbundle test.hg adding changesets adding manifests adding file changes added 9 changesets with 9 changes to 1 files (run 'hg update' to get a working copy) $ hg -R temp2 unbundle test2.hg adding changesets adding manifests adding file changes added 9 changesets with 9 changes to 1 files (run 'hg update' to get a working copy) $ hg -R temp tip changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R temp2 tip changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ rm -r temp temp2 new test outgoing $ hg clone test test-dev updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd test-dev $ for i in 9 10 11 12 13; do > echo $i >> foo > hg commit -A -m $i > done $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 14 changesets, 14 total revisions $ cd .. $ hg -R test-dev outgoing test comparing with test searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 changeset: 12:e576b1bed305 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 12 changeset: 13:96bbff09a7cc tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 13 test outgoing with secret changesets $ hg -R test-dev phase --force --secret 9 $ hg -R test-dev outgoing test comparing with test searching for changes no changes found (ignored 5 secret changesets) [1] $ hg -R test-dev phase --draft -r 'head()' limit to 3 changesets $ hg -R test-dev outgoing -l 3 test comparing with test searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 $ hg -R test-dev outgoing http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 changeset: 12:e576b1bed305 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 12 changeset: 13:96bbff09a7cc tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 13 $ hg -R test-dev outgoing -r 11 http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 incoming from empty remote repository $ hg init r1 $ hg init r2 $ echo a > r1/foo $ hg -R r1 ci -Ama adding foo $ hg -R r1 incoming r2 --bundle x.hg comparing with r2 searching for changes no changes found [1]