Your message dated Mon, 16 Jun 2014 22:06:24 +0000
with message-id <[email protected]>
and subject line Bug#653402: fixed in pyenchant 1.6.6-1
has caused the Debian Bug report #653402,
regarding python-enchant: find_library should not be used
to be marked as done.
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If this is not the case it is now your responsibility to reopen the
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653402: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653402
Debian Bug Tracking System
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--- Begin Message ---
package: python-enchant
severity: important
It was recently discovered that it is not possible to import
python-enchant in python2.6 on armhf unless libenchant-dev is installed.
Loic minor identified the issue as being the use of find_library
Essentially ctypes' "find_library" is very wrong and should not be used
(it tries to emulate ld.so's search behavior but does so with many
scary shortcuts...). find_library breaks on armhf because its ldconfig
output parsing isn't ready for the ",hard-float" suffix on libraries in
the cache.
Not only is find_library poorly implemented, but it also encourages
upstreams to try loading *any* SONAME from a library (in fact the first
one which comes in the ldconfig output), and with *whatever*
architecture ABI. So if you have the 32-bits libenchant12, 32-bits
libenchant13, 64-bits libenchant12 and 64-bits libenchant13, and you
find_library("enchant"), any of these libraries might be loaded
depending on the ldconfig output ordering...
It seems the armhf issue has now been papered over in python2.7 but not in
python2.6. However as I understand it the papering over may well not work
in a multiarch environment as find_library may still find a library of
the wrong
abi (either wrong soversion or wrong architecture) . Therefore packages
should
still stop using it
I asked loic what should be done instead of using find_library and he
had the
following reply
The code using find_library is in
enchant/_enchant.py, _e_path_possibilities() yields some pathnames
where the library should be loaded from:
def _e_path_possibilities():
"""Generator yielding possible locations of the enchant library."""
yield os.environ.get("PYENCHANT_LIBRARY_PATH")
yield find_library("enchant")
yield find_library("libenchant")
yield find_library("libenchant-1")
if sys.platform == 'darwin':
# enchant lib installed by macports
yield "/opt/local/lib/libenchant.dylib"
as you can see, this doesn't encode the SONAME anywhere, so that if the
ABI / SONAME change and the old and new ones are present, a random one
will be chosen. Ideally, the code would gain awareness of the
ABIs / SONAMEs that pyenchant actually works with and do something
like:
for soname in ('libenchant.so.1', 'libenchant.so.0'):
try:
e = cdll.LoadLibrary(soname)
except OSError:
pass
if e:
break
this could be used by default for all unixish systems, but I guess
upstream would still want PYENCHANT_LIBRARY_PATH to be preferred in
some way.
(The above snippet would be used somewhere near line 119 "# Not found
yet, search various standard system locations." in enchant/_enchant.py
and would try libenchant.so.1 and fall back to libenchant.so.0).
For detailed discussions please see the thread on
debian-arm/debian-python at
http://lists.debian.org/debian-arm/2011/12/msg00113.html
--- End Message ---
--- Begin Message ---
Source: pyenchant
Source-Version: 1.6.6-1
We believe that the bug you reported is fixed in the latest version of
pyenchant, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Piotr Ożarowski <[email protected]> (supplier of updated pyenchant package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Mon, 16 Jun 2014 23:25:57 +0200
Source: pyenchant
Binary: python-enchant python3-enchant
Architecture: source all
Version: 1.6.6-1
Distribution: unstable
Urgency: medium
Maintainer: Piotr Ożarowski <[email protected]>
Changed-By: Piotr Ożarowski <[email protected]>
Description:
python-enchant - spellchecking library for Python
python3-enchant - spellchecking library for Python 3
Closes: 653402
Changes:
pyenchant (1.6.6-1) unstable; urgency=medium
.
[ Jakub Wilk ]
* Use canonical URIs for Vcs-* fields.
.
[ Piotr Ożarowski ]
* New upstream release
- prioritizes enchant libraries with tested SONAME (closes: 653402)
- disable_ez_setup patch no longer needed (ez_setup is now imported only
if setuptools is missing)
* Add dh-python to Build-Depends
* Homepage updated
* Standards-Version bumped to 3.9.5 (no changes needed)
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