Bug 623856 - libxml2 uses PyCObject API (deprecated in Python 2.7)
Summary: libxml2 uses PyCObject API (deprecated in Python 2.7)
Alias: None
Product: Fedora
Classification: Fedora
Component: libxml2   
(Show other bugs)
Version: 14
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Daniel Veillard
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: PyCObject
TreeView+ depends on / blocked
Reported: 2010-08-13 01:01 UTC by Dave Malcolm
Modified: 2012-08-16 21:18 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2012-08-16 21:18:47 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Dave Malcolm 2010-08-13 01:01:39 UTC
Description of problem:
Python 2.7 deprecated the PyCObject API in favor of a new "capsule" API.

The deprecations are set to "ignore" by default, so in theory the API still works.

However the deprecation has caused at least one app to fail (virt-manager, see bug 620216, due to it modifying the warning settings), so I've been doublechecking the scope of usage of the PyCObject API, and am filing bugs against components that are possibly affected.

You can trigger a hard failure of the API via:
>>> import warnings
>>> warnings.filterwarnings('error')
and then try to use your module.

Grepping through the prepped sources shows the following usage of the API:
./libxml2-2.7.7/python/types.c:166:        PyCObject_FromVoidPtrAndDesc((void *) doc, (char *) "xmlDocPtr",
./libxml2-2.7.7/python/types.c:184:        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "xmlNodePtr",
 ./libxml2-2.7.7/python/types.c:202:        PyCObject_FromVoidPtrAndDesc((void *) uri, (char *) "xmlURIPtr",
./libxml2-2.7.7/python/types.c:220:        PyCObject_FromVoidPtrAndDesc((void *) ns, (char *) "xmlNsPtr",
./libxml2-2.7.7/python/types.c:238:        PyCObject_FromVoidPtrAndDesc((void *) attr, (char *) "xmlAttrPtr",
./libxml2-2.7.7/python/types.c:256:        PyCObject_FromVoidPtrAndDesc((void *) attr,
./libxml2-2.7.7/python/types.c:274:        PyCObject_FromVoidPtrAndDesc((void *) elem,
./libxml2-2.7.7/python/types.c:292:        PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:309:    ret = PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:329:        PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:404:			    PyCObject_FromVoidPtrAndDesc((void *) node,
./libxml2-2.7.7/python/types.c:588:            if (PyCObject_Check(node)) {
./libxml2-2.7.7/python/types.c:643:		PyCObject_FromVoidPtrAndDesc((void *) valid,
./libxml2-2.7.7/python/types.c:662:        PyCObject_FromVoidPtrAndDesc((void *) catal,
./libxml2-2.7.7/python/types.c:680:        PyCObject_FromVoidPtrAndDesc((void *) buffer,
./libxml2-2.7.7/python/types.c:698:        PyCObject_FromVoidPtrAndDesc((void *) buffer,
./libxml2-2.7.7/python/types.c:717:        PyCObject_FromVoidPtrAndDesc((void *) regexp,
./libxml2-2.7.7/python/types.c:737:        PyCObject_FromVoidPtrAndDesc((void *) reader,
./libxml2-2.7.7/python/types.c:755:        PyCObject_FromVoidPtrAndDesc((void *) locator,
./libxml2-2.7.7/python/types.c:775:        PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:793:        PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:810:        PyCObject_FromVoidPtrAndDesc((void *) valid,
./libxml2-2.7.7/python/types.c:828:		PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:846:		PyCObject_FromVoidPtrAndDesc((void *) ctxt,
./libxml2-2.7.7/python/types.c:866:		PyCObject_FromVoidPtrAndDesc((void *) valid,
./libxml2-2.7.7/python/types.c:886:        PyCObject_FromVoidPtrAndDesc((void *) error,
./libxml2-2.7.7/python/libxml.c:2036:    if (!PyCObject_Check(pyobj_reader)) {
./libxml2-2.7.7/python/libxml.c:3602:    str = PyCObject_GetDesc(obj);
./libxml2-2.7.7/python/generator.py:1000:                    classes.write("'PyCObject':\n")
./libxml2-2.7.7/python/generator.py:1002:                    classes.write("'%s needs a PyCObject argument'\n" % \
./libxml2-2.7.7/ChangeLog:6455:	  PyCObject.

To what extent does this leak through to users of the API?

I'm not yet sure what the best approach is to fixing this.

Version-Release number of selected component (if applicable):

Comment 1 Fedora End Of Life 2012-08-16 21:18:50 UTC
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