This bug was fixed in the package libxml2 - 2.9.12+dfsg-4
---------------
libxml2 (2.9.12+dfsg-4) unstable; urgency=medium
* Team upload.
* Add a few patches from upstream:
+ Work around lxml API abuse.
+ Fix regression in xmlNodeDumpOutputInternal. LP: #1943277
+ Fix whitespace when serializing empty HTML documents.
+ Forbid epsilon-reduction of final states.
+ Fix buffering in xmlOutputBufferWrite.
-- Mattia Rizzolo <mat...@debian.org> Fri, 10 Sep 2021 22:13:09 +0200
** Changed in: libxml2 (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1943277
Title:
libxml2 2.9.12+dfsg-3 causes regression
Status in libxml2 package in Ubuntu:
Fix Released
Bug description:
root@i1:~# cat example.xml
<domain type="qemu">
<name>fake-name</name>
<os>
<type/>
</os>
<devices>
<interface type="bridge">
<mac address="22:52:25:62:e2:aa"/>
<model type="virtio"/>
<source bridge="br0"/>
<mtu size="9000"/>
<target dev="nicdc065497-3c"/>
<bandwidth>
<inbound average="100" peak="200" burst="300"/>
<outbound average="10" peak="20" burst="30"/>
</bandwidth>
</interface>
</devices>
</domain>
root@i1:~# cat xml.py
from lxml import etree
def parseXML(xmlFile):
# Parse the xml
with open(xmlFile) as fobj:
xml = fobj.read()
doc = etree.fromstring(xml)
ret = doc.findall('./devices/interface')
node_xml = etree.tostring(ret[0]).decode()
print("node_xml={}".format(node_xml))
if __name__ == "__main__":
parseXML("example.xml")
== Expected result ==
root@i1:~# python3 xml.py
node_xml=<interface type="bridge">
<mac address="22:52:25:62:e2:aa"/>
<model type="virtio"/>
<source bridge="br0"/>
<mtu size="9000"/>
<target dev="nicdc065497-3c"/>
<bandwidth>
<inbound average="100" peak="200" burst="300"/>
<outbound average="10" peak="20" burst="30"/>
</bandwidth>
</interface>
== Actual Result ==
root@i1:~# python3 xml.py
node_xml=<interface type="bridge">
<mac address="22:52:25:62:e2:aa"/>
<model type="virtio"/>
<source bridge="br0"/>
<mtu size="9000"/>
<target dev="nicdc065497-3c"/>
<bandwidth>
<inbound average="100" peak="200" burst="300"/>
<outbound average="10" peak="20" burst="30"/>
</bandwidth>
</interface>
</devices>
</domain>
This is broken in 2.9.12+dfsg-3 on impish.
It is not broken in 2.9.10+dfsg-6.3ubuntu0.1 on hirsute.
There are some fixes in master since the 2.9.12 release was cut.
https://gitlab.gnome.org/GNOME/libxml2/-/commits/master
I'm planning to pick all 3 of the following commits from upstream
master since they are all intertwined. With this patches the
regression is fixed.
85b1792e37b131e7a51af98a37f92472e8de5f3f:
Work around lxml API abuse. Make xmlNodeDumpOutput and
htmlNodeDumpFormatOutput work with corrupted parent pointers.
13ad8736d294536da4cbcd70a96b0a2fbf47070c:
Add patch from upstream to fix regression in xmlNodeDumpOutputInternal.
Commit 85b1792e could cause additional whitespace if xmlNodeDump was called
with a non-zero starting level.
92d9ab4c28842a09ca2b76d3ff2f933e01b6cd6f:
Add patch from upstream to fix whitespace when serializing empty HTML
documents.
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