current mercurial pacemaker stable-1.0
do
cibadmin -Q --xpath //@id
and watch your cib segfault:
WARN: Managed /usr/lib/heartbeat/cib process 15295 killed by signal 11 [SIGSEGV
- Segmentation violation]
:)
(gdb) bt
#0 0x40280a8b in xmlAddChild () from /usr/lib/libxml2.so.2
#1 0x40031828 in add_node_copy (parent=0x80b6c10, src_node=0x8101720) at
xml.c:266
#2 0x40051c64 in cib_process_xpath (op=0x806a068 "cib_query", options=2,
section=0x80ffe68 "//@id", req=0x8115bf0, input=0x0, existing_cib=0x8115d98,
result_cib=0xbfd1d198, answer=0xbfd1d19c) at cib_ops.c:938
#3 0x4004ebb4 in cib_process_query (op=0x806a068 "cib_query", options=2,
section=0x80ffe68 "//@id", req=0x8115bf0, input=0x0, existing_cib=0x8115d98,
result_cib=0xbfd1d198, answer=0xbfd1d19c) at cib_ops.c:49
#4 0x400531c1 in cib_perform_op (op=0x806a068 "cib_query", call_options=2,
fn=0x805c8d4, is_query=1, section=0x80ffe68 "//@id", req=0x8115bf0, input=0x0,
manage_counters=0, config_changed=0xbfd1d188, current_cib=0x8115d98,
result_cib=0xbfd1d198, diff=0x0, output=0xbfd1d19c)
at cib_utils.c:539
blah blah.
problem: the result is an attribute node, and gets added to the properties
field of the querry-result node on first match,
the next match will segfault out somewhere.
for only one match, I simply get an empty answer from cibadmin, no segfault.
now, why do I want to do that.
lets say I have the IP, and want to know the xml id of the IPaddr2 primitive
that handles this IP.
(yes, of course, you are right. actually I do not care about the IPaddr2, but
want to deduce the master id from a given drbd resource name.
but lets stay with the IP example for now.)
cibadmin -Q --xpath '//primiti...@type="IPaddr2" and instance_attributes/nvpair
[...@name = "ip" and @value="10.0.0.1"]]'
fine. I can sed the id out from there.
but I'd like to just do
cibadmin -Q --xpath '//primiti...@type="IPaddr2" and instance_attributes/nvpair
[...@name = "ip" and @value="10.0.0.1"]]/@id'
(which, unfortunately, is empty).
according to xmllint, my xpath query is correct, however:
cat > tmp.xml <<___
<cib>
<configuration>
<resources>
<primitive class="ocf" id="ip_try3" provider="heartbeat" type="IPaddr2">
<instance_attributes id="ip_try3-instance_attributes">
<nvpair id="ip_try3-instance_attributes-ip" name="ip"
value="10.0.0.1"/>
</instance_attributes>
</primitive>
</resources>
</configuration>
</cib>
___
xmllint --shell tmp.xml <<<'ls //@id'
/ > ls //@id
tan 7 ip_try3
t-- 27 ip_try3-instance_attributes
t-- 30 ip_try3-instance_attributes-ip
/ >
xmllint --shell tmp.xml <<<'ls //primiti...@type="IPaddr2" and
instance_attributes/nvpa...@name = "ip" and @value="10.0.0.1"]]/@id'
/ > ls //primiti...@type="IPaddr2" and instance_attributes/nvpa...@name = "ip"
and @value="10.0.0.1"]]/@id
tan 7 ip_try3
/ >
--
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com
DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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