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Description of problem:
"pcs resource create" produces invalid cib when group id is already occupied with non-resource element.

How reproducible: always


Steps to Reproduce:
1.
> chose some non-resource element id.
[vm-rhel72-1 ~] $ pcs cluster cib | grep "id=\"cib-bootstrap-options-cluster-name\""
        <nvpair id="cib-bootstrap-options-cluster-name" name="cluster-name" value="devcluster"/>
2.
> try use it as group with "pcs resource create"
[vm-rhel72-1 ~] $ pcs resource create dummy Dummy --group cib-bootstrap-options-cluster-name

Actual results:
Error: Unable to update cib
Call cib_replace failed (-203): Update does not conform to the configured schema
<cib...

Expected results:
Error: 'cib-bootstrap-options-cluster-name' cannot be used as group name (is already used as name for another element)

Additional info:
The same problem is with "pcs resource group add" command, for example:

[vm-rhel72-1 ~] $ pcs resource | grep D1
 D1     (ocf::heartbeat:Dummy): Started vm-rhel72-3
[vm-rhel72-1 ~] $ pcs resource group add cib-bootstrap-options-cluster-name D1
Error: Unable to update cib
Call cib_replace failed (-203): Update does not conform to the configured schema
<cib...

Created attachment 1246654 [details]
proposed fix

Tests are in the patch.

After Fix:

[vm-rhel72-1 ~] $ rpm -q pcs
pcs-0.9.156-1.el7.x86_64

[vm-rhel72-1 ~] $ pcs cluster cib | grep 'id="cib-bootstrap-options-cluster-name"'
        <nvpair id="cib-bootstrap-options-cluster-name" name="cluster-name" value="devcluster"/>

[vm-rhel72-1 ~] $ pcs resource create dummy ocf:heartbeat:Dummy --group cib-bootstrap-options-cluster-name
Error: 'cib-bootstrap-options-cluster-name' is not a group

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1958