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Created attachment 1248470 [details]
proposed fix

After Fix:

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

[vm-rhel72-1 ~] $ pcs cluster cib > cibfile.xml
[vm-rhel72-1 ~] $ pcs -f cibfile.xml resource create dummy ocf:heartbeat:Dummy
[vm-rhel72-1 ~] $ pcs cluster cib-push cibfile.xml scope=configuration
CIB updated

> Better error message when the diff of the old and the new CIB is empty

[vm-rhel72-1 ~] $ pcs cluster cib > original.xml
[vm-rhel72-1 ~] $ cp original.xml updated.xml
[vm-rhel72-1 ~] $ pcs cluster cib-push updated.xml diff-against=original.xml
Error: The new CIB is the same as the original CIB, nothing to push.

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