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Description of problem:
'pcs constraint location <rsc> prefers|avoids' should not create any constraint unless the whole command is valid


Version-Release number of selected component (if applicable):
pcs-0.9.162-1.el7


How reproducible:
always, easily


Steps to Reproduce:
[root@rh74-node1:~]# pcs constraint
Location Constraints:
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:

[root@rh74-node1:~]# pcs constraint location dummy avoids node1 resource-discovery=never
Error: invalid score 'never', use integer or INFINITY or -INFINITY

[root@rh74-node1:~]# echo $?
1

[root@rh74-node1:~]# pcs constraint
Location Constraints:
  Resource: dummy
    Disabled on: node1 (score:-INFINITY)
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:


Actual results:
A constraint is created. An error is reported and pcs returns 1.


Expected results:
No constraint is created. An error is reported and pcs returns 1.

This has been fixed in RHEL 8: bz1673835.
Considering the current RHEL 7 life cycle stage, there will be no fix for RHEL 7.