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Description of problem:
Hostname_prefix setting description says: The default prefix to use for the host name, must start with a letter

Since we know that prefix must start w/ letter then lets add some validation around prefix. For now I can enter any string for this setting, which may not work when host is discovered.

Like: I tried -mac(notice - ) and it was updated, though when I discovered host, given prefix was not set. So we should add validations.

Version-Release number of selected component (if applicable):
sat6.3 snap6

How reproducible:


Steps to Reproduce:
1. go to Administer -> settings -> discovered -> hostname_prefix
2. set some string which doesn't start w/ letter
3.

Actual results:
any string starting w/ special characters, number is being accepted

Expected results:
user shouldn't be able to set any random string. in case user tries to update string which doesn't start w/ letter, should get validation error.

Additional info:

Please note similar validation needs to be set in hammer:
]# hammer -u admin -p changeme settings list | grep discovery_prefix
discovery_prefix                                       |                                                                        | The default prefix to use for the host name, must start with a letter           
[root@cloud-qe]# hammer -u admin -p changeme settings set --name discovery_prefix --value "1mac"
Setting [discovery_prefix] updated to [1mac]

Thank you for your interest in Satellite 6. We have evaluated this request, and we do not expect this to be implemented in the product in the foreseeable future. We are therefore closing this out as WONTFIX. If you have any concerns about this, please feel free to contact Rich Jerrido or Bryan Kearney. Thank you.