Bug 1737283

[RFE] Request.

1. Proposed title of this feature request
=>systemd unit condition DomainName

3. What are the nature and description of the request?
=> A sysadmin wants to setup a job on all hosts in the 'dhcp' subdomain (dhcp.example.com) or run a service on all hosts not in the 'dhcp' subdomain.  The systems are cloud VMs and get their hostname dynamically.

4. Why does the customer need this? (List the business requirements here)
=>Systemd has unit file conditions for node name (gethostname/uname -n).  However, the DNS Domain Name may not be set within the host's node name.  It would be helpful if there was a way to query against the DNS Domain Name.

5. How would the customer like to achieve this? (List the functional requirements here)
=>Add a systemd.unit condition "ConditionDNSDomainName" (just a name suggestion) that performs the same set of calls as `dnsdomainname` from the 'hostname` rpm to return the value.  Use of this condition should force a dependency on 'nss-lookup.target' to ensure the name service is rationally setup.

6. For each functional requirement listed, specify how Red Hat and the customer can test to confirm the requirement is successfully implemented.
=> Customer dont have test machine.

7. Is there already an existing RFE upstream or in Red Hat Bugzilla?
=> Not found any.

8. Does the customer have any specific timeline dependencies and which release would they like to target (i.e. RHEL5, RHEL6)?
=> RHEL 8.2

9. Would the customer be able to assist in testing this functionality if implemented?
=> Customer dont have test server.