Install xvfb on headless (linux) machines

[smlambert]

1. install xvfb
   Much like the jck machines have xvfb installed (https://github.com/AdoptOpenJDK/openjdk-infrastructure/blob/master/ansible/playbooks/ubuntu-jck.yml#L26), we need it to be installed on all machines.

2. remove other x11 configuration
   The other x11 server setup that is currently being done in the playbooks (https://github.com/AdoptOpenJDK/openjdk-infrastructure/blob/master/ansible/playbooks/AdoptOpenJDK_Linux_Playbook/roles/x11/tasks/main.yml) is likely not needed, unless you know of someone else using them.

It is not required to start the display as the ubuntu-jck playbook does, as we can/should control that from the Jenkinsfile.

More details on this approach (suggested by @tellison): adoptium/aqa-tests#49 (comment)

[sxa]

Mac will require a different solution as I understand it. @gdams has my issue to do it for the JCK boxes (our first attempt didn't work properly) but if anyone else has experience of sensible ways of doing this they're welcome to volunteer ;-)

[sxa]

@smlambert Do the other X packages explicitly need to be removed from the existing boxes? Or are you just asking for them to be removed from the playbook as they're not required to your knowledge?

[smlambert]

I do not believe they need to be removed from the machine/playbook (as in I don't think they interfere with the xvfb solution, though I do not have a machine to confirm that on). I mentioned it only as a code hygiene suggestion, since I am not aware of anyone who needs/depends on them.

[geraintwjones]

What is the relationship between this issue and #217?

[sxa]

@geraintwjones Other than the query over whether it's necessary to remove any existing packages #217 (comment) there's no significant difference - the other one specifically references the playbook, I suppose you could consider this one "executing the playbook to resolve Shelley's issue" they're

[geraintwjones]

Someone's already added xorg-x11-server-Xvfb for RedHat and xvfb for Ubuntu.
Of the platforms we've currently defined packages for, that leaves...

• CentOS
• FreeBSD
• OracleLinux
• SLES

I can only currently test packages on CentOS and SLES, so I'll focus on those first.

[geraintwjones]

So all playbooks modified, and changes merged. Now need to run them.

[karianna]

@geraintwjones Can this be closed now?

[sxa]

I reckon so, therefore closing :-)