backend setup is not idempotent.

[kristvanbesien]

The backend setup process is not idempotent.

How to reproduce:

• Create a playbook with the gluster.infra role. (and setup the needed variables)
• Run the playbook. Playbook succeeeds.
• Run the playbook a second time.

Expected result:

• Playbook succeeds second time along

Actual result:

• Playbook fails during the xfs filesystem creation.

Running the playbook with --skip-tages=fscreate is possible as a workaround, but is not optimal.

[sac]

The backend setup process is not idempotent.

Thanks for reporting this. I was able to debug this issue.
The `force' by default in: https://github.com/gluster/gluster-ansible-infra/blob/master/roles/backend_setup/tasks/fscreate.yml#L25 was causing the issue.

It was forcing the module to re-run the mkfs.xfs whether filesystem was already present or not.

PR: https://github.com/gluster/gluster-ansible-infra/pull/52/files fixes the issue.

[sac]

@kristvanbesien request to review #52 if you have some time.

[sac]

PR: #52 resolves this issue.