Add support for mpi.conf templating

[bertiethorpe]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @bertiethorpe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the configuration management capabilities for OpenHPC environments by introducing support for templated generation of the mpi.conf file. This change provides greater flexibility in deploying and managing MPI configurations, ensuring that the mpi.conf is correctly set up based on environment-specific variables, and automatically triggers a SLURM controller restart when changes occur. The primary goal is to streamline the deployment and update process for MPI configurations.

Highlights

• MPI Configuration Templating: A new Ansible task has been introduced to enable templating of the mpi.conf file. This allows for dynamic generation of MPI configuration based on specified variables, improving flexibility and consistency across deployments.
• Conditional Execution: The mpi.conf templating task is configured to execute only when the control plane is enabled (openhpc_enable.control) and when MPI configuration data (openhpc_mpi_conf) is provided, ensuring the task runs only when necessary.
• Service Restart Notification: Changes to the mpi.conf file via templating will now trigger a restart of the slurmctld service, ensuring that the new MPI configuration is immediately applied and active within the SLURM environment.

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[gemini-code-assist]

Code Review

This pull request adds support for templating mpi.conf for Slurm. The implementation is straightforward, but there are a couple of areas for improvement. I've pointed out a potential runtime error in a conditional check and a variable naming collision that could be confusing. I've also noted an inconsistency with how configuration changes are handled compared to other similar tasks in the role. Addressing these points will make the new feature more robust and maintainable.

[sjpb]

Not a full review, just spotted this.

[sjpb]

LGTM