Extend the functionality of apply-exit to refresh CDI config

[ArangoGutierrez]

This patch adds extra functionality to the apply-exit hook, calling the nvidia-ctk cdi generate to refresh the CDI config on a MIG (re)configuration event

[elezar]

This is no longer required.

[ArangoGutierrez]

done

[ArangoGutierrez]

PR Edited
@elezar / @klueska PTAL

[elezar]

@ArangoGutierrez how are we specifying WHERE the output should be created? Although @klueska had concerns about triggering the nvidia-cdi-refresh.service doing so would mean that we would ensure consistency in terms of the ouptut path.

Also, on:

Given that NVIDIA/nvidia-container-toolkit#1107 is merged, if I remove the --output from this PR that should be enough to allow the user to specify custom configuration via the config file

I don't think that specifying an output path in the config file makes sense since this would complicate the default behvaiour which is to output the spec to STDOUT.

[ArangoGutierrez]

@ArangoGutierrez how are we specifying WHERE the output should be created? Although @klueska had concerns about triggering the nvidia-cdi-refresh.service doing so would mean that we would ensure consistency in terms of the ouptut path.

I would like to call the nvidia-cdi-refresh.service from the hook, maybe something to discuss with @klueska

[ArangoGutierrez]

@klueska / @elezar Updated based on today's discussion

[Copilot]

Pull Request Overview

This PR extends the apply-exit hook functionality to refresh CDI (Container Device Interface) configuration after MIG reconfiguration events. The implementation adds a new hook that triggers CDI configuration updates through a systemd service.

Key changes:

• Adds a new cdi-refresh hook to the hooks configuration
• Creates a new script that conditionally starts the nvidia-cdi-refresh systemd service
• Integrates CDI refresh functionality into the MIG manager's hook system

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
deployments/systemd/hooks-default.yaml	Adds new cdi-refresh hook configuration that executes the CDI refresh script
deployments/systemd/cdi-refresh.sh	New shell script that conditionally starts nvidia-cdi-refresh.service if available

[ArangoGutierrez]

Refresher PING @klueska / @elezar

[ArangoGutierrez]

Now that we have Toolkit RC6 and are almost ready for proper release, and Systemd is stable, can we give this PR another try?
@klueska / @elezar