Check all environment variables for Slurm environment

[Flamefire]

In some environments only the SLURM_JOB_ID might be set, e.g. when using hooks for SSH to a node with an existing allocation

This causes a false positive in the detection and later KeyError on e.g. SLURM_LOCALID

[gemini-code-assist]

Summary of Changes

Hello @Flamefire, 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 refines the detection mechanism for Slurm environments to prevent erroneous identification when only a subset of Slurm-specific environment variables are present. By requiring the presence of all essential Slurm variables, the system avoids runtime errors that occur when attempting to access non-existent environment data, ensuring more robust and accurate cluster environment handling.

Highlights

• Improved Slurm Environment Detection: The logic for detecting a Slurm environment has been enhanced to check for the presence of multiple critical Slurm-related environment variables, rather than relying solely on SLURM_JOB_ID.
• Prevented KeyError: This change resolves an issue where a false positive in Slurm environment detection could lead to a KeyError when attempting to access other expected but unset Slurm environment variables like SLURM_LOCALID.

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[gemini-code-assist]

Code Review

The pull request modifies the is_env_present method in SlurmCluster to check for the presence of multiple environment variables instead of just SLURM_JOB_ID. This change aims to prevent false positives and subsequent KeyError exceptions when only SLURM_JOB_ID is set. I have added a review comment to address a potential issue.

[gemini-code-assist]

Checking for the existence of all these environment variables might be too strict. Consider whether the application can gracefully handle the absence of some of these variables, or provide a mechanism to configure which variables are required. If some variables are optional, the all() check should be adjusted accordingly to avoid preventing the cluster from being detected when it could still function.

For example, if _NODE_LIST is sometimes optional, you might want to remove it from the all() check, or have a separate check for it.

Suggested change

	return all(var in os.environ for var in
	(_JOBID_PARAM, _NODE_LIST, _PROCESS_COUNT, _PROCESS_ID, _LOCAL_PROCESS_ID))
	return _JOBID_PARAM in os.environ and all(
	var in os.environ for var in (_NODE_LIST, _PROCESS_COUNT, _PROCESS_ID, _LOCAL_PROCESS_ID)
	)