fix: give detailed error message when ps is not installed

[njzjz]

Summary by CodeRabbit

• New Features
  • Added a command-line check to ensure the availability of the ps command before executing the main logic of the status check, enhancing system stability and preventing runtime errors.
• Bug Fixes
  • Improved error handling by outputting a descriptive message when the ps command is not found, allowing users to understand the issue clearly.

[coderabbitai[bot]]

Walkthrough

## Walkthrough The changes introduce a validation step in the `check_status` method of `shell.py`, ensuring that the `ps` command is available before executing its main logic. This enhancement improves the reliability of the method by preventing execution if the required command is missing, thereby avoiding potential runtime errors. ## Changes | Files | Change Summary | |--------------------------------------------|---------------------------------------------------------------------------------------------------| | dpdispatcher/machines/shell.py | Added a check for the availability of the `ps` command in `check_status` method to enhance robustness. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant User participant Shell User->>Shell: Call check_status() Shell->>Shell: Check for 'ps' command alt 'ps' command is available Shell->>Shell: Execute main logic else 'ps' command not available Shell->>User: Output error message Shell->>User: Abort operation end ```

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Recent review details

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Commits

Files that changed from the base of the PR and between 883ab6bd2abfd25065ebcc26ade2c0ba8783d879 and 60010347b8d66498b829513a43821e9010476271.

Files selected for processing (1)

* dpdispatcher/machines/shell.py (1 hunks)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 47.48%. Comparing base (883ab6b) to head (6001034). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #482 +/- ## ======================================= Coverage 47.48% 47.48% ======================================= Files 39 39 Lines 3850 3850 ======================================= Hits 1828 1828 Misses 2022 2022 ```

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