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]

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)

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

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 883ab6b and 6001034.

Files selected for processing (1)

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.48%. Comparing base (883ab6b) to head (6001034).
Report is 14 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (883ab6b) and HEAD (6001034). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (883ab6b)	HEAD (6001034)
	15	14

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #482       +/-   ##
===========================================
- Coverage   59.92%   47.48%   -12.45%     
===========================================
  Files          39       39               
  Lines        3850     3850               
===========================================
- Hits         2307     1828      -479     
- Misses       1543     2022      +479     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[coderabbitai]

Actionable comments posted: 0

Outside diff range, codebase verification and nitpick comments (1)

dpdispatcher/machines/shell.py (1)

77-77: Enhance the error message for missing ps command.

The current error message is clear but could be improved by providing guidance on how to install ps.

Consider updating the error message as follows:

- echo >&2 "I require ps but it's not installed. Aborting."
+ echo >&2 "Error: 'ps' command is required but not installed. Please install 'procps' package. Aborting."