refactor: Improve error reporting on sudo execution error

[didier-wenzek]

Proposed changes

Improve error reporting when:

• a command has not been configured to be executable by tedge with sudo
• a sm plugin has not been properly configured to be used with sudo
• a log plugin has not been properly configured to be used with sudo

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

Codecov Report

❌ Patch coverage is 28.57143% with 50 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/common/tedge_config/src/sudo.rs	33.33%	30 Missing ⚠️
crates/core/plugin_sm/src/plugin_manager.rs	30.76%	6 Missing and 3 partials ⚠️
...extensions/tedge_log_manager/src/plugin_manager.rs	10.00%	9 Missing ⚠️
crates/core/plugin_sm/src/plugin.rs	0.00%	2 Missing ⚠️

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[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
710	0	3	710	100	2h9m26.69505s

[reubenmiller]

@didier-wenzek I've been trying to run the "Overriding a log plugin" system test locally and removing the sudoers rule to see the behaviour, but I'm not seeing any log output indicating a sudoer rule issue. I only see the following error (which is similar to what we had before):

Oct 06 12:04:17 0529f55f43d7 tedge-agent[969]: 2025-10-06T12:04:17.538831466Z ERROR log plugins: Skipping /usr/local/tedge/log-plugins/fake_plugin: does not support list operation and may not be a valid plugin

[didier-wenzek]

@didier-wenzek I've been trying to run the "Overriding a log plugin" system test locally and removing the sudoers rule to see the behaviour, but I'm not seeing any log output indicating a sudoer rule issue. I only see the following error (which is similar to what we had before):

Oct 06 12:04:17 0529f55f43d7 tedge-agent[969]: 2025-10-06T12:04:17.538831466Z ERROR log plugins: Skipping /usr/local/tedge/log-plugins/fake_plugin: does not support list operation and may not be a valid plugin

My bad. A check was inverted. Fixed + a new system test: c9a5ad7

[reubenmiller]

Approved. Nice improvement

Sorry I forgot I still had an open test change

[reubenmiller]

Approved