fix: Add another warning message to DNF4 plugin

[jirihnidek]

• Card ID: RHEL-112081
• When the subscription-manager DNF plugin is triggered in the container, then print warning, when shared directory /etc/pki/entitlement-host is empty and add recommendation that user should register the host

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

In the container-mode branch of the DNF subscription-manager plugin, the PR adds a check on the entitlement certificate directory to log a warning when it's empty (urging the user to register the host) and wraps the directory access in an OSError handler to log read failures.

File-Level Changes

Change	Details	Files
Added warning when entitlement certificate directory is empty	Inserted os.listdir check for HOST_ENT_CERT_DIR under container mode Logged a warning with a registration recommendation if the directory is empty	src/plugins/dnf/subscription_manager.py
Added error handling for directory access failures	Wrapped directory listing in a try/except OSError block Logged an error with directory path and exception message on failure	src/plugins/dnf/subscription_manager.py

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Instead of os.listdir, consider using os.scandir or any() to detect if the directory is empty without building a full list.
• Add an explicit os.path.isdir check and handle the case where HOST_ENT_CERT_DIR does not exist or isn’t a directory before attempting to list it.
• Use logger methods with parameterized messages (e.g. logger.error(_('Unable to read directory %(dir)s: %(err)s'), {...})) rather than formatting inside _() to ensure proper localization.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Instead of os.listdir, consider using os.scandir or any() to detect if the directory is empty without building a full list.
- Add an explicit os.path.isdir check and handle the case where HOST_ENT_CERT_DIR does not exist or isn’t a directory before attempting to list it.
- Use logger methods with parameterized messages (e.g. logger.error(_('Unable to read directory %(dir)s: %(err)s'), {...})) rather than formatting inside _() to ensure proper localization.

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[github-actions]

Coverage (computed on Fedora latest) •

File	Stmts	Miss	Cover	Missing
TOTAL	17220	4420	74%

report-only-changed-files is enabled. No files were changed during this commit :)

Tests	Skipped	Failures	Errors	Time
2388	14 💤	0 ❌	0 🔥	31.054s ⏱️