Safety net: Explicitly block Azure Linux 4 and RHEL 10 until LPE support is available

[yashnap]

• Detect Azure Linux 4.x and RHEL 10.x distributions and enforce a safety‑net exception until LPE dnf5 support is fully implemented and validated.

Linux4 VM ARM ID : /subscriptions/6acc8a91-e2b0-4041-a069-c2932ab42fd9/resourceGroups/rg-yashna-linux4-test-wus2/providers/Microsoft.Compute/virtualMachines/vm-yashna-linux4

LogFolder : /tmp/linux-patch/linux4_2/log

Linux 3 ARM ID : /subscriptions/6acc8a91-e2b0-4041-a069-c2932ab42fd9/resourceGroups/rg-linux3-tdnf/providers/Microsoft.Compute/virtualMachines/vm-linux3-tdnf-yashna

LogFolder: /tmp/linux-patch/linux4_2/log

Red Hat Arm ID : /subscriptions/6acc8a91-e2b0-4041-a069-c2932ab42fd9/resourceGroups/rg-rhel_10_yashna/providers/Microsoft.Compute/virtualMachines/vm-rhel-10-yashna

LogFolder : /tmp/linux-patch/linux4_1/log

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.84%. Comparing base (525a32f) to head (f8871ea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #344      +/-   ##
==========================================
+ Coverage   93.82%   93.84%   +0.02%     
==========================================
  Files         105      105              
  Lines       18172    18218      +46     
==========================================
+ Hits        17049    17096      +47     
+ Misses       1123     1122       -1     

Flag	Coverage Δ
python27	93.84% <100.00%> (+0.02%)	⬆️
python312	93.84% <100.00%> (+0.02%)	⬆️

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[Copilot]

Pull request overview

This PR adds a safety-net to prevent Linux Patch Extension from running on Azure Linux 4.x and RHEL 10.x until dnf5 support is implemented/validated, by detecting those OS versions during package manager detection and raising an explicit exception. It also adds unit tests for these new unsupported-OS behaviors.

Changes:

• Add Azure Linux 4 and RHEL 10 blocking logic to EnvLayer.get_package_manager().
• Update Azure Linux version-check docstring wording (3 or beyond).
• Add new unit tests/mocks covering Azure Linux 4 and RHEL 10 unsupported cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/core/src/bootstrap/EnvLayer.py	Adds OS version detection and hard-block exceptions for Azure Linux 4+ and RHEL 10+.
src/core/tests/Test_EnvLayer.py	Adds mocks and unit tests asserting exceptions for Azure Linux 4 and RHEL 10.

Comments suppressed due to low confidence (1)

src/core/tests/Test_EnvLayer.py:189

• This test patches platform.system but does not restore it afterward, which can affect subsequent tests in the same run. Please back up and restore platform.system (preferably using try/finally alongside the other restorations).

        platform.system = self.mock_platform_system
        self.envlayer.platform.linux_distribution = self.mock_linux_distribution
        distro.os_release_attr = self.mock_distro_os_release_attr_return_rhel_10
        distro.id = self.mock_distro_id_return_rhel

        with self.assertRaises(Exception) as context:
            self.envlayer.get_package_manager()
        self.assertEqual(str(context.exception), "RHEL 10 is not yet supported in your region. Please review aka.ms/LinuxPatchExtension for more information.")

        # restore
        distro.id = self.backup_distro_id
        distro.os_release_attr = self.backup_distro_os_release_attr
        self.envlayer.platform.linux_distribution = self.backup_linux_distribution

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[kjohn-msft]

@rane-rajasi to review deeper with context of comments left.

[rane-rajasi]

Make sure to upload latest inVM testing logs since the code has changed from its previous implementation

[yashnap]

Make sure to upload latest inVM testing logs since the code has changed from its previous implementation

@rane-rajasi The outputs attached in description is latest from yesterday after the change.

[rane-rajasi]

Only one minor comment