Respect capitialization of network interfaces

[agners]

Proposed change

Don't assume network interface names are always lower case. It seems
that they can have an upper case letter, and capitalization matters.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Interface enx0 does not exist #3645
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints of add-on configuration are added/changed:

• Documentation added/updated for developers.home-assistant.io

[mdegat01]

Yea was just looking at this issue. Just searched and it does look like this is the only place we do this which is good.

Technically this is a breaking change. It won't affect the UI since that doesn't let the user enter the interface name manually. But the CLI and API do. I don't think we really have a choice though and should be minor.

[agners]

Technically this is a breaking change. It won't affect the UI since that doesn't let the user enter the interface name manually. But the CLI and API do. I don't think we really have a choice though and should be minor.

Yeah well, the Ethernet interface names under Linux are case sensitive, and the CLI handles it now correctly 🤷‍♂️ . A feature and bug is sometimes a fine line 😅