Remove Python 2 compatibility code

[vojtechtrefny]

Remove all remaining Python 2 compatibility imports and shebangs:

• Remove future imports (print_function, absolute_import, division)
• Update shebang in libmount_deb.py from python to python3
• Remove obsolete Python 2/3 compatibility comments

These are no longer needed as blivet is Python 3 only.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Removed Python 2 compatibility imports and code across the project to streamline the codebase for Python 3-only environments.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

This pull request removes Python 2 compatibility code across multiple files. Changes include removal of future imports (absolute_import, print_function, division) and updates to the Python 3 shebang, reflecting a migration away from Python 2 support.

Changes

Cohort / File(s)	Change Summary
Python 2 compatibility removal blivet/arch.py, misc/files/libmount_deb.py, tests/run_tests.py, tests/unit_tests/size_test.py	Removed Python 2 future imports (absolute_import, print_function, division) and associated compatibility comments. Updated interpreter shebang in misc/files/libmount_deb.py from /usr/bin/python to /usr/bin/python3. No functional logic changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Changes are repetitive and follow a consistent pattern across all files
• Removals are straightforward (dead code elimination)
• No logic, control flow, or behavioral changes introduced
• Low risk of introducing bugs

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Remove Python 2 compatibility code' directly and accurately summarizes the main objective of the changeset, which removes future imports, updates shebangs, and removes compatibility comments across multiple files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9d941f5 and 8954418.

📒 Files selected for processing (4)

• blivet/arch.py (0 hunks)
• misc/files/libmount_deb.py (1 hunks)
• tests/run_tests.py (0 hunks)
• tests/unit_tests/size_test.py (0 hunks)

💤 Files with no reviewable changes (3)

• tests/run_tests.py
• tests/unit_tests/size_test.py
• blivet/arch.py

🧰 Additional context used

🪛 Ruff (0.14.7)

misc/files/libmount_deb.py

1-1: Shebang is present but file is not executable

(EXE001)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: static-analysis
• GitHub Check: unit-tests

🔇 Additional comments (1)

misc/files/libmount_deb.py (1)

1-120: Python 3 migration looks good.

The removal of Python 2 compatibility code is appropriate and complete. The script correctly uses Python 3 features throughout (native print() function with keyword arguments, proper bytes/string handling with .decode()).

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Make the file executable.

The shebang update to Python 3 is correct. However, files with shebangs should typically be executable.

Apply this command to fix the file permissions:

chmod +x misc/files/libmount_deb.py

🧰 Tools

🪛 Ruff (0.14.7)

1-1: Shebang is present but file is not executable

(EXE001)

🤖 Prompt for AI Agents

In misc/files/libmount_deb.py around line 1, the file has a Python3 shebang but
is not executable; fix it by setting the executable permission on the file (make
it runnable by the owner, e.g., run chmod +x on misc/files/libmount_deb.py) so
the shebang is respected when executed.