chore: better bootstrap logging

[rickeylev]

Adds additional logging in the python bootstrap.

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the robustness and debuggability of the Python bootstrap mechanism, particularly addressing cross-platform compatibility issues. It introduces more verbose logging to provide deeper insights into the bootstrap's execution flow and improves error messages for clearer problem identification. Furthermore, it includes crucial fixes for Windows environments, ensuring correct file encoding, path handling, and permissions during the build data generation and consumption processes.

Highlights

• Enhanced Bootstrap Logging: Added more verbose logging statements within the Python bootstrap process to provide deeper insights into execution flow and variable states.
• Improved Error Messages: The AssertionError message for a missing Python binary has been made more informative, including both expected and actual binary paths.
• Windows Compatibility Fixes: Implemented several changes to improve compatibility on Windows, including robust file writing in PowerShell, correct path handling in Python, and better error reporting for build data.
• Refactored Path Construction: Updated the py_executable.bzl file to use a dedicated runfiles_root_path utility for constructing the stage2 bootstrap path.

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Changelog

• python/private/build_data_writer.ps1
  • Refactored file content collection into an array for batch writing.
  • Updated file writing to use .NET's System.IO.File::WriteAllLines with UTF8 without BOM for improved encoding and locking.
  • Added Test-Path checks before attempting to read VersionFilePath and InfoFilePath.
  • Applied read permissions for 'Everyone' to the output file using ACLs.
• python/private/py_executable.bzl
  • Replaced direct string formatting for the stage2_bootstrap path with a call to the runfiles_root_path utility function.
• python/private/python_bootstrap_template.txt
  • Added print_verbose statements for STAGE2_BOOTSTRAP, PYTHON_BINARY, PYTHON_BINARY_ACTUAL, IS_ZIPFILE, RECREATE_VENV_AT_RUNTIME, and WORKSPACE_NAME.
  • Added print_verbose statements for main_rel_path and runfiles root.
  • Modified the AssertionError message for a missing Python binary to include both PYTHON_BINARY and PYTHON_BINARY_ACTUAL.
• python/private/stage2_bootstrap_template.py
  • Added a comment clarifying the need for Windows path conversion for BUILD_DATA_FILE.
  • Implemented Windows-specific path normalization and conversion (replacing '/' with '' and using os.path.normpath) for rlocation_path.
  • Changed file opening to use encoding='utf-8-sig' to correctly handle Windows Byte Order Mark (BOM).
  • Enhanced exception handling in get_build_data to add notes about the rlocation_path, file existence, and readability for debugging.
• tests/pypi/whl_installer/wheel_installer_test.py
  • Modified the tearDown method to use shutil.rmtree(..., ignore_errors=True) to prevent errors during directory removal on Windows.

Activity

• The pull request is currently marked as 'DO NOT MERGE' and is awaiting changes from pull request chore: ignore rmtree errors in wheel_installer_test #3607.

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[gemini-code-assist]

Code Review

The pull request introduces helpful improvements to the bootstrap logging and error reporting, which will aid in debugging issues during Python binary execution. The refactoring of the Windows build data writer to use .NET APIs is a robust change. However, there is a critical regression in the stage 2 bootstrap where runfiles lookup keys are incorrectly normalized with backslashes on Windows, which will break lookups. Additionally, the error handling logic in the stage 2 bootstrap should be more defensive when the runfiles lookup fails.