Description

The current Python script (build_and_copy.py) responsible for building the Pixi executable and copying it to a destination directory has a few issues that may cause failures or unexpected behavior.

Steps to Reproduce

1. Run the script without setting the CARGO_TARGET_DIR environment variable.
2. Ensure the build process fails or the executable is missing.
3. Execute the script to copy the nonexistent executable.
4. Observe the error output.

Expected Behavior

• The script should gracefully handle missing CARGO_TARGET_DIR.
• If the executable is missing, the script should provide a meaningful error message instead of failing unexpectedly.
• Proper logging should be used instead of print statements for better debugging.

Observed Behavior

• The script raises a KeyError if CARGO_TARGET_DIR is not set.
• If the executable is missing, it proceeds to copy, leading to an unhandled FileNotFoundError.
• No clear logging is in place to debug failures effectively.

Suggested Fixes

1. Handle Missing CARGO_TARGET_DIR Gracefully

• Before using CARGO_TARGET_DIR, check if it exists.
• If not set, provide a user-friendly error message.

2. Verify the Executable Exists Before Copying

• Check if the built executable exists at the expected location.
• If missing, exit with a proper error message instead of proceeding.

3. Use Logging Instead of print Statements

• Replace all print statements with Python’s logging module for better debugging.
• Include appropriate logging levels (INFO, ERROR, etc.).