Characterize Path Resolution Before You Move One open()

It sounds like you're working on a project that involves refactoring code to make it more testable and maintainable by recording file paths and operations in a ledger. This approach helps ensure that the behavior of your application remains consistent across different environments, such as when running tests or changing directories.

Here's a summary of the steps and best practices you've outlined:

1. Record One Real Invocation: Start by capturing an actual invocation of the function with its current working directory (cwd), environment variables (env), and arguments (argv). This step is crucial for establishing a baseline.

2. Trace File Operations: Trace every open, write_text, mkdir, and Path constructor call that might be moved or modified during refactoring.

3. Resolve Paths Against CWD: Resolve each raw path against the recorded cwd to store absolute paths only, ensuring consistency across different environments.

4. Hash and Commit Ledger: Hash the sorted ledger (which contains all file operations) and commit both the hash and JSON representation of the ledger.

5. Add Extra Invocations for Testing:

   • New CWD: Change the working directory.
   • Unset DATA_DIR: Remove or change the value of an environment

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