internal: tweak moon upgrade for new toolchain layout

[Young-Flash]

close #550

[peter-jerry-ye-code-review]

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Here are three observations and potential issues from the git diff output:

1. Potential Issue with Path Handling:

   • The code now uses download_item (which includes paths like bin/moon, lib/libtcc1.a, etc.) to construct file paths and directories. However, the code does not explicitly handle cases where download_item might contain invalid or malformed paths. For example, if download_item contains characters that are not allowed in file paths (e.g., :, *, ?, etc.), this could lead to errors when creating directories or files. It might be worth adding validation or sanitization for download_item to ensure it is a valid path.

2. Inconsistent Path Handling for dst:

   • In the post-handling section, the destination path (dst) is constructed using moon_dir::home().join(download_item). However, earlier in the code, download_item includes subdirectories like bin/, lib/, etc. This could lead to unexpected behavior if moon_dir::home() does not already contain these subdirectories. While the code does create parent directories if they don't exist, it might be better to explicitly ensure that the destination directory structure matches the source structure.

3. Potential Performance Bottleneck with Arc<Mutex<Term>>:

   • The Arc<Mutex<Term>> is used to synchronize access to the terminal for progress updates. However, locking and unlocking the Mutex for every progress update (e.g., for each chunk of data downloaded) could become a performance bottleneck, especially if there are many concurrent downloads. Consider optimizing this by batching progress updates or using a more efficient synchronization mechanism.

These are the key observations from the diff. Let me know if you'd like further clarification or suggestions for addressing these issues!