internal: structural error handling for git commands

[lijunchen]

No description provided.

[peter-jerry-ye-code-review]

Observations and Suggestions

1. Error Handling and Propagation:

   • In crates/moonbuild/src/new.rs, the function common previously had an unchecked call to is_in_git_repo and git_init_repo. This could lead to undefined behavior if these functions failed silently. The update correctly propagates errors using the ? operator, ensuring that any issues are properly handled upstream.
   • Suggestion: Ensure that all functions that can potentially fail are checked with the ? operator or explicitly handle their errors. This improves the robustness of the code.

2. Custom Error Types:

   • The changes in crates/mooncake/src/update.rs introduce custom error types like CloneRegistryIndexError, PullLatestRegistryIndexError, UpdateError, and GetRemoteUrlError. This is a good practice as it provides more context about what went wrong, making debugging easier.
   • Suggestion: Consider adding more context to the error messages within the source field of these custom errors. For example, include the directory or URL that caused the issue.

3. Testing Error Scenarios:

   • The new test test_bad_git_command in crates/moonutil/src/git.rs is a good addition for testing error handling. It ensures that the error messages are correctly formatted and contain the necessary information.
   • Suggestion: Expand the test coverage to include more error scenarios, especially those that are expected to happen in real-world situations (e.g., network issues, permission errors).

Summary

• Error Propagation: Ensure all potential errors are checked and properly handled.
• Custom Error Types: Enhance error messages with more context where applicable.
• Testing: Increase test coverage for error scenarios to ensure robust error handling.

These suggestions aim to improve the reliability and maintainability of the code by focusing on error handling and testing.