feat: output the runtime log to the log file

[chlins]

This pull request introduces logging enhancements across multiple modules in the codebase, using the logrus library for structured logging. It also adds configuration options for log directory and log level in the CLI tool. Below are the most important changes grouped by theme:

Logging Enhancements

• Integrated logrus for structured logging in various modules, including attach, build, extract, fetch, inspect, and list. Added detailed log statements to track the flow of operations, such as file attachments, model artifact building, and layer extraction. [1] [2] [3] [4] [5] [6]
• Added logging for key steps in the backend processes, such as calculating digests, extracting layers, and fetching blobs. This helps in debugging and understanding the execution flow. [1] [2] [3]

CLI Improvements

• Introduced new CLI flags --log-dir and --log-level to configure the logging behavior of the CLI tool. These options allow users to specify the directory for log files and the desired log verbosity.
• Ensured that the log directory exists and the log file is properly initialized before setting up logging. Added a PersistentPostRunE hook to close the log file after command execution.

Codebase Updates

• Updated cmd/root.go to include logrus setup, including setting the log level, output file, and formatter. This centralizes logging configuration for the CLI.
• Imported logrus in all relevant files to enable logging in backend operations. [1] [2] [3] [4] [5] [6]

[gemini-code-assist]

Summary of Changes

Hello @chlins, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive logging capabilities to the modctl tool, enhancing its debuggability and providing better insights into its operation. It leverages the logrus library for structured logging and offers CLI configuration options for log directory and level.

Highlights

• Logging Integration: Integrated logrus for structured logging across multiple modules including attach, build, extract, fetch, inspect, and list.
• CLI Configuration: Introduced new CLI flags --log-dir and --log-level to configure the logging behavior of the CLI tool.
• Centralized Logging Setup: Updated cmd/root.go to include logrus setup, centralizing logging configuration for the CLI, including setting the log level, output file, and formatter.

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[gemini-code-assist]

Code Review

This pull request introduces logging enhancements across multiple modules using logrus. The CLI flags for log configuration and the centralized setup in cmd/root.go are well-implemented. The review focuses on improving the quality and security of the log messages, suggesting to avoid logging entire objects to prevent verbosity and potential exposure of sensitive information.

[gaius-qi]

LGTM