feat(wire-log): plumb through wire log

[geertj]

Description

This adds a new flag, -wire-log=<path>, that enables the wire log that was recently added to jacobsa/fuse. When enabled, this will serialize every FUSE operation as a JSON object and append it to the specified file.

The wire log is useful when analyzing workload patterns.

Testing details

The wirelog feature has unit tests in jacobsa/fuse. This merely plumbs through the flag. I have run this manually adding -wire-log wirelog.json and verified that the wire log is correctly generated.

Any backward incompatible change? If so, please explain.

None

[gemini-code-assist]

Summary of Changes

Hello @geertj, 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 integrates a new wire logging capability into the system. By introducing a command-line flag, users can now enable and specify a path for a wire log, which will record FUSE operations as JSON objects. This enhancement is designed to provide deeper insights into workload patterns, facilitating analysis and debugging of file system interactions.

Highlights

• New Wire Log Flag: Introduced a new command-line flag, -wire-log=<path>, to enable and specify the output file for the FUSE wire log.
• FUSE Operation Serialization: When enabled, the wire log will serialize each FUSE operation as a JSON object and append it to the specified file.
• Workload Analysis: This feature is intended to be useful for analyzing workload patterns by providing detailed logs of FUSE operations.

Changelog

• cfg/config.go
  • Added a WireLog field of type ResolvedPath to the LoggingConfig struct.
  • Registered the new wire-log command-line flag with a descriptive usage message.
  • Bound the wire-log flag to the logging.wire-log configuration path using Viper.
• cfg/params.yaml
  • Defined a new parameter entry for logging.wire-log, specifying its flag name, type, and detailed usage description.
• cmd/mount.go
  • Implemented conditional logic to check if a WireLog path is provided in the configuration.
  • Attempted to create the specified wire log file and assigned it to mountCfg.WireLogger upon successful creation.
  • Added error logging if the wire log file cannot be created.

Activity

• No human activity (comments, reviews, progress updates) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request introduces a new -wire-log flag to enable FUSE wire logging, which is a useful feature for debugging and analyzing workload patterns. The changes to the configuration and flag parsing are correct. However, there's an issue in cmd/mount.go where the implementation for creating the log file contradicts the 'append' behavior described in the documentation. I've left a specific comment with a suggestion to fix this.

[raj-prince]

LGTM, one comment about visibility of this flag.

[abhishek10004]

Changes look good. IMO, the flag should be hidden.

[geertj]

@abhishek10004 I made the flag hidden, please take a look

[abhishek10004]

LGTM. Let's add UT for validating this flag as well (we can use a separate PR for that).