go-git VS git-sizer

• Easy Integration
  go-git is a pure Go implementation of Git, which makes it straightforward to integrate into Go applications without relying on external Git binaries.
• Cross-Platform
  Since go-git is written in Go, it can be compiled and run on any platform that supports Go, enhancing its cross-platform capabilities.
• Decent Performance
  For many common operations, go-git offers good performance due to its lightweight and efficient design, making it suitable for many applications.
• Active Community
  It has an actively maintained repository with a decent number of contributors and users, which helps in getting community support and finding resources.
• Rich Feature Set
  go-git supports most Git functionalities, enabling developers to perform a wide range of version control operations programmatically.

Possible disadvantages

• Incomplete Feature Set
  go-git, while rich in features, may not support some of the more advanced or obscure Git functionalities present in the native Git client.
• Memory Usage
  The library can be memory-intensive for certain operations, particularly with very large repositories, which might necessitate additional optimization.
• Learning Curve
  Understanding and utilizing go-git effectively requires a good grasp of both Go and Git internals, which can be challenging for newcomers.
• Performance Limitations
  Although it performs well for many cases, go-git might not match the speed of the native Git implementation for all operations, particularly for large repositories.
• Limited Documentation
  Some users might find the available documentation insufficient for certain advanced use cases, necessitating further exploration or community help.

• Comprehensive Repository Analysis
  git-sizer analyzes many different dimensions of a Git repository including commit count, tree size, blob size, history depth, and reference counts, providing a holistic view of repository health and potential scaling issues.
• Easy to Use
  The tool is simple to run with minimal setup—just execute it within a git repository—and it produces clear, human-readable output that highlights potential problem areas without requiring complex configuration.
• Identifies Performance Bottlenecks
  It helps identify specific issues that could degrade Git performance, such as excessively large blobs, deep history, large trees, or too many references, which is valuable before migrating or scaling repositories.
• Open Source and Maintained by GitHub
  Being an official GitHub project, it benefits from credibility, community trust, and ongoing maintenance, and it is well documented with clear explanations of what each metric means.
• Useful for Pre-Migration Checks
  It's particularly helpful for teams migrating repositories to new platforms or consolidating repos, as it flags potential issues that could cause problems during migration or with hosting providers' limits.

Possible disadvantages

• No Automatic Remediation
  git-sizer only identifies and reports issues but does not offer any built-in tools or automated processes to fix problems like large blobs or excessive history depth—users must use separate tools like BFG Repo-Cleaner or git-filter-repo.
• Output Can Be Overwhelming for Beginners
  While detailed, the output includes many metrics and threshold levels that may be confusing for users unfamiliar with Git internals, requiring some learning curve to fully interpret results.
• Limited to Local Analysis
  The tool analyzes a local clone of the repository, so it requires users to have a full local copy of the repo (or at least enough history) to get accurate results, which can be time-consuming for very large repositories.
• No Real-Time Monitoring
  It functions as a one-time analysis tool rather than providing continuous or real-time monitoring of repository health, requiring manual reruns to track changes over time.
• Command-Line Only Interface
  The tool lacks a graphical user interface, which may be less accessible for users who prefer visual dashboards or are less comfortable with command-line tools.

No analysis of go-git yet.

Tracking go-git since Mar 2021.

• how to keep github repos small?

  Also there’s a cool project from GitHub you can use to help understand the size of git’s objects in your git repo https://github.com/github/git-sizer. This might help you determine what the best cloning strategy could be. Source: about 5 years ago