# libgit2 — Cross-Platform Linkable Git Library in C

> A portable, pure C implementation of the Git core methods that can be linked into any application to provide Git functionality without shelling out to the git binary.

## Install

Save in your project root:

# libgit2 — Cross-Platform Linkable Git Library in C

## Quick Use
```bash
# Build from source
git clone https://github.com/libgit2/libgit2.git
cd libgit2 && mkdir build && cd build
cmake .. && cmake --build .
# Or install via package manager
brew install libgit2   # macOS
apt install libgit2-dev  # Debian/Ubuntu
```

## Introduction
libgit2 is a portable, pure C implementation of the Git core methods provided as a linkable library. It allows applications to interact with Git repositories programmatically without requiring the git command-line tool, and it powers Git integrations in editors, IDEs, and services worldwide.

## What libgit2 Does
- Provides a complete C API for reading and writing Git repositories
- Supports cloning, fetching, pushing, and all standard Git operations
- Offers bindings for dozens of languages including Rust, Python, Ruby, C#, and Node.js
- Handles Git objects, references, index manipulation, and merge operations
- Implements custom transport and credential callback mechanisms

## Architecture Overview
libgit2 is structured as a layered C library with a public API surface, an internal object database layer, and pluggable backends for storage and networking. It uses a thread-safe design with no global state, making it suitable for embedding in multi-threaded applications. Transport layers (HTTP, SSH, local) are modular and can be replaced or extended.

## Self-Hosting & Configuration
- Build with CMake on any platform (Linux, macOS, Windows, BSD)
- Link against your application as a shared or static library
- Configure SSL backend (OpenSSL, mbedTLS, or platform-native)
- Set up SSH support via libssh2 for remote operations
- Use language bindings like Rugged (Ruby), pygit2 (Python), or git2-rs (Rust)

## Key Features
- Zero dependency on the git binary — fully self-contained
- Thread-safe design with no global mutable state
- Extensive language binding ecosystem across 20+ languages
- Custom backend support for object storage and references
- Battle-tested in production by GitHub, GitLab, Visual Studio, and Xcode

## Comparison with Similar Tools
- **git CLI** — full-featured but requires subprocess calls and output parsing
- **JGit** — Java-only Git implementation, heavier runtime
- **go-git** — Go-native Git library, no C FFI needed but Go-specific
- **gitoxide (gix)** — newer Rust-native Git implementation, still maturing
- **dulwich** — pure Python Git implementation, slower for large repos

## FAQ
**Q: Which products use libgit2 in production?**
A: GitHub Desktop, Visual Studio, Xcode, GitKraken, Sublime Merge, and many CI/CD systems rely on libgit2.

**Q: Does libgit2 support all Git features?**
A: It covers the vast majority of Git operations. Some advanced features like interactive rebase require the git CLI.

**Q: How do I use libgit2 from my programming language?**
A: Use the official or community-maintained bindings: Rugged for Ruby, pygit2 for Python, git2-rs for Rust, LibGit2Sharp for C#/.NET, or NodeGit for Node.js.

**Q: Is libgit2 compatible with repositories created by git?**
A: Yes. libgit2 reads and writes standard Git repository formats and is fully interoperable with the git CLI.

## Sources
- https://github.com/libgit2/libgit2
- https://libgit2.org

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Source: https://tokrepo.com/en/workflows/asset-b864ad36
Author: AI Open Source