thodg/libgit2/README.md

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libgit2 - the Git linkable library

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libgit2 is a portable, pure C implementation of the Git core methods provided as a re-entrant linkable library with a solid API, allowing you to write native speed custom Git applications in any language with bindings.

libgit2 is licensed under a very permissive license (GPLv2 with a special Linking Exception). This basically means that you can link it (unmodified) with any kind of software without having to release its source code. Additionally, the example code has been released to the public domain (see the separate license for more information).

Getting Help

Join us on Slack

Visit slack.libgit2.org to sign up, then join us in #libgit2. If you prefer IRC, you can also point your client to our slack channel once you’ve registered.

Getting Help

If you have questions about the library, please be sure to check out the API documentation. If you still have questions, reach out to us on Slack or post a question on StackOverflow (with the libgit2 tag).

Reporting Bugs

Please open a GitHub Issue and include as much information as possible. If possible, provide sample code that illustrates the problem you’re seeing. If you’re seeing a bug only on a specific repository, please provide a link to it if possible.

We ask that you not open a GitHub Issue for help, only for bug reports.

What It Can Do

libgit2 provides you with the ability to manage Git repositories in the programming language of your choice. It’s used in production to power many applications including GitHub.com, Plastic SCM and Visual Studio Team Services.

It does not aim to replace the git tool or its user-facing commands. Some APIs resemble the plumbing commands as those align closely with the concepts of the Git system, but most commands a user would type are out of scope for this library to implement directly.

The library provides:

As libgit2 is purely a consumer of the Git system, we have to adjust to changes made upstream. This has two major consequences:

Optional dependencies

While the library provides git functionality without the need for dependencies, it can make use of a few libraries to add to it:

Initialization

The library needs to keep track of some global state. Call

git_libgit2_init();

before calling any other libgit2 functions. You can call this function many times. A matching number of calls to

git_libgit2_shutdown();

will free the resources. Note that if you have worker threads, you should call git_libgit2_shutdown after those threads have exited. If you require assistance coordinating this, simply have the worker threads call git_libgit2_init at startup and git_libgit2_shutdown at shutdown.

Threading

See THREADING for information

Conventions

See CONVENTIONS for an overview of the external and internal API/coding conventions we use.

Building libgit2 - Using CMake

libgit2 builds cleanly on most platforms without any external dependencies. Under Unix-like systems, like Linux, *BSD and Mac OS X, libgit2 expects pthreads to be available; they should be installed by default on all systems. Under Windows, libgit2 uses the native Windows API for threading.

The libgit2 library is built using CMake (version 2.8 or newer) on all platforms.

On most systems you can build the library using the following commands

$ mkdir build && cd build
$ cmake ..
$ cmake --build .

Alternatively you can point the CMake GUI tool to the CMakeLists.txt file and generate platform specific build project or IDE workspace.

Once built, you can run the tests from the build directory with the command

$ make test

Alternatively you can run the test suite directly using,

$ ./libgit2_clar

To install the library you can specify the install prefix by setting:

$ cmake .. -DCMAKE_INSTALL_PREFIX=/install/prefix
$ cmake --build . --target install

For more advanced use or questions about CMake please read https://cmake.org/Wiki/CMake_FAQ.

The following CMake variables are declared:

Compiler and linker options

CMake lets you specify a few variables to control the behavior of the compiler and linker. These flags are rarely used but can be useful for 64-bit to 32-bit cross-compilation.

MacOS X

If you want to build a universal binary for Mac OS X, CMake sets it all up for you if you use -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" when configuring.

Windows

You need to run the CMake commands from the Visual Studio command prompt, not the regular or Windows SDK one. Select the right generator for your version with the -G "Visual Studio X" option. See [the website](http://libgit2.github.com/docs/guides/build-and-link/) for more detailed instructions. Android ------- Extract toolchain from NDK using,make-standalone-toolchain.shscript. Optionally, crosscompile and install OpenSSL inside of it. Then create CMake toolchain file that configures paths to your crosscompiler (substitute{PATH}with full path to the toolchain): SET(CMAKE_SYSTEM_NAME Linux) SET(CMAKE_SYSTEM_VERSION Android) SET(CMAKE_C_COMPILER {PATH}/bin/arm-linux-androideabi-gcc) SET(CMAKE_CXX_COMPILER {PATH}/bin/arm-linux-androideabi-g++) SET(CMAKE_FIND_ROOT_PATH {PATH}/sysroot/) SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) Add-DCMAKE_TOOLCHAIN_FILE={pathToToolchainFile}to cmake command when configuring. Language Bindings ================================== Here are the bindings to libgit2 that are currently available: * C++ * libqgit2, Qt bindings <https://projects.kde.org/projects/playground/libs/libqgit2/repository/> * Chicken Scheme * chicken-git <https://wiki.call-cc.org/egg/git> * D * dlibgit <https://github.com/s-ludwig/dlibgit> * Delphi * GitForDelphi <https://github.com/libgit2/GitForDelphi> * Erlang * Geef <https://github.com/carlosmn/geef> * Go * git2go <https://github.com/libgit2/git2go> * GObject * libgit2-glib <https://wiki.gnome.org/Projects/Libgit2-glib> * Haskell * hgit2 <https://github.com/jwiegley/gitlib> * Java * Jagged <https://github.com/ethomson/jagged> * Julia * LibGit2.jl <https://github.com/jakebolewski/LibGit2.jl> * Lua * luagit2 <https://github.com/libgit2/luagit2> * .NET * libgit2sharp <https://github.com/libgit2/libgit2sharp> * Node.js * nodegit <https://github.com/nodegit/nodegit> * Objective-C * objective-git <https://github.com/libgit2/objective-git> * OCaml * ocaml-libgit2 <https://github.com/fxfactorial/ocaml-libgit2> * Parrot Virtual Machine * parrot-libgit2 <https://github.com/letolabs/parrot-libgit2> * Perl * Git-Raw <https://github.com/jacquesg/p5-Git-Raw> * PHP * php-git <https://github.com/libgit2/php-git> * PowerShell * PSGit <https://github.com/PoshCode/PSGit> * Python * pygit2 <https://github.com/libgit2/pygit2> * R * git2r <https://github.com/ropensci/git2r> * Ruby * Rugged <https://github.com/libgit2/rugged> * Rust * git2-rs <https://github.com/alexcrichton/git2-rs> * Swift * SwiftGit2 <https://github.com/SwiftGit2/SwiftGit2> * Vala * libgit2.vapi <https://github.com/apmasell/vapis/blob/master/libgit2.vapi> If you start another language binding to libgit2, please let us know so we can add it to the list. How Can I Contribute? ================================== We welcome new contributors! We have a number of issues marked as ["up for grabs"](https://github.com/libgit2/libgit2/issues?q=is%3Aissue+is%3Aopen+label%3A%22up+for+grabs%22) and ["easy fix"](https://github.com/libgit2/libgit2/issues?utf8=✓&q=is%3Aissue+is%3Aopen+label%3A%22easy+fix%22) that are good places to jump in and get started. There's much more detailed information in our list of [outstanding projects](PROJECTS.md). Please be sure to check the [contribution guidelines](CONTRIBUTING.md) to understand our workflow, and the libgit2 [coding conventions](CONVENTIONS.md). License ==================================libgit2` is under GPL2 with linking exception. This means you can link to and use the library from any program, proprietary or open source; paid or gratis. However, if you modify libgit2 itself, you must distribute the source to your modified version of libgit2. See the COPYING file for the full license text.

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