README.md

   1 libgit2 - the Git linkable library
   2 ==================================
   3
   4 [![Build Status](https://secure.travis-ci.org/libgit2/libgit2.png?branch=development)](http://travis-ci.org/libgit2/libgit2)
   5 [![Coverity Scan Build Status](https://scan.coverity.com/projects/639/badge.svg)](https://scan.coverity.com/projects/639)
   6
   7 `libgit2` is a portable, pure C implementation of the Git core methods
   8 provided as a re-entrant linkable library with a solid API, allowing you to
   9 write native speed custom Git applications in any language with bindings.
  10
  11 `libgit2` is licensed under a **very permissive license** (GPLv2 with a special
  12 Linking Exception).  This basically means that you can link it (unmodified)
  13 with any kind of software without having to release its source code.
  14 Additionally, the example code has been released to the public domain (see the
  15 [separate license](examples/COPYING) for more information).
  16
  17 * Website: [libgit2.github.com](http://libgit2.github.com)
  18 * StackOverflow Tag: [libgit2](http://stackoverflow.com/questions/tagged/libgit2)
  19 * Issues: [GitHub Issues](https://github.com/libgit2/libgit2/issues) (Right here!)
  20 * API documentation: <http://libgit2.github.com/libgit2>
  21 * IRC: [#libgit2](irc://irc.freenode.net/libgit2) on irc.freenode.net.
  22 * Mailing list: The libgit2 mailing list was
  23     traditionally hosted in Librelist but has been deprecated. We encourage you to
  24     [use StackOverflow](http://stackoverflow.com/questions/tagged/libgit2) instead for any questions regarding
  25     the library, or [open an issue](https://github.com/libgit2/libgit2/issues)
  26     on GitHub for bug reports.  The mailing list archives are still available at
  27     <http://librelist.com/browser/libgit2/>.
  28
  29
  30 What It Can Do
  31 ==============
  32
  33 `libgit2` is already very usable and is being used in production for many
  34 applications including the GitHub.com site, in Plastic SCM and also powering
  35 Microsoft's Visual Studio tools for Git.  The library provides:
  36
  37 * SHA conversions, formatting and shortening
  38 * abstracted ODB backend system
  39 * commit, tag, tree and blob parsing, editing, and write-back
  40 * tree traversal
  41 * revision walking
  42 * index file (staging area) manipulation
  43 * reference management (including packed references)
  44 * config file management
  45 * high level repository management
  46 * thread safety and reentrancy
  47 * descriptive and detailed error messages
  48 * ...and more (over 175 different API calls)
  49
  50 Optional dependencies
  51 =====================
  52
  53 While the library provides git functionality without the need for
  54 dependencies, it can make use of a few libraries to add to it:
  55
  56 - pthreads (non-Windows) to enable threadsafe access as well as multi-threaded pack generation
  57 - OpenSSL (non-Windows) to talk over HTTPS and provide the SHA-1 functions
  58 - LibSSH2 to enable the SSH transport
  59 - iconv (OSX) to handle the HFS+ path encoding peculiarities
  60
  61 Building libgit2 - Using CMake
  62 ==============================
  63
  64 `libgit2` builds cleanly on most platforms without any external dependencies.
  65 Under Unix-like systems, like Linux, \*BSD and Mac OS X, libgit2 expects `pthreads` to be available;
  66 they should be installed by default on all systems. Under Windows, libgit2 uses the native Windows API
  67 for threading.
  68
  69 The `libgit2` library is built using [CMake](<http://www.cmake.org>) (version 2.6 or newer) on all platforms.
  70
  71 On most systems you can build the library using the following commands
  72
  73         $ mkdir build && cd build
  74         $ cmake ..
  75         $ cmake --build .
  76
  77 Alternatively you can point the CMake GUI tool to the CMakeLists.txt file and generate platform specific build project or IDE workspace.
  78
  79 To install the library you can specify the install prefix by setting:
  80
  81         $ cmake .. -DCMAKE_INSTALL_PREFIX=/install/prefix
  82         $ cmake --build . --target install
  83
  84 For more advanced use or questions about CMake please read <http://www.cmake.org/Wiki/CMake_FAQ>.
  85
  86 The following CMake variables are declared:
  87
  88 - `BIN_INSTALL_DIR`: Where to install binaries to.
  89 - `LIB_INSTALL_DIR`: Where to install libraries to.
  90 - `INCLUDE_INSTALL_DIR`: Where to install headers to.
  91 - `BUILD_SHARED_LIBS`: Build libgit2 as a Shared Library (defaults to ON)
  92 - `BUILD_CLAR`: Build [Clar](https://github.com/vmg/clar)-based test suite (defaults to ON)
  93 - `THREADSAFE`: Build libgit2 with threading support (defaults to OFF)
  94 - `STDCALL`: Build libgit2 as `stdcall`. Turn off for `cdecl` (Windows; defaults to ON)
  95
  96 Compiler and linker options
  97 ---------------------------
  98
  99 CMake lets you specify a few variables to control the behavior of the
 100 compiler and linker. These flags are rarely used but can be useful for
 101 64-bit to 32-bit cross-compilation.
 102
 103 - `CMAKE_C_FLAGS`: Set your own compiler flags
 104 - `CMAKE_FIND_ROOT_PATH`: Override the search path for libraries
 105 - `ZLIB_LIBRARY`, `OPENSSL_SSL_LIBRARY` AND `OPENSSL_CRYPTO_LIBRARY`:
 106 Tell CMake where to find those specific libraries
 107
 108 MacOS X
 109 -------
 110
 111 If you want to build a universal binary for Mac OS X, CMake sets it
 112 all up for you if you use `-DCMAKE_OSX_ARCHITECTURES="i386;x86_64"`
 113 when configuring.
 114
 115 Windows
 116 -------
 117
 118 You need to run the CMake commands from the Visual Studio command
 119 prompt, not the regular or Windows SDK one. Select the right generator
 120 for your version with the `-G "Visual Studio X" option.
 121
 122 See [the wiki]
 123 (https://github.com/libgit2/libgit2/wiki/Building-libgit2-on-Windows)
 124 for more detailed instructions.
 125
 126 Android
 127 -------
 128
 129 Extract toolchain from NDK using, `make-standalone-toolchain.sh` script.
 130 Optionally, crosscompile and install OpenSSL inside of it. Then create CMake
 131 toolchain file that configures paths to your crosscompiler (substitute `{PATH}`
 132 with full path to the toolchain):
 133
 134         SET(CMAKE_SYSTEM_NAME Linux)
 135         SET(CMAKE_SYSTEM_VERSION Android)
 136
 137         SET(CMAKE_C_COMPILER   {PATH}/bin/arm-linux-androideabi-gcc)
 138         SET(CMAKE_CXX_COMPILER {PATH}/bin/arm-linux-androideabi-g++)
 139         SET(CMAKE_FIND_ROOT_PATH {PATH}/sysroot/)
 140
 141         SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 142         SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 143         SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 144
 145 Add `-DCMAKE_TOOLCHAIN_FILE={pathToToolchainFile} -DANDROID=1` to cmake command
 146 when configuring.
 147
 148 Language Bindings
 149 ==================================
 150
 151 Here are the bindings to libgit2 that are currently available:
 152
 153 * C++
 154     * libqgit2, Qt bindings <https://projects.kde.org/projects/playground/libs/libqgit2/>
 155 * Chicken Scheme
 156     * chicken-git <https://wiki.call-cc.org/egg/git>
 157 * D
 158     * dlibgit <https://github.com/AndrejMitrovic/dlibgit>
 159 * Delphi
 160     * GitForDelphi <https://github.com/libgit2/GitForDelphi>
 161 * Erlang
 162     * Geef <https://github.com/carlosmn/geef>
 163 * Go
 164     * git2go <https://github.com/libgit2/git2go>
 165 * GObject
 166     * libgit2-glib <https://live.gnome.org/Libgit2-glib>
 167 * Haskell
 168     * hgit2 <https://github.com/fpco/gitlib>
 169 * Java
 170     * Jagged <https://github.com/ethomson/jagged>
 171 * Julia
 172     * LibGit2.jl <https://github.com/jakebolewski/LibGit2.jl>
 173 * Lua
 174     * luagit2 <https://github.com/libgit2/luagit2>
 175 * .NET
 176     * libgit2sharp <https://github.com/libgit2/libgit2sharp>
 177 * Node.js
 178     * node-gitteh <https://github.com/libgit2/node-gitteh>
 179     * nodegit <https://github.com/tbranyen/nodegit>
 180 * Objective-C
 181     * objective-git <https://github.com/libgit2/objective-git>
 182 * OCaml
 183     * libgit2-ocaml <https://github.com/burdges/libgit2-ocaml>
 184 * Parrot Virtual Machine
 185     * parrot-libgit2 <https://github.com/letolabs/parrot-libgit2>
 186 * Perl
 187     * Git-Raw <https://github.com/jacquesg/p5-Git-Raw>
 188 * PHP
 189     * php-git <https://github.com/libgit2/php-git>
 190 * PowerShell
 191     * GitPowerShell <https://github.com/ethomson/gitpowershell>
 192 * Python
 193     * pygit2 <https://github.com/libgit2/pygit2>
 194 * R
 195     * git2r <https://github.com/ropensci/git2r>
 196 * Ruby
 197     * Rugged <https://github.com/libgit2/rugged>
 198 * Rust
 199     * git2-rs <https://github.com/alexcrichton/git2-rs>
 200 * Vala
 201     * libgit2.vapi <https://github.com/apmasell/vapis/blob/master/libgit2.vapi>
 202
 203 If you start another language binding to libgit2, please let us know so
 204 we can add it to the list.
 205
 206 How Can I Contribute?
 207 ==================================
 208
 209 Check the [contribution guidelines](CONTRIBUTING.md) to understand our
 210 workflow, the libgit2 [coding conventions](CONVENTIONS.md), and out list of
 211 [good starting projects](PROJECTS.md).
 212
 213 License
 214 ==================================
 215
 216 `libgit2` is under GPL2 **with linking exemption**. This means you can link to
 217 and use the library from any program, proprietary or open source; paid or
 218 gratis.  However, you cannot modify libgit2 and distribute it without
 219 supplying the source.
 220
 221 See the [COPYING file](COPYING) for the full license text.