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4b7483a2 | 1 | libgit2 - the Git linkable library |
20b5d300 | 2 | ================================== |
4b7483a2 | 3 | |
c5c8ece1 | 4 | [![Travis Build Status](https://secure.travis-ci.org/libgit2/libgit2.svg?branch=master)](http://travis-ci.org/libgit2/libgit2) |
7cfbf3b7 | 5 | [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/xvof5b4t5480a2q3/branch/master?svg=true)](https://ci.appveyor.com/project/libgit2/libgit2/branch/master) |
4caf0df0 | 6 | [![Coverity Scan Build Status](https://scan.coverity.com/projects/639/badge.svg)](https://scan.coverity.com/projects/639) |
37029314 | 7 | |
486bc366 RB |
8 | `libgit2` is a portable, pure C implementation of the Git core methods |
9 | provided as a re-entrant linkable library with a solid API, allowing you to | |
10 | write native speed custom Git applications in any language with bindings. | |
4b7483a2 | 11 | |
dcfdb977 BS |
12 | `libgit2` is licensed under a **very permissive license** (GPLv2 with a special |
13 | Linking Exception). This basically means that you can link it (unmodified) | |
14 | with any kind of software without having to release its source code. | |
15 | Additionally, the example code has been released to the public domain (see the | |
16 | [separate license](examples/COPYING) for more information). | |
b760fbf5 | 17 | |
20b5d300 | 18 | * Website: [libgit2.github.com](http://libgit2.github.com) |
3e3d332b | 19 | * StackOverflow Tag: [libgit2](http://stackoverflow.com/questions/tagged/libgit2) |
20b5d300 | 20 | * Issues: [GitHub Issues](https://github.com/libgit2/libgit2/issues) (Right here!) |
1181ca0c | 21 | * API documentation: <http://libgit2.github.com/libgit2/> |
20b5d300 | 22 | * IRC: [#libgit2](irc://irc.freenode.net/libgit2) on irc.freenode.net. |
3e3d332b | 23 | * Mailing list: The libgit2 mailing list was |
68a19ca9 | 24 | traditionally hosted in Librelist but has been deprecated. We encourage you to |
41a93cc6 | 25 | [use StackOverflow](http://stackoverflow.com/questions/tagged/libgit2) instead for any questions regarding |
68a19ca9 RB |
26 | the library, or [open an issue](https://github.com/libgit2/libgit2/issues) |
27 | on GitHub for bug reports. The mailing list archives are still available at | |
3e3d332b MW |
28 | <http://librelist.com/browser/libgit2/>. |
29 | ||
4b7483a2 SC |
30 | |
31 | What It Can Do | |
20b5d300 | 32 | ============== |
4b7483a2 | 33 | |
486bc366 RB |
34 | `libgit2` is already very usable and is being used in production for many |
35 | applications including the GitHub.com site, in Plastic SCM and also powering | |
36 | Microsoft's Visual Studio tools for Git. The library provides: | |
c5b97d5a | 37 | |
b760fbf5 | 38 | * SHA conversions, formatting and shortening |
5689a8d5 | 39 | * abstracted ODB backend system |
7548b8af | 40 | * commit, tag, tree and blob parsing, editing, and write-back |
4b7483a2 | 41 | * tree traversal |
b760fbf5 VM |
42 | * revision walking |
43 | * index file (staging area) manipulation | |
b760fbf5 | 44 | * reference management (including packed references) |
7548b8af VM |
45 | * config file management |
46 | * high level repository management | |
47 | * thread safety and reentrancy | |
48 | * descriptive and detailed error messages | |
49 | * ...and more (over 175 different API calls) | |
b760fbf5 | 50 | |
2baee9f8 CMN |
51 | Optional dependencies |
52 | ===================== | |
53 | ||
54 | While the library provides git functionality without the need for | |
55 | dependencies, it can make use of a few libraries to add to it: | |
56 | ||
57 | - pthreads (non-Windows) to enable threadsafe access as well as multi-threaded pack generation | |
58 | - OpenSSL (non-Windows) to talk over HTTPS and provide the SHA-1 functions | |
2c22193b | 59 | - LibSSH2 to enable the SSH transport |
2baee9f8 CMN |
60 | - iconv (OSX) to handle the HFS+ path encoding peculiarities |
61 | ||
ed09e044 CMN |
62 | Initialization |
63 | =============== | |
64 | ||
65 | The library needs to keep track of some global state. Call | |
66 | ||
67 | git_libgit2_init(); | |
68 | ||
69 | before calling any other libgit2 functions. You can call this function many times. A matching number of calls to | |
70 | ||
71 | git_libgit2_shutdown(); | |
72 | ||
ecf1c3c3 ET |
73 | will free the resources. Note that if you have worker threads, you should |
74 | call `git_libgit2_shutdown` *after* those threads have exited. If you | |
75 | require assistance coordinating this, simply have the worker threads call | |
76 | `git_libgit2_init` at startup and `git_libgit2_shutdown` at shutdown. | |
ed09e044 | 77 | |
15bea02c CMN |
78 | Threading |
79 | ========= | |
80 | ||
81 | See [THREADING](THREADING.md) for information | |
82 | ||
7548b8af VM |
83 | Building libgit2 - Using CMake |
84 | ============================== | |
ec821ca6 | 85 | |
20b5d300 | 86 | `libgit2` builds cleanly on most platforms without any external dependencies. |
a07d8994 | 87 | Under Unix-like systems, like Linux, \*BSD and Mac OS X, libgit2 expects `pthreads` to be available; |
bbcc7ffc VM |
88 | they should be installed by default on all systems. Under Windows, libgit2 uses the native Windows API |
89 | for threading. | |
90 | ||
1181ca0c | 91 | The `libgit2` library is built using [CMake](<https://cmake.org/>) (version 2.8 or newer) on all platforms. |
4b7483a2 | 92 | |
e0d9e12e | 93 | On most systems you can build the library using the following commands |
4b7483a2 | 94 | |
e0d9e12e VM |
95 | $ mkdir build && cd build |
96 | $ cmake .. | |
97 | $ cmake --build . | |
c5b97d5a | 98 | |
e0d9e12e VM |
99 | Alternatively you can point the CMake GUI tool to the CMakeLists.txt file and generate platform specific build project or IDE workspace. |
100 | ||
101 | To install the library you can specify the install prefix by setting: | |
4b7483a2 | 102 | |
e0d9e12e VM |
103 | $ cmake .. -DCMAKE_INSTALL_PREFIX=/install/prefix |
104 | $ cmake --build . --target install | |
4b7483a2 | 105 | |
1181ca0c | 106 | For more advanced use or questions about CMake please read <https://cmake.org/Wiki/CMake_FAQ>. |
c5b97d5a | 107 | |
7548b8af VM |
108 | The following CMake variables are declared: |
109 | ||
9795a40f | 110 | - `BIN_INSTALL_DIR`: Where to install binaries to. |
77ace82d | 111 | - `LIB_INSTALL_DIR`: Where to install libraries to. |
9795a40f | 112 | - `INCLUDE_INSTALL_DIR`: Where to install headers to. |
f0890fcc | 113 | - `BUILD_SHARED_LIBS`: Build libgit2 as a Shared Library (defaults to ON) |
221ee54b | 114 | - `BUILD_CLAR`: Build [Clar](https://github.com/vmg/clar)-based test suite (defaults to ON) |
79b0ae4e | 115 | - `THREADSAFE`: Build libgit2 with threading support (defaults to ON) |
66bf4dbc CMN |
116 | - `STDCALL`: Build libgit2 as `stdcall`. Turn off for `cdecl` (Windows; defaults to ON) |
117 | ||
118 | Compiler and linker options | |
119 | --------------------------- | |
120 | ||
121 | CMake lets you specify a few variables to control the behavior of the | |
122 | compiler and linker. These flags are rarely used but can be useful for | |
123 | 64-bit to 32-bit cross-compilation. | |
124 | ||
125 | - `CMAKE_C_FLAGS`: Set your own compiler flags | |
126 | - `CMAKE_FIND_ROOT_PATH`: Override the search path for libraries | |
127 | - `ZLIB_LIBRARY`, `OPENSSL_SSL_LIBRARY` AND `OPENSSL_CRYPTO_LIBRARY`: | |
128 | Tell CMake where to find those specific libraries | |
129 | ||
130 | MacOS X | |
131 | ------- | |
132 | ||
133 | If you want to build a universal binary for Mac OS X, CMake sets it | |
134 | all up for you if you use `-DCMAKE_OSX_ARCHITECTURES="i386;x86_64"` | |
135 | when configuring. | |
136 | ||
137 | Windows | |
138 | ------- | |
139 | ||
140 | You need to run the CMake commands from the Visual Studio command | |
141 | prompt, not the regular or Windows SDK one. Select the right generator | |
142 | for your version with the `-G "Visual Studio X" option. | |
143 | ||
1181ca0c | 144 | See [the website](http://libgit2.github.com/docs/guides/build-and-link/) |
66bf4dbc | 145 | for more detailed instructions. |
c5b97d5a | 146 | |
01cd5ae3 KA |
147 | Android |
148 | ------- | |
149 | ||
150 | Extract toolchain from NDK using, `make-standalone-toolchain.sh` script. | |
63d1fad4 NK |
151 | Optionally, crosscompile and install OpenSSL inside of it. Then create CMake |
152 | toolchain file that configures paths to your crosscompiler (substitute `{PATH}` | |
01cd5ae3 KA |
153 | with full path to the toolchain): |
154 | ||
155 | SET(CMAKE_SYSTEM_NAME Linux) | |
156 | SET(CMAKE_SYSTEM_VERSION Android) | |
775d831b | 157 | |
01cd5ae3 KA |
158 | SET(CMAKE_C_COMPILER {PATH}/bin/arm-linux-androideabi-gcc) |
159 | SET(CMAKE_CXX_COMPILER {PATH}/bin/arm-linux-androideabi-g++) | |
160 | SET(CMAKE_FIND_ROOT_PATH {PATH}/sysroot/) | |
775d831b | 161 | |
01cd5ae3 KA |
162 | SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) |
163 | SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) | |
164 | SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) | |
165 | ||
57aa839c | 166 | Add `-DCMAKE_TOOLCHAIN_FILE={pathToToolchainFile}` to cmake command |
01cd5ae3 KA |
167 | when configuring. |
168 | ||
e0d9e12e VM |
169 | Language Bindings |
170 | ================================== | |
4b7483a2 | 171 | |
e0d9e12e | 172 | Here are the bindings to libgit2 that are currently available: |
4b7483a2 | 173 | |
b8d08292 AL |
174 | * C++ |
175 | * libqgit2, Qt bindings <https://projects.kde.org/projects/playground/libs/libqgit2/> | |
0e8144fe EH |
176 | * Chicken Scheme |
177 | * chicken-git <https://wiki.call-cc.org/egg/git> | |
26127ea7 | 178 | * D |
e702dc2e | 179 | * dlibgit <https://github.com/s-ludwig/dlibgit> |
b8d08292 AL |
180 | * Delphi |
181 | * GitForDelphi <https://github.com/libgit2/GitForDelphi> | |
182 | * Erlang | |
a402179a | 183 | * Geef <https://github.com/carlosmn/geef> |
b8d08292 | 184 | * Go |
f2cda906 | 185 | * git2go <https://github.com/libgit2/git2go> |
b8d08292 | 186 | * GObject |
1ce509fe | 187 | * libgit2-glib <https://wiki.gnome.org/Projects/Libgit2-glib> |
b8d08292 | 188 | * Haskell |
1181ca0c | 189 | * hgit2 <https://github.com/jwiegley/gitlib> |
4ef9a508 ET |
190 | * Java |
191 | * Jagged <https://github.com/ethomson/jagged> | |
d747ec18 | 192 | * Julia |
193 | * LibGit2.jl <https://github.com/jakebolewski/LibGit2.jl> | |
b8d08292 AL |
194 | * Lua |
195 | * luagit2 <https://github.com/libgit2/luagit2> | |
196 | * .NET | |
b8d08292 AL |
197 | * libgit2sharp <https://github.com/libgit2/libgit2sharp> |
198 | * Node.js | |
199 | * node-gitteh <https://github.com/libgit2/node-gitteh> | |
1181ca0c | 200 | * nodegit <https://github.com/nodegit/nodegit> |
b8d08292 AL |
201 | * Objective-C |
202 | * objective-git <https://github.com/libgit2/objective-git> | |
203 | * OCaml | |
69560cc0 | 204 | * ocaml-libgit2 <https://github.com/fxfactorial/ocaml-libgit2> |
b8d08292 AL |
205 | * Parrot Virtual Machine |
206 | * parrot-libgit2 <https://github.com/letolabs/parrot-libgit2> | |
207 | * Perl | |
2ef20da0 | 208 | * Git-Raw <https://github.com/jacquesg/p5-Git-Raw> |
b8d08292 AL |
209 | * PHP |
210 | * php-git <https://github.com/libgit2/php-git> | |
4ef9a508 ET |
211 | * PowerShell |
212 | * GitPowerShell <https://github.com/ethomson/gitpowershell> | |
b8d08292 AL |
213 | * Python |
214 | * pygit2 <https://github.com/libgit2/pygit2> | |
562516ec SW |
215 | * R |
216 | * git2r <https://github.com/ropensci/git2r> | |
b8d08292 AL |
217 | * Ruby |
218 | * Rugged <https://github.com/libgit2/rugged> | |
b4913705 AC |
219 | * Rust |
220 | * git2-rs <https://github.com/alexcrichton/git2-rs> | |
35425b51 BG |
221 | * Swift |
222 | * Gift <https://github.com/modocache/Gift> | |
b8d08292 AL |
223 | * Vala |
224 | * libgit2.vapi <https://github.com/apmasell/vapis/blob/master/libgit2.vapi> | |
4b7483a2 SC |
225 | |
226 | If you start another language binding to libgit2, please let us know so | |
227 | we can add it to the list. | |
228 | ||
b8d08292 | 229 | How Can I Contribute? |
c5b97d5a SC |
230 | ================================== |
231 | ||
486bc366 | 232 | Check the [contribution guidelines](CONTRIBUTING.md) to understand our |
22829b74 | 233 | workflow, the libgit2 [coding conventions](CONVENTIONS.md), and our list of |
486bc366 | 234 | [good starting projects](PROJECTS.md). |
c5b97d5a | 235 | |
932d1baf | 236 | License |
4b7483a2 | 237 | ================================== |
486bc366 | 238 | |
18925129 | 239 | `libgit2` is under GPL2 **with linking exception**. This means you can link to |
486bc366 RB |
240 | and use the library from any program, proprietary or open source; paid or |
241 | gratis. However, you cannot modify libgit2 and distribute it without | |
4b7483a2 SC |
242 | supplying the source. |
243 | ||
486bc366 | 244 | See the [COPYING file](COPYING) for the full license text. |