Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 4932 insertions, 0 deletions

diff --git a/vendor/libgit2-sys/.cargo-checksum.json b/vendor/libgit2-sys/.cargo-checksum.json
new file mode 100644
index 000000000..a7e179111
--- /dev/null
+++ b/vendor/libgit2-sys/.cargo-checksum.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/vendor/libgit2-sys/CHANGELOG.md b/vendor/libgit2-sys/CHANGELOG.md
new file mode 100644
index 000000000..24989fdcd
--- /dev/null
+++ b/vendor/libgit2-sys/CHANGELOG.md
@@ -0,0 +1,123 @@
+# Changelog
+
+## 0.15.0+1.6.3 - 2023-04-02
+[0.14.2...0.15.0](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.14.2+1.5.1...libgit2-sys-0.15.0+1.6.3)
+
+### Added
+
+- Added bindings for `git_remote_name_is_valid`, `git_reference_name_is_valid`, and `git_tag_name_is_valid`.
+  [#882](https://github.com/rust-lang/git2-rs/pull/882)
+- Added bindings for `git_indexer` support.
+  [#911](https://github.com/rust-lang/git2-rs/pull/911)
+- Added bindings for `git_index_find_prefix`.
+  [#903](https://github.com/rust-lang/git2-rs/pull/903)
+- Added support for the deprecated group-writeable blob file mode.
+  [#887](https://github.com/rust-lang/git2-rs/pull/887)
+
+### Changed
+
+- Updated libssh2-sys from 0.2 to 0.3.
+  This brings in numerous changes, including SHA2 algorithm support with RSA.
+  [#919](https://github.com/rust-lang/git2-rs/pull/919)
+- Updated to libgit2 [1.6.3](https://github.com/libgit2/libgit2/blob/main/docs/changelog.md#v163).
+  This brings in many changes, including better SSH host key support on Windows and better SSH host key algorithm negotiation.
+  1.6.3 is now the minimum supported version.
+  [#935](https://github.com/rust-lang/git2-rs/pull/935)
+- The `GIT_DIFF_` constants have been changed to be a `git_diff_option_t` type.
+  [#935](https://github.com/rust-lang/git2-rs/pull/935)
+
+### Fixed
+
+- Fixed the rerun-if-changed build script support on Windows. This is only relevant for those working within the git2-rs source tree.
+  [#916](https://github.com/rust-lang/git2-rs/pull/916)
+
+## 0.14.2+1.5.1 - 2023-01-20
+[0.14.1...0.14.2](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.14.1+1.5.0...libgit2-sys-0.14.2+1.5.1)
+
+### Changed
+- Updated the bundled libgit2 to [1.5.1](https://github.com/libgit2/libgit2/releases/tag/v1.5.1).
+  [a233483a3952d6112653be86fb5ce65267e3d5ac](https://github.com/rust-lang/git2-rs/commit/a233483a3952d6112653be86fb5ce65267e3d5ac)
+  - Changes: [fbea439d4b6fc91c6b619d01b85ab3b7746e4c19...42e5db98b963ae503229c63e44e06e439df50e56](https://github.com/libgit2/libgit2/compare/fbea439d4b6fc91c6b619d01b85ab3b7746e4c19...42e5db98b963ae503229c63e44e06e439df50e56):
+  - Fixes [GHSA-8643-3wh5-rmjq](https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq) to validate SSH host keys.
+  - The supported libgit2 system library range is 1.5.1 to less than 1.6.0 or 1.4.5 to less than 1.5.0, which should include this fix.
+
+## 0.13.5+1.4.5 - 2023-01-20
+[0.13.4...0.13.5](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.4+1.4.2...libgit2-sys-0.13.5+1.4.5)
+
+### Changed
+- Updated the bundled libgit2 to [1.4.5](https://github.com/libgit2/libgit2/releases/tag/v1.4.5).
+  - Changes: [2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7...cd6f679af401eda1f172402006ef8265f8bd58ea](https://github.com/libgit2/libgit2/compare/2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7...cd6f679af401eda1f172402006ef8265f8bd58ea):
+  - Fixes [GHSA-8643-3wh5-rmjq](https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq) to validate SSH host keys.
+  - The supported libgit2 system library range is 1.4.5 to less than 1.5.0.
+
+## 0.14.1+1.5.0 - 2023-01-10
+[0.14.0...0.14.1](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.14.0+1.5.0...libgit2-sys-0.14.1+1.5.0)
+
+### Added
+- Added variants to `git_cert_ssh_raw_type_t`.
+  [#909](https://github.com/rust-lang/git2-rs/pull/909)
+
+## 0.14.0+1.5.0 - 2022-07-28
+[0.13.4...0.14.0](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.4+1.4.2...libgit2-sys-0.14.0+1.5.0)
+
+### Added
+- Added bindings for ownership validation.
+  [#839](https://github.com/rust-lang/git2-rs/pull/839)
+
+### Changed
+
+- Updated the bundled libgit2 to [1.5.0](https://github.com/libgit2/libgit2/releases/tag/v1.5.0).
+  [#839](https://github.com/rust-lang/git2-rs/pull/839)
+  [#858](https://github.com/rust-lang/git2-rs/pull/858)
+  - Changes: [2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7...fbea439d4b6fc91c6b619d01b85ab3b7746e4c19](https://github.com/libgit2/libgit2/compare/2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7...fbea439d4b6fc91c6b619d01b85ab3b7746e4c19):
+  - The supported libgit2 system library range is 1.4.4 to less than 1.6.0.
+  - Fixes [CVE 2022-24765](https://github.com/libgit2/libgit2/releases/tag/v1.4.3).
+
+## 0.13.4+1.4.2 - 2022-05-10
+[0.13.3...0.13.4](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.3+1.4.2...libgit2-sys-0.13.4+1.4.2)
+
+### Added
+- Added bindings for `git_commit_body`
+  [#835](https://github.com/rust-lang/git2-rs/pull/835)
+
+## 0.13.3+1.4.2 - 2022-04-27
+[0.13.2...0.13.3](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.2+1.4.2...libgit2-sys-0.13.3+1.4.2)
+
+### Changed
+- Updated the bundled libgit2 to 1.5.0-alpha.
+  [#822](https://github.com/rust-lang/git2-rs/pull/822)
+  - Changes: [182d0d1ee933de46bf0b5a6ec269bafa77aba9a2...2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7](https://github.com/libgit2/libgit2/compare/182d0d1ee933de46bf0b5a6ec269bafa77aba9a2...2a0d0bd19b5d13e2ab7f3780e094404828cbb9a7)
+- Changed the pkg-config probe to restrict linking against a version of a system-installed libgit2 to a version less than 1.5.0.
+  Previously it would allow any version above 1.4.0 which could pick up an API-breaking version.
+  [#817](https://github.com/rust-lang/git2-rs/pull/817)
+- When using pkg-config to locate libgit2, the system lib dirs are no longer added to the search path.
+  [#831](https://github.com/rust-lang/git2-rs/pull/831)
+- When using the `zlib-ng-compat` Cargo feature, `libssh2-sys` is no longer automatically included unless you also enable the `ssh` feature.
+  [#833](https://github.com/rust-lang/git2-rs/pull/833)
+
+## 0.13.2+1.4.2 - 2022-03-10
+[0.13.1...0.13.2](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.1+1.4.2...libgit2-sys-0.13.2+1.4.2)
+
+### Added
+- Added bindings for `git_odb_exists_ext`.
+  [#818](https://github.com/rust-lang/git2-rs/pull/818)
+
+## 0.13.1+1.4.2 - 2022-02-28
+[0.13.0...0.13.1](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.13.0+1.4.1...libgit2-sys-0.13.1+1.4.2)
+
+### Changed
+- Updated the bundled libgit2 to [1.4.2](https://github.com/libgit2/libgit2/releases/tag/v1.4.2).
+  [#815](https://github.com/rust-lang/git2-rs/pull/815)
+  - Changes: [fdd15bcfca6b2ec4b7ecad1aa11a396cb15bd064...182d0d1ee933de46bf0b5a6ec269bafa77aba9a2](https://github.com/libgit2/libgit2/compare/fdd15bcfca6b2ec4b7ecad1aa11a396cb15bd064...182d0d1ee933de46bf0b5a6ec269bafa77aba9a2).
+
+## 0.13.0+1.4.1 - 2022-02-24
+[0.12.26...0.13.0](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.12.26+1.3.0...libgit2-sys-0.13.0+1.4.1)
+
+### Changed
+- Changed libgit2-sys to use the presence of the `src` directory instead of `.git` to determine if it has a git submodule that needs updating.
+  [#801](https://github.com/rust-lang/git2-rs/pull/801)
+- Updated the bundled libgit2 to [1.4.1](https://github.com/libgit2/libgit2/releases/tag/v1.4.1) (see also [1.4.0](https://github.com/libgit2/libgit2/releases/tag/v1.4.0))
+  [#806](https://github.com/rust-lang/git2-rs/pull/806)
+  [#811](https://github.com/rust-lang/git2-rs/pull/811)
+  - Changes: [b7bad55e4bb0a285b073ba5e02b01d3f522fc95d...fdd15bcfca6b2ec4b7ecad1aa11a396cb15bd064](https://github.com/libgit2/libgit2/compare/b7bad55e4bb0a285b073ba5e02b01d3f522fc95d...fdd15bcfca6b2ec4b7ecad1aa11a396cb15bd064)
+  - The supported libgit2 system library range is 1.4.0 or greater.
diff --git a/vendor/libgit2-sys/Cargo.toml b/vendor/libgit2-sys/Cargo.toml
new file mode 100644
index 000000000..abfaf8441
--- /dev/null
+++ b/vendor/libgit2-sys/Cargo.toml
@@ -0,0 +1,69 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "libgit2-sys"
+version = "0.15.0+1.6.3"
+authors = [
+    "Josh Triplett <josh@joshtriplett.org>",
+    "Alex Crichton <alex@alexcrichton.com>",
+]
+build = "build.rs"
+links = "git2"
+exclude = [
+    "libgit2/ci/*",
+    "libgit2/docs/*",
+    "libgit2/examples/*",
+    "libgit2/fuzzers/*",
+    "libgit2/tests/*",
+]
+description = "Native bindings to the libgit2 library"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/git2-rs"
+
+[lib]
+name = "libgit2_sys"
+path = "lib.rs"
+
+[dependencies.libc]
+version = "0.2"
+
+[dependencies.libssh2-sys]
+version = "0.3.0"
+optional = true
+
+[dependencies.libz-sys]
+version = "1.1.0"
+features = ["libc"]
+default-features = false
+
+[build-dependencies.cc]
+version = "1.0.43"
+features = ["parallel"]
+
+[build-dependencies.pkg-config]
+version = "0.3.7"
+
+[features]
+https = ["openssl-sys"]
+ssh = ["libssh2-sys"]
+ssh_key_from_memory = []
+vendored = []
+vendored-openssl = ["openssl-sys/vendored"]
+zlib-ng-compat = [
+    "libz-sys/zlib-ng",
+    "libssh2-sys?/zlib-ng-compat",
+]
+
+[target."cfg(unix)".dependencies.openssl-sys]
+version = "0.9"
+optional = true
diff --git a/vendor/libgit2-sys/LICENSE-APACHE b/vendor/libgit2-sys/LICENSE-APACHE
new file mode 100644
index 000000000..16fe87b06
--- /dev/null
+++ b/vendor/libgit2-sys/LICENSE-APACHE
@@ -0,0 +1,201 @@
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diff --git a/vendor/libgit2-sys/LICENSE-MIT b/vendor/libgit2-sys/LICENSE-MIT
new file mode 100644
index 000000000..39e0ed660
--- /dev/null
+++ b/vendor/libgit2-sys/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/libgit2-sys/build.rs b/vendor/libgit2-sys/build.rs
new file mode 100644
index 000000000..c050fb387
--- /dev/null
+++ b/vendor/libgit2-sys/build.rs
@@ -0,0 +1,248 @@
+use std::env;
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+fn main() {
+    let https = env::var("CARGO_FEATURE_HTTPS").is_ok();
+    let ssh = env::var("CARGO_FEATURE_SSH").is_ok();
+    let vendored = env::var("CARGO_FEATURE_VENDORED").is_ok();
+    let zlib_ng_compat = env::var("CARGO_FEATURE_ZLIB_NG_COMPAT").is_ok();
+
+    // To use zlib-ng in zlib-compat mode, we have to build libgit2 ourselves.
+    let try_to_use_system_libgit2 = !vendored && !zlib_ng_compat;
+    if try_to_use_system_libgit2 {
+        let mut cfg = pkg_config::Config::new();
+        if let Ok(lib) = cfg.range_version("1.6.3".."1.7.0").probe("libgit2") {
+            for include in &lib.include_paths {
+                println!("cargo:root={}", include.display());
+            }
+            return;
+        }
+    }
+
+    println!("cargo:rustc-cfg=libgit2_vendored");
+
+    if !Path::new("libgit2/src").exists() {
+        let _ = Command::new("git")
+            .args(&["submodule", "update", "--init", "libgit2"])
+            .status();
+    }
+
+    let target = env::var("TARGET").unwrap();
+    let windows = target.contains("windows");
+    let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    let include = dst.join("include");
+    let mut cfg = cc::Build::new();
+    fs::create_dir_all(&include).unwrap();
+
+    // Copy over all header files
+    cp_r("libgit2/include", &include);
+
+    cfg.include(&include)
+        .include("libgit2/src/libgit2")
+        .include("libgit2/src/util")
+        .out_dir(dst.join("build"))
+        .warnings(false);
+
+    // Include all cross-platform C files
+    add_c_files(&mut cfg, "libgit2/src/libgit2");
+    add_c_files(&mut cfg, "libgit2/src/util");
+    add_c_files(&mut cfg, "libgit2/src/libgit2/xdiff");
+
+    // These are activated by features, but they're all unconditionally always
+    // compiled apparently and have internal #define's to make sure they're
+    // compiled correctly.
+    add_c_files(&mut cfg, "libgit2/src/libgit2/transports");
+    add_c_files(&mut cfg, "libgit2/src/libgit2/streams");
+
+    // Always use bundled http-parser for now
+    cfg.include("libgit2/deps/http-parser")
+        .file("libgit2/deps/http-parser/http_parser.c");
+
+    // Use the included PCRE regex backend.
+    //
+    // Ideally these defines would be specific to the pcre files (or placed in
+    // a config.h), but since libgit2 already has a config.h used for other
+    // reasons, just define on the command-line for everything. Perhaps there
+    // is some way with cc to have different instructions per-file?
+    cfg.define("GIT_REGEX_BUILTIN", "1")
+        .include("libgit2/deps/pcre")
+        .define("HAVE_STDINT_H", Some("1"))
+        .define("HAVE_MEMMOVE", Some("1"))
+        .define("NO_RECURSE", Some("1"))
+        .define("NEWLINE", Some("10"))
+        .define("POSIX_MALLOC_THRESHOLD", Some("10"))
+        .define("LINK_SIZE", Some("2"))
+        .define("PARENS_NEST_LIMIT", Some("250"))
+        .define("MATCH_LIMIT", Some("10000000"))
+        .define("MATCH_LIMIT_RECURSION", Some("MATCH_LIMIT"))
+        .define("MAX_NAME_SIZE", Some("32"))
+        .define("MAX_NAME_COUNT", Some("10000"));
+    // "no symbols" warning on pcre_string_utils.c is because it is only used
+    // when when COMPILE_PCRE8 is not defined, which is the default.
+    add_c_files(&mut cfg, "libgit2/deps/pcre");
+
+    cfg.file("libgit2/src/util/allocators/failalloc.c");
+    cfg.file("libgit2/src/util/allocators/stdalloc.c");
+
+    if windows {
+        add_c_files(&mut cfg, "libgit2/src/util/win32");
+        cfg.define("STRSAFE_NO_DEPRECATE", None);
+        cfg.define("WIN32", None);
+        cfg.define("_WIN32_WINNT", Some("0x0600"));
+
+        // libgit2's build system claims that forks like mingw-w64 of MinGW
+        // still want this define to use C99 stdio functions automatically.
+        // Apparently libgit2 breaks at runtime if this isn't here? Who knows!
+        if target.contains("gnu") {
+            cfg.define("__USE_MINGW_ANSI_STDIO", "1");
+        }
+    } else {
+        add_c_files(&mut cfg, "libgit2/src/util/unix");
+        cfg.flag("-fvisibility=hidden");
+    }
+    if target.contains("solaris") || target.contains("illumos") {
+        cfg.define("_POSIX_C_SOURCE", "200112L");
+        cfg.define("__EXTENSIONS__", None);
+    }
+
+    let mut features = String::new();
+
+    features.push_str("#ifndef INCLUDE_features_h\n");
+    features.push_str("#define INCLUDE_features_h\n");
+    features.push_str("#define GIT_THREADS 1\n");
+    features.push_str("#define GIT_TRACE 1\n");
+
+    if !target.contains("android") {
+        features.push_str("#define GIT_USE_NSEC 1\n");
+    }
+
+    if target.contains("apple") {
+        features.push_str("#define GIT_USE_STAT_MTIMESPEC 1\n");
+    } else {
+        features.push_str("#define GIT_USE_STAT_MTIM 1\n");
+    }
+
+    if env::var("CARGO_CFG_TARGET_POINTER_WIDTH").unwrap() == "32" {
+        features.push_str("#define GIT_ARCH_32 1\n");
+    } else {
+        features.push_str("#define GIT_ARCH_64 1\n");
+    }
+
+    if ssh {
+        if let Some(path) = env::var_os("DEP_SSH2_INCLUDE") {
+            cfg.include(path);
+        }
+        features.push_str("#define GIT_SSH 1\n");
+        features.push_str("#define GIT_SSH_MEMORY_CREDENTIALS 1\n");
+    }
+    if https {
+        features.push_str("#define GIT_HTTPS 1\n");
+
+        if windows {
+            features.push_str("#define GIT_WINHTTP 1\n");
+        } else if target.contains("apple") {
+            features.push_str("#define GIT_SECURE_TRANSPORT 1\n");
+        } else {
+            features.push_str("#define GIT_OPENSSL 1\n");
+            if let Some(path) = env::var_os("DEP_OPENSSL_INCLUDE") {
+                cfg.include(path);
+            }
+        }
+    }
+
+    // Use the CollisionDetection SHA1 implementation.
+    features.push_str("#define GIT_SHA1_COLLISIONDETECT 1\n");
+    cfg.define("SHA1DC_NO_STANDARD_INCLUDES", "1");
+    cfg.define("SHA1DC_CUSTOM_INCLUDE_SHA1_C", "\"common.h\"");
+    cfg.define("SHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C", "\"common.h\"");
+    cfg.file("libgit2/src/util/hash/collisiondetect.c");
+    cfg.file("libgit2/src/util/hash/sha1dc/sha1.c");
+    cfg.file("libgit2/src/util/hash/sha1dc/ubc_check.c");
+
+    if https {
+        if windows {
+            features.push_str("#define GIT_SHA256_WIN32 1\n");
+            cfg.file("libgit2/src/util/hash/win32.c");
+        } else if target.contains("apple") {
+            features.push_str("#define GIT_SHA256_COMMON_CRYPTO 1\n");
+            cfg.file("libgit2/src/util/hash/common_crypto.c");
+        } else {
+            features.push_str("#define GIT_SHA256_OPENSSL 1\n");
+            cfg.file("libgit2/src/util/hash/openssl.c");
+        }
+    } else {
+        features.push_str("#define GIT_SHA256_BUILTIN 1\n");
+        cfg.file("libgit2/src/util/hash/builtin.c");
+        cfg.file("libgit2/src/util/hash/rfc6234/sha224-256.c");
+    }
+
+    if let Some(path) = env::var_os("DEP_Z_INCLUDE") {
+        cfg.include(path);
+    }
+
+    if target.contains("apple") {
+        features.push_str("#define GIT_USE_ICONV 1\n");
+    }
+
+    features.push_str("#endif\n");
+    fs::write(include.join("git2_features.h"), features).unwrap();
+
+    cfg.compile("git2");
+
+    println!("cargo:root={}", dst.display());
+
+    if target.contains("windows") {
+        println!("cargo:rustc-link-lib=winhttp");
+        println!("cargo:rustc-link-lib=rpcrt4");
+        println!("cargo:rustc-link-lib=ole32");
+        println!("cargo:rustc-link-lib=crypt32");
+    }
+
+    if target.contains("apple") {
+        println!("cargo:rustc-link-lib=iconv");
+        println!("cargo:rustc-link-lib=framework=Security");
+        println!("cargo:rustc-link-lib=framework=CoreFoundation");
+    }
+
+    println!("cargo:rerun-if-changed=libgit2/include");
+    println!("cargo:rerun-if-changed=libgit2/src");
+    println!("cargo:rerun-if-changed=libgit2/deps");
+}
+
+fn cp_r(from: impl AsRef<Path>, to: impl AsRef<Path>) {
+    for e in from.as_ref().read_dir().unwrap() {
+        let e = e.unwrap();
+        let from = e.path();
+        let to = to.as_ref().join(e.file_name());
+        if e.file_type().unwrap().is_dir() {
+            fs::create_dir_all(&to).unwrap();
+            cp_r(&from, &to);
+        } else {
+            println!("{} => {}", from.display(), to.display());
+            fs::copy(&from, &to).unwrap();
+        }
+    }
+}
+
+fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
+    let path = path.as_ref();
+    if !path.exists() {
+        panic!("Path {} does not exist", path.display());
+    }
+    // sort the C files to ensure a deterministic build for reproducible builds
+    let dir = path.read_dir().unwrap();
+    let mut paths = dir.collect::<io::Result<Vec<_>>>().unwrap();
+    paths.sort_by_key(|e| e.path());
+
+    for e in paths {
+        let path = e.path();
+        if e.file_type().unwrap().is_dir() {
+            // skip dirs for now
+        } else if path.extension().and_then(|s| s.to_str()) == Some("c") {
+            build.file(&path);
+        }
+    }
+}
diff --git a/vendor/libgit2-sys/lib.rs b/vendor/libgit2-sys/lib.rs
new file mode 100644
index 000000000..ad04cac7e
--- /dev/null
+++ b/vendor/libgit2-sys/lib.rs
@@ -0,0 +1,4265 @@
+#![doc(html_root_url = "https://docs.rs/libgit2-sys/0.15")]
+#![allow(non_camel_case_types, unused_extern_crates)]
+
+// This is required to link libz when libssh2-sys is not included.
+extern crate libz_sys as libz;
+
+use libc::{c_char, c_int, c_uchar, c_uint, c_void, size_t};
+#[cfg(feature = "ssh")]
+use libssh2_sys as libssh2;
+use std::ffi::CStr;
+
+pub const GIT_OID_RAWSZ: usize = 20;
+pub const GIT_OID_HEXSZ: usize = GIT_OID_RAWSZ * 2;
+pub const GIT_CLONE_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_STASH_APPLY_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_CHECKOUT_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_MERGE_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_REMOTE_CALLBACKS_VERSION: c_uint = 1;
+pub const GIT_STATUS_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_BLAME_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_PROXY_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_SUBMODULE_UPDATE_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_ODB_BACKEND_VERSION: c_uint = 1;
+pub const GIT_REFDB_BACKEND_VERSION: c_uint = 1;
+pub const GIT_CHERRYPICK_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_APPLY_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_REVERT_OPTIONS_VERSION: c_uint = 1;
+pub const GIT_INDEXER_OPTIONS_VERSION: c_uint = 1;
+
+macro_rules! git_enum {
+    (pub enum $name:ident { $($variants:tt)* }) => {
+        #[cfg(target_env = "msvc")]
+        pub type $name = i32;
+        #[cfg(not(target_env = "msvc"))]
+        pub type $name = u32;
+        git_enum!(gen, $name, 0, $($variants)*);
+    };
+    (pub enum $name:ident: $t:ty { $($variants:tt)* }) => {
+        pub type $name = $t;
+        git_enum!(gen, $name, 0, $($variants)*);
+    };
+    (gen, $name:ident, $val:expr, $variant:ident, $($rest:tt)*) => {
+        pub const $variant: $name = $val;
+        git_enum!(gen, $name, $val+1, $($rest)*);
+    };
+    (gen, $name:ident, $val:expr, $variant:ident = $e:expr, $($rest:tt)*) => {
+        pub const $variant: $name = $e;
+        git_enum!(gen, $name, $e+1, $($rest)*);
+    };
+    (gen, $name:ident, $val:expr, ) => {}
+}
+
+pub enum git_blob {}
+pub enum git_branch_iterator {}
+pub enum git_blame {}
+pub enum git_commit {}
+pub enum git_config {}
+pub enum git_config_iterator {}
+pub enum git_index {}
+pub enum git_index_conflict_iterator {}
+pub enum git_object {}
+pub enum git_reference {}
+pub enum git_reference_iterator {}
+pub enum git_annotated_commit {}
+pub enum git_refdb {}
+pub enum git_refspec {}
+pub enum git_remote {}
+pub enum git_repository {}
+pub enum git_revwalk {}
+pub enum git_submodule {}
+pub enum git_tag {}
+pub enum git_tree {}
+pub enum git_tree_entry {}
+pub enum git_treebuilder {}
+pub enum git_push {}
+pub enum git_note {}
+pub enum git_note_iterator {}
+pub enum git_status_list {}
+pub enum git_pathspec {}
+pub enum git_pathspec_match_list {}
+pub enum git_diff {}
+pub enum git_diff_stats {}
+pub enum git_patch {}
+pub enum git_rebase {}
+pub enum git_reflog {}
+pub enum git_reflog_entry {}
+pub enum git_describe_result {}
+pub enum git_packbuilder {}
+pub enum git_odb {}
+pub enum git_odb_stream {}
+pub enum git_odb_object {}
+pub enum git_worktree {}
+pub enum git_transaction {}
+pub enum git_mailmap {}
+pub enum git_indexer {}
+
+#[repr(C)]
+pub struct git_revspec {
+    pub from: *mut git_object,
+    pub to: *mut git_object,
+    pub flags: c_uint,
+}
+
+#[repr(C)]
+pub struct git_error {
+    pub message: *mut c_char,
+    pub klass: c_int,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_oid {
+    pub id: [u8; GIT_OID_RAWSZ],
+}
+
+#[repr(C)]
+#[derive(Copy)]
+pub struct git_strarray {
+    pub strings: *mut *mut c_char,
+    pub count: size_t,
+}
+impl Clone for git_strarray {
+    fn clone(&self) -> git_strarray {
+        *self
+    }
+}
+
+#[repr(C)]
+#[derive(Copy)]
+pub struct git_oidarray {
+    pub ids: *mut git_oid,
+    pub count: size_t,
+}
+impl Clone for git_oidarray {
+    fn clone(&self) -> git_oidarray {
+        *self
+    }
+}
+
+#[repr(C)]
+pub struct git_signature {
+    pub name: *mut c_char,
+    pub email: *mut c_char,
+    pub when: git_time,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct git_time {
+    pub time: git_time_t,
+    pub offset: c_int,
+    pub sign: c_char,
+}
+
+pub type git_off_t = i64;
+pub type git_time_t = i64;
+pub type git_object_size_t = u64;
+
+git_enum! {
+    pub enum git_revparse_mode_t {
+        GIT_REVPARSE_SINGLE = 1 << 0,
+        GIT_REVPARSE_RANGE = 1 << 1,
+        GIT_REVPARSE_MERGE_BASE = 1 << 2,
+    }
+}
+
+git_enum! {
+    pub enum git_error_code: c_int {
+        GIT_OK = 0,
+
+        GIT_ERROR = -1,
+        GIT_ENOTFOUND = -3,
+        GIT_EEXISTS = -4,
+        GIT_EAMBIGUOUS = -5,
+        GIT_EBUFS = -6,
+        GIT_EUSER = -7,
+        GIT_EBAREREPO = -8,
+        GIT_EUNBORNBRANCH = -9,
+        GIT_EUNMERGED = -10,
+        GIT_ENONFASTFORWARD = -11,
+        GIT_EINVALIDSPEC = -12,
+        GIT_ECONFLICT = -13,
+        GIT_ELOCKED = -14,
+        GIT_EMODIFIED = -15,
+        GIT_EAUTH = -16,
+        GIT_ECERTIFICATE = -17,
+        GIT_EAPPLIED = -18,
+        GIT_EPEEL = -19,
+        GIT_EEOF = -20,
+        GIT_EINVALID = -21,
+        GIT_EUNCOMMITTED = -22,
+        GIT_EDIRECTORY = -23,
+        GIT_EMERGECONFLICT = -24,
+        GIT_PASSTHROUGH = -30,
+        GIT_ITEROVER = -31,
+        GIT_RETRY = -32,
+        GIT_EMISMATCH = -33,
+        GIT_EINDEXDIRTY = -34,
+        GIT_EAPPLYFAIL = -35,
+        GIT_EOWNER = -36,
+    }
+}
+
+git_enum! {
+    pub enum git_error_t {
+        GIT_ERROR_NONE = 0,
+        GIT_ERROR_NOMEMORY,
+        GIT_ERROR_OS,
+        GIT_ERROR_INVALID,
+        GIT_ERROR_REFERENCE,
+        GIT_ERROR_ZLIB,
+        GIT_ERROR_REPOSITORY,
+        GIT_ERROR_CONFIG,
+        GIT_ERROR_REGEX,
+        GIT_ERROR_ODB,
+        GIT_ERROR_INDEX,
+        GIT_ERROR_OBJECT,
+        GIT_ERROR_NET,
+        GIT_ERROR_TAG,
+        GIT_ERROR_TREE,
+        GIT_ERROR_INDEXER,
+        GIT_ERROR_SSL,
+        GIT_ERROR_SUBMODULE,
+        GIT_ERROR_THREAD,
+        GIT_ERROR_STASH,
+        GIT_ERROR_CHECKOUT,
+        GIT_ERROR_FETCHHEAD,
+        GIT_ERROR_MERGE,
+        GIT_ERROR_SSH,
+        GIT_ERROR_FILTER,
+        GIT_ERROR_REVERT,
+        GIT_ERROR_CALLBACK,
+        GIT_ERROR_CHERRYPICK,
+        GIT_ERROR_DESCRIBE,
+        GIT_ERROR_REBASE,
+        GIT_ERROR_FILESYSTEM,
+        GIT_ERROR_PATCH,
+        GIT_ERROR_WORKTREE,
+        GIT_ERROR_SHA1,
+        GIT_ERROR_HTTP,
+    }
+}
+
+git_enum! {
+    pub enum git_repository_state_t {
+        GIT_REPOSITORY_STATE_NONE,
+        GIT_REPOSITORY_STATE_MERGE,
+        GIT_REPOSITORY_STATE_REVERT,
+        GIT_REPOSITORY_STATE_REVERT_SEQUENCE,
+        GIT_REPOSITORY_STATE_CHERRYPICK,
+        GIT_REPOSITORY_STATE_CHERRYPICK_SEQUENCE,
+        GIT_REPOSITORY_STATE_BISECT,
+        GIT_REPOSITORY_STATE_REBASE,
+        GIT_REPOSITORY_STATE_REBASE_INTERACTIVE,
+        GIT_REPOSITORY_STATE_REBASE_MERGE,
+        GIT_REPOSITORY_STATE_APPLY_MAILBOX,
+        GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE,
+    }
+}
+
+git_enum! {
+    pub enum git_direction {
+        GIT_DIRECTION_FETCH,
+        GIT_DIRECTION_PUSH,
+    }
+}
+
+#[repr(C)]
+pub struct git_clone_options {
+    pub version: c_uint,
+    pub checkout_opts: git_checkout_options,
+    pub fetch_opts: git_fetch_options,
+    pub bare: c_int,
+    pub local: git_clone_local_t,
+    pub checkout_branch: *const c_char,
+    pub repository_cb: git_repository_create_cb,
+    pub repository_cb_payload: *mut c_void,
+    pub remote_cb: git_remote_create_cb,
+    pub remote_cb_payload: *mut c_void,
+}
+
+git_enum! {
+    pub enum git_clone_local_t {
+        GIT_CLONE_LOCAL_AUTO,
+        GIT_CLONE_LOCAL,
+        GIT_CLONE_NO_LOCAL,
+        GIT_CLONE_LOCAL_NO_LINKS,
+    }
+}
+
+#[repr(C)]
+pub struct git_checkout_options {
+    pub version: c_uint,
+    pub checkout_strategy: c_uint,
+    pub disable_filters: c_int,
+    pub dir_mode: c_uint,
+    pub file_mode: c_uint,
+    pub file_open_flags: c_int,
+    pub notify_flags: c_uint,
+    pub notify_cb: git_checkout_notify_cb,
+    pub notify_payload: *mut c_void,
+    pub progress_cb: git_checkout_progress_cb,
+    pub progress_payload: *mut c_void,
+    pub paths: git_strarray,
+    pub baseline: *mut git_tree,
+    pub baseline_index: *mut git_index,
+    pub target_directory: *const c_char,
+    pub ancestor_label: *const c_char,
+    pub our_label: *const c_char,
+    pub their_label: *const c_char,
+    pub perfdata_cb: git_checkout_perfdata_cb,
+    pub perfdata_payload: *mut c_void,
+}
+
+pub type git_checkout_notify_cb = Option<
+    extern "C" fn(
+        git_checkout_notify_t,
+        *const c_char,
+        *const git_diff_file,
+        *const git_diff_file,
+        *const git_diff_file,
+        *mut c_void,
+    ) -> c_int,
+>;
+pub type git_checkout_progress_cb =
+    Option<extern "C" fn(*const c_char, size_t, size_t, *mut c_void)>;
+
+pub type git_checkout_perfdata_cb =
+    Option<extern "C" fn(*const git_checkout_perfdata, *mut c_void)>;
+
+#[repr(C)]
+pub struct git_checkout_perfdata {
+    pub mkdir_calls: size_t,
+    pub stat_calls: size_t,
+    pub chmod_calls: size_t,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Default)]
+pub struct git_indexer_progress {
+    pub total_objects: c_uint,
+    pub indexed_objects: c_uint,
+    pub received_objects: c_uint,
+    pub local_objects: c_uint,
+    pub total_deltas: c_uint,
+    pub indexed_deltas: c_uint,
+    pub received_bytes: size_t,
+}
+
+pub type git_indexer_progress_cb =
+    Option<extern "C" fn(*const git_indexer_progress, *mut c_void) -> c_int>;
+
+#[deprecated(
+    since = "0.10.0",
+    note = "renamed to `git_indexer_progress` to match upstream"
+)]
+pub type git_transfer_progress = git_indexer_progress;
+
+#[repr(C)]
+pub struct git_indexer_options {
+    pub version: c_uint,
+    pub progress_cb: git_indexer_progress_cb,
+    pub progress_cb_payload: *mut c_void,
+    pub verify: c_uchar,
+}
+
+pub type git_remote_ready_cb = Option<extern "C" fn(*mut git_remote, c_int, *mut c_void) -> c_int>;
+
+#[repr(C)]
+pub struct git_remote_callbacks {
+    pub version: c_uint,
+    pub sideband_progress: git_transport_message_cb,
+    pub completion: Option<extern "C" fn(git_remote_completion_type, *mut c_void) -> c_int>,
+    pub credentials: git_cred_acquire_cb,
+    pub certificate_check: git_transport_certificate_check_cb,
+    pub transfer_progress: git_indexer_progress_cb,
+    pub update_tips:
+        Option<extern "C" fn(*const c_char, *const git_oid, *const git_oid, *mut c_void) -> c_int>,
+    pub pack_progress: git_packbuilder_progress,
+    pub push_transfer_progress: git_push_transfer_progress,
+    pub push_update_reference: git_push_update_reference_cb,
+    pub push_negotiation: git_push_negotiation,
+    pub transport: git_transport_cb,
+    pub remote_ready: git_remote_ready_cb,
+    pub payload: *mut c_void,
+    pub resolve_url: git_url_resolve_cb,
+}
+
+#[repr(C)]
+pub struct git_fetch_options {
+    pub version: c_int,
+    pub callbacks: git_remote_callbacks,
+    pub prune: git_fetch_prune_t,
+    pub update_fetchhead: c_int,
+    pub download_tags: git_remote_autotag_option_t,
+    pub proxy_opts: git_proxy_options,
+    pub follow_redirects: git_remote_redirect_t,
+    pub custom_headers: git_strarray,
+}
+
+git_enum! {
+    pub enum git_remote_autotag_option_t {
+        GIT_REMOTE_DOWNLOAD_TAGS_UNSPECIFIED,
+        GIT_REMOTE_DOWNLOAD_TAGS_AUTO,
+        GIT_REMOTE_DOWNLOAD_TAGS_NONE,
+        GIT_REMOTE_DOWNLOAD_TAGS_ALL,
+    }
+}
+
+git_enum! {
+    pub enum git_fetch_prune_t {
+        GIT_FETCH_PRUNE_UNSPECIFIED,
+        GIT_FETCH_PRUNE,
+        GIT_FETCH_NO_PRUNE,
+    }
+}
+
+git_enum! {
+    pub enum git_remote_completion_type {
+        GIT_REMOTE_COMPLETION_DOWNLOAD,
+        GIT_REMOTE_COMPLETION_INDEXING,
+        GIT_REMOTE_COMPLETION_ERROR,
+    }
+}
+
+pub type git_transport_message_cb =
+    Option<extern "C" fn(*const c_char, c_int, *mut c_void) -> c_int>;
+pub type git_cred_acquire_cb = Option<
+    extern "C" fn(*mut *mut git_cred, *const c_char, *const c_char, c_uint, *mut c_void) -> c_int,
+>;
+pub type git_transfer_progress_cb =
+    Option<extern "C" fn(*const git_indexer_progress, *mut c_void) -> c_int>;
+pub type git_packbuilder_progress =
+    Option<extern "C" fn(git_packbuilder_stage_t, c_uint, c_uint, *mut c_void) -> c_int>;
+pub type git_push_transfer_progress =
+    Option<extern "C" fn(c_uint, c_uint, size_t, *mut c_void) -> c_int>;
+pub type git_transport_certificate_check_cb =
+    Option<extern "C" fn(*mut git_cert, c_int, *const c_char, *mut c_void) -> c_int>;
+pub type git_push_negotiation =
+    Option<extern "C" fn(*mut *const git_push_update, size_t, *mut c_void) -> c_int>;
+
+pub type git_push_update_reference_cb =
+    Option<extern "C" fn(*const c_char, *const c_char, *mut c_void) -> c_int>;
+pub type git_url_resolve_cb =
+    Option<extern "C" fn(*mut git_buf, *const c_char, c_int, *mut c_void) -> c_int>;
+
+#[repr(C)]
+pub struct git_push_update {
+    pub src_refname: *mut c_char,
+    pub dst_refname: *mut c_char,
+    pub src: git_oid,
+    pub dst: git_oid,
+}
+
+git_enum! {
+    pub enum git_cert_t {
+        GIT_CERT_NONE,
+        GIT_CERT_X509,
+        GIT_CERT_HOSTKEY_LIBSSH2,
+        GIT_CERT_STRARRAY,
+    }
+}
+
+#[repr(C)]
+pub struct git_cert {
+    pub cert_type: git_cert_t,
+}
+
+#[repr(C)]
+pub struct git_cert_hostkey {
+    pub parent: git_cert,
+    pub kind: git_cert_ssh_t,
+    pub hash_md5: [u8; 16],
+    pub hash_sha1: [u8; 20],
+    pub hash_sha256: [u8; 32],
+    pub raw_type: git_cert_ssh_raw_type_t,
+    pub hostkey: *const c_char,
+    pub hostkey_len: size_t,
+}
+
+#[repr(C)]
+pub struct git_cert_x509 {
+    pub parent: git_cert,
+    pub data: *mut c_void,
+    pub len: size_t,
+}
+
+git_enum! {
+    pub enum git_cert_ssh_t {
+        GIT_CERT_SSH_MD5 = 1 << 0,
+        GIT_CERT_SSH_SHA1 = 1 << 1,
+        GIT_CERT_SSH_SHA256 = 1 << 2,
+        GIT_CERT_SSH_RAW = 1 << 3,
+    }
+}
+
+git_enum! {
+    pub enum git_cert_ssh_raw_type_t {
+        GIT_CERT_SSH_RAW_TYPE_UNKNOWN = 0,
+        GIT_CERT_SSH_RAW_TYPE_RSA = 1,
+        GIT_CERT_SSH_RAW_TYPE_DSS = 2,
+        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_256 = 3,
+        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_384 = 4,
+        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_521 = 5,
+        GIT_CERT_SSH_RAW_TYPE_KEY_ED25519 = 6,
+    }
+}
+
+git_enum! {
+    pub enum git_diff_flag_t {
+        GIT_DIFF_FLAG_BINARY     = 1 << 0,
+        GIT_DIFF_FLAG_NOT_BINARY = 1 << 1,
+        GIT_DIFF_FLAG_VALID_ID   = 1 << 2,
+        GIT_DIFF_FLAG_EXISTS     = 1 << 3,
+    }
+}
+
+#[repr(C)]
+pub struct git_diff_file {
+    pub id: git_oid,
+    pub path: *const c_char,
+    pub size: git_object_size_t,
+    pub flags: u32,
+    pub mode: u16,
+    pub id_abbrev: u16,
+}
+
+pub type git_repository_create_cb =
+    Option<extern "C" fn(*mut *mut git_repository, *const c_char, c_int, *mut c_void) -> c_int>;
+pub type git_remote_create_cb = Option<
+    extern "C" fn(
+        *mut *mut git_remote,
+        *mut git_repository,
+        *const c_char,
+        *const c_char,
+        *mut c_void,
+    ) -> c_int,
+>;
+
+git_enum! {
+    pub enum git_checkout_notify_t {
+        GIT_CHECKOUT_NOTIFY_NONE = 0,
+        GIT_CHECKOUT_NOTIFY_CONFLICT = 1 << 0,
+        GIT_CHECKOUT_NOTIFY_DIRTY = 1 << 1,
+        GIT_CHECKOUT_NOTIFY_UPDATED = 1 << 2,
+        GIT_CHECKOUT_NOTIFY_UNTRACKED = 1 << 3,
+        GIT_CHECKOUT_NOTIFY_IGNORED = 1 << 4,
+
+        GIT_CHECKOUT_NOTIFY_ALL = 0x0FFFF,
+    }
+}
+
+git_enum! {
+    pub enum git_status_t {
+        GIT_STATUS_CURRENT = 0,
+
+        GIT_STATUS_INDEX_NEW = 1 << 0,
+        GIT_STATUS_INDEX_MODIFIED = 1 << 1,
+        GIT_STATUS_INDEX_DELETED = 1 << 2,
+        GIT_STATUS_INDEX_RENAMED = 1 << 3,
+        GIT_STATUS_INDEX_TYPECHANGE = 1 << 4,
+
+        GIT_STATUS_WT_NEW = 1 << 7,
+        GIT_STATUS_WT_MODIFIED = 1 << 8,
+        GIT_STATUS_WT_DELETED = 1 << 9,
+        GIT_STATUS_WT_TYPECHANGE = 1 << 10,
+        GIT_STATUS_WT_RENAMED = 1 << 11,
+        GIT_STATUS_WT_UNREADABLE = 1 << 12,
+
+        GIT_STATUS_IGNORED = 1 << 14,
+        GIT_STATUS_CONFLICTED = 1 << 15,
+    }
+}
+
+git_enum! {
+    pub enum git_status_opt_t {
+        GIT_STATUS_OPT_INCLUDE_UNTRACKED                = 1 << 0,
+        GIT_STATUS_OPT_INCLUDE_IGNORED                  = 1 << 1,
+        GIT_STATUS_OPT_INCLUDE_UNMODIFIED               = 1 << 2,
+        GIT_STATUS_OPT_EXCLUDE_SUBMODULES               = 1 << 3,
+        GIT_STATUS_OPT_RECURSE_UNTRACKED_DIRS           = 1 << 4,
+        GIT_STATUS_OPT_DISABLE_PATHSPEC_MATCH           = 1 << 5,
+        GIT_STATUS_OPT_RECURSE_IGNORED_DIRS             = 1 << 6,
+        GIT_STATUS_OPT_RENAMES_HEAD_TO_INDEX            = 1 << 7,
+        GIT_STATUS_OPT_RENAMES_INDEX_TO_WORKDIR         = 1 << 8,
+        GIT_STATUS_OPT_SORT_CASE_SENSITIVELY            = 1 << 9,
+        GIT_STATUS_OPT_SORT_CASE_INSENSITIVELY          = 1 << 10,
+
+        GIT_STATUS_OPT_RENAMES_FROM_REWRITES            = 1 << 11,
+        GIT_STATUS_OPT_NO_REFRESH                       = 1 << 12,
+        GIT_STATUS_OPT_UPDATE_INDEX                     = 1 << 13,
+        GIT_STATUS_OPT_INCLUDE_UNREADABLE               = 1 << 14,
+        GIT_STATUS_OPT_INCLUDE_UNREADABLE_AS_UNTRACKED  = 1 << 15,
+    }
+}
+
+git_enum! {
+    pub enum git_status_show_t {
+        GIT_STATUS_SHOW_INDEX_AND_WORKDIR = 0,
+        GIT_STATUS_SHOW_INDEX_ONLY = 1,
+        GIT_STATUS_SHOW_WORKDIR_ONLY = 2,
+    }
+}
+
+git_enum! {
+    pub enum git_delta_t {
+        GIT_DELTA_UNMODIFIED,
+        GIT_DELTA_ADDED,
+        GIT_DELTA_DELETED,
+        GIT_DELTA_MODIFIED,
+        GIT_DELTA_RENAMED,
+        GIT_DELTA_COPIED,
+        GIT_DELTA_IGNORED,
+        GIT_DELTA_UNTRACKED,
+        GIT_DELTA_TYPECHANGE,
+        GIT_DELTA_UNREADABLE,
+        GIT_DELTA_CONFLICTED,
+    }
+}
+
+#[repr(C)]
+pub struct git_status_options {
+    pub version: c_uint,
+    pub show: git_status_show_t,
+    pub flags: c_uint,
+    pub pathspec: git_strarray,
+    pub baseline: *mut git_tree,
+    pub rename_threshold: u16,
+}
+
+#[repr(C)]
+pub struct git_diff_delta {
+    pub status: git_delta_t,
+    pub flags: u32,
+    pub similarity: u16,
+    pub nfiles: u16,
+    pub old_file: git_diff_file,
+    pub new_file: git_diff_file,
+}
+
+#[repr(C)]
+pub struct git_status_entry {
+    pub status: git_status_t,
+    pub head_to_index: *mut git_diff_delta,
+    pub index_to_workdir: *mut git_diff_delta,
+}
+
+git_enum! {
+    pub enum git_checkout_strategy_t {
+        GIT_CHECKOUT_NONE = 0,
+        GIT_CHECKOUT_SAFE = 1 << 0,
+        GIT_CHECKOUT_FORCE = 1 << 1,
+        GIT_CHECKOUT_RECREATE_MISSING = 1 << 2,
+        GIT_CHECKOUT_ALLOW_CONFLICTS = 1 << 4,
+        GIT_CHECKOUT_REMOVE_UNTRACKED = 1 << 5,
+        GIT_CHECKOUT_REMOVE_IGNORED = 1 << 6,
+        GIT_CHECKOUT_UPDATE_ONLY = 1 << 7,
+        GIT_CHECKOUT_DONT_UPDATE_INDEX = 1 << 8,
+        GIT_CHECKOUT_NO_REFRESH = 1 << 9,
+        GIT_CHECKOUT_SKIP_UNMERGED = 1 << 10,
+        GIT_CHECKOUT_USE_OURS = 1 << 11,
+        GIT_CHECKOUT_USE_THEIRS = 1 << 12,
+        GIT_CHECKOUT_DISABLE_PATHSPEC_MATCH = 1 << 13,
+        GIT_CHECKOUT_SKIP_LOCKED_DIRECTORIES = 1 << 18,
+        GIT_CHECKOUT_DONT_OVERWRITE_IGNORED = 1 << 19,
+        GIT_CHECKOUT_CONFLICT_STYLE_MERGE = 1 << 20,
+        GIT_CHECKOUT_CONFLICT_STYLE_DIFF3 = 1 << 21,
+
+        GIT_CHECKOUT_UPDATE_SUBMODULES = 1 << 16,
+        GIT_CHECKOUT_UPDATE_SUBMODULES_IF_CHANGED = 1 << 17,
+    }
+}
+
+git_enum! {
+    pub enum git_reset_t {
+        GIT_RESET_SOFT = 1,
+        GIT_RESET_MIXED = 2,
+        GIT_RESET_HARD = 3,
+    }
+}
+
+git_enum! {
+    pub enum git_object_t: c_int {
+        GIT_OBJECT_ANY = -2,
+        GIT_OBJECT_INVALID = -1,
+        GIT_OBJECT_COMMIT = 1,
+        GIT_OBJECT_TREE = 2,
+        GIT_OBJECT_BLOB = 3,
+        GIT_OBJECT_TAG = 4,
+        GIT_OBJECT_OFS_DELTA = 6,
+        GIT_OBJECT_REF_DELTA = 7,
+    }
+}
+
+git_enum! {
+    pub enum git_reference_t {
+        GIT_REFERENCE_INVALID = 0,
+        GIT_REFERENCE_DIRECT = 1,
+        GIT_REFERENCE_SYMBOLIC = 2,
+        GIT_REFERENCE_ALL = GIT_REFERENCE_DIRECT | GIT_REFERENCE_SYMBOLIC,
+    }
+}
+
+git_enum! {
+    pub enum git_filemode_t {
+        GIT_FILEMODE_UNREADABLE = 0o000000,
+        GIT_FILEMODE_TREE = 0o040000,
+        GIT_FILEMODE_BLOB = 0o100644,
+        GIT_FILEMODE_BLOB_GROUP_WRITABLE = 0o100664,
+        GIT_FILEMODE_BLOB_EXECUTABLE = 0o100755,
+        GIT_FILEMODE_LINK = 0o120000,
+        GIT_FILEMODE_COMMIT = 0o160000,
+    }
+}
+
+git_enum! {
+    pub enum git_treewalk_mode {
+        GIT_TREEWALK_PRE = 0,
+        GIT_TREEWALK_POST = 1,
+    }
+}
+
+pub type git_treewalk_cb =
+    Option<extern "C" fn(*const c_char, *const git_tree_entry, *mut c_void) -> c_int>;
+pub type git_treebuilder_filter_cb =
+    Option<extern "C" fn(*const git_tree_entry, *mut c_void) -> c_int>;
+
+pub type git_revwalk_hide_cb = Option<extern "C" fn(*const git_oid, *mut c_void) -> c_int>;
+
+git_enum! {
+    pub enum git_tree_update_t {
+        GIT_TREE_UPDATE_UPSERT = 0,
+        GIT_TREE_UPDATE_REMOVE = 1,
+    }
+}
+
+#[repr(C)]
+pub struct git_tree_update {
+    pub action: git_tree_update_t,
+    pub id: git_oid,
+    pub filemode: git_filemode_t,
+    pub path: *const c_char,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_buf {
+    pub ptr: *mut c_char,
+    pub reserved: size_t,
+    pub size: size_t,
+}
+
+git_enum! {
+    pub enum git_branch_t {
+        GIT_BRANCH_LOCAL = 1,
+        GIT_BRANCH_REMOTE = 2,
+        GIT_BRANCH_ALL = GIT_BRANCH_LOCAL | GIT_BRANCH_REMOTE,
+    }
+}
+
+pub const GIT_BLAME_NORMAL: u32 = 0;
+pub const GIT_BLAME_TRACK_COPIES_SAME_FILE: u32 = 1 << 0;
+pub const GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES: u32 = 1 << 1;
+pub const GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES: u32 = 1 << 2;
+pub const GIT_BLAME_TRACK_COPIES_ANY_COMMIT_COPIES: u32 = 1 << 3;
+pub const GIT_BLAME_FIRST_PARENT: u32 = 1 << 4;
+pub const GIT_BLAME_USE_MAILMAP: u32 = 1 << 5;
+pub const GIT_BLAME_IGNORE_WHITESPACE: u32 = 1 << 6;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_blame_options {
+    pub version: c_uint,
+
+    pub flags: u32,
+    pub min_match_characters: u16,
+    pub newest_commit: git_oid,
+    pub oldest_commit: git_oid,
+    pub min_line: usize,
+    pub max_line: usize,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_blame_hunk {
+    pub lines_in_hunk: usize,
+    pub final_commit_id: git_oid,
+    pub final_start_line_number: usize,
+    pub final_signature: *mut git_signature,
+    pub orig_commit_id: git_oid,
+    pub orig_path: *const c_char,
+    pub orig_start_line_number: usize,
+    pub orig_signature: *mut git_signature,
+    pub boundary: c_char,
+}
+
+pub type git_index_matched_path_cb =
+    Option<extern "C" fn(*const c_char, *const c_char, *mut c_void) -> c_int>;
+
+git_enum! {
+    pub enum git_index_entry_extended_flag_t {
+        GIT_INDEX_ENTRY_INTENT_TO_ADD     = 1 << 13,
+        GIT_INDEX_ENTRY_SKIP_WORKTREE     = 1 << 14,
+
+        GIT_INDEX_ENTRY_UPTODATE          = 1 << 2,
+    }
+}
+
+git_enum! {
+    pub enum git_index_entry_flag_t {
+        GIT_INDEX_ENTRY_EXTENDED = 0x4000,
+        GIT_INDEX_ENTRY_VALID    = 0x8000,
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_index_entry {
+    pub ctime: git_index_time,
+    pub mtime: git_index_time,
+    pub dev: u32,
+    pub ino: u32,
+    pub mode: u32,
+    pub uid: u32,
+    pub gid: u32,
+    pub file_size: u32,
+    pub id: git_oid,
+    pub flags: u16,
+    pub flags_extended: u16,
+    pub path: *const c_char,
+}
+
+pub const GIT_INDEX_ENTRY_NAMEMASK: u16 = 0xfff;
+pub const GIT_INDEX_ENTRY_STAGEMASK: u16 = 0x3000;
+pub const GIT_INDEX_ENTRY_STAGESHIFT: u16 = 12;
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct git_index_time {
+    pub seconds: i32,
+    pub nanoseconds: u32,
+}
+
+#[repr(C)]
+pub struct git_config_entry {
+    pub name: *const c_char,
+    pub value: *const c_char,
+    pub include_depth: c_uint,
+    pub level: git_config_level_t,
+    pub free: Option<extern "C" fn(*mut git_config_entry)>,
+    pub payload: *mut c_void,
+}
+
+git_enum! {
+    pub enum git_config_level_t: c_int {
+        GIT_CONFIG_LEVEL_PROGRAMDATA = 1,
+        GIT_CONFIG_LEVEL_SYSTEM = 2,
+        GIT_CONFIG_LEVEL_XDG = 3,
+        GIT_CONFIG_LEVEL_GLOBAL = 4,
+        GIT_CONFIG_LEVEL_LOCAL = 5,
+        GIT_CONFIG_LEVEL_APP = 6,
+        GIT_CONFIG_HIGHEST_LEVEL = -1,
+    }
+}
+
+git_enum! {
+    pub enum git_submodule_update_t {
+        GIT_SUBMODULE_UPDATE_CHECKOUT = 1,
+        GIT_SUBMODULE_UPDATE_REBASE   = 2,
+        GIT_SUBMODULE_UPDATE_MERGE    = 3,
+        GIT_SUBMODULE_UPDATE_NONE     = 4,
+        GIT_SUBMODULE_UPDATE_DEFAULT  = 0,
+    }
+}
+
+git_enum! {
+    pub enum git_submodule_ignore_t: c_int {
+        GIT_SUBMODULE_IGNORE_UNSPECIFIED = -1,
+
+        GIT_SUBMODULE_IGNORE_NONE      = 1,
+        GIT_SUBMODULE_IGNORE_UNTRACKED = 2,
+        GIT_SUBMODULE_IGNORE_DIRTY     = 3,
+        GIT_SUBMODULE_IGNORE_ALL       = 4,
+    }
+}
+
+pub type git_submodule_cb =
+    Option<extern "C" fn(*mut git_submodule, *const c_char, *mut c_void) -> c_int>;
+
+#[repr(C)]
+pub struct git_submodule_update_options {
+    pub version: c_uint,
+    pub checkout_opts: git_checkout_options,
+    pub fetch_opts: git_fetch_options,
+    pub allow_fetch: c_int,
+}
+
+#[repr(C)]
+pub struct git_writestream {
+    pub write: Option<extern "C" fn(*mut git_writestream, *const c_char, size_t) -> c_int>,
+    pub close: Option<extern "C" fn(*mut git_writestream) -> c_int>,
+    pub free: Option<extern "C" fn(*mut git_writestream)>,
+}
+
+git_enum! {
+    pub enum git_attr_value_t {
+        GIT_ATTR_VALUE_UNSPECIFIED = 0,
+        GIT_ATTR_VALUE_TRUE,
+        GIT_ATTR_VALUE_FALSE,
+        GIT_ATTR_VALUE_STRING,
+    }
+}
+
+pub const GIT_ATTR_CHECK_FILE_THEN_INDEX: u32 = 0;
+pub const GIT_ATTR_CHECK_INDEX_THEN_FILE: u32 = 1;
+pub const GIT_ATTR_CHECK_INDEX_ONLY: u32 = 2;
+pub const GIT_ATTR_CHECK_NO_SYSTEM: u32 = 1 << 2;
+pub const GIT_ATTR_CHECK_INCLUDE_HEAD: u32 = 1 << 3;
+
+#[repr(C)]
+pub struct git_cred {
+    pub credtype: git_credtype_t,
+    pub free: Option<extern "C" fn(*mut git_cred)>,
+}
+
+git_enum! {
+    pub enum git_credtype_t {
+        GIT_CREDTYPE_USERPASS_PLAINTEXT = 1 << 0,
+        GIT_CREDTYPE_SSH_KEY = 1 << 1,
+        GIT_CREDTYPE_SSH_CUSTOM = 1 << 2,
+        GIT_CREDTYPE_DEFAULT = 1 << 3,
+        GIT_CREDTYPE_SSH_INTERACTIVE = 1 << 4,
+        GIT_CREDTYPE_USERNAME = 1 << 5,
+        GIT_CREDTYPE_SSH_MEMORY = 1 << 6,
+    }
+}
+
+pub type git_cred_ssh_interactive_callback = Option<
+    extern "C" fn(
+        name: *const c_char,
+        name_len: c_int,
+        instruction: *const c_char,
+        instruction_len: c_int,
+        num_prompts: c_int,
+        prompts: *const LIBSSH2_USERAUTH_KBDINT_PROMPT,
+        responses: *mut LIBSSH2_USERAUTH_KBDINT_RESPONSE,
+        abstrakt: *mut *mut c_void,
+    ),
+>;
+
+pub type git_cred_sign_callback = Option<
+    extern "C" fn(
+        session: *mut LIBSSH2_SESSION,
+        sig: *mut *mut c_uchar,
+        sig_len: *mut size_t,
+        data: *const c_uchar,
+        data_len: size_t,
+        abstrakt: *mut *mut c_void,
+    ),
+>;
+
+pub enum LIBSSH2_SESSION {}
+pub enum LIBSSH2_USERAUTH_KBDINT_PROMPT {}
+pub enum LIBSSH2_USERAUTH_KBDINT_RESPONSE {}
+
+#[repr(C)]
+pub struct git_push_options {
+    pub version: c_uint,
+    pub pb_parallelism: c_uint,
+    pub callbacks: git_remote_callbacks,
+    pub proxy_opts: git_proxy_options,
+    pub follow_redirects: git_remote_redirect_t,
+    pub custom_headers: git_strarray,
+}
+
+pub type git_tag_foreach_cb =
+    Option<extern "C" fn(name: *const c_char, oid: *mut git_oid, payload: *mut c_void) -> c_int>;
+
+git_enum! {
+    pub enum git_index_add_option_t {
+        GIT_INDEX_ADD_DEFAULT = 0,
+        GIT_INDEX_ADD_FORCE = 1 << 0,
+        GIT_INDEX_ADD_DISABLE_PATHSPEC_MATCH = 1 << 1,
+        GIT_INDEX_ADD_CHECK_PATHSPEC = 1 << 2,
+    }
+}
+
+git_enum! {
+    pub enum git_repository_open_flag_t {
+        GIT_REPOSITORY_OPEN_NO_SEARCH = 1 << 0,
+        GIT_REPOSITORY_OPEN_CROSS_FS = 1 << 1,
+        GIT_REPOSITORY_OPEN_BARE = 1 << 2,
+        GIT_REPOSITORY_OPEN_NO_DOTGIT = 1 << 3,
+        GIT_REPOSITORY_OPEN_FROM_ENV = 1 << 4,
+    }
+}
+
+#[repr(C)]
+pub struct git_repository_init_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub mode: u32,
+    pub workdir_path: *const c_char,
+    pub description: *const c_char,
+    pub template_path: *const c_char,
+    pub initial_head: *const c_char,
+    pub origin_url: *const c_char,
+}
+
+pub const GIT_REPOSITORY_INIT_OPTIONS_VERSION: c_uint = 1;
+
+git_enum! {
+    pub enum git_repository_init_flag_t {
+        GIT_REPOSITORY_INIT_BARE              = 1 << 0,
+        GIT_REPOSITORY_INIT_NO_REINIT         = 1 << 1,
+        GIT_REPOSITORY_INIT_NO_DOTGIT_DIR     = 1 << 2,
+        GIT_REPOSITORY_INIT_MKDIR             = 1 << 3,
+        GIT_REPOSITORY_INIT_MKPATH            = 1 << 4,
+        GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE = 1 << 5,
+    }
+}
+
+git_enum! {
+    pub enum git_repository_init_mode_t {
+        GIT_REPOSITORY_INIT_SHARED_UMASK = 0,
+        GIT_REPOSITORY_INIT_SHARED_GROUP = 0o002775,
+        GIT_REPOSITORY_INIT_SHARED_ALL   = 0o002777,
+    }
+}
+
+git_enum! {
+    pub enum git_sort_t {
+        GIT_SORT_NONE        = 0,
+        GIT_SORT_TOPOLOGICAL = 1 << 0,
+        GIT_SORT_TIME        = 1 << 1,
+        GIT_SORT_REVERSE     = 1 << 2,
+    }
+}
+
+git_enum! {
+    pub enum git_submodule_status_t {
+        GIT_SUBMODULE_STATUS_IN_HEAD = 1 << 0,
+        GIT_SUBMODULE_STATUS_IN_INDEX = 1 << 1,
+        GIT_SUBMODULE_STATUS_IN_CONFIG = 1 << 2,
+        GIT_SUBMODULE_STATUS_IN_WD = 1 << 3,
+        GIT_SUBMODULE_STATUS_INDEX_ADDED = 1 << 4,
+        GIT_SUBMODULE_STATUS_INDEX_DELETED = 1 << 5,
+        GIT_SUBMODULE_STATUS_INDEX_MODIFIED = 1 << 6,
+        GIT_SUBMODULE_STATUS_WD_UNINITIALIZED = 1 << 7,
+        GIT_SUBMODULE_STATUS_WD_ADDED = 1 << 8,
+        GIT_SUBMODULE_STATUS_WD_DELETED = 1 << 9,
+        GIT_SUBMODULE_STATUS_WD_MODIFIED = 1 << 10,
+        GIT_SUBMODULE_STATUS_WD_INDEX_MODIFIED = 1 << 11,
+        GIT_SUBMODULE_STATUS_WD_WD_MODIFIED = 1 << 12,
+        GIT_SUBMODULE_STATUS_WD_UNTRACKED = 1 << 13,
+    }
+}
+
+#[repr(C)]
+pub struct git_remote_head {
+    pub local: c_int,
+    pub oid: git_oid,
+    pub loid: git_oid,
+    pub name: *mut c_char,
+    pub symref_target: *mut c_char,
+}
+
+git_enum! {
+    pub enum git_pathspec_flag_t {
+        GIT_PATHSPEC_DEFAULT = 0,
+        GIT_PATHSPEC_IGNORE_CASE = 1 << 0,
+        GIT_PATHSPEC_USE_CASE = 1 << 1,
+        GIT_PATHSPEC_NO_GLOB = 1 << 2,
+        GIT_PATHSPEC_NO_MATCH_ERROR = 1 << 3,
+        GIT_PATHSPEC_FIND_FAILURES = 1 << 4,
+        GIT_PATHSPEC_FAILURES_ONLY = 1 << 5,
+    }
+}
+
+pub type git_diff_file_cb = Option<extern "C" fn(*const git_diff_delta, f32, *mut c_void) -> c_int>;
+pub type git_diff_hunk_cb =
+    Option<extern "C" fn(*const git_diff_delta, *const git_diff_hunk, *mut c_void) -> c_int>;
+pub type git_diff_line_cb = Option<
+    extern "C" fn(
+        *const git_diff_delta,
+        *const git_diff_hunk,
+        *const git_diff_line,
+        *mut c_void,
+    ) -> c_int,
+>;
+pub type git_diff_binary_cb =
+    Option<extern "C" fn(*const git_diff_delta, *const git_diff_binary, *mut c_void) -> c_int>;
+
+#[repr(C)]
+pub struct git_diff_hunk {
+    pub old_start: c_int,
+    pub old_lines: c_int,
+    pub new_start: c_int,
+    pub new_lines: c_int,
+    pub header_len: size_t,
+    pub header: [c_char; 128],
+}
+
+git_enum! {
+    pub enum git_diff_line_t {
+        GIT_DIFF_LINE_CONTEXT = b' ' as git_diff_line_t,
+        GIT_DIFF_LINE_ADDITION = b'+' as git_diff_line_t,
+        GIT_DIFF_LINE_DELETION = b'-' as git_diff_line_t,
+        GIT_DIFF_LINE_CONTEXT_EOFNL = b'=' as git_diff_line_t,
+        GIT_DIFF_LINE_ADD_EOFNL = b'>' as git_diff_line_t,
+        GIT_DIFF_LINE_DEL_EOFNL = b'<' as git_diff_line_t,
+        GIT_DIFF_LINE_FILE_HDR = b'F' as git_diff_line_t,
+        GIT_DIFF_LINE_HUNK_HDR = b'H' as git_diff_line_t,
+        GIT_DIFF_LINE_BINARY = b'B' as git_diff_line_t,
+    }
+}
+
+#[repr(C)]
+pub struct git_diff_line {
+    pub origin: c_char,
+    pub old_lineno: c_int,
+    pub new_lineno: c_int,
+    pub num_lines: c_int,
+    pub content_len: size_t,
+    pub content_offset: git_off_t,
+    pub content: *const c_char,
+}
+
+#[repr(C)]
+pub struct git_diff_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub ignore_submodules: git_submodule_ignore_t,
+    pub pathspec: git_strarray,
+    pub notify_cb: git_diff_notify_cb,
+    pub progress_cb: git_diff_progress_cb,
+    pub payload: *mut c_void,
+    pub context_lines: u32,
+    pub interhunk_lines: u32,
+    pub id_abbrev: u16,
+    pub max_size: git_off_t,
+    pub old_prefix: *const c_char,
+    pub new_prefix: *const c_char,
+}
+
+git_enum! {
+    pub enum git_diff_format_t {
+        GIT_DIFF_FORMAT_PATCH = 1,
+        GIT_DIFF_FORMAT_PATCH_HEADER = 2,
+        GIT_DIFF_FORMAT_RAW = 3,
+        GIT_DIFF_FORMAT_NAME_ONLY = 4,
+        GIT_DIFF_FORMAT_NAME_STATUS = 5,
+        GIT_DIFF_FORMAT_PATCH_ID = 6,
+    }
+}
+
+git_enum! {
+    pub enum git_diff_stats_format_t {
+        GIT_DIFF_STATS_NONE = 0,
+        GIT_DIFF_STATS_FULL = 1 << 0,
+        GIT_DIFF_STATS_SHORT = 1 << 1,
+        GIT_DIFF_STATS_NUMBER = 1 << 2,
+        GIT_DIFF_STATS_INCLUDE_SUMMARY = 1 << 3,
+    }
+}
+
+pub type git_diff_notify_cb = Option<
+    extern "C" fn(*const git_diff, *const git_diff_delta, *const c_char, *mut c_void) -> c_int,
+>;
+
+pub type git_diff_progress_cb =
+    Option<extern "C" fn(*const git_diff, *const c_char, *const c_char, *mut c_void) -> c_int>;
+
+git_enum! {
+    pub enum git_diff_option_t {
+        GIT_DIFF_NORMAL = 0,
+        GIT_DIFF_REVERSE = 1 << 0,
+        GIT_DIFF_INCLUDE_IGNORED = 1 << 1,
+        GIT_DIFF_RECURSE_IGNORED_DIRS = 1 << 2,
+        GIT_DIFF_INCLUDE_UNTRACKED = 1 << 3,
+        GIT_DIFF_RECURSE_UNTRACKED_DIRS = 1 << 4,
+        GIT_DIFF_INCLUDE_UNMODIFIED = 1 << 5,
+        GIT_DIFF_INCLUDE_TYPECHANGE = 1 << 6,
+        GIT_DIFF_INCLUDE_TYPECHANGE_TREES = 1 << 7,
+        GIT_DIFF_IGNORE_FILEMODE = 1 << 8,
+        GIT_DIFF_IGNORE_SUBMODULES = 1 << 9,
+        GIT_DIFF_IGNORE_CASE = 1 << 10,
+        GIT_DIFF_DISABLE_PATHSPEC_MATCH = 1 << 12,
+        GIT_DIFF_SKIP_BINARY_CHECK = 1 << 13,
+        GIT_DIFF_ENABLE_FAST_UNTRACKED_DIRS = 1 << 14,
+        GIT_DIFF_UPDATE_INDEX = 1 << 15,
+        GIT_DIFF_INCLUDE_UNREADABLE = 1 << 16,
+        GIT_DIFF_INCLUDE_UNREADABLE_AS_UNTRACKED = 1 << 17,
+        GIT_DIFF_INDENT_HEURISTIC = 1 << 18,
+        GIT_DIFF_IGNORE_BLANK_LINES = 1 << 19,
+        GIT_DIFF_FORCE_TEXT = 1 << 20,
+        GIT_DIFF_FORCE_BINARY = 1 << 21,
+        GIT_DIFF_IGNORE_WHITESPACE = 1 << 22,
+        GIT_DIFF_IGNORE_WHITESPACE_CHANGE = 1 << 23,
+        GIT_DIFF_IGNORE_WHITESPACE_EOL = 1 << 24,
+        GIT_DIFF_SHOW_UNTRACKED_CONTENT = 1 << 25,
+        GIT_DIFF_SHOW_UNMODIFIED = 1 << 26,
+        GIT_DIFF_PATIENCE = 1 << 28,
+        GIT_DIFF_MINIMAL = 1 << 29,
+        GIT_DIFF_SHOW_BINARY = 1 << 30,
+    }
+}
+
+#[repr(C)]
+pub struct git_diff_find_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub rename_threshold: u16,
+    pub rename_from_rewrite_threshold: u16,
+    pub copy_threshold: u16,
+    pub break_rewrite_threshold: u16,
+    pub rename_limit: size_t,
+    pub metric: *mut git_diff_similarity_metric,
+}
+
+#[repr(C)]
+pub struct git_diff_similarity_metric {
+    pub file_signature: Option<
+        extern "C" fn(*mut *mut c_void, *const git_diff_file, *const c_char, *mut c_void) -> c_int,
+    >,
+    pub buffer_signature: Option<
+        extern "C" fn(
+            *mut *mut c_void,
+            *const git_diff_file,
+            *const c_char,
+            size_t,
+            *mut c_void,
+        ) -> c_int,
+    >,
+    pub free_signature: Option<extern "C" fn(*mut c_void, *mut c_void)>,
+    pub similarity:
+        Option<extern "C" fn(*mut c_int, *mut c_void, *mut c_void, *mut c_void) -> c_int>,
+    pub payload: *mut c_void,
+}
+
+pub const GIT_DIFF_FIND_OPTIONS_VERSION: c_uint = 1;
+
+pub const GIT_DIFF_FIND_BY_CONFIG: u32 = 0;
+pub const GIT_DIFF_FIND_RENAMES: u32 = 1 << 0;
+pub const GIT_DIFF_FIND_RENAMES_FROM_REWRITES: u32 = 1 << 1;
+pub const GIT_DIFF_FIND_COPIES: u32 = 1 << 2;
+pub const GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED: u32 = 1 << 3;
+pub const GIT_DIFF_FIND_REWRITES: u32 = 1 << 4;
+pub const GIT_DIFF_BREAK_REWRITES: u32 = 1 << 5;
+pub const GIT_DIFF_FIND_AND_BREAK_REWRITES: u32 = GIT_DIFF_FIND_REWRITES | GIT_DIFF_BREAK_REWRITES;
+pub const GIT_DIFF_FIND_FOR_UNTRACKED: u32 = 1 << 6;
+pub const GIT_DIFF_FIND_ALL: u32 = 0x0ff;
+pub const GIT_DIFF_FIND_IGNORE_LEADING_WHITESPACE: u32 = 0;
+pub const GIT_DIFF_FIND_IGNORE_WHITESPACE: u32 = 1 << 12;
+pub const GIT_DIFF_FIND_DONT_IGNORE_WHITESPACE: u32 = 1 << 13;
+pub const GIT_DIFF_FIND_EXACT_MATCH_ONLY: u32 = 1 << 14;
+pub const GIT_DIFF_BREAK_REWRITES_FOR_RENAMES_ONLY: u32 = 1 << 15;
+pub const GIT_DIFF_FIND_REMOVE_UNMODIFIED: u32 = 1 << 16;
+
+#[repr(C)]
+pub struct git_diff_format_email_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub patch_no: usize,
+    pub total_patches: usize,
+    pub id: *const git_oid,
+    pub summary: *const c_char,
+    pub body: *const c_char,
+    pub author: *const git_signature,
+}
+
+pub const GIT_DIFF_FORMAT_EMAIL_OPTIONS_VERSION: c_uint = 1;
+
+pub const GIT_DIFF_FORMAT_EMAIL_NONE: u32 = 0;
+pub const GIT_DIFF_FORMAT_EMAIL_EXCLUDE_SUBJECT_PATCH_MARKER: u32 = 1 << 0;
+
+#[repr(C)]
+pub struct git_diff_patchid_options {
+    pub version: c_uint,
+}
+
+pub const GIT_DIFF_PATCHID_OPTIONS_VERSION: c_uint = 1;
+
+#[repr(C)]
+pub struct git_diff_binary {
+    pub contains_data: c_uint,
+    pub old_file: git_diff_binary_file,
+    pub new_file: git_diff_binary_file,
+}
+
+#[repr(C)]
+pub struct git_diff_binary_file {
+    pub kind: git_diff_binary_t,
+    pub data: *const c_char,
+    pub datalen: size_t,
+    pub inflatedlen: size_t,
+}
+
+git_enum! {
+    pub enum git_diff_binary_t {
+        GIT_DIFF_BINARY_NONE,
+        GIT_DIFF_BINARY_LITERAL,
+        GIT_DIFF_BINARY_DELTA,
+    }
+}
+
+#[repr(C)]
+pub struct git_merge_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub rename_threshold: c_uint,
+    pub target_limit: c_uint,
+    pub metric: *mut git_diff_similarity_metric,
+    pub recursion_limit: c_uint,
+    pub default_driver: *const c_char,
+    pub file_favor: git_merge_file_favor_t,
+    pub file_flags: u32,
+}
+
+git_enum! {
+    pub enum git_merge_flag_t {
+        GIT_MERGE_FIND_RENAMES = 1 << 0,
+        GIT_MERGE_FAIL_ON_CONFLICT = 1 << 1,
+        GIT_MERGE_SKIP_REUC = 1 << 2,
+        GIT_MERGE_NO_RECURSIVE = 1 << 3,
+    }
+}
+
+git_enum! {
+    pub enum git_merge_file_favor_t {
+        GIT_MERGE_FILE_FAVOR_NORMAL = 0,
+        GIT_MERGE_FILE_FAVOR_OURS = 1,
+        GIT_MERGE_FILE_FAVOR_THEIRS = 2,
+        GIT_MERGE_FILE_FAVOR_UNION = 3,
+    }
+}
+
+git_enum! {
+    pub enum git_merge_file_flag_t {
+        GIT_MERGE_FILE_DEFAULT = 0,
+        GIT_MERGE_FILE_STYLE_MERGE = 1 << 0,
+        GIT_MERGE_FILE_STYLE_DIFF3 = 1 << 1,
+        GIT_MERGE_FILE_SIMPLIFY_ALNUM = 1 << 2,
+        GIT_MERGE_FILE_IGNORE_WHITESPACE = 1 << 3,
+        GIT_MERGE_FILE_IGNORE_WHITESPACE_CHANGE = 1 << 4,
+        GIT_MERGE_FILE_IGNORE_WHITESPACE_EOL = 1 << 5,
+        GIT_MERGE_FILE_DIFF_PATIENCE = 1 << 6,
+        GIT_MERGE_FILE_DIFF_MINIMAL = 1 << 7,
+    }
+}
+
+git_enum! {
+    pub enum git_merge_analysis_t {
+        GIT_MERGE_ANALYSIS_NONE = 0,
+        GIT_MERGE_ANALYSIS_NORMAL = 1 << 0,
+        GIT_MERGE_ANALYSIS_UP_TO_DATE = 1 << 1,
+        GIT_MERGE_ANALYSIS_FASTFORWARD = 1 << 2,
+        GIT_MERGE_ANALYSIS_UNBORN = 1 << 3,
+    }
+}
+
+git_enum! {
+    pub enum git_merge_preference_t {
+        GIT_MERGE_PREFERENCE_NONE = 0,
+        GIT_MERGE_PREFERENCE_NO_FASTFORWARD = 1 << 0,
+        GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY = 1 << 1,
+    }
+}
+
+pub type git_transport_cb = Option<
+    extern "C" fn(
+        out: *mut *mut git_transport,
+        owner: *mut git_remote,
+        param: *mut c_void,
+    ) -> c_int,
+>;
+
+#[repr(C)]
+pub struct git_transport {
+    pub version: c_uint,
+    pub connect: Option<
+        extern "C" fn(
+            transport: *mut git_transport,
+            url: *const c_char,
+            direction: c_int,
+            connect_opts: *const git_remote_connect_options,
+        ) -> c_int,
+    >,
+    pub set_connect_opts: Option<
+        extern "C" fn(
+            transport: *mut git_transport,
+            connect_opts: *const git_remote_connect_options,
+        ) -> c_int,
+    >,
+    pub capabilities:
+        Option<extern "C" fn(capabilities: *mut c_uint, transport: *mut git_transport) -> c_int>,
+    pub ls: Option<
+        extern "C" fn(
+            out: *mut *mut *const git_remote_head,
+            size: *mut size_t,
+            transport: *mut git_transport,
+        ) -> c_int,
+    >,
+    pub push: Option<extern "C" fn(transport: *mut git_transport, push: *mut git_push) -> c_int>,
+    pub negotiate_fetch: Option<
+        extern "C" fn(
+            transport: *mut git_transport,
+            repo: *mut git_repository,
+            refs: *const *const git_remote_head,
+            count: size_t,
+        ) -> c_int,
+    >,
+    pub download_pack: Option<
+        extern "C" fn(
+            transport: *mut git_transport,
+            repo: *mut git_repository,
+            stats: *mut git_indexer_progress,
+        ) -> c_int,
+    >,
+    pub is_connected: Option<extern "C" fn(transport: *mut git_transport) -> c_int>,
+    pub cancel: Option<extern "C" fn(transport: *mut git_transport)>,
+    pub close: Option<extern "C" fn(transport: *mut git_transport) -> c_int>,
+    pub free: Option<extern "C" fn(transport: *mut git_transport)>,
+}
+
+#[repr(C)]
+pub struct git_remote_connect_options {
+    pub version: c_uint,
+    pub callbacks: git_remote_callbacks,
+    pub proxy_opts: git_proxy_options,
+    pub follow_redirects: git_remote_redirect_t,
+    pub custom_headers: git_strarray,
+}
+
+git_enum! {
+    pub enum git_remote_redirect_t {
+        GIT_REMOTE_REDIRECT_NONE = 1 << 0,
+        GIT_REMOTE_REDIRECT_INITIAL = 1 << 1,
+        GIT_REMOTE_REDIRECT_ALL = 1 << 2,
+    }
+}
+
+#[repr(C)]
+pub struct git_odb_backend {
+    pub version: c_uint,
+    pub odb: *mut git_odb,
+    pub read: Option<
+        extern "C" fn(
+            *mut *mut c_void,
+            *mut size_t,
+            *mut git_object_t,
+            *mut git_odb_backend,
+            *const git_oid,
+        ) -> c_int,
+    >,
+
+    pub read_prefix: Option<
+        extern "C" fn(
+            *mut git_oid,
+            *mut *mut c_void,
+            *mut size_t,
+            *mut git_object_t,
+            *mut git_odb_backend,
+            *const git_oid,
+            size_t,
+        ) -> c_int,
+    >,
+    pub read_header: Option<
+        extern "C" fn(
+            *mut size_t,
+            *mut git_object_t,
+            *mut git_odb_backend,
+            *const git_oid,
+        ) -> c_int,
+    >,
+
+    pub write: Option<
+        extern "C" fn(
+            *mut git_odb_backend,
+            *const git_oid,
+            *const c_void,
+            size_t,
+            git_object_t,
+        ) -> c_int,
+    >,
+
+    pub writestream: Option<
+        extern "C" fn(
+            *mut *mut git_odb_stream,
+            *mut git_odb_backend,
+            git_object_size_t,
+            git_object_t,
+        ) -> c_int,
+    >,
+
+    pub readstream: Option<
+        extern "C" fn(
+            *mut *mut git_odb_stream,
+            *mut size_t,
+            *mut git_object_t,
+            *mut git_odb_backend,
+            *const git_oid,
+        ) -> c_int,
+    >,
+
+    pub exists: Option<extern "C" fn(*mut git_odb_backend, *const git_oid) -> c_int>,
+
+    pub exists_prefix:
+        Option<extern "C" fn(*mut git_oid, *mut git_odb_backend, *const git_oid, size_t) -> c_int>,
+
+    pub refresh: Option<extern "C" fn(*mut git_odb_backend) -> c_int>,
+
+    pub foreach:
+        Option<extern "C" fn(*mut git_odb_backend, git_odb_foreach_cb, *mut c_void) -> c_int>,
+
+    pub writepack: Option<
+        extern "C" fn(
+            *mut *mut git_odb_writepack,
+            *mut git_odb_backend,
+            *mut git_odb,
+            git_indexer_progress_cb,
+            *mut c_void,
+        ) -> c_int,
+    >,
+
+    pub writemidx: Option<extern "C" fn(*mut git_odb_backend) -> c_int>,
+
+    pub freshen: Option<extern "C" fn(*mut git_odb_backend, *const git_oid) -> c_int>,
+
+    pub free: Option<extern "C" fn(*mut git_odb_backend)>,
+}
+
+git_enum! {
+    pub enum git_odb_lookup_flags_t {
+        GIT_ODB_LOOKUP_NO_REFRESH = 1 << 0,
+    }
+}
+
+#[repr(C)]
+pub struct git_odb_writepack {
+    pub backend: *mut git_odb_backend,
+
+    pub append: Option<
+        extern "C" fn(
+            *mut git_odb_writepack,
+            *const c_void,
+            size_t,
+            *mut git_indexer_progress,
+        ) -> c_int,
+    >,
+
+    pub commit:
+        Option<unsafe extern "C" fn(*mut git_odb_writepack, *mut git_indexer_progress) -> c_int>,
+
+    pub free: Option<unsafe extern "C" fn(*mut git_odb_writepack)>,
+}
+
+#[repr(C)]
+pub struct git_refdb_backend {
+    pub version: c_uint,
+    pub exists: Option<extern "C" fn(*mut c_int, *mut git_refdb_backend, *const c_char) -> c_int>,
+    pub lookup: Option<
+        extern "C" fn(*mut *mut git_reference, *mut git_refdb_backend, *const c_char) -> c_int,
+    >,
+    pub iterator: Option<
+        extern "C" fn(
+            *mut *mut git_reference_iterator,
+            *mut git_refdb_backend,
+            *const c_char,
+        ) -> c_int,
+    >,
+    pub write: Option<
+        extern "C" fn(
+            *mut git_refdb_backend,
+            *const git_reference,
+            c_int,
+            *const git_signature,
+            *const c_char,
+            *const git_oid,
+            *const c_char,
+        ) -> c_int,
+    >,
+    pub rename: Option<
+        extern "C" fn(
+            *mut *mut git_reference,
+            *mut git_refdb_backend,
+            *const c_char,
+            *const c_char,
+            c_int,
+            *const git_signature,
+            *const c_char,
+        ) -> c_int,
+    >,
+    pub del: Option<
+        extern "C" fn(
+            *mut git_refdb_backend,
+            *const c_char,
+            *const git_oid,
+            *const c_char,
+        ) -> c_int,
+    >,
+    pub compress: Option<extern "C" fn(*mut git_refdb_backend) -> c_int>,
+    pub has_log: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
+    pub ensure_log: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
+    pub free: Option<extern "C" fn(*mut git_refdb_backend)>,
+    pub reflog_read:
+        Option<extern "C" fn(*mut *mut git_reflog, *mut git_refdb_backend, *const c_char) -> c_int>,
+    pub reflog_write: Option<extern "C" fn(*mut git_refdb_backend, *mut git_reflog) -> c_int>,
+    pub reflog_rename:
+        Option<extern "C" fn(*mut git_refdb_backend, *const c_char, *const c_char) -> c_int>,
+    pub reflog_delete: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
+    pub lock:
+        Option<extern "C" fn(*mut *mut c_void, *mut git_refdb_backend, *const c_char) -> c_int>,
+    pub unlock: Option<
+        extern "C" fn(
+            *mut git_refdb_backend,
+            *mut c_void,
+            c_int,
+            c_int,
+            *const git_reference,
+            *const git_signature,
+            *const c_char,
+        ) -> c_int,
+    >,
+}
+
+#[repr(C)]
+pub struct git_proxy_options {
+    pub version: c_uint,
+    pub kind: git_proxy_t,
+    pub url: *const c_char,
+    pub credentials: git_cred_acquire_cb,
+    pub certificate_check: git_transport_certificate_check_cb,
+    pub payload: *mut c_void,
+}
+
+git_enum! {
+    pub enum git_proxy_t {
+        GIT_PROXY_NONE = 0,
+        GIT_PROXY_AUTO = 1,
+        GIT_PROXY_SPECIFIED = 2,
+    }
+}
+
+git_enum! {
+    pub enum git_smart_service_t {
+        GIT_SERVICE_UPLOADPACK_LS = 1,
+        GIT_SERVICE_UPLOADPACK = 2,
+        GIT_SERVICE_RECEIVEPACK_LS = 3,
+        GIT_SERVICE_RECEIVEPACK = 4,
+    }
+}
+
+#[repr(C)]
+pub struct git_smart_subtransport_stream {
+    pub subtransport: *mut git_smart_subtransport,
+    pub read: Option<
+        extern "C" fn(
+            *mut git_smart_subtransport_stream,
+            *mut c_char,
+            size_t,
+            *mut size_t,
+        ) -> c_int,
+    >,
+    pub write:
+        Option<extern "C" fn(*mut git_smart_subtransport_stream, *const c_char, size_t) -> c_int>,
+    pub free: Option<extern "C" fn(*mut git_smart_subtransport_stream)>,
+}
+
+#[repr(C)]
+pub struct git_smart_subtransport {
+    pub action: Option<
+        extern "C" fn(
+            *mut *mut git_smart_subtransport_stream,
+            *mut git_smart_subtransport,
+            *const c_char,
+            git_smart_service_t,
+        ) -> c_int,
+    >,
+    pub close: Option<extern "C" fn(*mut git_smart_subtransport) -> c_int>,
+    pub free: Option<extern "C" fn(*mut git_smart_subtransport)>,
+}
+
+pub type git_smart_subtransport_cb = Option<
+    extern "C" fn(*mut *mut git_smart_subtransport, *mut git_transport, *mut c_void) -> c_int,
+>;
+
+#[repr(C)]
+pub struct git_smart_subtransport_definition {
+    pub callback: git_smart_subtransport_cb,
+    pub rpc: c_uint,
+    pub param: *mut c_void,
+}
+
+#[repr(C)]
+pub struct git_describe_options {
+    pub version: c_uint,
+    pub max_candidates_tags: c_uint,
+    pub describe_strategy: c_uint,
+    pub pattern: *const c_char,
+    pub only_follow_first_parent: c_int,
+    pub show_commit_oid_as_fallback: c_int,
+}
+
+git_enum! {
+    pub enum git_describe_strategy_t {
+        GIT_DESCRIBE_DEFAULT,
+        GIT_DESCRIBE_TAGS,
+        GIT_DESCRIBE_ALL,
+    }
+}
+
+#[repr(C)]
+pub struct git_describe_format_options {
+    pub version: c_uint,
+    pub abbreviated_size: c_uint,
+    pub always_use_long_format: c_int,
+    pub dirty_suffix: *const c_char,
+}
+
+git_enum! {
+    pub enum git_packbuilder_stage_t {
+        GIT_PACKBUILDER_ADDING_OBJECTS,
+        GIT_PACKBUILDER_DELTAFICATION,
+    }
+}
+
+git_enum! {
+    pub enum git_stash_flags {
+        GIT_STASH_DEFAULT = 0,
+        GIT_STASH_KEEP_INDEX = 1 << 0,
+        GIT_STASH_INCLUDE_UNTRACKED = 1 << 1,
+        GIT_STASH_INCLUDE_IGNORED = 1 << 2,
+    }
+}
+
+git_enum! {
+    pub enum git_stash_apply_flags {
+        GIT_STASH_APPLY_DEFAULT = 0,
+        GIT_STASH_APPLY_REINSTATE_INDEX = 1 << 0,
+    }
+}
+
+git_enum! {
+    pub enum git_stash_apply_progress_t {
+        GIT_STASH_APPLY_PROGRESS_NONE = 0,
+        GIT_STASH_APPLY_PROGRESS_LOADING_STASH,
+        GIT_STASH_APPLY_PROGRESS_ANALYZE_INDEX,
+        GIT_STASH_APPLY_PROGRESS_ANALYZE_MODIFIED,
+        GIT_STASH_APPLY_PROGRESS_ANALYZE_UNTRACKED,
+        GIT_STASH_APPLY_PROGRESS_CHECKOUT_UNTRACKED,
+        GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED,
+        GIT_STASH_APPLY_PROGRESS_DONE,
+    }
+}
+
+#[repr(C)]
+pub struct git_stash_apply_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub checkout_options: git_checkout_options,
+    pub progress_cb: git_stash_apply_progress_cb,
+    pub progress_payload: *mut c_void,
+}
+
+pub type git_stash_apply_progress_cb =
+    Option<extern "C" fn(progress: git_stash_apply_progress_t, payload: *mut c_void) -> c_int>;
+
+pub type git_stash_cb = Option<
+    extern "C" fn(
+        index: size_t,
+        message: *const c_char,
+        stash_id: *const git_oid,
+        payload: *mut c_void,
+    ) -> c_int,
+>;
+
+pub type git_packbuilder_foreach_cb =
+    Option<extern "C" fn(*const c_void, size_t, *mut c_void) -> c_int>;
+
+pub type git_odb_foreach_cb =
+    Option<extern "C" fn(id: *const git_oid, payload: *mut c_void) -> c_int>;
+
+pub type git_commit_signing_cb = Option<
+    extern "C" fn(
+        signature: *mut git_buf,
+        signature_field: *mut git_buf,
+        commit_content: *const c_char,
+        payload: *mut c_void,
+    ) -> c_int,
+>;
+
+pub type git_commit_create_cb = Option<
+    extern "C" fn(
+        *mut git_oid,
+        *const git_signature,
+        *const git_signature,
+        *const c_char,
+        *const c_char,
+        *const git_tree,
+        usize,
+        *const git_commit,
+        *mut c_void,
+    ) -> c_int,
+>;
+
+pub const GIT_REBASE_NO_OPERATION: usize = usize::max_value();
+
+#[repr(C)]
+pub struct git_rebase_options {
+    pub version: c_uint,
+    pub quiet: c_int,
+    pub inmemory: c_int,
+    pub rewrite_notes_ref: *const c_char,
+    pub merge_options: git_merge_options,
+    pub checkout_options: git_checkout_options,
+    pub commit_create_cb: git_commit_create_cb,
+    pub signing_cb: git_commit_signing_cb,
+    pub payload: *mut c_void,
+}
+
+git_enum! {
+    pub enum git_rebase_operation_t {
+        GIT_REBASE_OPERATION_PICK = 0,
+        GIT_REBASE_OPERATION_REWORD,
+        GIT_REBASE_OPERATION_EDIT,
+        GIT_REBASE_OPERATION_SQUASH,
+        GIT_REBASE_OPERATION_FIXUP,
+        GIT_REBASE_OPERATION_EXEC,
+    }
+}
+
+#[repr(C)]
+pub struct git_rebase_operation {
+    pub kind: git_rebase_operation_t,
+    pub id: git_oid,
+    pub exec: *const c_char,
+}
+
+#[repr(C)]
+pub struct git_cherrypick_options {
+    pub version: c_uint,
+    pub mainline: c_uint,
+    pub merge_opts: git_merge_options,
+    pub checkout_opts: git_checkout_options,
+}
+
+pub type git_revert_options = git_cherrypick_options;
+
+pub type git_apply_delta_cb =
+    Option<extern "C" fn(delta: *const git_diff_delta, payload: *mut c_void) -> c_int>;
+
+pub type git_apply_hunk_cb =
+    Option<extern "C" fn(hunk: *const git_diff_hunk, payload: *mut c_void) -> c_int>;
+
+git_enum! {
+    pub enum git_apply_flags_t {
+        GIT_APPLY_CHECK = 1<<0,
+    }
+}
+
+#[repr(C)]
+pub struct git_apply_options {
+    pub version: c_uint,
+    pub delta_cb: git_apply_delta_cb,
+    pub hunk_cb: git_apply_hunk_cb,
+    pub payload: *mut c_void,
+    pub flags: u32,
+}
+
+git_enum! {
+    pub enum git_apply_location_t {
+        GIT_APPLY_LOCATION_WORKDIR = 0,
+        GIT_APPLY_LOCATION_INDEX = 1,
+        GIT_APPLY_LOCATION_BOTH = 2,
+    }
+}
+
+git_enum! {
+    pub enum git_libgit2_opt_t {
+        GIT_OPT_GET_MWINDOW_SIZE = 0,
+        GIT_OPT_SET_MWINDOW_SIZE,
+        GIT_OPT_GET_MWINDOW_MAPPED_LIMIT,
+        GIT_OPT_SET_MWINDOW_MAPPED_LIMIT,
+        GIT_OPT_GET_SEARCH_PATH,
+        GIT_OPT_SET_SEARCH_PATH,
+        GIT_OPT_SET_CACHE_OBJECT_LIMIT,
+        GIT_OPT_SET_CACHE_MAX_SIZE,
+        GIT_OPT_ENABLE_CACHING,
+        GIT_OPT_GET_CACHED_MEMORY,
+        GIT_OPT_GET_TEMPLATE_PATH,
+        GIT_OPT_SET_TEMPLATE_PATH,
+        GIT_OPT_SET_SSL_CERT_LOCATIONS,
+        GIT_OPT_SET_USER_AGENT,
+        GIT_OPT_ENABLE_STRICT_OBJECT_CREATION,
+        GIT_OPT_ENABLE_STRICT_SYMBOLIC_REF_CREATION,
+        GIT_OPT_SET_SSL_CIPHERS,
+        GIT_OPT_GET_USER_AGENT,
+        GIT_OPT_ENABLE_OFS_DELTA,
+        GIT_OPT_ENABLE_FSYNC_GITDIR,
+        GIT_OPT_GET_WINDOWS_SHAREMODE,
+        GIT_OPT_SET_WINDOWS_SHAREMODE,
+        GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION,
+        GIT_OPT_SET_ALLOCATOR,
+        GIT_OPT_ENABLE_UNSAVED_INDEX_SAFETY,
+        GIT_OPT_GET_PACK_MAX_OBJECTS,
+        GIT_OPT_SET_PACK_MAX_OBJECTS,
+        GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS,
+        GIT_OPT_ENABLE_HTTP_EXPECT_CONTINUE,
+        GIT_OPT_GET_MWINDOW_FILE_LIMIT,
+        GIT_OPT_SET_MWINDOW_FILE_LIMIT,
+        GIT_OPT_SET_ODB_PACKED_PRIORITY,
+        GIT_OPT_SET_ODB_LOOSE_PRIORITY,
+        GIT_OPT_GET_EXTENSIONS,
+        GIT_OPT_SET_EXTENSIONS,
+        GIT_OPT_GET_OWNER_VALIDATION,
+        GIT_OPT_SET_OWNER_VALIDATION,
+    }
+}
+
+git_enum! {
+    pub enum git_reference_format_t {
+        GIT_REFERENCE_FORMAT_NORMAL = 0,
+        GIT_REFERENCE_FORMAT_ALLOW_ONELEVEL = 1 << 0,
+        GIT_REFERENCE_FORMAT_REFSPEC_PATTERN = 1 << 1,
+        GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND = 1 << 2,
+    }
+}
+
+#[repr(C)]
+pub struct git_worktree_add_options {
+    pub version: c_uint,
+    pub lock: c_int,
+    pub reference: *mut git_reference,
+    pub checkout_options: git_checkout_options,
+}
+
+pub const GIT_WORKTREE_ADD_OPTIONS_VERSION: c_uint = 1;
+
+git_enum! {
+    pub enum git_worktree_prune_t {
+        /* Prune working tree even if working tree is valid */
+        GIT_WORKTREE_PRUNE_VALID = 1 << 0,
+        /* Prune working tree even if it is locked */
+        GIT_WORKTREE_PRUNE_LOCKED = 1 << 1,
+        /* Prune checked out working tree */
+        GIT_WORKTREE_PRUNE_WORKING_TREE = 1 << 2,
+    }
+}
+
+#[repr(C)]
+pub struct git_worktree_prune_options {
+    pub version: c_uint,
+    pub flags: u32,
+}
+
+pub const GIT_WORKTREE_PRUNE_OPTIONS_VERSION: c_uint = 1;
+
+pub type git_repository_mergehead_foreach_cb =
+    Option<extern "C" fn(oid: *const git_oid, payload: *mut c_void) -> c_int>;
+
+pub type git_repository_fetchhead_foreach_cb = Option<
+    extern "C" fn(*const c_char, *const c_char, *const git_oid, c_uint, *mut c_void) -> c_int,
+>;
+
+git_enum! {
+    pub enum git_trace_level_t {
+        /* No tracing will be performed. */
+        GIT_TRACE_NONE = 0,
+
+        /* Severe errors that may impact the program's execution */
+        GIT_TRACE_FATAL = 1,
+
+        /* Errors that do not impact the program's execution */
+        GIT_TRACE_ERROR = 2,
+
+        /* Warnings that suggest abnormal data */
+        GIT_TRACE_WARN = 3,
+
+        /* Informational messages about program execution */
+        GIT_TRACE_INFO = 4,
+
+        /* Detailed data that allows for debugging */
+        GIT_TRACE_DEBUG = 5,
+
+        /* Exceptionally detailed debugging data */
+        GIT_TRACE_TRACE = 6,
+    }
+}
+
+pub type git_trace_cb = Option<extern "C" fn(level: git_trace_level_t, msg: *const c_char)>;
+
+git_enum! {
+    pub enum git_feature_t {
+        GIT_FEATURE_THREADS = 1 << 0,
+        GIT_FEATURE_HTTPS   = 1 << 1,
+        GIT_FEATURE_SSH     = 1 << 2,
+        GIT_FEATURE_NSEC    = 1 << 3,
+    }
+}
+
+#[repr(C)]
+pub struct git_message_trailer {
+    pub key: *const c_char,
+    pub value: *const c_char,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct git_message_trailer_array {
+    pub trailers: *mut git_message_trailer,
+    pub count: size_t,
+    pub _trailer_block: *mut c_char,
+}
+
+#[repr(C)]
+pub struct git_email_create_options {
+    pub version: c_uint,
+    pub flags: u32,
+    pub diff_opts: git_diff_options,
+    pub diff_find_opts: git_diff_find_options,
+    pub subject_prefix: *const c_char,
+    pub start_number: usize,
+    pub reroll_number: usize,
+}
+
+pub const GIT_EMAIL_CREATE_OPTIONS_VERSION: c_uint = 1;
+
+git_enum! {
+    pub enum git_email_create_flags_t {
+        GIT_EMAIL_CREATE_DEFAULT = 0,
+        GIT_EMAIL_CREATE_OMIT_NUMBERS = 1 << 0,
+        GIT_EMAIL_CREATE_ALWAYS_NUMBER = 1 << 1,
+        GIT_EMAIL_CREATE_NO_RENAMES = 1 << 2,
+    }
+}
+
+extern "C" {
+    // threads
+    pub fn git_libgit2_init() -> c_int;
+    pub fn git_libgit2_shutdown() -> c_int;
+
+    // repository
+    pub fn git_repository_new(out: *mut *mut git_repository) -> c_int;
+    pub fn git_repository_free(repo: *mut git_repository);
+    pub fn git_repository_open(repo: *mut *mut git_repository, path: *const c_char) -> c_int;
+    pub fn git_repository_open_bare(repo: *mut *mut git_repository, path: *const c_char) -> c_int;
+    pub fn git_repository_open_ext(
+        repo: *mut *mut git_repository,
+        path: *const c_char,
+        flags: c_uint,
+        ceiling_dirs: *const c_char,
+    ) -> c_int;
+    pub fn git_repository_open_from_worktree(
+        repo: *mut *mut git_repository,
+        worktree: *mut git_worktree,
+    ) -> c_int;
+    pub fn git_repository_wrap_odb(repo: *mut *mut git_repository, odb: *mut git_odb) -> c_int;
+    pub fn git_repository_init(
+        repo: *mut *mut git_repository,
+        path: *const c_char,
+        is_bare: c_uint,
+    ) -> c_int;
+    pub fn git_repository_init_ext(
+        out: *mut *mut git_repository,
+        repo_path: *const c_char,
+        opts: *mut git_repository_init_options,
+    ) -> c_int;
+    pub fn git_repository_init_init_options(
+        opts: *mut git_repository_init_options,
+        version: c_uint,
+    ) -> c_int;
+    pub fn git_repository_get_namespace(repo: *mut git_repository) -> *const c_char;
+    pub fn git_repository_set_namespace(
+        repo: *mut git_repository,
+        namespace: *const c_char,
+    ) -> c_int;
+    pub fn git_repository_head(out: *mut *mut git_reference, repo: *mut git_repository) -> c_int;
+    pub fn git_repository_set_head(repo: *mut git_repository, refname: *const c_char) -> c_int;
+
+    pub fn git_repository_head_detached(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_set_head_detached(
+        repo: *mut git_repository,
+        commitish: *const git_oid,
+    ) -> c_int;
+    pub fn git_repository_set_head_detached_from_annotated(
+        repo: *mut git_repository,
+        commitish: *const git_annotated_commit,
+    ) -> c_int;
+    pub fn git_repository_set_bare(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_is_worktree(repo: *const git_repository) -> c_int;
+    pub fn git_repository_is_bare(repo: *const git_repository) -> c_int;
+    pub fn git_repository_is_empty(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_is_shallow(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_path(repo: *const git_repository) -> *const c_char;
+    pub fn git_repository_state(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_workdir(repo: *const git_repository) -> *const c_char;
+    pub fn git_repository_set_workdir(
+        repo: *mut git_repository,
+        workdir: *const c_char,
+        update_gitlink: c_int,
+    ) -> c_int;
+    pub fn git_repository_index(out: *mut *mut git_index, repo: *mut git_repository) -> c_int;
+    pub fn git_repository_set_index(repo: *mut git_repository, index: *mut git_index) -> c_int;
+
+    pub fn git_repository_message(buf: *mut git_buf, repo: *mut git_repository) -> c_int;
+
+    pub fn git_repository_message_remove(repo: *mut git_repository) -> c_int;
+    pub fn git_repository_config(out: *mut *mut git_config, repo: *mut git_repository) -> c_int;
+    pub fn git_repository_set_config(repo: *mut git_repository, config: *mut git_config) -> c_int;
+    pub fn git_repository_config_snapshot(
+        out: *mut *mut git_config,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_repository_discover(
+        out: *mut git_buf,
+        start_path: *const c_char,
+        across_fs: c_int,
+        ceiling_dirs: *const c_char,
+    ) -> c_int;
+    pub fn git_repository_set_odb(repo: *mut git_repository, odb: *mut git_odb) -> c_int;
+
+    pub fn git_repository_refdb(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
+    pub fn git_repository_set_refdb(repo: *mut git_repository, refdb: *mut git_refdb) -> c_int;
+
+    pub fn git_repository_reinit_filesystem(
+        repo: *mut git_repository,
+        recurse_submodules: c_int,
+    ) -> c_int;
+    pub fn git_repository_mergehead_foreach(
+        repo: *mut git_repository,
+        callback: git_repository_mergehead_foreach_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_repository_fetchhead_foreach(
+        repo: *mut git_repository,
+        callback: git_repository_fetchhead_foreach_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_ignore_add_rule(repo: *mut git_repository, rules: *const c_char) -> c_int;
+    pub fn git_ignore_clear_internal_rules(repo: *mut git_repository) -> c_int;
+    pub fn git_ignore_path_is_ignored(
+        ignored: *mut c_int,
+        repo: *mut git_repository,
+        path: *const c_char,
+    ) -> c_int;
+
+    // revparse
+    pub fn git_revparse(
+        revspec: *mut git_revspec,
+        repo: *mut git_repository,
+        spec: *const c_char,
+    ) -> c_int;
+    pub fn git_revparse_single(
+        out: *mut *mut git_object,
+        repo: *mut git_repository,
+        spec: *const c_char,
+    ) -> c_int;
+    pub fn git_revparse_ext(
+        object_out: *mut *mut git_object,
+        reference_out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        spec: *const c_char,
+    ) -> c_int;
+
+    // object
+    pub fn git_object_dup(dest: *mut *mut git_object, source: *mut git_object) -> c_int;
+    pub fn git_object_id(obj: *const git_object) -> *const git_oid;
+    pub fn git_object_free(object: *mut git_object);
+    pub fn git_object_lookup(
+        dest: *mut *mut git_object,
+        repo: *mut git_repository,
+        id: *const git_oid,
+        kind: git_object_t,
+    ) -> c_int;
+    pub fn git_object_type(obj: *const git_object) -> git_object_t;
+    pub fn git_object_peel(
+        peeled: *mut *mut git_object,
+        object: *const git_object,
+        target_type: git_object_t,
+    ) -> c_int;
+    pub fn git_object_short_id(out: *mut git_buf, obj: *const git_object) -> c_int;
+    pub fn git_object_type2string(kind: git_object_t) -> *const c_char;
+    pub fn git_object_string2type(s: *const c_char) -> git_object_t;
+    pub fn git_object_typeisloose(kind: git_object_t) -> c_int;
+
+    // oid
+    pub fn git_oid_fromraw(out: *mut git_oid, raw: *const c_uchar) -> c_int;
+    pub fn git_oid_fromstrn(out: *mut git_oid, str: *const c_char, len: size_t) -> c_int;
+    pub fn git_oid_tostr(out: *mut c_char, n: size_t, id: *const git_oid) -> *mut c_char;
+    pub fn git_oid_cmp(a: *const git_oid, b: *const git_oid) -> c_int;
+    pub fn git_oid_equal(a: *const git_oid, b: *const git_oid) -> c_int;
+    pub fn git_oid_streq(id: *const git_oid, str: *const c_char) -> c_int;
+    pub fn git_oid_iszero(id: *const git_oid) -> c_int;
+
+    // error
+    pub fn git_error_last() -> *const git_error;
+    pub fn git_error_clear();
+    pub fn git_error_set_str(error_class: c_int, string: *const c_char) -> c_int;
+
+    // remote
+    pub fn git_remote_create(
+        out: *mut *mut git_remote,
+        repo: *mut git_repository,
+        name: *const c_char,
+        url: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_create_with_fetchspec(
+        out: *mut *mut git_remote,
+        repo: *mut git_repository,
+        name: *const c_char,
+        url: *const c_char,
+        fetch: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_lookup(
+        out: *mut *mut git_remote,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_create_anonymous(
+        out: *mut *mut git_remote,
+        repo: *mut git_repository,
+        url: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_create_detached(out: *mut *mut git_remote, url: *const c_char) -> c_int;
+    pub fn git_remote_delete(repo: *mut git_repository, name: *const c_char) -> c_int;
+    pub fn git_remote_free(remote: *mut git_remote);
+    pub fn git_remote_name(remote: *const git_remote) -> *const c_char;
+    pub fn git_remote_pushurl(remote: *const git_remote) -> *const c_char;
+    pub fn git_remote_refspec_count(remote: *const git_remote) -> size_t;
+    pub fn git_remote_url(remote: *const git_remote) -> *const c_char;
+    pub fn git_remote_connect(
+        remote: *mut git_remote,
+        dir: git_direction,
+        callbacks: *const git_remote_callbacks,
+        proxy_opts: *const git_proxy_options,
+        custom_headers: *const git_strarray,
+    ) -> c_int;
+    pub fn git_remote_connected(remote: *const git_remote) -> c_int;
+    pub fn git_remote_disconnect(remote: *mut git_remote) -> c_int;
+    pub fn git_remote_add_fetch(
+        repo: *mut git_repository,
+        remote: *const c_char,
+        refspec: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_add_push(
+        repo: *mut git_repository,
+        remote: *const c_char,
+        refspec: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_download(
+        remote: *mut git_remote,
+        refspecs: *const git_strarray,
+        opts: *const git_fetch_options,
+    ) -> c_int;
+    pub fn git_remote_stop(remote: *mut git_remote) -> c_int;
+    pub fn git_remote_dup(dest: *mut *mut git_remote, source: *mut git_remote) -> c_int;
+    pub fn git_remote_get_fetch_refspecs(
+        array: *mut git_strarray,
+        remote: *const git_remote,
+    ) -> c_int;
+    pub fn git_remote_get_push_refspecs(
+        array: *mut git_strarray,
+        remote: *const git_remote,
+    ) -> c_int;
+    pub fn git_remote_get_refspec(remote: *const git_remote, n: size_t) -> *const git_refspec;
+    pub fn git_remote_is_valid_name(remote_name: *const c_char) -> c_int;
+    pub fn git_remote_name_is_valid(valid: *mut c_int, remote_name: *const c_char) -> c_int;
+    pub fn git_remote_list(out: *mut git_strarray, repo: *mut git_repository) -> c_int;
+    pub fn git_remote_rename(
+        problems: *mut git_strarray,
+        repo: *mut git_repository,
+        name: *const c_char,
+        new_name: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_fetch(
+        remote: *mut git_remote,
+        refspecs: *const git_strarray,
+        opts: *const git_fetch_options,
+        reflog_message: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_push(
+        remote: *mut git_remote,
+        refspecs: *const git_strarray,
+        opts: *const git_push_options,
+    ) -> c_int;
+    pub fn git_remote_update_tips(
+        remote: *mut git_remote,
+        callbacks: *const git_remote_callbacks,
+        update_fetchead: c_int,
+        download_tags: git_remote_autotag_option_t,
+        reflog_message: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_set_url(
+        repo: *mut git_repository,
+        remote: *const c_char,
+        url: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_set_pushurl(
+        repo: *mut git_repository,
+        remote: *const c_char,
+        pushurl: *const c_char,
+    ) -> c_int;
+    pub fn git_remote_init_callbacks(opts: *mut git_remote_callbacks, version: c_uint) -> c_int;
+    pub fn git_fetch_init_options(opts: *mut git_fetch_options, version: c_uint) -> c_int;
+    pub fn git_remote_stats(remote: *mut git_remote) -> *const git_indexer_progress;
+    pub fn git_remote_ls(
+        out: *mut *mut *const git_remote_head,
+        size: *mut size_t,
+        remote: *mut git_remote,
+    ) -> c_int;
+    pub fn git_remote_set_autotag(
+        repo: *mut git_repository,
+        remote: *const c_char,
+        value: git_remote_autotag_option_t,
+    ) -> c_int;
+    pub fn git_remote_prune(
+        remote: *mut git_remote,
+        callbacks: *const git_remote_callbacks,
+    ) -> c_int;
+    pub fn git_remote_default_branch(out: *mut git_buf, remote: *mut git_remote) -> c_int;
+
+    // refspec
+    pub fn git_refspec_direction(spec: *const git_refspec) -> git_direction;
+    pub fn git_refspec_dst(spec: *const git_refspec) -> *const c_char;
+    pub fn git_refspec_dst_matches(spec: *const git_refspec, refname: *const c_char) -> c_int;
+    pub fn git_refspec_src(spec: *const git_refspec) -> *const c_char;
+    pub fn git_refspec_src_matches(spec: *const git_refspec, refname: *const c_char) -> c_int;
+    pub fn git_refspec_force(spec: *const git_refspec) -> c_int;
+    pub fn git_refspec_string(spec: *const git_refspec) -> *const c_char;
+    pub fn git_refspec_transform(
+        out: *mut git_buf,
+        spec: *const git_refspec,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_refspec_rtransform(
+        out: *mut git_buf,
+        spec: *const git_refspec,
+        name: *const c_char,
+    ) -> c_int;
+
+    // strarray
+    pub fn git_strarray_free(array: *mut git_strarray);
+
+    // oidarray
+    pub fn git_oidarray_free(array: *mut git_oidarray);
+
+    // signature
+    pub fn git_signature_default(out: *mut *mut git_signature, repo: *mut git_repository) -> c_int;
+    pub fn git_signature_free(sig: *mut git_signature);
+    pub fn git_signature_new(
+        out: *mut *mut git_signature,
+        name: *const c_char,
+        email: *const c_char,
+        time: git_time_t,
+        offset: c_int,
+    ) -> c_int;
+    pub fn git_signature_now(
+        out: *mut *mut git_signature,
+        name: *const c_char,
+        email: *const c_char,
+    ) -> c_int;
+    pub fn git_signature_dup(dest: *mut *mut git_signature, sig: *const git_signature) -> c_int;
+
+    // status
+    pub fn git_status_list_new(
+        out: *mut *mut git_status_list,
+        repo: *mut git_repository,
+        options: *const git_status_options,
+    ) -> c_int;
+    pub fn git_status_list_entrycount(list: *mut git_status_list) -> size_t;
+    pub fn git_status_byindex(
+        statuslist: *mut git_status_list,
+        idx: size_t,
+    ) -> *const git_status_entry;
+    pub fn git_status_list_free(list: *mut git_status_list);
+    pub fn git_status_init_options(opts: *mut git_status_options, version: c_uint) -> c_int;
+    pub fn git_status_file(
+        status_flags: *mut c_uint,
+        repo: *mut git_repository,
+        path: *const c_char,
+    ) -> c_int;
+    pub fn git_status_should_ignore(
+        ignored: *mut c_int,
+        repo: *mut git_repository,
+        path: *const c_char,
+    ) -> c_int;
+
+    // clone
+    pub fn git_clone(
+        out: *mut *mut git_repository,
+        url: *const c_char,
+        local_path: *const c_char,
+        options: *const git_clone_options,
+    ) -> c_int;
+    pub fn git_clone_init_options(opts: *mut git_clone_options, version: c_uint) -> c_int;
+
+    // reset
+    pub fn git_reset(
+        repo: *mut git_repository,
+        target: *const git_object,
+        reset_type: git_reset_t,
+        checkout_opts: *const git_checkout_options,
+    ) -> c_int;
+    pub fn git_reset_default(
+        repo: *mut git_repository,
+        target: *const git_object,
+        pathspecs: *const git_strarray,
+    ) -> c_int;
+
+    // reference
+    pub fn git_reference_cmp(ref1: *const git_reference, ref2: *const git_reference) -> c_int;
+    pub fn git_reference_delete(r: *mut git_reference) -> c_int;
+    pub fn git_reference_free(r: *mut git_reference);
+    pub fn git_reference_is_branch(r: *const git_reference) -> c_int;
+    pub fn git_reference_is_note(r: *const git_reference) -> c_int;
+    pub fn git_reference_is_remote(r: *const git_reference) -> c_int;
+    pub fn git_reference_is_tag(r: *const git_reference) -> c_int;
+    pub fn git_reference_is_valid_name(name: *const c_char) -> c_int;
+    pub fn git_reference_name_is_valid(valid: *mut c_int, refname: *const c_char) -> c_int;
+    pub fn git_reference_lookup(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_dwim(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        refname: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_name(r: *const git_reference) -> *const c_char;
+    pub fn git_reference_name_to_id(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_peel(
+        out: *mut *mut git_object,
+        r: *const git_reference,
+        otype: git_object_t,
+    ) -> c_int;
+    pub fn git_reference_rename(
+        new_ref: *mut *mut git_reference,
+        r: *mut git_reference,
+        new_name: *const c_char,
+        force: c_int,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_resolve(out: *mut *mut git_reference, r: *const git_reference) -> c_int;
+    pub fn git_reference_shorthand(r: *const git_reference) -> *const c_char;
+    pub fn git_reference_symbolic_target(r: *const git_reference) -> *const c_char;
+    pub fn git_reference_target(r: *const git_reference) -> *const git_oid;
+    pub fn git_reference_target_peel(r: *const git_reference) -> *const git_oid;
+    pub fn git_reference_set_target(
+        out: *mut *mut git_reference,
+        r: *mut git_reference,
+        id: *const git_oid,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_symbolic_set_target(
+        out: *mut *mut git_reference,
+        r: *mut git_reference,
+        target: *const c_char,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_type(r: *const git_reference) -> git_reference_t;
+    pub fn git_reference_iterator_new(
+        out: *mut *mut git_reference_iterator,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_reference_iterator_glob_new(
+        out: *mut *mut git_reference_iterator,
+        repo: *mut git_repository,
+        glob: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_iterator_free(iter: *mut git_reference_iterator);
+    pub fn git_reference_next(
+        out: *mut *mut git_reference,
+        iter: *mut git_reference_iterator,
+    ) -> c_int;
+    pub fn git_reference_next_name(
+        out: *mut *const c_char,
+        iter: *mut git_reference_iterator,
+    ) -> c_int;
+    pub fn git_reference_create(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        name: *const c_char,
+        id: *const git_oid,
+        force: c_int,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_symbolic_create(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        name: *const c_char,
+        target: *const c_char,
+        force: c_int,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_create_matching(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        name: *const c_char,
+        id: *const git_oid,
+        force: c_int,
+        current_id: *const git_oid,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_symbolic_create_matching(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        name: *const c_char,
+        target: *const c_char,
+        force: c_int,
+        current_id: *const c_char,
+        log_message: *const c_char,
+    ) -> c_int;
+    pub fn git_reference_has_log(repo: *mut git_repository, name: *const c_char) -> c_int;
+    pub fn git_reference_ensure_log(repo: *mut git_repository, name: *const c_char) -> c_int;
+    pub fn git_reference_normalize_name(
+        buffer_out: *mut c_char,
+        buffer_size: size_t,
+        name: *const c_char,
+        flags: u32,
+    ) -> c_int;
+
+    // stash
+    pub fn git_stash_save(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        stasher: *const git_signature,
+        message: *const c_char,
+        flags: c_uint,
+    ) -> c_int;
+
+    pub fn git_stash_apply_init_options(
+        opts: *mut git_stash_apply_options,
+        version: c_uint,
+    ) -> c_int;
+
+    pub fn git_stash_apply(
+        repo: *mut git_repository,
+        index: size_t,
+        options: *const git_stash_apply_options,
+    ) -> c_int;
+
+    pub fn git_stash_foreach(
+        repo: *mut git_repository,
+        callback: git_stash_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+
+    pub fn git_stash_drop(repo: *mut git_repository, index: size_t) -> c_int;
+
+    pub fn git_stash_pop(
+        repo: *mut git_repository,
+        index: size_t,
+        options: *const git_stash_apply_options,
+    ) -> c_int;
+
+    // submodules
+    pub fn git_submodule_add_finalize(submodule: *mut git_submodule) -> c_int;
+    pub fn git_submodule_add_setup(
+        submodule: *mut *mut git_submodule,
+        repo: *mut git_repository,
+        url: *const c_char,
+        path: *const c_char,
+        use_gitlink: c_int,
+    ) -> c_int;
+    pub fn git_submodule_add_to_index(submodule: *mut git_submodule, write_index: c_int) -> c_int;
+    pub fn git_submodule_branch(submodule: *mut git_submodule) -> *const c_char;
+    pub fn git_submodule_clone(
+        repo: *mut *mut git_repository,
+        submodule: *mut git_submodule,
+        opts: *const git_submodule_update_options,
+    ) -> c_int;
+    pub fn git_submodule_foreach(
+        repo: *mut git_repository,
+        callback: git_submodule_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_submodule_free(submodule: *mut git_submodule);
+    pub fn git_submodule_head_id(submodule: *mut git_submodule) -> *const git_oid;
+    pub fn git_submodule_ignore(submodule: *mut git_submodule) -> git_submodule_ignore_t;
+    pub fn git_submodule_index_id(submodule: *mut git_submodule) -> *const git_oid;
+    pub fn git_submodule_init(submodule: *mut git_submodule, overwrite: c_int) -> c_int;
+    pub fn git_submodule_repo_init(
+        repo: *mut *mut git_repository,
+        submodule: *const git_submodule,
+        use_gitlink: c_int,
+    ) -> c_int;
+    pub fn git_submodule_location(status: *mut c_uint, submodule: *mut git_submodule) -> c_int;
+    pub fn git_submodule_lookup(
+        out: *mut *mut git_submodule,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_submodule_name(submodule: *mut git_submodule) -> *const c_char;
+    pub fn git_submodule_open(
+        repo: *mut *mut git_repository,
+        submodule: *mut git_submodule,
+    ) -> c_int;
+    pub fn git_submodule_path(submodule: *mut git_submodule) -> *const c_char;
+    pub fn git_submodule_reload(submodule: *mut git_submodule, force: c_int) -> c_int;
+    pub fn git_submodule_set_ignore(
+        repo: *mut git_repository,
+        name: *const c_char,
+        ignore: git_submodule_ignore_t,
+    ) -> c_int;
+    pub fn git_submodule_set_update(
+        repo: *mut git_repository,
+        name: *const c_char,
+        update: git_submodule_update_t,
+    ) -> c_int;
+    pub fn git_submodule_set_url(
+        repo: *mut git_repository,
+        name: *const c_char,
+        url: *const c_char,
+    ) -> c_int;
+    pub fn git_submodule_sync(submodule: *mut git_submodule) -> c_int;
+    pub fn git_submodule_update_strategy(submodule: *mut git_submodule) -> git_submodule_update_t;
+    pub fn git_submodule_update(
+        submodule: *mut git_submodule,
+        init: c_int,
+        options: *mut git_submodule_update_options,
+    ) -> c_int;
+    pub fn git_submodule_update_init_options(
+        options: *mut git_submodule_update_options,
+        version: c_uint,
+    ) -> c_int;
+    pub fn git_submodule_url(submodule: *mut git_submodule) -> *const c_char;
+    pub fn git_submodule_wd_id(submodule: *mut git_submodule) -> *const git_oid;
+    pub fn git_submodule_status(
+        status: *mut c_uint,
+        repo: *mut git_repository,
+        name: *const c_char,
+        ignore: git_submodule_ignore_t,
+    ) -> c_int;
+    pub fn git_submodule_set_branch(
+        repo: *mut git_repository,
+        name: *const c_char,
+        branch: *const c_char,
+    ) -> c_int;
+
+    // blob
+    pub fn git_blob_free(blob: *mut git_blob);
+    pub fn git_blob_id(blob: *const git_blob) -> *const git_oid;
+    pub fn git_blob_is_binary(blob: *const git_blob) -> c_int;
+    pub fn git_blob_lookup(
+        blob: *mut *mut git_blob,
+        repo: *mut git_repository,
+        id: *const git_oid,
+    ) -> c_int;
+    pub fn git_blob_lookup_prefix(
+        blob: *mut *mut git_blob,
+        repo: *mut git_repository,
+        id: *const git_oid,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_blob_rawcontent(blob: *const git_blob) -> *const c_void;
+    pub fn git_blob_rawsize(blob: *const git_blob) -> git_object_size_t;
+    pub fn git_blob_create_frombuffer(
+        id: *mut git_oid,
+        repo: *mut git_repository,
+        buffer: *const c_void,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_blob_create_fromdisk(
+        id: *mut git_oid,
+        repo: *mut git_repository,
+        path: *const c_char,
+    ) -> c_int;
+    pub fn git_blob_create_fromworkdir(
+        id: *mut git_oid,
+        repo: *mut git_repository,
+        relative_path: *const c_char,
+    ) -> c_int;
+    pub fn git_blob_create_fromstream(
+        out: *mut *mut git_writestream,
+        repo: *mut git_repository,
+        hintpath: *const c_char,
+    ) -> c_int;
+    pub fn git_blob_create_fromstream_commit(
+        id: *mut git_oid,
+        stream: *mut git_writestream,
+    ) -> c_int;
+
+    // tree
+    pub fn git_tree_entry_byid(tree: *const git_tree, id: *const git_oid) -> *const git_tree_entry;
+    pub fn git_tree_entry_byindex(tree: *const git_tree, idx: size_t) -> *const git_tree_entry;
+    pub fn git_tree_entry_byname(
+        tree: *const git_tree,
+        filename: *const c_char,
+    ) -> *const git_tree_entry;
+    pub fn git_tree_entry_bypath(
+        out: *mut *mut git_tree_entry,
+        tree: *const git_tree,
+        filename: *const c_char,
+    ) -> c_int;
+    pub fn git_tree_entry_cmp(e1: *const git_tree_entry, e2: *const git_tree_entry) -> c_int;
+    pub fn git_tree_entry_dup(dest: *mut *mut git_tree_entry, src: *const git_tree_entry) -> c_int;
+    pub fn git_tree_entry_filemode(entry: *const git_tree_entry) -> git_filemode_t;
+    pub fn git_tree_entry_filemode_raw(entry: *const git_tree_entry) -> git_filemode_t;
+    pub fn git_tree_entry_free(entry: *mut git_tree_entry);
+    pub fn git_tree_entry_id(entry: *const git_tree_entry) -> *const git_oid;
+    pub fn git_tree_entry_name(entry: *const git_tree_entry) -> *const c_char;
+    pub fn git_tree_entry_to_object(
+        out: *mut *mut git_object,
+        repo: *mut git_repository,
+        entry: *const git_tree_entry,
+    ) -> c_int;
+    pub fn git_tree_entry_type(entry: *const git_tree_entry) -> git_object_t;
+    pub fn git_tree_entrycount(tree: *const git_tree) -> size_t;
+    pub fn git_tree_free(tree: *mut git_tree);
+    pub fn git_tree_id(tree: *const git_tree) -> *const git_oid;
+    pub fn git_tree_lookup(
+        tree: *mut *mut git_tree,
+        repo: *mut git_repository,
+        id: *const git_oid,
+    ) -> c_int;
+    pub fn git_tree_walk(
+        tree: *const git_tree,
+        mode: git_treewalk_mode,
+        callback: git_treewalk_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_tree_create_updated(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        baseline: *mut git_tree,
+        nupdates: usize,
+        updates: *const git_tree_update,
+    ) -> c_int;
+
+    // treebuilder
+    pub fn git_treebuilder_new(
+        out: *mut *mut git_treebuilder,
+        repo: *mut git_repository,
+        source: *const git_tree,
+    ) -> c_int;
+    pub fn git_treebuilder_clear(bld: *mut git_treebuilder) -> c_int;
+    pub fn git_treebuilder_entrycount(bld: *mut git_treebuilder) -> size_t;
+    pub fn git_treebuilder_free(bld: *mut git_treebuilder);
+    pub fn git_treebuilder_get(
+        bld: *mut git_treebuilder,
+        filename: *const c_char,
+    ) -> *const git_tree_entry;
+    pub fn git_treebuilder_insert(
+        out: *mut *const git_tree_entry,
+        bld: *mut git_treebuilder,
+        filename: *const c_char,
+        id: *const git_oid,
+        filemode: git_filemode_t,
+    ) -> c_int;
+    pub fn git_treebuilder_remove(bld: *mut git_treebuilder, filename: *const c_char) -> c_int;
+    pub fn git_treebuilder_filter(
+        bld: *mut git_treebuilder,
+        filter: git_treebuilder_filter_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_treebuilder_write(id: *mut git_oid, bld: *mut git_treebuilder) -> c_int;
+
+    // buf
+    pub fn git_buf_dispose(buffer: *mut git_buf);
+    pub fn git_buf_grow(buffer: *mut git_buf, target_size: size_t) -> c_int;
+    pub fn git_buf_set(buffer: *mut git_buf, data: *const c_void, datalen: size_t) -> c_int;
+
+    // commit
+    pub fn git_commit_author(commit: *const git_commit) -> *const git_signature;
+    pub fn git_commit_author_with_mailmap(
+        out: *mut *mut git_signature,
+        commit: *const git_commit,
+        mailmap: *const git_mailmap,
+    ) -> c_int;
+    pub fn git_commit_committer(commit: *const git_commit) -> *const git_signature;
+    pub fn git_commit_committer_with_mailmap(
+        out: *mut *mut git_signature,
+        commit: *const git_commit,
+        mailmap: *const git_mailmap,
+    ) -> c_int;
+    pub fn git_commit_free(commit: *mut git_commit);
+    pub fn git_commit_id(commit: *const git_commit) -> *const git_oid;
+    pub fn git_commit_lookup(
+        commit: *mut *mut git_commit,
+        repo: *mut git_repository,
+        id: *const git_oid,
+    ) -> c_int;
+    pub fn git_commit_message(commit: *const git_commit) -> *const c_char;
+    pub fn git_commit_message_encoding(commit: *const git_commit) -> *const c_char;
+    pub fn git_commit_message_raw(commit: *const git_commit) -> *const c_char;
+    pub fn git_commit_nth_gen_ancestor(
+        commit: *mut *mut git_commit,
+        commit: *const git_commit,
+        n: c_uint,
+    ) -> c_int;
+    pub fn git_commit_parent(
+        out: *mut *mut git_commit,
+        commit: *const git_commit,
+        n: c_uint,
+    ) -> c_int;
+    pub fn git_commit_parent_id(commit: *const git_commit, n: c_uint) -> *const git_oid;
+    pub fn git_commit_parentcount(commit: *const git_commit) -> c_uint;
+    pub fn git_commit_raw_header(commit: *const git_commit) -> *const c_char;
+    pub fn git_commit_summary(commit: *mut git_commit) -> *const c_char;
+    pub fn git_commit_body(commit: *mut git_commit) -> *const c_char;
+    pub fn git_commit_time(commit: *const git_commit) -> git_time_t;
+    pub fn git_commit_time_offset(commit: *const git_commit) -> c_int;
+    pub fn git_commit_tree(tree_out: *mut *mut git_tree, commit: *const git_commit) -> c_int;
+    pub fn git_commit_tree_id(commit: *const git_commit) -> *const git_oid;
+    pub fn git_commit_amend(
+        id: *mut git_oid,
+        commit_to_amend: *const git_commit,
+        update_ref: *const c_char,
+        author: *const git_signature,
+        committer: *const git_signature,
+        message_encoding: *const c_char,
+        message: *const c_char,
+        tree: *const git_tree,
+    ) -> c_int;
+    pub fn git_commit_create(
+        id: *mut git_oid,
+        repo: *mut git_repository,
+        update_ref: *const c_char,
+        author: *const git_signature,
+        committer: *const git_signature,
+        message_encoding: *const c_char,
+        message: *const c_char,
+        tree: *const git_tree,
+        parent_count: size_t,
+        parents: *mut *const git_commit,
+    ) -> c_int;
+    pub fn git_commit_create_buffer(
+        out: *mut git_buf,
+        repo: *mut git_repository,
+        author: *const git_signature,
+        committer: *const git_signature,
+        message_encoding: *const c_char,
+        message: *const c_char,
+        tree: *const git_tree,
+        parent_count: size_t,
+        parents: *mut *const git_commit,
+    ) -> c_int;
+    pub fn git_commit_header_field(
+        out: *mut git_buf,
+        commit: *const git_commit,
+        field: *const c_char,
+    ) -> c_int;
+    pub fn git_annotated_commit_lookup(
+        out: *mut *mut git_annotated_commit,
+        repo: *mut git_repository,
+        id: *const git_oid,
+    ) -> c_int;
+    pub fn git_commit_create_with_signature(
+        id: *mut git_oid,
+        repo: *mut git_repository,
+        commit_content: *const c_char,
+        signature: *const c_char,
+        signature_field: *const c_char,
+    ) -> c_int;
+    pub fn git_commit_extract_signature(
+        signature: *mut git_buf,
+        signed_data: *mut git_buf,
+        repo: *mut git_repository,
+        commit_id: *mut git_oid,
+        field: *const c_char,
+    ) -> c_int;
+
+    // branch
+    pub fn git_branch_create(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        branch_name: *const c_char,
+        target: *const git_commit,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_branch_create_from_annotated(
+        ref_out: *mut *mut git_reference,
+        repository: *mut git_repository,
+        branch_name: *const c_char,
+        commit: *const git_annotated_commit,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_branch_delete(branch: *mut git_reference) -> c_int;
+    pub fn git_branch_is_head(branch: *const git_reference) -> c_int;
+    pub fn git_branch_iterator_free(iter: *mut git_branch_iterator);
+    pub fn git_branch_iterator_new(
+        iter: *mut *mut git_branch_iterator,
+        repo: *mut git_repository,
+        list_flags: git_branch_t,
+    ) -> c_int;
+    pub fn git_branch_lookup(
+        out: *mut *mut git_reference,
+        repo: *mut git_repository,
+        branch_name: *const c_char,
+        branch_type: git_branch_t,
+    ) -> c_int;
+    pub fn git_branch_move(
+        out: *mut *mut git_reference,
+        branch: *mut git_reference,
+        new_branch_name: *const c_char,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_branch_name(out: *mut *const c_char, branch: *const git_reference) -> c_int;
+    pub fn git_branch_name_is_valid(valid: *mut c_int, name: *const c_char) -> c_int;
+    pub fn git_branch_remote_name(
+        out: *mut git_buf,
+        repo: *mut git_repository,
+        refname: *const c_char,
+    ) -> c_int;
+    pub fn git_branch_next(
+        out: *mut *mut git_reference,
+        out_type: *mut git_branch_t,
+        iter: *mut git_branch_iterator,
+    ) -> c_int;
+    pub fn git_branch_set_upstream(
+        branch: *mut git_reference,
+        upstream_name: *const c_char,
+    ) -> c_int;
+    pub fn git_branch_upstream(out: *mut *mut git_reference, branch: *const git_reference)
+        -> c_int;
+    pub fn git_branch_upstream_name(
+        out: *mut git_buf,
+        repo: *mut git_repository,
+        refname: *const c_char,
+    ) -> c_int;
+    pub fn git_branch_upstream_remote(
+        out: *mut git_buf,
+        repo: *mut git_repository,
+        refname: *const c_char,
+    ) -> c_int;
+
+    // index
+    pub fn git_index_version(index: *mut git_index) -> c_uint;
+    pub fn git_index_set_version(index: *mut git_index, version: c_uint) -> c_int;
+    pub fn git_index_add(index: *mut git_index, entry: *const git_index_entry) -> c_int;
+    pub fn git_index_add_all(
+        index: *mut git_index,
+        pathspec: *const git_strarray,
+        flags: c_uint,
+        callback: git_index_matched_path_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_index_add_bypath(index: *mut git_index, path: *const c_char) -> c_int;
+    pub fn git_index_add_frombuffer(
+        index: *mut git_index,
+        entry: *const git_index_entry,
+        buffer: *const c_void,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_index_conflict_add(
+        index: *mut git_index,
+        ancestor_entry: *const git_index_entry,
+        our_entry: *const git_index_entry,
+        their_entry: *const git_index_entry,
+    ) -> c_int;
+    pub fn git_index_conflict_remove(index: *mut git_index, path: *const c_char) -> c_int;
+    pub fn git_index_conflict_get(
+        ancestor_out: *mut *const git_index_entry,
+        our_out: *mut *const git_index_entry,
+        their_out: *mut *const git_index_entry,
+        index: *mut git_index,
+        path: *const c_char,
+    ) -> c_int;
+    pub fn git_index_conflict_iterator_new(
+        iter: *mut *mut git_index_conflict_iterator,
+        index: *mut git_index,
+    ) -> c_int;
+    pub fn git_index_conflict_next(
+        ancestor_out: *mut *const git_index_entry,
+        our_out: *mut *const git_index_entry,
+        their_out: *mut *const git_index_entry,
+        iter: *mut git_index_conflict_iterator,
+    ) -> c_int;
+    pub fn git_index_conflict_iterator_free(iter: *mut git_index_conflict_iterator);
+    pub fn git_index_clear(index: *mut git_index) -> c_int;
+    pub fn git_index_entry_stage(entry: *const git_index_entry) -> c_int;
+    pub fn git_index_entrycount(entry: *const git_index) -> size_t;
+    pub fn git_index_find(at_pos: *mut size_t, index: *mut git_index, path: *const c_char)
+        -> c_int;
+    pub fn git_index_find_prefix(
+        at_pos: *mut size_t,
+        index: *mut git_index,
+        prefix: *const c_char,
+    ) -> c_int;
+    pub fn git_index_free(index: *mut git_index);
+    pub fn git_index_get_byindex(index: *mut git_index, n: size_t) -> *const git_index_entry;
+    pub fn git_index_get_bypath(
+        index: *mut git_index,
+        path: *const c_char,
+        stage: c_int,
+    ) -> *const git_index_entry;
+    pub fn git_index_has_conflicts(index: *const git_index) -> c_int;
+    pub fn git_index_new(index: *mut *mut git_index) -> c_int;
+    pub fn git_index_open(index: *mut *mut git_index, index_path: *const c_char) -> c_int;
+    pub fn git_index_path(index: *const git_index) -> *const c_char;
+    pub fn git_index_read(index: *mut git_index, force: c_int) -> c_int;
+    pub fn git_index_read_tree(index: *mut git_index, tree: *const git_tree) -> c_int;
+    pub fn git_index_remove(index: *mut git_index, path: *const c_char, stage: c_int) -> c_int;
+    pub fn git_index_remove_all(
+        index: *mut git_index,
+        pathspec: *const git_strarray,
+        callback: git_index_matched_path_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_index_remove_bypath(index: *mut git_index, path: *const c_char) -> c_int;
+    pub fn git_index_remove_directory(
+        index: *mut git_index,
+        dir: *const c_char,
+        stage: c_int,
+    ) -> c_int;
+    pub fn git_index_update_all(
+        index: *mut git_index,
+        pathspec: *const git_strarray,
+        callback: git_index_matched_path_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_index_write(index: *mut git_index) -> c_int;
+    pub fn git_index_write_tree(out: *mut git_oid, index: *mut git_index) -> c_int;
+    pub fn git_index_write_tree_to(
+        out: *mut git_oid,
+        index: *mut git_index,
+        repo: *mut git_repository,
+    ) -> c_int;
+
+    // config
+    pub fn git_config_add_file_ondisk(
+        cfg: *mut git_config,
+        path: *const c_char,
+        level: git_config_level_t,
+        repo: *const git_repository,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_config_delete_entry(cfg: *mut git_config, name: *const c_char) -> c_int;
+    pub fn git_config_delete_multivar(
+        cfg: *mut git_config,
+        name: *const c_char,
+        regexp: *const c_char,
+    ) -> c_int;
+    pub fn git_config_find_programdata(out: *mut git_buf) -> c_int;
+    pub fn git_config_find_global(out: *mut git_buf) -> c_int;
+    pub fn git_config_find_system(out: *mut git_buf) -> c_int;
+    pub fn git_config_find_xdg(out: *mut git_buf) -> c_int;
+    pub fn git_config_free(cfg: *mut git_config);
+    pub fn git_config_get_bool(
+        out: *mut c_int,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_entry(
+        out: *mut *mut git_config_entry,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_int32(
+        out: *mut i32,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_int64(
+        out: *mut i64,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_string(
+        out: *mut *const c_char,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_string_buf(
+        out: *mut git_buf,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_get_path(
+        out: *mut git_buf,
+        cfg: *const git_config,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_config_iterator_free(iter: *mut git_config_iterator);
+    pub fn git_config_iterator_glob_new(
+        out: *mut *mut git_config_iterator,
+        cfg: *const git_config,
+        regexp: *const c_char,
+    ) -> c_int;
+    pub fn git_config_iterator_new(
+        out: *mut *mut git_config_iterator,
+        cfg: *const git_config,
+    ) -> c_int;
+    pub fn git_config_new(out: *mut *mut git_config) -> c_int;
+    pub fn git_config_next(
+        entry: *mut *mut git_config_entry,
+        iter: *mut git_config_iterator,
+    ) -> c_int;
+    pub fn git_config_open_default(out: *mut *mut git_config) -> c_int;
+    pub fn git_config_open_global(out: *mut *mut git_config, config: *mut git_config) -> c_int;
+    pub fn git_config_open_level(
+        out: *mut *mut git_config,
+        parent: *const git_config,
+        level: git_config_level_t,
+    ) -> c_int;
+    pub fn git_config_open_ondisk(out: *mut *mut git_config, path: *const c_char) -> c_int;
+    pub fn git_config_parse_bool(out: *mut c_int, value: *const c_char) -> c_int;
+    pub fn git_config_parse_int32(out: *mut i32, value: *const c_char) -> c_int;
+    pub fn git_config_parse_int64(out: *mut i64, value: *const c_char) -> c_int;
+    pub fn git_config_set_bool(cfg: *mut git_config, name: *const c_char, value: c_int) -> c_int;
+    pub fn git_config_set_int32(cfg: *mut git_config, name: *const c_char, value: i32) -> c_int;
+    pub fn git_config_set_int64(cfg: *mut git_config, name: *const c_char, value: i64) -> c_int;
+    pub fn git_config_set_multivar(
+        cfg: *mut git_config,
+        name: *const c_char,
+        regexp: *const c_char,
+        value: *const c_char,
+    ) -> c_int;
+    pub fn git_config_set_string(
+        cfg: *mut git_config,
+        name: *const c_char,
+        value: *const c_char,
+    ) -> c_int;
+    pub fn git_config_snapshot(out: *mut *mut git_config, config: *mut git_config) -> c_int;
+    pub fn git_config_entry_free(entry: *mut git_config_entry);
+    pub fn git_config_multivar_iterator_new(
+        out: *mut *mut git_config_iterator,
+        cfg: *const git_config,
+        name: *const c_char,
+        regexp: *const c_char,
+    ) -> c_int;
+
+    // attr
+    pub fn git_attr_get(
+        value_out: *mut *const c_char,
+        repo: *mut git_repository,
+        flags: u32,
+        path: *const c_char,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_attr_value(value: *const c_char) -> git_attr_value_t;
+
+    // cred
+    pub fn git_cred_default_new(out: *mut *mut git_cred) -> c_int;
+    pub fn git_cred_has_username(cred: *mut git_cred) -> c_int;
+    pub fn git_cred_ssh_custom_new(
+        out: *mut *mut git_cred,
+        username: *const c_char,
+        publickey: *const c_char,
+        publickey_len: size_t,
+        sign_callback: git_cred_sign_callback,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_cred_ssh_interactive_new(
+        out: *mut *mut git_cred,
+        username: *const c_char,
+        prompt_callback: git_cred_ssh_interactive_callback,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_cred_ssh_key_from_agent(out: *mut *mut git_cred, username: *const c_char) -> c_int;
+    pub fn git_cred_ssh_key_new(
+        out: *mut *mut git_cred,
+        username: *const c_char,
+        publickey: *const c_char,
+        privatekey: *const c_char,
+        passphrase: *const c_char,
+    ) -> c_int;
+    pub fn git_cred_ssh_key_memory_new(
+        out: *mut *mut git_cred,
+        username: *const c_char,
+        publickey: *const c_char,
+        privatekey: *const c_char,
+        passphrase: *const c_char,
+    ) -> c_int;
+    pub fn git_cred_userpass(
+        cred: *mut *mut git_cred,
+        url: *const c_char,
+        user_from_url: *const c_char,
+        allowed_types: c_uint,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_cred_userpass_plaintext_new(
+        out: *mut *mut git_cred,
+        username: *const c_char,
+        password: *const c_char,
+    ) -> c_int;
+    pub fn git_cred_username_new(cred: *mut *mut git_cred, username: *const c_char) -> c_int;
+
+    // tags
+    pub fn git_tag_annotation_create(
+        oid: *mut git_oid,
+        repo: *mut git_repository,
+        tag_name: *const c_char,
+        target: *const git_object,
+        tagger: *const git_signature,
+        message: *const c_char,
+    ) -> c_int;
+    pub fn git_tag_create(
+        oid: *mut git_oid,
+        repo: *mut git_repository,
+        tag_name: *const c_char,
+        target: *const git_object,
+        tagger: *const git_signature,
+        message: *const c_char,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_tag_create_frombuffer(
+        oid: *mut git_oid,
+        repo: *mut git_repository,
+        buffer: *const c_char,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_tag_create_lightweight(
+        oid: *mut git_oid,
+        repo: *mut git_repository,
+        tag_name: *const c_char,
+        target: *const git_object,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_tag_delete(repo: *mut git_repository, tag_name: *const c_char) -> c_int;
+    pub fn git_tag_foreach(
+        repo: *mut git_repository,
+        callback: git_tag_foreach_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_tag_free(tag: *mut git_tag);
+    pub fn git_tag_id(tag: *const git_tag) -> *const git_oid;
+    pub fn git_tag_list(tag_names: *mut git_strarray, repo: *mut git_repository) -> c_int;
+    pub fn git_tag_list_match(
+        tag_names: *mut git_strarray,
+        pattern: *const c_char,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_tag_lookup(
+        out: *mut *mut git_tag,
+        repo: *mut git_repository,
+        id: *const git_oid,
+    ) -> c_int;
+    pub fn git_tag_lookup_prefix(
+        out: *mut *mut git_tag,
+        repo: *mut git_repository,
+        id: *const git_oid,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_tag_message(tag: *const git_tag) -> *const c_char;
+    pub fn git_tag_name(tag: *const git_tag) -> *const c_char;
+    pub fn git_tag_peel(tag_target_out: *mut *mut git_object, tag: *const git_tag) -> c_int;
+    pub fn git_tag_tagger(tag: *const git_tag) -> *const git_signature;
+    pub fn git_tag_target(target_out: *mut *mut git_object, tag: *const git_tag) -> c_int;
+    pub fn git_tag_target_id(tag: *const git_tag) -> *const git_oid;
+    pub fn git_tag_target_type(tag: *const git_tag) -> git_object_t;
+    pub fn git_tag_name_is_valid(valid: *mut c_int, tag_name: *const c_char) -> c_int;
+
+    // checkout
+    pub fn git_checkout_head(repo: *mut git_repository, opts: *const git_checkout_options)
+        -> c_int;
+    pub fn git_checkout_index(
+        repo: *mut git_repository,
+        index: *mut git_index,
+        opts: *const git_checkout_options,
+    ) -> c_int;
+    pub fn git_checkout_tree(
+        repo: *mut git_repository,
+        treeish: *const git_object,
+        opts: *const git_checkout_options,
+    ) -> c_int;
+    pub fn git_checkout_init_options(opts: *mut git_checkout_options, version: c_uint) -> c_int;
+
+    // merge
+    pub fn git_annotated_commit_id(commit: *const git_annotated_commit) -> *const git_oid;
+    pub fn git_annotated_commit_ref(commit: *const git_annotated_commit) -> *const c_char;
+    pub fn git_annotated_commit_from_ref(
+        out: *mut *mut git_annotated_commit,
+        repo: *mut git_repository,
+        reference: *const git_reference,
+    ) -> c_int;
+    pub fn git_annotated_commit_from_fetchhead(
+        out: *mut *mut git_annotated_commit,
+        repo: *mut git_repository,
+        branch_name: *const c_char,
+        remote_url: *const c_char,
+        oid: *const git_oid,
+    ) -> c_int;
+    pub fn git_annotated_commit_free(commit: *mut git_annotated_commit);
+    pub fn git_merge_init_options(opts: *mut git_merge_options, version: c_uint) -> c_int;
+    pub fn git_merge(
+        repo: *mut git_repository,
+        their_heads: *mut *const git_annotated_commit,
+        len: size_t,
+        merge_opts: *const git_merge_options,
+        checkout_opts: *const git_checkout_options,
+    ) -> c_int;
+    pub fn git_merge_commits(
+        out: *mut *mut git_index,
+        repo: *mut git_repository,
+        our_commit: *const git_commit,
+        their_commit: *const git_commit,
+        opts: *const git_merge_options,
+    ) -> c_int;
+    pub fn git_merge_trees(
+        out: *mut *mut git_index,
+        repo: *mut git_repository,
+        ancestor_tree: *const git_tree,
+        our_tree: *const git_tree,
+        their_tree: *const git_tree,
+        opts: *const git_merge_options,
+    ) -> c_int;
+    pub fn git_repository_state_cleanup(repo: *mut git_repository) -> c_int;
+
+    // merge analysis
+
+    pub fn git_merge_analysis(
+        analysis_out: *mut git_merge_analysis_t,
+        pref_out: *mut git_merge_preference_t,
+        repo: *mut git_repository,
+        their_heads: *mut *const git_annotated_commit,
+        their_heads_len: usize,
+    ) -> c_int;
+
+    pub fn git_merge_analysis_for_ref(
+        analysis_out: *mut git_merge_analysis_t,
+        pref_out: *mut git_merge_preference_t,
+        repo: *mut git_repository,
+        git_reference: *mut git_reference,
+        their_heads: *mut *const git_annotated_commit,
+        their_heads_len: usize,
+    ) -> c_int;
+
+    // notes
+    pub fn git_note_author(note: *const git_note) -> *const git_signature;
+    pub fn git_note_committer(note: *const git_note) -> *const git_signature;
+    pub fn git_note_create(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        notes_ref: *const c_char,
+        author: *const git_signature,
+        committer: *const git_signature,
+        oid: *const git_oid,
+        note: *const c_char,
+        force: c_int,
+    ) -> c_int;
+    pub fn git_note_default_ref(out: *mut git_buf, repo: *mut git_repository) -> c_int;
+    pub fn git_note_free(note: *mut git_note);
+    pub fn git_note_id(note: *const git_note) -> *const git_oid;
+    pub fn git_note_iterator_free(it: *mut git_note_iterator);
+    pub fn git_note_iterator_new(
+        out: *mut *mut git_note_iterator,
+        repo: *mut git_repository,
+        notes_ref: *const c_char,
+    ) -> c_int;
+    pub fn git_note_message(note: *const git_note) -> *const c_char;
+    pub fn git_note_next(
+        note_id: *mut git_oid,
+        annotated_id: *mut git_oid,
+        it: *mut git_note_iterator,
+    ) -> c_int;
+    pub fn git_note_read(
+        out: *mut *mut git_note,
+        repo: *mut git_repository,
+        notes_ref: *const c_char,
+        oid: *const git_oid,
+    ) -> c_int;
+    pub fn git_note_remove(
+        repo: *mut git_repository,
+        notes_ref: *const c_char,
+        author: *const git_signature,
+        committer: *const git_signature,
+        oid: *const git_oid,
+    ) -> c_int;
+
+    // blame
+    pub fn git_blame_file(
+        out: *mut *mut git_blame,
+        repo: *mut git_repository,
+        path: *const c_char,
+        options: *mut git_blame_options,
+    ) -> c_int;
+    pub fn git_blame_free(blame: *mut git_blame);
+
+    pub fn git_blame_init_options(opts: *mut git_blame_options, version: c_uint) -> c_int;
+    pub fn git_blame_get_hunk_count(blame: *mut git_blame) -> u32;
+
+    pub fn git_blame_get_hunk_byline(blame: *mut git_blame, lineno: usize)
+        -> *const git_blame_hunk;
+    pub fn git_blame_get_hunk_byindex(blame: *mut git_blame, index: u32) -> *const git_blame_hunk;
+
+    // revwalk
+    pub fn git_revwalk_new(out: *mut *mut git_revwalk, repo: *mut git_repository) -> c_int;
+    pub fn git_revwalk_free(walk: *mut git_revwalk);
+
+    pub fn git_revwalk_reset(walk: *mut git_revwalk) -> c_int;
+
+    pub fn git_revwalk_sorting(walk: *mut git_revwalk, sort_mode: c_uint) -> c_int;
+
+    pub fn git_revwalk_push_head(walk: *mut git_revwalk) -> c_int;
+    pub fn git_revwalk_push(walk: *mut git_revwalk, oid: *const git_oid) -> c_int;
+    pub fn git_revwalk_push_ref(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
+    pub fn git_revwalk_push_glob(walk: *mut git_revwalk, glob: *const c_char) -> c_int;
+    pub fn git_revwalk_push_range(walk: *mut git_revwalk, range: *const c_char) -> c_int;
+    pub fn git_revwalk_simplify_first_parent(walk: *mut git_revwalk) -> c_int;
+
+    pub fn git_revwalk_hide_head(walk: *mut git_revwalk) -> c_int;
+    pub fn git_revwalk_hide(walk: *mut git_revwalk, oid: *const git_oid) -> c_int;
+    pub fn git_revwalk_hide_ref(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
+    pub fn git_revwalk_hide_glob(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
+    pub fn git_revwalk_add_hide_cb(
+        walk: *mut git_revwalk,
+        hide_cb: git_revwalk_hide_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+
+    pub fn git_revwalk_next(out: *mut git_oid, walk: *mut git_revwalk) -> c_int;
+
+    // merge
+    pub fn git_merge_base(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        one: *const git_oid,
+        two: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_merge_base_many(
+        out: *mut git_oid,
+        repo: *mut git_repository,
+        length: size_t,
+        input_array: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_merge_bases(
+        out: *mut git_oidarray,
+        repo: *mut git_repository,
+        one: *const git_oid,
+        two: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_merge_bases_many(
+        out: *mut git_oidarray,
+        repo: *mut git_repository,
+        length: size_t,
+        input_array: *const git_oid,
+    ) -> c_int;
+
+    // pathspec
+    pub fn git_pathspec_free(ps: *mut git_pathspec);
+    pub fn git_pathspec_match_diff(
+        out: *mut *mut git_pathspec_match_list,
+        diff: *mut git_diff,
+        flags: u32,
+        ps: *mut git_pathspec,
+    ) -> c_int;
+    pub fn git_pathspec_match_index(
+        out: *mut *mut git_pathspec_match_list,
+        index: *mut git_index,
+        flags: u32,
+        ps: *mut git_pathspec,
+    ) -> c_int;
+    pub fn git_pathspec_match_list_diff_entry(
+        m: *const git_pathspec_match_list,
+        pos: size_t,
+    ) -> *const git_diff_delta;
+    pub fn git_pathspec_match_list_entry(
+        m: *const git_pathspec_match_list,
+        pos: size_t,
+    ) -> *const c_char;
+    pub fn git_pathspec_match_list_entrycount(m: *const git_pathspec_match_list) -> size_t;
+    pub fn git_pathspec_match_list_failed_entry(
+        m: *const git_pathspec_match_list,
+        pos: size_t,
+    ) -> *const c_char;
+    pub fn git_pathspec_match_list_failed_entrycount(m: *const git_pathspec_match_list) -> size_t;
+    pub fn git_pathspec_match_list_free(m: *mut git_pathspec_match_list);
+    pub fn git_pathspec_match_tree(
+        out: *mut *mut git_pathspec_match_list,
+        tree: *mut git_tree,
+        flags: u32,
+        ps: *mut git_pathspec,
+    ) -> c_int;
+    pub fn git_pathspec_match_workdir(
+        out: *mut *mut git_pathspec_match_list,
+        repo: *mut git_repository,
+        flags: u32,
+        ps: *mut git_pathspec,
+    ) -> c_int;
+    pub fn git_pathspec_matches_path(
+        ps: *const git_pathspec,
+        flags: u32,
+        path: *const c_char,
+    ) -> c_int;
+    pub fn git_pathspec_new(out: *mut *mut git_pathspec, pathspec: *const git_strarray) -> c_int;
+
+    // diff
+    pub fn git_diff_blob_to_buffer(
+        old_blob: *const git_blob,
+        old_as_path: *const c_char,
+        buffer: *const c_char,
+        buffer_len: size_t,
+        buffer_as_path: *const c_char,
+        options: *const git_diff_options,
+        file_cb: git_diff_file_cb,
+        binary_cb: git_diff_binary_cb,
+        hunk_cb: git_diff_hunk_cb,
+        line_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_diff_blobs(
+        old_blob: *const git_blob,
+        old_as_path: *const c_char,
+        new_blob: *const git_blob,
+        new_as_path: *const c_char,
+        options: *const git_diff_options,
+        file_cb: git_diff_file_cb,
+        binary_cb: git_diff_binary_cb,
+        hunk_cb: git_diff_hunk_cb,
+        line_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_diff_buffers(
+        old_buffer: *const c_void,
+        old_len: size_t,
+        old_as_path: *const c_char,
+        new_buffer: *const c_void,
+        new_len: size_t,
+        new_as_path: *const c_char,
+        options: *const git_diff_options,
+        file_cb: git_diff_file_cb,
+        binary_cb: git_diff_binary_cb,
+        hunk_cb: git_diff_hunk_cb,
+        line_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_diff_from_buffer(
+        diff: *mut *mut git_diff,
+        content: *const c_char,
+        content_len: size_t,
+    ) -> c_int;
+    pub fn git_diff_find_similar(
+        diff: *mut git_diff,
+        options: *const git_diff_find_options,
+    ) -> c_int;
+    pub fn git_diff_find_init_options(opts: *mut git_diff_find_options, version: c_uint) -> c_int;
+    pub fn git_diff_foreach(
+        diff: *mut git_diff,
+        file_cb: git_diff_file_cb,
+        binary_cb: git_diff_binary_cb,
+        hunk_cb: git_diff_hunk_cb,
+        line_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_diff_free(diff: *mut git_diff);
+    pub fn git_diff_get_delta(diff: *const git_diff, idx: size_t) -> *const git_diff_delta;
+    pub fn git_diff_get_stats(out: *mut *mut git_diff_stats, diff: *mut git_diff) -> c_int;
+    pub fn git_diff_index_to_index(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        old_index: *mut git_index,
+        new_index: *mut git_index,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_diff_index_to_workdir(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        index: *mut git_index,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_diff_init_options(opts: *mut git_diff_options, version: c_uint) -> c_int;
+    pub fn git_diff_is_sorted_icase(diff: *const git_diff) -> c_int;
+    pub fn git_diff_merge(onto: *mut git_diff, from: *const git_diff) -> c_int;
+    pub fn git_diff_num_deltas(diff: *const git_diff) -> size_t;
+    pub fn git_diff_num_deltas_of_type(diff: *const git_diff, delta: git_delta_t) -> size_t;
+    pub fn git_diff_print(
+        diff: *mut git_diff,
+        format: git_diff_format_t,
+        print_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_diff_stats_deletions(stats: *const git_diff_stats) -> size_t;
+    pub fn git_diff_stats_files_changed(stats: *const git_diff_stats) -> size_t;
+    pub fn git_diff_stats_free(stats: *mut git_diff_stats);
+    pub fn git_diff_stats_insertions(stats: *const git_diff_stats) -> size_t;
+    pub fn git_diff_stats_to_buf(
+        out: *mut git_buf,
+        stats: *const git_diff_stats,
+        format: git_diff_stats_format_t,
+        width: size_t,
+    ) -> c_int;
+    pub fn git_diff_status_char(status: git_delta_t) -> c_char;
+    pub fn git_diff_tree_to_index(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        old_tree: *mut git_tree,
+        index: *mut git_index,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_diff_tree_to_tree(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        old_tree: *mut git_tree,
+        new_tree: *mut git_tree,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_diff_tree_to_workdir(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        old_tree: *mut git_tree,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_diff_tree_to_workdir_with_index(
+        diff: *mut *mut git_diff,
+        repo: *mut git_repository,
+        old_tree: *mut git_tree,
+        opts: *const git_diff_options,
+    ) -> c_int;
+
+    pub fn git_graph_ahead_behind(
+        ahead: *mut size_t,
+        behind: *mut size_t,
+        repo: *mut git_repository,
+        local: *const git_oid,
+        upstream: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_graph_descendant_of(
+        repo: *mut git_repository,
+        commit: *const git_oid,
+        ancestor: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_diff_format_email(
+        out: *mut git_buf,
+        diff: *mut git_diff,
+        opts: *const git_diff_format_email_options,
+    ) -> c_int;
+    pub fn git_diff_format_email_options_init(
+        opts: *mut git_diff_format_email_options,
+        version: c_uint,
+    ) -> c_int;
+
+    pub fn git_diff_patchid(
+        out: *mut git_oid,
+        diff: *mut git_diff,
+        opts: *mut git_diff_patchid_options,
+    ) -> c_int;
+    pub fn git_diff_patchid_options_init(
+        opts: *mut git_diff_patchid_options,
+        version: c_uint,
+    ) -> c_int;
+
+    // patch
+    pub fn git_patch_from_diff(out: *mut *mut git_patch, diff: *mut git_diff, idx: size_t)
+        -> c_int;
+    pub fn git_patch_from_blobs(
+        out: *mut *mut git_patch,
+        old_blob: *const git_blob,
+        old_as_path: *const c_char,
+        new_blob: *const git_blob,
+        new_as_path: *const c_char,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_patch_from_blob_and_buffer(
+        out: *mut *mut git_patch,
+        old_blob: *const git_blob,
+        old_as_path: *const c_char,
+        buffer: *const c_void,
+        buffer_len: size_t,
+        buffer_as_path: *const c_char,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_patch_from_buffers(
+        out: *mut *mut git_patch,
+        old_buffer: *const c_void,
+        old_len: size_t,
+        old_as_path: *const c_char,
+        new_buffer: *const c_void,
+        new_len: size_t,
+        new_as_path: *const c_char,
+        opts: *const git_diff_options,
+    ) -> c_int;
+    pub fn git_patch_free(patch: *mut git_patch);
+    pub fn git_patch_get_delta(patch: *const git_patch) -> *const git_diff_delta;
+    pub fn git_patch_num_hunks(patch: *const git_patch) -> size_t;
+    pub fn git_patch_line_stats(
+        total_context: *mut size_t,
+        total_additions: *mut size_t,
+        total_deletions: *mut size_t,
+        patch: *const git_patch,
+    ) -> c_int;
+    pub fn git_patch_get_hunk(
+        out: *mut *const git_diff_hunk,
+        lines_in_hunk: *mut size_t,
+        patch: *mut git_patch,
+        hunk_idx: size_t,
+    ) -> c_int;
+    pub fn git_patch_num_lines_in_hunk(patch: *const git_patch, hunk_idx: size_t) -> c_int;
+    pub fn git_patch_get_line_in_hunk(
+        out: *mut *const git_diff_line,
+        patch: *mut git_patch,
+        hunk_idx: size_t,
+        line_of_hunk: size_t,
+    ) -> c_int;
+    pub fn git_patch_size(
+        patch: *mut git_patch,
+        include_context: c_int,
+        include_hunk_headers: c_int,
+        include_file_headers: c_int,
+    ) -> size_t;
+    pub fn git_patch_print(
+        patch: *mut git_patch,
+        print_cb: git_diff_line_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_patch_to_buf(buf: *mut git_buf, patch: *mut git_patch) -> c_int;
+
+    // reflog
+    pub fn git_reflog_append(
+        reflog: *mut git_reflog,
+        id: *const git_oid,
+        committer: *const git_signature,
+        msg: *const c_char,
+    ) -> c_int;
+    pub fn git_reflog_delete(repo: *mut git_repository, name: *const c_char) -> c_int;
+    pub fn git_reflog_drop(
+        reflog: *mut git_reflog,
+        idx: size_t,
+        rewrite_previous_entry: c_int,
+    ) -> c_int;
+    pub fn git_reflog_entry_byindex(
+        reflog: *const git_reflog,
+        idx: size_t,
+    ) -> *const git_reflog_entry;
+    pub fn git_reflog_entry_committer(entry: *const git_reflog_entry) -> *const git_signature;
+    pub fn git_reflog_entry_id_new(entry: *const git_reflog_entry) -> *const git_oid;
+    pub fn git_reflog_entry_id_old(entry: *const git_reflog_entry) -> *const git_oid;
+    pub fn git_reflog_entry_message(entry: *const git_reflog_entry) -> *const c_char;
+    pub fn git_reflog_entrycount(reflog: *mut git_reflog) -> size_t;
+    pub fn git_reflog_free(reflog: *mut git_reflog);
+    pub fn git_reflog_read(
+        out: *mut *mut git_reflog,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_reflog_rename(
+        repo: *mut git_repository,
+        old_name: *const c_char,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_reflog_write(reflog: *mut git_reflog) -> c_int;
+
+    // transport
+    pub fn git_transport_register(
+        prefix: *const c_char,
+        cb: git_transport_cb,
+        param: *mut c_void,
+    ) -> c_int;
+    pub fn git_transport_unregister(prefix: *const c_char) -> c_int;
+    pub fn git_transport_smart(
+        out: *mut *mut git_transport,
+        owner: *mut git_remote,
+        payload: *mut c_void,
+    ) -> c_int;
+
+    // describe
+    pub fn git_describe_commit(
+        result: *mut *mut git_describe_result,
+        object: *mut git_object,
+        opts: *mut git_describe_options,
+    ) -> c_int;
+    pub fn git_describe_format(
+        buf: *mut git_buf,
+        result: *const git_describe_result,
+        opts: *const git_describe_format_options,
+    ) -> c_int;
+    pub fn git_describe_result_free(result: *mut git_describe_result);
+    pub fn git_describe_workdir(
+        out: *mut *mut git_describe_result,
+        repo: *mut git_repository,
+        opts: *mut git_describe_options,
+    ) -> c_int;
+
+    // message
+    pub fn git_message_prettify(
+        out: *mut git_buf,
+        message: *const c_char,
+        strip_comments: c_int,
+        comment_char: c_char,
+    ) -> c_int;
+
+    pub fn git_message_trailers(
+        out: *mut git_message_trailer_array,
+        message: *const c_char,
+    ) -> c_int;
+
+    pub fn git_message_trailer_array_free(trailer: *mut git_message_trailer_array);
+
+    // packbuilder
+    pub fn git_packbuilder_new(out: *mut *mut git_packbuilder, repo: *mut git_repository) -> c_int;
+    pub fn git_packbuilder_set_threads(pb: *mut git_packbuilder, n: c_uint) -> c_uint;
+    pub fn git_packbuilder_insert(
+        pb: *mut git_packbuilder,
+        id: *const git_oid,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_packbuilder_insert_tree(pb: *mut git_packbuilder, id: *const git_oid) -> c_int;
+    pub fn git_packbuilder_insert_commit(pb: *mut git_packbuilder, id: *const git_oid) -> c_int;
+    pub fn git_packbuilder_insert_walk(pb: *mut git_packbuilder, walk: *mut git_revwalk) -> c_int;
+    pub fn git_packbuilder_insert_recur(
+        pb: *mut git_packbuilder,
+        id: *const git_oid,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_packbuilder_write_buf(buf: *mut git_buf, pb: *mut git_packbuilder) -> c_int;
+    pub fn git_packbuilder_write(
+        pb: *mut git_packbuilder,
+        path: *const c_char,
+        mode: c_uint,
+        progress_cb: git_indexer_progress_cb,
+        progress_cb_payload: *mut c_void,
+    ) -> c_int;
+    #[deprecated = "use `git_packbuilder_name` to retrieve the filename"]
+    pub fn git_packbuilder_hash(pb: *mut git_packbuilder) -> *const git_oid;
+    pub fn git_packbuilder_name(pb: *mut git_packbuilder) -> *const c_char;
+    pub fn git_packbuilder_foreach(
+        pb: *mut git_packbuilder,
+        cb: git_packbuilder_foreach_cb,
+        payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_packbuilder_object_count(pb: *mut git_packbuilder) -> size_t;
+    pub fn git_packbuilder_written(pb: *mut git_packbuilder) -> size_t;
+    pub fn git_packbuilder_set_callbacks(
+        pb: *mut git_packbuilder,
+        progress_cb: git_packbuilder_progress,
+        progress_cb_payload: *mut c_void,
+    ) -> c_int;
+    pub fn git_packbuilder_free(pb: *mut git_packbuilder);
+
+    // indexer
+    pub fn git_indexer_new(
+        out: *mut *mut git_indexer,
+        path: *const c_char,
+        mode: c_uint,
+        odb: *mut git_odb,
+        opts: *mut git_indexer_options,
+    ) -> c_int;
+    pub fn git_indexer_append(
+        idx: *mut git_indexer,
+        data: *const c_void,
+        size: size_t,
+        stats: *mut git_indexer_progress,
+    ) -> c_int;
+    pub fn git_indexer_commit(idx: *mut git_indexer, stats: *mut git_indexer_progress) -> c_int;
+    #[deprecated = "use `git_indexer_name` to retrieve the filename"]
+    pub fn git_indexer_hash(idx: *const git_indexer) -> *const git_oid;
+    pub fn git_indexer_name(idx: *const git_indexer) -> *const c_char;
+    pub fn git_indexer_free(idx: *mut git_indexer);
+
+    pub fn git_indexer_options_init(opts: *mut git_indexer_options, version: c_uint) -> c_int;
+
+    // odb
+    pub fn git_repository_odb(out: *mut *mut git_odb, repo: *mut git_repository) -> c_int;
+    pub fn git_odb_new(db: *mut *mut git_odb) -> c_int;
+    pub fn git_odb_free(db: *mut git_odb);
+    pub fn git_odb_open_rstream(
+        out: *mut *mut git_odb_stream,
+        len: *mut size_t,
+        otype: *mut git_object_t,
+        db: *mut git_odb,
+        oid: *const git_oid,
+    ) -> c_int;
+    pub fn git_odb_stream_read(
+        stream: *mut git_odb_stream,
+        buffer: *mut c_char,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_odb_open_wstream(
+        out: *mut *mut git_odb_stream,
+        db: *mut git_odb,
+        size: git_object_size_t,
+        obj_type: git_object_t,
+    ) -> c_int;
+    pub fn git_odb_stream_write(
+        stream: *mut git_odb_stream,
+        buffer: *const c_char,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_odb_stream_finalize_write(id: *mut git_oid, stream: *mut git_odb_stream) -> c_int;
+    pub fn git_odb_stream_free(stream: *mut git_odb_stream);
+    pub fn git_odb_foreach(db: *mut git_odb, cb: git_odb_foreach_cb, payload: *mut c_void)
+        -> c_int;
+
+    pub fn git_odb_read(
+        out: *mut *mut git_odb_object,
+        odb: *mut git_odb,
+        oid: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_odb_read_header(
+        len_out: *mut size_t,
+        type_out: *mut git_object_t,
+        odb: *mut git_odb,
+        oid: *const git_oid,
+    ) -> c_int;
+
+    pub fn git_odb_write(
+        out: *mut git_oid,
+        odb: *mut git_odb,
+        data: *const c_void,
+        len: size_t,
+        otype: git_object_t,
+    ) -> c_int;
+
+    pub fn git_odb_write_pack(
+        out: *mut *mut git_odb_writepack,
+        odb: *mut git_odb,
+        progress_cb: git_indexer_progress_cb,
+        progress_payload: *mut c_void,
+    ) -> c_int;
+
+    pub fn git_odb_hash(
+        out: *mut git_oid,
+        data: *const c_void,
+        len: size_t,
+        otype: git_object_t,
+    ) -> c_int;
+
+    pub fn git_odb_hashfile(out: *mut git_oid, path: *const c_char, otype: git_object_t) -> c_int;
+
+    pub fn git_odb_exists_prefix(
+        out: *mut git_oid,
+        odb: *mut git_odb,
+        short_oid: *const git_oid,
+        len: size_t,
+    ) -> c_int;
+
+    pub fn git_odb_exists(odb: *mut git_odb, oid: *const git_oid) -> c_int;
+    pub fn git_odb_exists_ext(odb: *mut git_odb, oid: *const git_oid, flags: c_uint) -> c_int;
+
+    pub fn git_odb_refresh(odb: *mut git_odb) -> c_int;
+
+    pub fn git_odb_object_id(obj: *mut git_odb_object) -> *const git_oid;
+    pub fn git_odb_object_size(obj: *mut git_odb_object) -> size_t;
+    pub fn git_odb_object_type(obj: *mut git_odb_object) -> git_object_t;
+    pub fn git_odb_object_data(obj: *mut git_odb_object) -> *const c_void;
+    pub fn git_odb_object_dup(out: *mut *mut git_odb_object, obj: *mut git_odb_object) -> c_int;
+    pub fn git_odb_object_free(obj: *mut git_odb_object);
+
+    pub fn git_odb_init_backend(odb: *mut git_odb_backend, version: c_uint) -> c_int;
+
+    pub fn git_odb_add_backend(
+        odb: *mut git_odb,
+        backend: *mut git_odb_backend,
+        priority: c_int,
+    ) -> c_int;
+
+    pub fn git_odb_backend_pack(
+        out: *mut *mut git_odb_backend,
+        objects_dir: *const c_char,
+    ) -> c_int;
+
+    pub fn git_odb_backend_one_pack(
+        out: *mut *mut git_odb_backend,
+        objects_dir: *const c_char,
+    ) -> c_int;
+
+    pub fn git_odb_add_disk_alternate(odb: *mut git_odb, path: *const c_char) -> c_int;
+
+    pub fn git_odb_backend_loose(
+        out: *mut *mut git_odb_backend,
+        objects_dir: *const c_char,
+        compression_level: c_int,
+        do_fsync: c_int,
+        dir_mode: c_uint,
+        file_mode: c_uint,
+    ) -> c_int;
+
+    pub fn git_odb_add_alternate(
+        odb: *mut git_odb,
+        backend: *mut git_odb_backend,
+        priority: c_int,
+    ) -> c_int;
+
+    pub fn git_odb_backend_malloc(backend: *mut git_odb_backend, len: size_t) -> *mut c_void;
+
+    pub fn git_odb_num_backends(odb: *mut git_odb) -> size_t;
+    pub fn git_odb_get_backend(
+        backend: *mut *mut git_odb_backend,
+        odb: *mut git_odb,
+        position: size_t,
+    ) -> c_int;
+
+    // mempack
+    pub fn git_mempack_new(out: *mut *mut git_odb_backend) -> c_int;
+    pub fn git_mempack_reset(backend: *mut git_odb_backend) -> c_int;
+    pub fn git_mempack_dump(
+        pack: *mut git_buf,
+        repo: *mut git_repository,
+        backend: *mut git_odb_backend,
+    ) -> c_int;
+
+    // refdb
+    pub fn git_refdb_new(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
+    pub fn git_refdb_open(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
+    pub fn git_refdb_backend_fs(
+        out: *mut *mut git_refdb_backend,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_refdb_init_backend(backend: *mut git_refdb_backend, version: c_uint) -> c_int;
+    pub fn git_refdb_set_backend(refdb: *mut git_refdb, backend: *mut git_refdb_backend) -> c_int;
+    pub fn git_refdb_compress(refdb: *mut git_refdb) -> c_int;
+    pub fn git_refdb_free(refdb: *mut git_refdb);
+
+    // rebase
+    pub fn git_rebase_init_options(opts: *mut git_rebase_options, version: c_uint) -> c_int;
+    pub fn git_rebase_init(
+        out: *mut *mut git_rebase,
+        repo: *mut git_repository,
+        branch: *const git_annotated_commit,
+        upstream: *const git_annotated_commit,
+        onto: *const git_annotated_commit,
+        opts: *const git_rebase_options,
+    ) -> c_int;
+    pub fn git_rebase_open(
+        out: *mut *mut git_rebase,
+        repo: *mut git_repository,
+        opts: *const git_rebase_options,
+    ) -> c_int;
+    pub fn git_rebase_operation_entrycount(rebase: *mut git_rebase) -> size_t;
+    pub fn git_rebase_operation_current(rebase: *mut git_rebase) -> size_t;
+    pub fn git_rebase_operation_byindex(
+        rebase: *mut git_rebase,
+        idx: size_t,
+    ) -> *mut git_rebase_operation;
+    pub fn git_rebase_orig_head_id(rebase: *mut git_rebase) -> *const git_oid;
+    pub fn git_rebase_orig_head_name(rebase: *mut git_rebase) -> *const c_char;
+    pub fn git_rebase_next(
+        operation: *mut *mut git_rebase_operation,
+        rebase: *mut git_rebase,
+    ) -> c_int;
+    pub fn git_rebase_inmemory_index(index: *mut *mut git_index, rebase: *mut git_rebase) -> c_int;
+    pub fn git_rebase_commit(
+        id: *mut git_oid,
+        rebase: *mut git_rebase,
+        author: *const git_signature,
+        committer: *const git_signature,
+        message_encoding: *const c_char,
+        message: *const c_char,
+    ) -> c_int;
+    pub fn git_rebase_abort(rebase: *mut git_rebase) -> c_int;
+    pub fn git_rebase_finish(rebase: *mut git_rebase, signature: *const git_signature) -> c_int;
+    pub fn git_rebase_free(rebase: *mut git_rebase);
+
+    // cherrypick
+    pub fn git_cherrypick_init_options(opts: *mut git_cherrypick_options, version: c_uint)
+        -> c_int;
+    pub fn git_cherrypick(
+        repo: *mut git_repository,
+        commit: *mut git_commit,
+        options: *const git_cherrypick_options,
+    ) -> c_int;
+    pub fn git_cherrypick_commit(
+        out: *mut *mut git_index,
+        repo: *mut git_repository,
+        cherrypick_commit: *mut git_commit,
+        our_commit: *mut git_commit,
+        mainline: c_uint,
+        merge_options: *const git_merge_options,
+    ) -> c_int;
+
+    // apply
+    pub fn git_apply_options_init(opts: *mut git_apply_options, version: c_uint) -> c_int;
+    pub fn git_apply_to_tree(
+        out: *mut *mut git_index,
+        repo: *mut git_repository,
+        preimage: *mut git_tree,
+        diff: *mut git_diff,
+        options: *const git_apply_options,
+    ) -> c_int;
+    pub fn git_apply(
+        repo: *mut git_repository,
+        diff: *mut git_diff,
+        location: git_apply_location_t,
+        options: *const git_apply_options,
+    ) -> c_int;
+
+    // revert
+    pub fn git_revert_options_init(opts: *mut git_revert_options, version: c_uint) -> c_int;
+    pub fn git_revert_commit(
+        out: *mut *mut git_index,
+        repo: *mut git_repository,
+        revert_commit: *mut git_commit,
+        our_commit: *mut git_commit,
+        mainline: c_uint,
+        merge_options: *const git_merge_options,
+    ) -> c_int;
+    pub fn git_revert(
+        repo: *mut git_repository,
+        commit: *mut git_commit,
+        given_opts: *const git_revert_options,
+    ) -> c_int;
+
+    // Common
+    pub fn git_libgit2_version(major: *mut c_int, minor: *mut c_int, rev: *mut c_int) -> c_int;
+    pub fn git_libgit2_features() -> c_int;
+    pub fn git_libgit2_opts(option: c_int, ...) -> c_int;
+
+    // Worktrees
+    pub fn git_worktree_list(out: *mut git_strarray, repo: *mut git_repository) -> c_int;
+    pub fn git_worktree_lookup(
+        out: *mut *mut git_worktree,
+        repo: *mut git_repository,
+        name: *const c_char,
+    ) -> c_int;
+    pub fn git_worktree_open_from_repository(
+        out: *mut *mut git_worktree,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_worktree_free(wt: *mut git_worktree);
+    pub fn git_worktree_validate(wt: *const git_worktree) -> c_int;
+    pub fn git_worktree_add_options_init(
+        opts: *mut git_worktree_add_options,
+        version: c_uint,
+    ) -> c_int;
+    pub fn git_worktree_add(
+        out: *mut *mut git_worktree,
+        repo: *mut git_repository,
+        name: *const c_char,
+        path: *const c_char,
+        opts: *const git_worktree_add_options,
+    ) -> c_int;
+    pub fn git_worktree_lock(wt: *mut git_worktree, reason: *const c_char) -> c_int;
+    pub fn git_worktree_unlock(wt: *mut git_worktree) -> c_int;
+    pub fn git_worktree_is_locked(reason: *mut git_buf, wt: *const git_worktree) -> c_int;
+    pub fn git_worktree_name(wt: *const git_worktree) -> *const c_char;
+    pub fn git_worktree_path(wt: *const git_worktree) -> *const c_char;
+    pub fn git_worktree_prune_options_init(
+        opts: *mut git_worktree_prune_options,
+        version: c_uint,
+    ) -> c_int;
+    pub fn git_worktree_is_prunable(
+        wt: *mut git_worktree,
+        opts: *mut git_worktree_prune_options,
+    ) -> c_int;
+    pub fn git_worktree_prune(
+        wt: *mut git_worktree,
+        opts: *mut git_worktree_prune_options,
+    ) -> c_int;
+
+    // Ref transactions
+    pub fn git_transaction_new(out: *mut *mut git_transaction, repo: *mut git_repository) -> c_int;
+    pub fn git_transaction_lock_ref(tx: *mut git_transaction, refname: *const c_char) -> c_int;
+    pub fn git_transaction_set_target(
+        tx: *mut git_transaction,
+        refname: *const c_char,
+        target: *const git_oid,
+        sig: *const git_signature,
+        msg: *const c_char,
+    ) -> c_int;
+    pub fn git_transaction_set_symbolic_target(
+        tx: *mut git_transaction,
+        refname: *const c_char,
+        target: *const c_char,
+        sig: *const git_signature,
+        msg: *const c_char,
+    ) -> c_int;
+    pub fn git_transaction_set_reflog(
+        tx: *mut git_transaction,
+        refname: *const c_char,
+        reflog: *const git_reflog,
+    ) -> c_int;
+    pub fn git_transaction_remove(tx: *mut git_transaction, refname: *const c_char) -> c_int;
+    pub fn git_transaction_commit(tx: *mut git_transaction) -> c_int;
+    pub fn git_transaction_free(tx: *mut git_transaction);
+
+    // Mailmap
+    pub fn git_mailmap_new(out: *mut *mut git_mailmap) -> c_int;
+    pub fn git_mailmap_from_buffer(
+        out: *mut *mut git_mailmap,
+        buf: *const c_char,
+        len: size_t,
+    ) -> c_int;
+    pub fn git_mailmap_from_repository(
+        out: *mut *mut git_mailmap,
+        repo: *mut git_repository,
+    ) -> c_int;
+    pub fn git_mailmap_free(mm: *mut git_mailmap);
+    pub fn git_mailmap_resolve_signature(
+        out: *mut *mut git_signature,
+        mm: *const git_mailmap,
+        sig: *const git_signature,
+    ) -> c_int;
+    pub fn git_mailmap_add_entry(
+        mm: *mut git_mailmap,
+        real_name: *const c_char,
+        real_email: *const c_char,
+        replace_name: *const c_char,
+        replace_email: *const c_char,
+    ) -> c_int;
+
+    // email
+    pub fn git_email_create_from_diff(
+        out: *mut git_buf,
+        diff: *mut git_diff,
+        patch_idx: usize,
+        patch_count: usize,
+        commit_id: *const git_oid,
+        summary: *const c_char,
+        body: *const c_char,
+        author: *const git_signature,
+        given_opts: *const git_email_create_options,
+    ) -> c_int;
+
+    pub fn git_email_create_from_commit(
+        out: *mut git_buf,
+        commit: *mut git_commit,
+        given_opts: *const git_email_create_options,
+    ) -> c_int;
+
+    pub fn git_trace_set(level: git_trace_level_t, cb: git_trace_cb) -> c_int;
+}
+
+pub fn init() {
+    use std::sync::Once;
+
+    static INIT: Once = Once::new();
+    INIT.call_once(|| unsafe {
+        openssl_init();
+        ssh_init();
+        let rc = git_libgit2_init();
+        if rc >= 0 {
+            // Note that we intentionally never schedule `git_libgit2_shutdown`
+            // to get called. There's not really a great time to call that and
+            // #276 has some more info about how automatically doing it can
+            // cause problems.
+            return;
+        }
+
+        let git_error = git_error_last();
+        let error = if !git_error.is_null() {
+            CStr::from_ptr((*git_error).message).to_string_lossy()
+        } else {
+            "unknown error".into()
+        };
+        panic!(
+            "couldn't initialize the libgit2 library: {}, error: {}",
+            rc, error
+        );
+    });
+}
+
+#[cfg(all(unix, feature = "https"))]
+#[doc(hidden)]
+pub fn openssl_init() {
+    openssl_sys::init();
+}
+
+#[cfg(any(windows, not(feature = "https")))]
+#[doc(hidden)]
+pub fn openssl_init() {}
+
+#[cfg(feature = "ssh")]
+fn ssh_init() {
+    libssh2::init();
+}
+
+#[cfg(not(feature = "ssh"))]
+fn ssh_init() {}
+
+#[doc(hidden)]
+pub fn vendored() -> bool {
+    cfg!(libgit2_vendored)
+}