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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("1.6.4".."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);
}
}
}
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