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extern crate pkg_config;
extern crate cmake;
#[cfg(target_env = "msvc")]
extern crate vcpkg;
use std::env;
use std::fs::File;
use std::io::prelude::*;
use std::path::{PathBuf, Path};
use std::process::Command;
fn main() {
if try_vcpkg() {
return;
}
register_dep("Z");
register_dep("OPENSSL");
// The system copy of libssh2 is not used by default because it
// can lead to having two copies of libssl loaded at once.
// See https://github.com/alexcrichton/ssh2-rs/pull/88
if env::var("LIBSSH2_SYS_USE_PKG_CONFIG").is_ok() {
if let Ok(lib) = pkg_config::find_library("libssh2") {
for path in &lib.include_paths {
println!("cargo:include={}", path.display());
}
return
}
}
if !Path::new("libssh2/.git").exists() {
let _ = Command::new("git").args(&["submodule", "update", "--init"])
.status();
}
let mut cfg = cmake::Config::new("libssh2");
let target = env::var("TARGET").unwrap();
// Don't use OpenSSL on Windows, instead use the native Windows backend.
if target.contains("windows") {
cfg.define("CRYPTO_BACKEND", "WinCNG");
} else {
cfg.define("CRYPTO_BACKEND", "OpenSSL");
}
// If libz-sys was built it'll give us an include directory to learn how to
// link to it, and for MinGW targets we just pass a dummy include dir to
// ensure it's detected (apparently it isn't otherwise?)
match env::var_os("DEP_Z_INCLUDE") {
Some(path) => { cfg.define("ZLIB_INCLUDE_DIR", path); }
None if target.contains("windows-gnu") => {
cfg.define("ZLIB_INCLUDE_DIR", "/");
}
None => {}
}
if let Some(path) = env::var_os("DEP_OPENSSL_INCLUDE") {
if let Some(path) = env::split_paths(&path).next() {
if let Some(path) = path.to_str() {
if path.len() > 0 {
cfg.define("OPENSSL_INCLUDE_DIR", path);
}
}
}
}
// Homebrew deprecated OpenSSL and deliberately hides it from cmake, requiring such opt-in
if target.contains("darwin") && Path::new("/usr/local/opt/openssl/include/openssl/ssl.h").exists() {
cfg.define("OPENSSL_ROOT_DIR", "/usr/local/opt/openssl/");
}
let dst = cfg.define("BUILD_SHARED_LIBS", "OFF")
.define("ENABLE_ZLIB_COMPRESSION", "ON")
.define("CMAKE_INSTALL_LIBDIR", "lib")
.define("BUILD_EXAMPLES", "OFF")
.define("BUILD_TESTING", "OFF")
.register_dep("OPENSSL")
.register_dep("Z")
.build();
// Unfortunately the pkg-config file generated for libssh2 indicates
// that it depends on zlib, but most systems don't actually have a
// zlib.pc, so pkg-config will say that libssh2 doesn't exist. We
// generally take care of the zlib dependency elsewhere, so we just
// remove that part from the pkg-config file
let mut pc = String::new();
let pkgconfig = dst.join("lib/pkgconfig/libssh2.pc");
if let Ok(mut f) = File::open(&pkgconfig) {
f.read_to_string(&mut pc).unwrap();;
drop(f);
let pc = pc.replace(",zlib", "");
let bytes = pc.as_bytes();
File::create(pkgconfig).unwrap().write_all(bytes).unwrap();
}
if target.contains("windows") {
println!("cargo:rustc-link-lib=bcrypt");
println!("cargo:rustc-link-lib=crypt32");
println!("cargo:rustc-link-lib=user32");
}
// msvc generates libssh2.lib, everywhere else generates libssh2.a
if target.contains("msvc") {
println!("cargo:rustc-link-lib=static=libssh2");
} else {
println!("cargo:rustc-link-lib=static=ssh2");
}
println!("cargo:rustc-link-search=native={}/lib", dst.display());
println!("cargo:include={}/include", dst.display());
}
fn register_dep(dep: &str) {
if let Some(s) = env::var_os(&format!("DEP_{}_ROOT", dep)) {
prepend("PKG_CONFIG_PATH", Path::new(&s).join("lib/pkgconfig"));
return
}
if let Some(s) = env::var_os(&format!("DEP_{}_INCLUDE", dep)) {
let root = Path::new(&s).parent().unwrap();
env::set_var(&format!("DEP_{}_ROOT", dep), root);
let path = root.join("lib/pkgconfig");
if path.exists() {
prepend("PKG_CONFIG_PATH", path);
return
}
}
}
fn prepend(var: &str, val: PathBuf) {
let prefix = env::var(var).unwrap_or(String::new());
let mut v = vec![val];
v.extend(env::split_paths(&prefix));
env::set_var(var, &env::join_paths(v).unwrap());
}
#[cfg(not(target_env = "msvc"))]
fn try_vcpkg() -> bool { false }
#[cfg(target_env = "msvc")]
fn try_vcpkg() -> bool {
vcpkg::Config::new()
.emit_includes(true)
.probe("libssh2").map(|_| {
// found libssh2 which depends on openssl and zlib
vcpkg::Config::new()
.lib_name("libeay32")
.lib_name("ssleay32")
.probe("openssl").expect("configured libssh2 from vcpkg but could not \
find openssl libraries that it depends on");
vcpkg::Config::new()
.lib_names("zlib", "zlib1")
.probe("zlib").expect("configured libssh2 from vcpkg but could not \
find the zlib library that it depends on");
println!("cargo:rustc-link-lib=crypt32");
println!("cargo:rustc-link-lib=gdi32");
println!("cargo:rustc-link-lib=user32");
}).is_ok()
}
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