lib.rs

extern crate cc;

use std::env;
use std::ffi::{OsStr, OsString};
use std::fs;
use std::path::{Path, PathBuf};
use std::process::Command;

pub fn source_dir() -> PathBuf {
    Path::new(env!("CARGO_MANIFEST_DIR")).join("openssl")
}

pub fn version() -> &'static str {
    env!("CARGO_PKG_VERSION")
}

pub struct Build {
    out_dir: Option<PathBuf>,
    target: Option<String>,
    host: Option<String>,
    // Only affects non-windows builds for now.
    openssl_dir: Option<PathBuf>,
}

pub struct Artifacts {
    include_dir: PathBuf,
    lib_dir: PathBuf,
    bin_dir: PathBuf,
    libs: Vec<String>,
    target: String,
}

impl Build {
    pub fn new() -> Build {
        Build {
            out_dir: env::var_os("OUT_DIR").map(|s| PathBuf::from(s).join("openssl-build")),
            target: env::var("TARGET").ok(),
            host: env::var("HOST").ok(),
            openssl_dir: Some(PathBuf::from("/usr/local/ssl")),
        }
    }

    pub fn out_dir<P: AsRef<Path>>(&mut self, path: P) -> &mut Build {
        self.out_dir = Some(path.as_ref().to_path_buf());
        self
    }

    pub fn target(&mut self, target: &str) -> &mut Build {
        self.target = Some(target.to_string());
        self
    }

    pub fn host(&mut self, host: &str) -> &mut Build {
        self.host = Some(host.to_string());
        self
    }

    pub fn openssl_dir<P: AsRef<Path>>(&mut self, path: P) -> &mut Build {
        self.openssl_dir = Some(path.as_ref().to_path_buf());
        self
    }

    fn cmd_make(&self) -> Result<Command, &'static str> {
        let host = &self.host.as_ref().ok_or("HOST dir not set")?[..];
        Ok(
            if host.contains("dragonfly")
                || host.contains("freebsd")
                || host.contains("openbsd")
                || host.contains("solaris")
                || host.contains("illumos")
            {
                Command::new("gmake")
            } else {
                Command::new("make")
            },
        )
    }

    #[cfg(windows)]
    fn check_env_var(&self, var_name: &str) -> Option<bool> {
        env::var_os(var_name).and_then(|s| {
            if s == "1" {
                // a message to stdout, let user know asm is force enabled
                println!(
                    "cargo:warning={}: nasm.exe is force enabled by the \
                    'OPENSSL_RUST_USE_NASM' env var.",
                    env!("CARGO_PKG_NAME")
                );
                Some(true)
            } else if s == "0" {
                // a message to stdout, let user know asm is force disabled
                println!(
                    "cargo:warning={}: nasm.exe is force disabled by the \
                    'OPENSSL_RUST_USE_NASM' env var.",
                    env!("CARGO_PKG_NAME")
                );
                Some(false)
            } else {
                println!(
                    "cargo:warning=The environment variable {} is set to an unacceptable value: {:?}",
                    var_name, s
                );
                None
            }
        })
    }

    #[cfg(windows)]
    fn is_nasm_ready(&self) -> bool {
        self.check_env_var("OPENSSL_RUST_USE_NASM")
            .unwrap_or_else(|| {
                // On Windows, use cmd `where` command to check if nasm is installed
                Command::new("cmd")
                    .args(&["/C", "where nasm"])
                    .output()
                    .map(|w| w.status.success())
                    .unwrap_or(false)
            })
    }

    #[cfg(not(windows))]
    fn is_nasm_ready(&self) -> bool {
        // We assume that nobody would run nasm.exe on a non-windows system.
        false
    }

    /// Exits the process on failure. Use `try_build` to handle the error.
    pub fn build(&mut self) -> Artifacts {
        match self.try_build() {
            Ok(a) => a,
            Err(e) => {
                println!("cargo:warning=openssl-src: failed to build OpenSSL from source");
                eprintln!("\n\n\n{e}\n\n\n");
                std::process::exit(1);
            }
        }
    }

    pub fn try_build(&mut self) -> Result<Artifacts, String> {
        let target = &self.target.as_ref().ok_or("TARGET dir not set")?[..];
        let host = &self.host.as_ref().ok_or("HOST dir not set")?[..];
        let out_dir = self.out_dir.as_ref().ok_or("OUT_DIR not set")?;
        let build_dir = out_dir.join("build");
        let install_dir = out_dir.join("install");

        if build_dir.exists() {
            fs::remove_dir_all(&build_dir).map_err(|e| format!("build_dir: {e}"))?;
        }
        if install_dir.exists() {
            fs::remove_dir_all(&install_dir).map_err(|e| format!("install_dir: {e}"))?;
        }

        let inner_dir = build_dir.join("src");
        fs::create_dir_all(&inner_dir).map_err(|e| format!("{}: {e}", inner_dir.display()))?;
        cp_r(&source_dir(), &inner_dir)?;

        let perl_program =
            env::var("OPENSSL_SRC_PERL").unwrap_or(env::var("PERL").unwrap_or("perl".to_string()));
        let mut configure = Command::new(perl_program);
        configure.arg("./Configure");

        // Change the install directory to happen inside of the build directory.
        if host.contains("pc-windows-gnu") {
            configure.arg(&format!("--prefix={}", sanitize_sh(&install_dir)));
        } else if host.contains("pc-windows-msvc") || host.contains("win7-windows-msvc") {
            // On Windows, the prefix argument does not support \ path seperators
            // when cross compiling.
            // Always use / as a path seperator instead of \, since that works for both
            // native and cross builds.
            configure.arg(&format!(
                "--prefix={}",
                install_dir
                    .to_str()
                    .ok_or("bad install_dir")?
                    .replace("\\", "/")
            ));
        } else {
            configure.arg(&format!("--prefix={}", install_dir.display()));
        }

        // Specify that openssl directory where things are loaded at runtime is
        // not inside our build directory. Instead this should be located in the
        // default locations of the OpenSSL build scripts, or as specified by whatever
        // configured this builder.
        if target.contains("windows") {
            configure.arg("--openssldir=SYS$MANAGER:[OPENSSL]");
        } else {
            let openssl_dir = self
                .openssl_dir
                .as_ref()
                .ok_or("path to the openssl directory must be set")?;
            let mut dir_arg: OsString = "--openssldir=".into();
            dir_arg.push(openssl_dir);
            configure.arg(dir_arg);
        }

        configure
            // No shared objects, we just want static libraries
            .arg("no-shared")
            // Should be off by default on OpenSSL 1.1.0, but let's be extra sure
            .arg("no-ssl3")
            // No need to build tests, we won't run them anyway
            .arg("no-tests")
            // Nothing related to zlib please
            .arg("no-comp")
            .arg("no-zlib")
            .arg("no-zlib-dynamic")
            // Avoid multilib-postfix for build targets that specify it
            .arg("--libdir=lib");

        if cfg!(feature = "no-dso") {
            // engine requires DSO support
            if cfg!(feature = "force-engine") {
                println!("Feature 'force-engine' requires DSO, ignoring 'no-dso' feature.");
            } else {
                configure.arg("no-dso");
            }
        }

        if cfg!(not(feature = "legacy")) {
            configure.arg("no-legacy");
        }

        if cfg!(feature = "weak-crypto") {
            configure
                .arg("enable-md2")
                .arg("enable-rc5")
                .arg("enable-weak-ssl-ciphers");
        } else {
            configure
                .arg("no-md2")
                .arg("no-rc5")
                .arg("no-weak-ssl-ciphers");
        }

        if cfg!(not(feature = "camellia")) {
            configure.arg("no-camellia");
        }

        if cfg!(not(feature = "idea")) {
            configure.arg("no-idea");
        }

        if cfg!(not(feature = "seed")) {
            configure.arg("no-seed");
        }

        if cfg!(feature = "ktls") {
            configure.arg("enable-ktls");
        }

        if target.contains("musl") {
            // Engine module fails to compile on musl (it needs linux/version.h
            // right now) but we don't actually need this most of the time.
            // Disable engine module unless force-engine feature specified
            if !cfg!(feature = "force-engine") {
                configure.arg("no-engine");
            }
        } else if target.contains("windows") {
            // We can build the engine feature, but the build doesn't seem
            // to correctly pick up crypt32.lib functions such as
            // `__imp_CertOpenStore` when building the capieng engine.
            // Let's disable just capieng.
            configure.arg("no-capieng");
        }

        if target.contains("musl") {
            // MUSL doesn't implement some of the libc functions that the async
            // stuff depends on, and we don't bind to any of that in any case.
            configure.arg("no-async");
        }

        // On Android it looks like not passing no-stdio may cause a build
        // failure (#13), but most other platforms need it for things like
        // loading system certificates so only disable it on Android.
        if target.contains("android") {
            configure.arg("no-stdio");
        }

        if target.contains("msvc") {
            // On MSVC we need nasm.exe to compile the assembly files.
            // ASM compiling will be enabled if nasm.exe is installed, unless
            // the environment variable `OPENSSL_RUST_USE_NASM` is set.
            if self.is_nasm_ready() {
                // a message to stdout, let user know asm is enabled
                println!(
                    "{}: Enable the assembly language routines in building OpenSSL.",
                    env!("CARGO_PKG_NAME")
                );
            } else {
                configure.arg("no-asm");
            }
        }

        let os = match target {
            "aarch64-apple-darwin" => "darwin64-arm64-cc",
            // Note that this, and all other android targets, aren't using the
            // `android64-aarch64` (or equivalent) builtin target. That
            // apparently has a crazy amount of build logic in OpenSSL 1.1.1
            // that bypasses basically everything `cc` does, so let's just cop
            // out and say it's linux and hope it works.
            "aarch64-linux-android" => "linux-aarch64",
            "aarch64-unknown-freebsd" => "BSD-generic64",
            "aarch64-unknown-openbsd" => "BSD-generic64",
            "aarch64-unknown-linux-gnu" => "linux-aarch64",
            "aarch64-unknown-linux-musl" => "linux-aarch64",
            "aarch64-alpine-linux-musl" => "linux-aarch64",
            "aarch64-chimera-linux-musl" => "linux-aarch64",
            "aarch64-unknown-netbsd" => "BSD-generic64",
            "aarch64_be-unknown-netbsd" => "BSD-generic64",
            "aarch64-pc-windows-msvc" => "VC-WIN64-ARM",
            "aarch64-uwp-windows-msvc" => "VC-WIN64-ARM-UWP",
            "arm-linux-androideabi" => "linux-armv4",
            "armv7-linux-androideabi" => "linux-armv4",
            "arm-unknown-linux-gnueabi" => "linux-armv4",
            "arm-unknown-linux-gnueabihf" => "linux-armv4",
            "arm-unknown-linux-musleabi" => "linux-armv4",
            "arm-unknown-linux-musleabihf" => "linux-armv4",
            "arm-chimera-linux-musleabihf" => "linux-armv4",
            "armv5te-unknown-linux-gnueabi" => "linux-armv4",
            "armv5te-unknown-linux-musleabi" => "linux-armv4",
            "armv6-unknown-freebsd" => "BSD-generic32",
            "armv6-alpine-linux-musleabihf" => "linux-armv6",
            "armv7-unknown-freebsd" => "BSD-armv4",
            "armv7-unknown-linux-gnueabi" => "linux-armv4",
            "armv7-unknown-linux-musleabi" => "linux-armv4",
            "armv7-unknown-linux-gnueabihf" => "linux-armv4",
            "armv7-unknown-linux-musleabihf" => "linux-armv4",
            "armv7-alpine-linux-musleabihf" => "linux-armv4",
            "armv7-chimera-linux-musleabihf" => "linux-armv4",
            "armv7-unknown-netbsd-eabihf" => "BSD-generic32",
            "asmjs-unknown-emscripten" => "gcc",
            "i586-unknown-linux-gnu" => "linux-elf",
            "i586-unknown-linux-musl" => "linux-elf",
            "i586-alpine-linux-musl" => "linux-elf",
            "i586-unknown-netbsd" => "BSD-x86-elf",
            "i686-apple-darwin" => "darwin-i386-cc",
            "i686-linux-android" => "linux-elf",
            "i686-pc-windows-gnu" => "mingw",
            "i686-pc-windows-msvc" => "VC-WIN32",
            "i686-win7-windows-msvc" => "VC-WIN32",
            "i686-unknown-freebsd" => "BSD-x86-elf",
            "i686-unknown-haiku" => "haiku-x86",
            "i686-unknown-linux-gnu" => "linux-elf",
            "i686-unknown-linux-musl" => "linux-elf",
            "i686-unknown-netbsd" => "BSD-x86-elf",
            "i686-uwp-windows-msvc" => "VC-WIN32-UWP",
            "loongarch64-unknown-linux-gnu" => "linux-generic64",
            "loongarch64-unknown-linux-musl" => "linux-generic64",
            "mips-unknown-linux-gnu" => "linux-mips32",
            "mips-unknown-linux-musl" => "linux-mips32",
            "mips64-unknown-linux-gnuabi64" => "linux64-mips64",
            "mips64-unknown-linux-muslabi64" => "linux64-mips64",
            "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
            "mips64el-unknown-linux-muslabi64" => "linux64-mips64",
            "mipsel-unknown-linux-gnu" => "linux-mips32",
            "mipsel-unknown-linux-musl" => "linux-mips32",
            "powerpc-unknown-freebsd" => "BSD-ppc",
            "powerpc-unknown-linux-gnu" => "linux-ppc",
            "powerpc-unknown-linux-gnuspe" => "linux-ppc",
            "powerpc-chimera-linux-musl" => "linux-ppc",
            "powerpc-unknown-netbsd" => "BSD-generic32",
            "powerpc64-unknown-freebsd" => "BSD-ppc64",
            "powerpc64-unknown-linux-gnu" => "linux-ppc64",
            "powerpc64-unknown-linux-musl" => "linux-ppc64",
            "powerpc64-chimera-linux-musl" => "linux-ppc64",
            "powerpc64le-unknown-freebsd" => "BSD-ppc64le",
            "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",
            "powerpc64le-unknown-linux-musl" => "linux-ppc64le",
            "powerpc64le-alpine-linux-musl" => "linux-ppc64le",
            "powerpc64le-chimera-linux-musl" => "linux-ppc64le",
            "riscv64gc-unknown-freebsd" => "BSD-riscv64",
            "riscv64gc-unknown-linux-gnu" => "linux64-riscv64",
            "riscv64gc-unknown-linux-musl" => "linux64-riscv64",
            "riscv64-alpine-linux-musl" => "linux64-riscv64",
            "riscv64-chimera-linux-musl" => "linux64-riscv64",
            "riscv64gc-unknown-netbsd" => "BSD-generic64",
            "s390x-unknown-linux-gnu" => "linux64-s390x",
            "sparc64-unknown-netbsd" => "BSD-generic64",
            "s390x-unknown-linux-musl" => "linux64-s390x",
            "s390x-alpine-linux-musl" => "linux64-s390x",
            "sparcv9-sun-solaris" => "solaris64-sparcv9-gcc",
            "thumbv7a-uwp-windows-msvc" => "VC-WIN32-ARM-UWP",
            "x86_64-apple-darwin" => "darwin64-x86_64-cc",
            "x86_64-linux-android" => "linux-x86_64",
            "x86_64-linux" => "linux-x86_64",
            "x86_64-pc-windows-gnu" => "mingw64",
            "x86_64-pc-windows-gnullvm" => "mingw64",
            "x86_64-pc-windows-msvc" => "VC-WIN64A",
            "x86_64-win7-windows-msvc" => "VC-WIN64A",
            "x86_64-unknown-freebsd" => "BSD-x86_64",
            "x86_64-unknown-dragonfly" => "BSD-x86_64",
            "x86_64-unknown-haiku" => "haiku-x86_64",
            "x86_64-unknown-illumos" => "solaris64-x86_64-gcc",
            "x86_64-unknown-linux-gnu" => "linux-x86_64",
            "x86_64-unknown-linux-musl" => "linux-x86_64",
            "x86_64-alpine-linux-musl" => "linux-x86_64",
            "x86_64-chimera-linux-musl" => "linux-x86_64",
            "x86_64-unknown-openbsd" => "BSD-x86_64",
            "x86_64-unknown-netbsd" => "BSD-x86_64",
            "x86_64-uwp-windows-msvc" => "VC-WIN64A-UWP",
            "x86_64-sun-solaris" => "solaris64-x86_64-gcc",
            "wasm32-unknown-emscripten" => "gcc",
            "wasm32-unknown-unknown" => "gcc",
            "wasm32-wasi" => "gcc",
            "aarch64-apple-ios" => "ios64-cross",
            "x86_64-apple-ios" => "iossimulator-xcrun",
            "aarch64-apple-ios-sim" => "iossimulator-xcrun",
            "aarch64-unknown-linux-ohos" => "linux-aarch64",
            "armv7-unknown-linux-ohos" => "linux-generic32",
            "x86_64-unknown-linux-ohos" => "linux-x86_64",
            _ => {
                return Err(format!(
                    "don't know how to configure OpenSSL for {}",
                    target
                ))
            }
        };

        let mut ios_isysroot: std::option::Option<String> = None;

        configure.arg(os);

        // If we're not on MSVC we configure cross compilers and cross tools and
        // whatnot. Note that this doesn't happen on MSVC b/c things are pretty
        // different there and this isn't needed most of the time anyway.
        if !target.contains("msvc") {
            let mut cc = cc::Build::new();
            cc.target(target).host(host).warnings(false).opt_level(2);
            let compiler = cc.get_compiler();
            let mut cc_env = compiler.cc_env();
            if cc_env.is_empty() {
                cc_env = compiler.path().to_path_buf().into_os_string();
            }
            configure.env("CC", cc_env);
            let path = compiler.path().to_str().ok_or("compiler path")?;

            // Both `cc::Build` and `./Configure` take into account
            // `CROSS_COMPILE` environment variable. So to avoid double
            // prefix, we unset `CROSS_COMPILE` for `./Configure`.
            configure.env_remove("CROSS_COMPILE");

            let ar = cc.get_archiver();
            configure.env("AR", ar.get_program());
            if ar.get_args().count() != 0 {
                // On some platforms (like emscripten on windows), the ar to use may not be a
                // single binary, but instead a multi-argument command like `cmd /c emar.bar`.
                // We can't convey that through `AR` alone, and so also need to set ARFLAGS.
                configure.env(
                    "ARFLAGS",
                    ar.get_args().collect::<Vec<_>>().join(OsStr::new(" ")),
                );
            }
            let ranlib = cc.get_ranlib();
            // OpenSSL does not support RANLIBFLAGS. Jam the flags in RANLIB.
            let mut args = vec![ranlib.get_program()];
            args.extend(ranlib.get_args());
            configure.env("RANLIB", args.join(OsStr::new(" ")));

            // Make sure we pass extra flags like `-ffunction-sections` and
            // other things like ARM codegen flags.
            let mut skip_next = false;
            let mut is_isysroot = false;
            for arg in compiler.args() {
                // For whatever reason `-static` on MUSL seems to cause
                // issues...
                if target.contains("musl") && arg == "-static" {
                    continue;
                }

                // cc includes an `-arch` flag for Apple platforms, but we've
                // already selected an arch implicitly via the target above, and
                // OpenSSL contains about the conflict if both are specified.
                if target.contains("apple") {
                    if arg == "-arch" {
                        skip_next = true;
                        continue;
                    }
                }

                // cargo-lipo specifies this but OpenSSL complains
                if target.contains("apple-ios") {
                    if arg == "-isysroot" {
                        is_isysroot = true;
                        continue;
                    }

                    if is_isysroot {
                        is_isysroot = false;
                        ios_isysroot = Some(arg.to_str().ok_or("isysroot arg")?.to_string());
                        continue;
                    }
                }

                if skip_next {
                    skip_next = false;
                    continue;
                }

                configure.arg(arg);
            }

            if os.contains("iossimulator") {
                if let Some(ref isysr) = ios_isysroot {
                    configure.env(
                        "CC",
                        &format!(
                            "xcrun -sdk iphonesimulator cc -isysroot {}",
                            sanitize_sh(&Path::new(isysr))
                        ),
                    );
                }
            }

            if target == "x86_64-pc-windows-gnu" {
                // For whatever reason OpenSSL 1.1.1 fails to build on
                // `x86_64-pc-windows-gnu` in our docker container due to an
                // error about "too many sections". Having no idea what this
                // error is about some quick googling yields
                // https://github.com/cginternals/glbinding/issues/135 which
                // mysteriously mentions `-Wa,-mbig-obj`, passing a new argument
                // to the assembler. Now I have no idea what `-mbig-obj` does
                // for Windows nor why it would matter, but it does seem to fix
                // compilation issues.
                //
                // Note that another entirely unrelated issue -
                // https://github.com/assimp/assimp/issues/177 - was fixed by
                // splitting a large file, so presumably OpenSSL has a large
                // file soemwhere in it? Who knows!
                configure.arg("-Wa,-mbig-obj");
            }

            if target.contains("pc-windows-gnu") && path.ends_with("-gcc") {
                // As of OpenSSL 1.1.1 the build system is now trying to execute
                // `windres` which doesn't exist when we're cross compiling from
                // Linux, so we may need to instruct it manually to know what
                // executable to run.
                let windres = format!("{}-windres", &path[..path.len() - 4]);
                configure.env("WINDRES", &windres);
            }

            if target.contains("emscripten") {
                // As of OpenSSL 1.1.1 the source apparently wants to include
                // `stdatomic.h`, but this doesn't exist on Emscripten. After
                // reading OpenSSL's source where the error is, we define this
                // magical (and probably
                // compiler-internal-should-not-be-user-defined) macro to say
                // "no atomics are available" and avoid including such a header.
                configure.arg("-D__STDC_NO_ATOMICS__");
            }

            if target.contains("wasi") {
                configure.args([
                    // Termios isn't available whatsoever on WASM/WASI so we disable that
                    "no-ui-console",
                    // WASI doesn't support UNIX sockets so we preemptively disable it
                    "no-sock",
                    // WASI doesn't have a concept of syslog, so we disable it
                    "-DNO_SYSLOG",
                    // WASI doesn't support (p)threads. Disabling preemptively.
                    "no-threads",
                    // WASI/WASM aren't really friends with ASM, so we disable it as well.
                    "no-asm",
                    // Disables the AFALG engine (AFALG-ENGine)
                    // Since AFALG depends on `AF_ALG` support on the linux kernel side
                    // it makes sense that we can't use it.
                    "no-afalgeng",
                    "-DOPENSSL_NO_AFALGENG=1",
                    // wasm lacks signal support; to enable minimal signal emulation, compile with
                    // -D_WASI_EMULATED_SIGNAL and link with -lwasi-emulated-signal
                    // The link argument is output in the `Artifacts::print_cargo_metadata` method
                    "-D_WASI_EMULATED_SIGNAL",
                    // WASI lacks process-associated clocks; to enable emulation of the `times` function using the wall
                    // clock, which isn't sensitive to whether the program is running or suspended, compile with
                    // -D_WASI_EMULATED_PROCESS_CLOCKS and link with -lwasi-emulated-process-clocks
                    // The link argument is output in the `Artifacts::print_cargo_metadata` method
                    "-D_WASI_EMULATED_PROCESS_CLOCKS",
                    // WASI lacks a true mmap; to enable minimal mmap emulation, compile
                    // with -D_WASI_EMULATED_MMAN and link with -lwasi-emulated-mman
                    // The link argument is output in the `Artifacts::print_cargo_metadata` method
                    "-D_WASI_EMULATED_MMAN",
                    // WASI lacks process identifiers; to enable emulation of the `getpid` function using a
                    // placeholder value, which doesn't reflect the host PID of the program, compile with
                    // -D_WASI_EMULATED_GETPID and link with -lwasi-emulated-getpid
                    // The link argument is output in the `Artifacts::print_cargo_metadata` method
                    "-D_WASI_EMULATED_GETPID",
                    // WASI doesn't have chmod right now, so don't try to use it.
                    "-DNO_CHMOD",
                ]);
            }

            if target.contains("musl") {
                // Hack around openssl/openssl#7207 for now
                configure.arg("-DOPENSSL_NO_SECURE_MEMORY");
            }
        }

        // And finally, run the perl configure script!
        configure.current_dir(&inner_dir);
        self.run_command(configure, "configuring OpenSSL build")?;

        // On MSVC we use `nmake.exe` with a slightly different invocation, so
        // have that take a different path than the standard `make` below.
        if target.contains("msvc") {
            let mut build =
                cc::windows_registry::find(target, "nmake.exe").ok_or("failed to find nmake")?;
            build.arg("build_libs").current_dir(&inner_dir);
            self.run_command(build, "building OpenSSL")?;

            let mut install =
                cc::windows_registry::find(target, "nmake.exe").ok_or("failed to find nmake")?;
            install.arg("install_dev").current_dir(&inner_dir);
            self.run_command(install, "installing OpenSSL")?;
        } else {
            let mut depend = self.cmd_make()?;
            depend.arg("depend").current_dir(&inner_dir);
            self.run_command(depend, "building OpenSSL dependencies")?;

            let mut build = self.cmd_make()?;
            build.arg("build_libs").current_dir(&inner_dir);
            if !cfg!(windows) {
                if let Some(s) = env::var_os("CARGO_MAKEFLAGS") {
                    build.env("MAKEFLAGS", s);
                }
            }

            if let Some(ref isysr) = ios_isysroot {
                let components: Vec<&str> = isysr.split("/SDKs/").collect();
                build.env("CROSS_TOP", components[0]);
                build.env("CROSS_SDK", components[1]);
            }

            self.run_command(build, "building OpenSSL")?;

            let mut install = self.cmd_make()?;
            install.arg("install_dev").current_dir(&inner_dir);
            self.run_command(install, "installing OpenSSL")?;
        }

        let libs = if target.contains("msvc") {
            vec!["libssl".to_string(), "libcrypto".to_string()]
        } else {
            vec!["ssl".to_string(), "crypto".to_string()]
        };

        fs::remove_dir_all(&inner_dir).map_err(|e| format!("{}: {e}", inner_dir.display()))?;

        Ok(Artifacts {
            lib_dir: install_dir.join("lib"),
            bin_dir: install_dir.join("bin"),
            include_dir: install_dir.join("include"),
            libs: libs,
            target: target.to_string(),
        })
    }

    #[track_caller]
    fn run_command(&self, mut command: Command, desc: &str) -> Result<(), String> {
        println!("running {:?}", command);
        let status = command.status();

        let verbose_error = match status {
            Ok(status) if status.success() => return Ok(()),
            Ok(status) => format!(
                "'{exe}' reported failure with {status}",
                exe = command.get_program().to_string_lossy()
            ),
            Err(failed) => match failed.kind() {
                std::io::ErrorKind::NotFound => format!(
                    "Command '{exe}' not found. Is {exe} installed?",
                    exe = command.get_program().to_string_lossy()
                ),
                _ => format!(
                    "Could not run '{exe}', because {failed}",
                    exe = command.get_program().to_string_lossy()
                ),
            },
        };
        println!("cargo:warning={desc}: {verbose_error}");
        Err(format!(
            "Error {desc}:
    {verbose_error}
    Command failed: {command:?}"
        ))
    }
}

fn cp_r(src: &Path, dst: &Path) -> Result<(), String> {
    for f in fs::read_dir(src).map_err(|e| format!("{}: {e}", src.display()))? {
        let f = match f {
            Ok(f) => f,
            _ => continue,
        };
        let path = f.path();
        let name = path
            .file_name()
            .ok_or_else(|| format!("bad dir {}", src.display()))?;

        // Skip git metadata as it's been known to cause issues (#26) and
        // otherwise shouldn't be required
        if name.to_str() == Some(".git") {
            continue;
        }

        let dst = dst.join(name);
        let ty = f.file_type().map_err(|e| e.to_string())?;
        if ty.is_dir() {
            fs::create_dir_all(&dst).map_err(|e| e.to_string())?;
            cp_r(&path, &dst)?;
        } else if ty.is_symlink() && path.iter().any(|p| p == "cloudflare-quiche") {
            // not needed to build
            continue;
        } else {
            let _ = fs::remove_file(&dst);
            if let Err(e) = fs::copy(&path, &dst) {
                return Err(format!(
                    "failed to copy '{}' to '{}': {e}",
                    path.display(),
                    dst.display()
                ));
            }
        }
    }
    Ok(())
}

fn sanitize_sh(path: &Path) -> String {
    if !cfg!(windows) {
        return path.to_string_lossy().into_owned();
    }
    let path = path.to_string_lossy().replace("\\", "/");
    return change_drive(&path).unwrap_or(path);

    fn change_drive(s: &str) -> Option<String> {
        let mut ch = s.chars();
        let drive = ch.next().unwrap_or('C');
        if ch.next() != Some(':') {
            return None;
        }
        if ch.next() != Some('/') {
            return None;
        }
        Some(format!("/{}/{}", drive, &s[drive.len_utf8() + 2..]))
    }
}

impl Artifacts {
    pub fn include_dir(&self) -> &Path {
        &self.include_dir
    }

    pub fn lib_dir(&self) -> &Path {
        &self.lib_dir
    }

    pub fn libs(&self) -> &[String] {
        &self.libs
    }

    pub fn print_cargo_metadata(&self) {
        println!("cargo:rustc-link-search=native={}", self.lib_dir.display());
        for lib in self.libs.iter() {
            println!("cargo:rustc-link-lib=static={}", lib);
        }
        println!("cargo:include={}", self.include_dir.display());
        println!("cargo:lib={}", self.lib_dir.display());
        if self.target.contains("windows") {
            println!("cargo:rustc-link-lib=user32");
            println!("cargo:rustc-link-lib=crypt32");
        } else if self.target == "wasm32-wasi" {
            println!("cargo:rustc-link-lib=wasi-emulated-signal");
            println!("cargo:rustc-link-lib=wasi-emulated-process-clocks");
            println!("cargo:rustc-link-lib=wasi-emulated-mman");
            println!("cargo:rustc-link-lib=wasi-emulated-getpid");
        }
    }
}