libe2fs-sys 0.2.2

Rust bindings for libe2fs
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extern crate bindgen;

use core::panic;
use std::env;
use std::path::{Path, PathBuf};

fn main() {
    // Build our specific libe2fs version!
    let pwd = std::env::current_dir().unwrap();
    let mut sys_dir = find_flail_dir(&pwd);
    sys_dir.push("libe2fs-sys");
    std::env::set_current_dir(sys_dir).unwrap();
    // /flail/libe2fs-sys
    let project_root = std::env::current_dir().unwrap();
    let res = std::process::Command::new("bash")
        .arg(format!("{}/build-e2fs.sh", project_root.display()))
        .spawn()
        .unwrap()
        .wait_with_output()
        .unwrap();
    // chdir back
    std::env::set_current_dir(pwd).unwrap();

    if !res.status.success() {
        panic!(
            "Failed to build libe2fs:\n--------\n{}\n--------\n{}\n--------\n",
            String::from_utf8(res.stdout).unwrap(),
            String::from_utf8(res.stderr).unwrap()
        );
    }

    // Tell cargo to look for shared libraries in the specified directory
    // println!("cargo:rustc-link-search=/usr/include");
    // /flail
    let project_root = project_root.parent().unwrap();
    println!(
        "cargo:rustc-link-search={}/e2fsprogs/build/lib",
        project_root.display()
    );

    // Tell cargo to tell rustc to link the system bzip2
    // shared library.
    println!("cargo:rustc-link-lib=static:+verbatim=libext2fs.a");
    println!("cargo:rustc-link-lib=static:+verbatim=libcom_err.a");

    // Tell cargo to invalidate the built crate whenever the wrapper changes
    println!("cargo:rerun-if-changed=wrapper.h");

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let bindings = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header("wrapper.h")
        .derive_debug(true)
        .derive_copy(true)
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        // Finish the builder and generate the bindings.
        .generate()
        // Unwrap the Result and panic on failure.
        .expect("Unable to generate bindings");

    // Write the bindings to the $OUT_DIR/bindings.rs file.
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");
}

fn find_flail_dir(pwd: &Path) -> PathBuf {
    if pwd.file_name().unwrap().to_string_lossy() == "flail" {
        return pwd.to_path_buf();
    }

    if let Some(parent) = pwd.parent() {
        find_flail_dir(parent)
    } else {
        panic!("Could not find libe2fs-sys directory from pwd");
    }
}