libcwtch 0.4.0

libcwtch is an interface to a Cwtch app that allows creating of profiles to communicate with contacts over the Cwtch protocol
Documentation 
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use std::{env, io};
use std::fs;
use std::path::Path;
use std::process::Command;

use hex_literal::hex;
use sha2::{Digest, Sha512};

fn main() {

    // Do not fetch lib on docs.rs as it cannot, build will fail, docs won't build
    // https://docs.rs/about/builds
    if std::env::var("DOCS_RS").is_err() {
        let out_dir = env::var_os("OUT_DIR").unwrap();
        println!("cargo:rustc-flags=-L {}", out_dir.to_str().unwrap());
        println!("cargo:rustc-link-lib=Cwtch");

        println!("cargo:rerun-if-changed=build.rs");
        println!("cargo:rerun-if-changed=libCwtch.h");

        let lib_cwtch_path = Path::new(&out_dir).join("libCwtch.so");
        if std::env::var("LCG_DIR").is_err() {
            // https://git.openprivacy.ca/cwtch.im/libcwtch-go/releases v1.7.1
            Command::new("wget")
                .arg("https://git.openprivacy.ca/attachments/98184e9c-1dc7-431a-9601-91a9e763e8fc")
                .arg("-O")
                .arg(lib_cwtch_path.clone())
                .output()
                .expect("failed to download libCwtch.so");

            let mut hasher = Sha512::new();
            let mut file = fs::File::open(&lib_cwtch_path).expect("could not open lib to hash");
            io::copy(&mut file, &mut hasher).expect("failed to copy file into hasher");
            let hash_bytes = hasher.finalize();

            assert_eq!(hash_bytes[..], hex!("cb4368d72a46f8046261c50e6e9ecf170d8e606871d5de2c1e9e34303533c344f92f5d946d7e12614581dfa3ae8e638512af7f4623ed91b1ceb1570de14bf192")[..]);
        } else {
            let local_lcg = Path::new(std::env::var("LCG_DIR").unwrap().as_str()).join("libCwtch.so");
            fs::copy(local_lcg, lib_cwtch_path).expect("could not find local lcg");
        }
    }
}