odl 3.1.0

flexible download library and CLI intended to be fast, reliable, and easy to use.
Documentation 
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const PROTO: &str = "src/proto/download_metadata.proto";

fn main() {
    // The target triple names the release asset `odl update` must fetch.
    // `std::env::consts` cannot tell gnu from musl, and installing the wrong
    // one produces a binary that will not start.
    println!(
        "cargo:rustc-env=ODL_BUILD_TARGET={}",
        std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string())
    );

    // `protox` parses the schema in Rust, so building odl needs no `protoc`
    // on the machine and no C++ toolchain to vendor one. `prost-build` is
    // still what generates the code — it is handed a descriptor set rather
    // than left to shell out for one.
    println!("cargo:rerun-if-changed={PROTO}");
    let descriptors = protox::compile([PROTO], ["src/"]).unwrap();
    prost_build::Config::new().compile_fds(descriptors).unwrap();
}