zerus 0.13.0

Lightweight tool for creating project-specific offline crates.io mirrors
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use std::process::Stdio;
use std::{fs, process::Command};

/// Work around for https://github.com/rust-lang/wg-cargo-std-aware/issues/23
pub fn prepare_build_std(version: &str) -> Option<String> {
    let sysroot = Command::new("rustc")
        .arg(format!("+{version}"))
        .arg("--print=sysroot")
        .stderr(Stdio::inherit())
        .output()
        .expect("command failed to start");

    let mut sysroot = std::str::from_utf8(&sysroot.stdout).unwrap().to_string();
    sysroot.pop();

    let base = format!("{sysroot}/lib/rustlib/src");
    if !fs::exists(&base).unwrap() {
        println!("[!] rust-src not found, running: `rustup +{version} component add rust-src`");
        let status = Command::new("rustup")
            .args([&format!("+{version}"), "component", "add", "rust-src"])
            .status()
            .expect("failed to run rustup");
        if !status.success() {
            println!("[!] failed to install rust-src");
            return None;
        }
    }
    // before: https://github.com/rust-lang/rust/commit/1f3be75f56bfa7520b86eada306ad66455b4fd6e
    let old_from = format!("{sysroot}/lib/rustlib/src/rust/Cargo.lock");
    let from = format!("{sysroot}/lib/rustlib/src/rust/library/Cargo.lock");
    let from = if fs::exists(&old_from).unwrap() {
        Some(old_from)
    } else if fs::exists(&from).unwrap() {
        Some(from)
    } else {
        None
    };
    if let Some(from) = from {
        let to = format!("{sysroot}/lib/rustlib/src/rust/library/test/Cargo.lock");
        if fs::copy(from, to).is_err() {
            println!("[!] could not write");
            return None;
        }
    }

    Some(format!(
        "{sysroot}/lib/rustlib/src/rust/library/test/Cargo.toml"
    ))
}