cargo-worktree 1.0.0

Deterministic build namespace layer for Cargo
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use anyhow::Result;
use std::collections::HashMap;
use std::path::Path;

pub type EnvMap = HashMap<String, String>;

pub fn build_env(target_dir: Option<&Path>) -> Result<EnvMap> {
    let mut env = EnvMap::new();

    if let Some(target_dir) = target_dir {
        env.insert(
            "CARGO_TARGET_DIR".to_string(),
            target_dir.to_string_lossy().to_string(),
        );
    }

    if which::which("sccache").is_ok() {
        env.insert("RUSTC_WRAPPER".to_string(), "sccache".to_string());
    }

    env.insert("CARGO_BUILD_DEP_INFO_BASEDIR".to_string(), ".".to_string());

    Ok(env)
}