rho-coding-agent 1.39.0

A lightweight agent harness inspired by Pi
Documentation 
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//! The exact environment a hook program receives.
//!
//! A hook child never inherits the ambient environment. It gets a fixed base set
//! plus the names the hook allowlisted, and nothing else, so provider
//! credentials and unrelated secrets cannot reach a hook program by accident.

use std::collections::BTreeMap;

use crate::child_env;

/// Names in the documented base set, part of the spawn contract.
///
/// [`super::IN_HOOK_ENV`] is always set as well; it is Rho's own marker rather
/// than an inherited value, so it is listed separately in the contract.
pub fn base_environment_names() -> &'static [&'static str] {
    child_env::base_names()
}

/// Builds the child environment from `read`, which supplies ambient values.
///
/// Variables that are unset in the parent are simply absent from the child. A
/// hook that needs one must handle its absence; the runtime does not invent a
/// value or fail the spawn, because a missing optional token is a hook concern.
pub fn child_environment<F>(allowlist: &[String], mut read: F) -> BTreeMap<String, String>
where
    F: FnMut(&str) -> Option<String>,
{
    let mut environment = child_env::collect_base(&mut read);
    for name in allowlist {
        if let Some(value) = read(name) {
            environment.insert(name.clone(), value);
        }
    }
    // Stops a hook that runs `rho` from re-entering the hooks that invoked it.
    environment.insert(super::IN_HOOK_ENV.to_owned(), "1".into());
    environment
}

/// Reads the ambient environment for [`child_environment`].
pub fn ambient(name: &str) -> Option<String> {
    std::env::var(name).ok()
}

#[cfg(test)]
#[path = "environment_tests.rs"]
mod tests;