landstrip 0.17.38

Sandbox for coding agents with parametrized state
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// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (c) 2026 Jarkko Sakkinen

#![deny(clippy::all)]
#![deny(clippy::pedantic)]
#![deny(clippy::unwrap_used)]
#![deny(clippy::expect_used)]
#![deny(clippy::panic)]

mod cli;
mod config;
mod engine;
mod platform;

use crate::cli::{Cli, Invocation, parse_cli};
use crate::config::load_settings;
use crate::engine::error::Error;
use crate::engine::policy::resolve_policy;
use crate::engine::trap::Trap;
use crate::engine::trap_fd::TrapFd;
use anyhow::Result;
use std::error::Error as StdError;
use std::process;

fn main() {
    let invocation = match parse_cli() {
        Ok(invocation) => invocation,
        Err(error) => {
            // The trap fd is part of arguments that just failed to parse, so a
            // usage trap can only go to stderr.
            if let Error::Usage { message } = &error {
                eprintln!("{message}");
            }
            Trap::from_error(&error).emit();
            process::exit(2);
        }
    };

    let (result, trap_fd) = match &invocation {
        Invocation::Run(cli) => (run_with_cli(cli), TrapFd::from_fd(cli.trap_fd)),
        Invocation::Windows(command) => (platform::manage_windows(command), TrapFd::from_fd(None)),
    };
    if let Err(error) = result {
        let trap = error
            .chain()
            .find_map(<dyn StdError + 'static>::downcast_ref::<Error>)
            .map_or_else(|| Trap::internal(format!("{error:#}")), Trap::from_error);
        trap_fd.write(&trap);
        trap.emit();
        log::error!("{error:#}");
        process::exit(1);
    }
}

fn run_with_cli(cli: &Cli) -> Result<()> {
    let default_filter = if cli.debug { "debug" } else { "warn" };

    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or(default_filter))
        .format_timestamp(None)
        .init();

    let cwd = std::env::current_dir().map_err(|source| Error::PolicyIoFailed { source })?;

    log::debug!("cli: cwd: {}", cwd.display());
    let mut settings = load_settings(&cli.policy_paths, cli.format, Some(&cli.tool), &cwd)?;
    // Backend selection belongs to the trusted host invocation, not to a
    // project-controlled policy file.
    settings.windows.backend = cli.windows_backend;
    let policy = resolve_policy(
        &settings.filesystem,
        &settings.network,
        &settings.windows,
        &cwd,
    )?;

    let trap_fd = TrapFd::from_fd(cli.trap_fd);

    platform::execute(&policy, &cli.tool, &cli.tool_args, &trap_fd)
}