// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

//! The SSH front-end: publickey auth and `exec` dispatch into pack processes.
//!
//! A `russh` server accepts only `publickey` auth (matching the offered key's
//! SHA256 fingerprint against the `keys` table), handles only the `exec` channel
//! request, and streams the channel data to and from a spawned `git`
//! upload-pack/receive-pack process via [`git::pack`]. Anything else — a shell,
//! a PTY, an unrecognized command — gets a friendly banner and a non-zero exit.

mod command;
mod hostkey;
mod resolve;
mod server;

pub use crate::server::serve;

/// An error from the SSH layer.
#[derive(Debug, thiserror::Error)]
pub enum SshError {
    /// A filesystem or socket I/O error.
    #[error(transparent)]
    Io(#[from] std::io::Error),
    /// The host key could not be generated, read, or written.
    #[error("host key error: {0}")]
    HostKey(String),
    /// The russh server failed to start or run.
    #[error("ssh server error: {0}")]
    Server(String),
}