Lines of src/lib.rs from check-in 3c858ed7c4 that are changed by the sequence of edits moving toward check-in 713c1e7fb2:

3c858ed7c4 2026-07-31    1: mod mail;
                         2: mod telegram;
                         3: pub mod utils;
                         4: 
                         5: use crate::mail::MailServer;
                         6: 
                         7: use just_getopt::{
                         8: 	OptFlags,
                         9: 	OptSpecs,
                        10: 	OptValue,
                        11: };
                        12: use smol::{
                        13: 	fs::metadata,
                        14: };
                        15: use stacked_errors::{
                        16: 	Result,
                        17: 	StackableErr,
                        18: 	bail,
3c858ed7c4 2026-07-31   19: };
3c858ed7c4 2026-07-31   20: 
3c858ed7c4 2026-07-31   21: use std::{
3c858ed7c4 2026-07-31   22: 	io::Cursor,
3c858ed7c4 2026-07-31   23: 	os::unix::fs::PermissionsExt,
3c858ed7c4 2026-07-31   24: 	path::Path,
                        25: };
                        26: 
                        27: /// Actual main function running async with Error propagation support
                        28: pub async fn async_main () -> Result<()> {
                        29: 	let specs = OptSpecs::new()
                        30: 		.option("help", "h", OptValue::None)
                        31: 		.option("help", "help", OptValue::None)
                        32: 		.option("config", "c", OptValue::Required)
                        33: 		.option("config", "config", OptValue::Required)
                        34: 		.flag(OptFlags::OptionsEverywhere);
                        35: 	let mut args = std::env::args();
                        36: 	args.next();
                        37: 	let parsed = specs.getopt(args);
                        38: 	for u in &parsed.unknown {
                        39: 		println!("Unknown option: {u}");
                        40: 	}
                        41: 	if !(parsed.unknown.is_empty()) || parsed.options_first("help").is_some() {
                        42: 		println!("SMTP2TG v{}, (C) 2024 - 2026\n\n\
                        43: 			\t-h|--help\tDisplay this help\n\
                        44: 			\t-c|--config …\tSet configuration file location.",
                        45: 			env!("CARGO_PKG_VERSION"));
                        46: 		return Ok(());
                        47: 	};
                        48: 	let config_file = Path::new(if let Some(path) = parsed.options_value_last("config") {
                        49: 		&path[..]
                        50: 	} else {
                        51: 		"smtp2tg.toml"
                        52: 	});
                        53: 	if !config_file.exists() {
                        54: 		bail!("can't read configuration from {config_file:?}");
                        55: 	};
                        56: 	{
                        57: 		let meta = metadata(config_file).await.stack()?;
                        58: 		if (!0o100600 & meta.permissions().mode()) > 0 {
                        59: 			bail!("other users can read or write config file {config_file:?}\n\
                        60: 				File permissions: {:o}", meta.permissions().mode());
                        61: 		}
                        62: 	}
                        63: 	let settings: config::Config = config::Config::builder()
                        64: 		.set_default("api_gateway", "https://api.telegram.org").stack()?
                        65: 		.set_default("fields", vec!["date", "from", "subject"]).stack()?
                        66: 		.set_default("hostname", "smtp.2.tg").stack()?
                        67: 		.set_default("listen_on", "0.0.0.0:1025").stack()?
                        68: 		.set_default("unknown", "relay").stack()?
3c858ed7c4 2026-07-31   69: 		.set_default("domains", vec!["localhost", hostname::get().stack()?.to_str().expect("Failed to get current hostname")]).stack()?
                        70: 		.add_source(config::File::from(config_file))
                        71: 		.build()
                        72: 		.with_context(|| format!("[{config_file:?}] there was an error reading config\n\
                        73: 			\tplease consult \"smtp2tg.toml.example\" for details"))?;
                        74: 
                        75: 	let listen_on = settings.get_string("listen_on").stack()?;
                        76: 	let server_name = settings.get_string("hostname").stack()?;
                        77: 	let core = MailServer::new(settings)?;
                        78: 	let mut server = mailin_embedded::Server::new(core);
                        79: 
                        80: 	server.with_name(server_name)
                        81: 		.with_ssl(mailin_embedded::SslConfig::None).unwrap()
                        82: 		.with_addr(listen_on).unwrap();
                        83: 	server.serve().unwrap();
                        84: 
                        85: 	Ok(())
                        86: }