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/*
* einhyrningsins: graceful restarts for socket-based daemons
* Copyright (C) 2016 Bryan Newbold <bnewbold@robocracy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
extern crate getopts;
extern crate log;
extern crate env_logger;
use std::env;
use std::u64;
use std::str::FromStr;
use std::{time, thread};
use std::process::exit;
use std::process::Command;
use getopts::Options;
fn run(prog: Vec<String>, number: u64) {
for _ in 0..number {
println!("Running!");
Command::new(&prog[0])
.args(&prog[1..])
.spawn()
.expect("command failed");
}
println!("Sleeping for 1sec");
thread::sleep(time::Duration::from_secs(1));
}
fn print_usage(opts: Options) {
let brief = "usage:\teinhyrningsins [options] program";
println!("");
print!("{}", opts.usage(&brief));
}
fn main() {
let args: Vec<String> = env::args().collect();
let mut opts = Options::new();
opts.optflag("h", "help", "print this help menu");
opts.optflag("v", "verbose", "more debugging messages");
opts.optopt("n", "number", "how many program copies to spawn", "COUNT");
opts.optmulti("b", "bind", "socket(s) to bind to", "ADDR");
let matches = match opts.parse(&args[1..]) {
Ok(m) => { m }
Err(f) => { println!("{}", f.to_string()); print_usage(opts); exit(-1); }
};
if matches.opt_present("h") {
print_usage(opts);
return;
}
let number: u64 = match matches.opt_str("number") {
Some(n) => u64::from_str(&n).unwrap(),
None => 1
};
let program_and_args = if !matches.free.is_empty() {
matches.free
} else {
print_usage(opts);
exit(-1);
};
let mut builder = env_logger::LogBuilder::new();
builder.parse("INFO");
if env::var("RUST_LOG").is_ok() {
builder.parse(&env::var("RUST_LOG").unwrap());
}
builder.init().unwrap();
run(program_and_args, number);
}
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