century.js

#!/usr/bin/env node

'use strict';

var fs = require('fs')

var argv    = require('minimist')(process.argv.slice(2))
var spawn   = require('child_process').spawn
var binding = require('./build/Release/binding.node')

var interactive = argv.interactive
var verbose     = argv.verbose  || argv.v
var ival        = argv.interval || argv.i || 3000;
var args = argv._
var exec = args.shift()


function log(){
  if (verbose) console.log.apply(console, arguments)
}

function firstRunner(exec)
{
  fs.stat(exec, function(error, stats)
  {
    if(error)
    {
      console.log('No EXEC command found, starting REPL session')

      return require('repl').start('century> ').on('exit', function()
      {
        console.log('Got "exit" event from repl!');
        process.exit(2);
      });
    }

    // setup wait interval

    setInterval(function(){
      log('calling wait')

      var status = binding.wait()

      log('status', status)
    }, ival)

    log('wait interval: %sms', ival)


    // start first runner

    var opts = {
      // the child should be attached to the same terminal
      // as the init process, in case the user wants an
      // immediately interactive experience
      stdio: 'inherit'
    }

    var proc = spawn(exec, args, opts)

    proc.on('exit', function(code, signal)
    {
      log('first runner exited')

      // do not exit 0 when first runner is terminated via signal
      if(signal) code = 3

      log('signal', signal ? signal : code)

      // shutdown in interactive mode
      if(interactive) process.exit(code)
    })
  })
}


if(!exec)
{
  if(interactive)
  {
    console.log('Usage: init [ARGS...] EXEC')

    process.exit(1)
  }

  // Exec command not defined, try to exec default at initramfs /sbin/init
  exec = '/sbin/init';
}

firstRunner(exec);