Function spawn

test/external/clone.js:178–188

(command, args, opts, cb)

})

function spawn (command, args, opts, cb) {
  if (!opts.stdio) opts.stdio = argv.quiet ? 'ignore' : 'inherit'

  const child = crossSpawn(command, args, opts)
  child.on('error', cb)
  child.on('close', code => {
    if (code !== 0) return cb(new Error(`non-zero exit code: ${code}`))
    cb(null)
  })
  return child
}