upgrade.js

/**
 * 
 * npm package updated
 * 
 * 
 */

 var upgrade = (function () {
    return {
      /**
       * Should call the callback with a new version number, or false
       */
      check: function (callback) {
        try {
          var packageObj = require('./package.json')
  
          var childProcess = require('child_process')
          childProcess.exec('npm info --json ' + packageObj.name, function (error, stdout, stderr) {
            if (error) {
              callback(null, null)
              return
            }
            var output
            try {
              output = JSON.parse(stdout)
            } catch (e) {
              callback(null, null)
              return
            }
            if (output['dist-tags']['latest'] !== packageObj.version) {
              callback(output['dist-tags']['latest'])
            } else {
              callback(null, null)
            }
          })
        } catch (e) {
          callback(null, null)
        }
      },
      /**
       * This will install the update and relaunch
       */
      install: function (packageName, vars) {
        var sudo = require('sudo')
        console.log('')
        console.log('Installing vtop update...')
        console.log('')
        console.log(' ** You will need to enter your password to upgrade ** ')
        console.log('')
  
        var args = ['npm', 'install', '-g', 'vtop']
        console.log(args.join(' '))
  
        var options = {
          cachePassword: false,
          prompt: 'Password:',
          spawnOptions: { stdio: 'inherit' }
        }
        var child = sudo(args, options)
  
        var path = false
        child.stdout.on('data', function (data) {
          console.log(data.toString())
  
          if (data.toString().indexOf('vtop.js') !== -1) {
            path = data.toString().trim().split(' ')[2]
          }
        })
        child.stderr.on('data', function (data) {
          console.log(data.toString())
        })
  
        child.on('close', function () {
          for (var file in require.cache) {
            delete require.cache[file]
          }
          console.log('Finished updating. Clearing cache and relaunching...')
          setTimeout(function () {
            for (var v in vars) {
              process[v] = vars[v]
            }
            require(path)
          }, 1000)
        })
      }
    }
  }())
  
  module.exports = upgrade