Deploy Ghost Script

deploy.js

var shell   = Promise.promisifyAll(require('shelljs'));

module.exports = function deploy(req, res){

  shell.execAsync('git remote update')
  .then(function(output){
    res.write(output.toString());
  })
  .then(function(){
    return shell.execAsync('git status -uno');
  })
  .then(function(output){
    res.write(output.toString());

    if(output.indexOf('behind') > -1){
      return shell.execAsync('npm install')
      .then(function(){
        return shell.execAsync('git reset --hard origin/HEAD');
      })
      .then(function(){
        return shell.execAsync('pm2 restart ghost');
      })
      .then(function(){
        res.write('Deployed');
      });
    }
  })
  .catch(function(e){
    res.write(e.toString());
  }).then(function(){
    res.end();
  });

};