@spalger/kibana/src/cli/plugin/pluginInstaller.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

var pluginDownloader = require('./pluginDownloader');
var pluginCleaner = require('./pluginCleaner');
var npmInstall = require('./npmInstall');
var fs = require('fs');

module.exports = {
  install: install
};

function install(settings, logger) {
  logger.log(`installing ${settings.package}`);

  try {
    fs.statSync(settings.pluginPath);

    logger.error(`Plugin ${settings.package} already exists. Please remove before installing a new version.`);
    process.exit(70); // eslint-disable-line no-process-exit
  } catch (e) {
    if (e.code !== 'ENOENT') throw e;
  }

  var cleaner = pluginCleaner(settings, logger);
  var downloader = pluginDownloader(settings, logger);

  return cleaner.cleanPrevious()
  .then(function () {
    return downloader.download();
  })
  .then(function () {
    return npmInstall(settings.workingPath, logger);
  })
  .then(function (curious) {
    fs.renameSync(settings.workingPath, settings.pluginPath);
    logger.log('Plugin installation complete!');
  })
  .catch(function (e) {
    logger.error(`Plugin installation was unsuccessful due to error "${e.message}"`);
    cleaner.cleanError();
    process.exit(70); // eslint-disable-line no-process-exit
  });
}