Function install

lib/API/Modules/NPM.js:165–178

(CLI, module_name, opts, cb)

};

function install(CLI, module_name, opts, cb) {
  moduleExistInLocalDB(CLI, module_name, function (exists) {
    if (exists) {
      Common.logMod('Module already installed. Updating.');

      Rollback.backup(module_name);

      return uninstall(CLI, module_name, function () {
        return continueInstall(CLI, module_name, opts, cb);
      });
    }
    return continueInstall(CLI, module_name, opts, cb);
  })
}

// Builtin Node Switch
function getNPMCommandLine(module_name, install_path) {