Method _install

tests/helpers/package-cache.js:516–523

* The `_install` method installs the contents of the manifest into the * specified package cache. * * @private * @method _install * @param {String} label The label for the cache. * @param {String} type The type of package cache.

(label, type)

   * @param {String} type The type of package cache.
   */
  _install(label, type) {
    this._removeLinks(label, type);
    commands[type].invoke('install', { cwd: this.dirs[label] });
    this._restoreLinks(label, type);

    // If we just did a clean install we can treat it as up-to-date.
    upgraded[label] = true;
  }

  /**
   * The `_upgrade` method guarantees that the contents of the manifest are