Method create

tests/helpers/package-cache.js:571–600

* The `create` method adds a new package cache entry. * * @method create * @param {String} label The label for the cache. * @param {String} type The type of package cache. * @param {String} manifest The contents of the manifest file for the cache. * @param {Array} links Packages to

(label, type, manifest, links)

   * @return {String} The directory on disk which contains the cache.
   */
  create(label, type, manifest, links) {
    links = links || [];

    // Save metadata about the PackageCache invocation in the manifest.
    let packageManagerVersion = commands[type].invoke('--version').stdout;

    let jsonManifest = JSON.parse(manifest);
    jsonManifest._packageCache = {
      node: process.version,
      packageManager: type,
      packageManagerVersion,
      links,
    };

    manifest = JSON.stringify(jsonManifest);

    // Compare any existing manifest to the ideal per current blueprint.
    let identical = this._checkManifest(label, type, manifest);

    if (identical) {
      // Use what we have, but opt in to SemVer drift.
      this._upgrade(label, type);
    } else {
      // Tell the package manager to start semi-fresh.
      this._writeManifest(label, type, manifest);
      this._install(label, type);
    }

    return this.dirs[label];
  }

  /**
   * The `update` method aliases the `create` method.