Method _openPack

lib/cache/PackFileCacheStrategy.js:1227–1388

* Returns the pack. * @returns {Promise<Pack>} the pack

()

	 * @returns {Promise<Pack>} the pack
	 */
	_openPack() {
		const { logger, profile, cacheLocation, version } = this;
		/** @type {Snapshot} */
		let buildSnapshot;
		/** @type {BuildDependencies} */
		let buildDependencies;
		/** @type {BuildDependencies} */
		let newBuildDependencies;
		/** @type {Snapshot} */
		let resolveBuildDependenciesSnapshot;
		/** @type {ResolveResults | undefined} */
		let resolveResults;
		logger.time(class="st">"restore cache container");
		return this.fileSerializer
			.deserialize(null, {
				filename: `${cacheLocation}/index${this._extension}`,
				extension: `${this._extension}`,
				logger,
				profile,
				retainedBuffer: this.allowCollectingMemory
					? allowCollectingMemory
					: undefined
			})
			.catch((err) => {
				if (err.code !== class="st">"ENOENT") {
					logger.warn(
						`Restoring pack failed from ${cacheLocation}${this._extension}: ${err}`
					);
					logger.debug(err.stack);
				} else {
					logger.debug(
						`No pack exists at ${cacheLocation}${this._extension}: ${err}`
					);
				}
				return undefined;
			})
			.then((packContainer) => {
				logger.timeEnd(class="st">"restore cache container");
				if (!packContainer) return;
				if (!(packContainer instanceof PackContainer)) {
					logger.warn(
						`Restored pack from ${cacheLocation}${this._extension}, but contained content is unexpected.`,
						packContainer
					);
					return;
				}
				if (packContainer.version !== version) {
					logger.log(
						`Restored pack from ${cacheLocation}${this._extension}, but version doesn't match.`
					);
					return;
				}
				logger.time(class="st">"check build dependencies");
				return Promise.all([
					new Promise((resolve, _reject) => {
						this.fileSystemInfo.checkSnapshotValid(
							packContainer.buildSnapshot,
							(err, valid) => {