wp-env: Fix errors which prevent it from working without internet

packages/env/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Enhancement
+
+-   `wp-env` now works offline after the environment has been created. Note that many `wp-env` configuration changes involve internet connectivity and may not work in offline mode. [#53547](https://github.com/WordPress/gutenberg/pull/53547)
+
 ## 8.10.0 (2023-10-18)
 
 ### Bug Fix

packages/env/lib/cache.js

@@ -40,6 +40,9 @@ async function didCacheChange( key, value, options ) {
  * @param {WPEnvCacheOptions} options Parsing options
  */
 async function setCache( key, value, options ) {
+	// Make sure the cache directory exists.
+	await fs.mkdir( options.workDirectoryPath, { recursive: true } );
+
 	const existingCache = await getCacheFile( options );
 	existingCache[ key ] = value;
 

packages/env/lib/commands/start.js

@@ -28,6 +28,7 @@ const {
 	configureWordPress,
 	setupWordPressDirectories,
 	readWordPressVersion,
+	canAccessWPORG,
 } = require( '../wordpress' );
 const { didCacheChange, setCache } = require( '../cache' );
 const md5 = require( '../md5' );
@@ -77,16 +78,24 @@ module.exports = async function start( {
 	const configHash = md5( config );
 	const { workDirectoryPath, dockerComposeConfigPath } = config;
 	const shouldConfigureWp =
-		update ||
-		( await didCacheChange( CONFIG_CACHE_KEY, configHash, {
-			workDirectoryPath,
-		} ) );
+		( update ||
+			( await didCacheChange( CONFIG_CACHE_KEY, configHash, {
+				workDirectoryPath,
+			} ) ) ) &&
+		// Don't reconfigure everything when we can't connect to the internet because
+		// the majority of update tasks involve connecting to the internet. (Such
+		// as downloading sources and pulling docker images.)
+		( await canAccessWPORG() );
 
 	const dockerComposeConfig = {
 		config: dockerComposeConfigPath,
 		log: config.debug,
 	};
 
+	if ( ! ( await canAccessWPORG() ) ) {
+		spinner.info( 'wp-env is offline' );
+	}
+
 	/**
 	 * If the Docker image is already running and the `wp-env` files have been
 	 * deleted, the start command will not complete successfully. Stopping

packages/env/lib/config/parse-config.js

@@ -534,7 +534,7 @@ async function parseEnvironmentConfig(
 async function parseCoreSource( coreSource, options ) {
 	// An empty source means we should use the latest version of WordPress.
 	if ( ! coreSource ) {
-		const wpVersion = await getLatestWordPressVersion();
+		const wpVersion = await getLatestWordPressVersion( options );
 		if ( ! wpVersion ) {
 			throw new ValidationError(
 				'Could not find the latest WordPress version. There may be a network issue.'

packages/env/lib/config/test/config-integration.js

@@ -15,6 +15,8 @@ jest.mock( 'fs', () => ( {
 	promises: {
 		readFile: jest.fn(),
 		stat: jest.fn().mockResolvedValue( true ),
+		mkdir: jest.fn(),
+		writeFile: jest.fn(),
 	},
 } ) );
 

packages/env/lib/test/cache.js

@@ -18,6 +18,7 @@ jest.mock( 'fs', () => ( {
 	promises: {
 		readFile: jest.fn(),
 		writeFile: jest.fn(),
+		mkdir: jest.fn(),
 	},
 } ) );
 

packages/env/lib/wordpress.js

@@ -7,12 +7,18 @@ const util = require( 'util' );
 const fs = require( 'fs' ).promises;
 const path = require( 'path' );
 const got = require( 'got' );
+const dns = require( 'dns' ).promises;
 
 /**
  * Promisified dependencies
  */
 const copyDir = util.promisify( require( 'copy-dir' ) );
 
+/**
+ * Internal dependencies
+ */
+const { getCache, setCache } = require( './cache' );
+
 /**
  * @typedef {import('./config').WPConfig} WPConfig
  * @typedef {import('./config').WPEnvironmentConfig} WPEnvironmentConfig
@@ -243,26 +249,62 @@ async function readWordPressVersion( coreSource, spinner, debug ) {
 	return versionMatch[ 1 ];
 }
 
+/**
+ * Basically a quick check to see if we can connect to the internet.
+ *
+ * @return {boolean} True if we can connect to WordPress.org, false otherwise.
+ */
+let IS_OFFLINE;
+async function canAccessWPORG() {
+	// Avoid situations where some parts of the code think we're offline and others don't.
+	if ( IS_OFFLINE !== undefined ) {
+		return IS_OFFLINE;
+	}
+	IS_OFFLINE = !! ( await dns.resolve( 'WordPress.org' ).catch( () => {} ) );
+	return IS_OFFLINE;
+}
+
 /**
  * Returns the latest stable version of WordPress by requesting the stable-check
  * endpoint on WordPress.org.
  *
+ * @param {Object} options an object with cacheDirectoryPath set to the path to the cache directory in ~/.wp-env.
  * @return {string} The latest stable version of WordPress, like "6.0.1"
  */
 let CACHED_WP_VERSION;
-async function getLatestWordPressVersion() {
+async function getLatestWordPressVersion( options ) {
 	// Avoid extra network requests.
 	if ( CACHED_WP_VERSION ) {
 		return CACHED_WP_VERSION;
 	}
 
+	const cacheOptions = {
+		workDirectoryPath: options.cacheDirectoryPath,
+	};
+
+	// When we can't connect to the internet, we don't want to break wp-env or
+	// wait for the stable-check result to timeout.
+	if ( ! ( await canAccessWPORG() ) ) {
+		const latestVersion = await getCache(
+			'latestWordPressVersion',
+			cacheOptions
+		);
+		if ( ! latestVersion ) {
+			throw new Error(
+				'Could not find the current WordPress version in the cache and the network is not available.'
+			);
+		}
+		return latestVersion;
+	}
+
 	const versions = await got(
 		'https://api.wordpress.org/core/stable-check/1.0/'
 	).json();
 
 	for ( const [ version, status ] of Object.entries( versions ) ) {
 		if ( status === 'latest' ) {
 			CACHED_WP_VERSION = version;
+			await setCache( 'latestWordPressVersion', version, cacheOptions );
 			return version;
 		}
 	}
@@ -275,5 +317,6 @@ module.exports = {
 	resetDatabase,
 	setupWordPressDirectories,
 	readWordPressVersion,
+	canAccessWPORG,
 	getLatestWordPressVersion,
 };