Switch to environmental variables for installing SQLite/mu-plugins/ob…

…ject cache (#498)

* Use env variables to set the flags to install sqlite/object cache/mu-plugins. Ensure that standalone plugins can use sqlite without any database.

* Update src/mantle/testing/class-utils.php

Co-authored-by: Damian <4309872+attackant@users.noreply.github.com>

---------

Co-authored-by: Damian <4309872+attackant@users.noreply.github.com>

src/mantle/testing/class-utils.php

@@ -252,6 +252,19 @@ public static function env( string $variable, $default ) {
 		return false === $value ? $default : $value;
 	}
 
+	/**
+	 * Retrieve an environment variable and check if it is truthy.
+	 *
+	 * @param string $variable Variable to get.
+	 * @param bool   $default Default value used as a fallback.
+	 * @return bool
+	 */
+	public static function env_bool( string $variable, bool $default ): bool {
+		$value = static::env( $variable, $default );
+
+		return in_array( strtolower( $value ), [ 'true', '1', 'yes' ], true );
+	}
+
 	/**
 	 * Ensure an environment variable is is a valid string that can be passed to
 	 * to a shell script.
@@ -278,16 +291,12 @@ public static function shell_safe( string|bool $string ): string {
 	 * not install the WordPress database.
 	 *
 	 * @param string $directory Directory to install WordPress in.
-	 * @param bool   $install_vip_mu_plugins Whether to install VIP MU plugins, defaults to false.
-	 * @param bool   $install_object_cache Whether to install the object cache drop-in, defaults to false.
-	 * @param bool   $use_sqlite_db Whether to use SQLite for the database, defaults to false.
 	 */
-	public static function install_wordpress(
-		string $directory,
-		bool $install_vip_mu_plugins = false,
-		bool $install_object_cache = false,
-		bool $use_sqlite_db = false,
-	): void {
+	public static function install_wordpress( string $directory ): void {
+		$install_vip_mu_plugins = static::env_bool( 'MANTLE_INSTALL_VIP_MU_PLUGINS', false );
+		$install_object_cache   = static::env_bool( 'MANTLE_INSTALL_OBJECT_CACHE', false );
+		$use_sqlite_db          = static::env_bool( 'MANTLE_USE_SQLITE', false );
+
 		$branch = static::env( 'MANTLE_CI_BRANCH', 'HEAD' );
 
 		// Compile the variables to pass to the shell script.

src/mantle/testing/concerns/trait-rsync-installation.php

@@ -3,6 +3,7 @@
  * Rsync_Installation trait file
  *
  * phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedConstantFound
+ * phpcs:disable WordPress.PHP.DiscouragedPHPFunctions.runtime_configuration_putenv
  *
  * @package Mantle
  */
@@ -53,27 +54,6 @@ trait Rsync_Installation {
 	 */
 	protected ?string $rsync_subdir = '';
 
-	/**
-	 * Flag to install the VIP MU plugins.
-	 *
-	 * @var boolean
-	 */
-	protected bool $install_vip_mu_plugins = false;
-
-	/**
-	 * Flag to install a Memcache object cache drop-in.
-	 *
-	 * @var boolean
-	 */
-	protected bool $install_object_cache = false;
-
-	/**
-	 * Flag to use a SQLite db.php drop-in when rsyncing the codebase.
-	 *
-	 * @var boolean
-	 */
-	protected bool $use_sqlite_db = false;
-
 	/**
 	 * Plugin slugs or URLs to ZIP files to install after rsyncing the codebase.
 	 *
@@ -182,7 +162,7 @@ public function with_vip_mu_plugins( bool $install = true ): static {
 
 		$this->rsync_exclusions[] = 'mu-plugins';
 
-		$this->install_vip_mu_plugins = $install;
+		putenv( 'MANTLE_INSTALL_VIP_MU_PLUGINS=' . ( $install ? '1' : '0' ) );
 
 		return $this;
 	}
@@ -210,7 +190,7 @@ public function with_object_cache( bool $install = true ): static {
 
 		$this->rsync_exclusions[] = 'object-cache.php';
 
-		$this->install_object_cache = $install;
+		putenv( 'MANTLE_INSTALL_OBJECT_CACHE=' . ( $install ? '1' : '0' ) );
 
 		return $this;
 	}
@@ -229,9 +209,10 @@ public function with_sqlite( bool $install = true ): static {
 			return $this;
 		}
 
-		$this->rsync_exclusions[] = 'db.php';
+		putenv( 'MANTLE_USE_SQLITE=' . ( $install ? '1' : '0' ) );
+		putenv( 'WP_SKIP_DB_CREATE=1' );
 
-		$this->use_sqlite_db = $install;
+		$this->rsync_exclusions[] = 'db.php';
 
 		return $this;
 	}
@@ -367,13 +348,7 @@ protected function perform_rsync_testsuite() {
 				exit( 1 );
 			}
 
-			Utils::install_wordpress(
-				directory: $base_install_path,
-				install_vip_mu_plugins: $this->install_vip_mu_plugins,
-				install_object_cache: $this->install_object_cache,
-				use_sqlite_db: $this->use_sqlite_db,
-			);
-
+			Utils::install_wordpress( $base_install_path );
 			Utils::success(
 				"WordPress installed at <em>{$base_install_path}</em>",
 				'Install Rsync'