Allow to run Laravel under custom vendor location

src/HandlerResolver.php

@@ -72,13 +72,7 @@ private function laravel(): Application
             return $this->laravel;
         }
 
-        $bootstrapFile = getcwd() . '/bootstrap/app.php';
-
-        if (! file_exists($bootstrapFile)) {
-            throw new RuntimeException(
-                "Unable to locate `{$bootstrapFile}`: Bref tried to load that file to retrieve the Laravel app"
-            );
-        }
+        $bootstrapFile = LaravelPathFinder::app();
 
         $this->laravel = require $bootstrapFile;
 

src/LaravelPathFinder.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Bref\LaravelBridge;
+
+use RuntimeException;
+
+final class LaravelPathFinder
+{
+    /**
+     * Resolve the Laravel root path. Path is always returned without a leading slash.
+     *
+     * @return string
+     */
+    public static function root(): string
+    {
+        $app = $_SERVER['LAMBDA_TASK_ROOT'] . '/bootstrap/app.php';
+
+        // If the config cache exists, we can assume that the Laravel root path is the same as the Lambda task root.
+        // This may not be needed as the fallback "should" work in all cases, but we're keeping
+        // this as it's safer to keep 100% compatibility with the original implementation.
+        if (file_exists($app)) {
+            return $_SERVER['LAMBDA_TASK_ROOT'];
+        }
+
+        // If Laravel is installed on a sub-folder, we can navigate from where we are
+        // (inside composer) to the root of Laravel.
+        // We will go up 4 directories, represented by `vendor/brefphp/laravel-bridge/src`.
+        return realpath(__DIR__ . '/../../../../');
+    }
+
+    public static function app(): string
+    {
+        $bootstrapFile = self::root() . '/bootstrap/app.php';
+
+        if (file_exists($bootstrapFile)) {
+            return $bootstrapFile;
+        }
+
+        throw new RuntimeException(
+            "Unable to locate `{$bootstrapFile}`: Bref tried to load that file to retrieve the Laravel app"
+        );
+    }
+}

src/bref-init.php

@@ -1,7 +1,7 @@
 <?php
 
 use Bref\Bref;
-
+use Bref\LaravelBridge\LaravelPathFinder;
 use Bref\LaravelBridge\HandlerResolver;
 use Bref\LaravelBridge\MaintenanceMode;
 use Bref\LaravelBridge\StorageDirectories;
@@ -11,6 +11,8 @@
         define('STDERR', fopen('php://stderr', 'wb'));
     }
 
+    $laravelRoot = LaravelPathFinder::root();
+
     StorageDirectories::create();
 
     MaintenanceMode::setUp();
@@ -26,7 +28,7 @@
         return;
     }
 
-    $defaultConfigCachePath = $_SERVER['LAMBDA_TASK_ROOT'] . '/bootstrap/cache/config.php';
+    $defaultConfigCachePath = $laravelRoot . '/bootstrap/cache/config.php';
 
     if (file_exists($defaultConfigCachePath)) {
         return;
@@ -47,7 +49,7 @@
             $outputDestination = '1>&2';
         }
 
-        passthru("php artisan config:cache {$outputDestination}");
+        passthru("php $laravelRoot/artisan config:cache {$outputDestination}");
     }
 });