Allow empty connection root for FTP connections.

composer.json

@@ -23,6 +23,7 @@
     },
     "require-dev": {
         "ext-fileinfo": "*",
+        "ext-ftp": "*",
         "phpunit/phpunit": "^8.5 || ^9.4",
         "phpstan/phpstan": "^0.12.26",
         "phpseclib/phpseclib": "^2.0",

src/Ftp/FtpAdapter.php

@@ -27,6 +27,9 @@
 use League\MimeTypeDetection\MimeTypeDetector;
 use Throwable;
 
+use function ftp_chdir;
+use function ftp_pwd;
+
 class FtpAdapter implements FilesystemAdapter
 {
     private const SYSTEM_TYPE_WINDOWS = 'windows';
@@ -77,6 +80,8 @@ class FtpAdapter implements FilesystemAdapter
      */
     private $mimeTypeDetector;
 
+    private ?string $rootDirectory = null;
+
     public function __construct(
         FtpConnectionOptions $connectionOptions,
         FtpConnectionProvider $connectionProvider = null,
@@ -111,14 +116,15 @@ private function connection()
         start:
         if ( ! $this->hasFtpConnection()) {
             $this->connection = $this->connectionProvider->createConnection($this->connectionOptions);
+            $this->rootDirectory = $this->resolveConnectionRoot($this->connection);
         }
 
         if ($this->connectivityChecker->isConnected($this->connection) === false) {
             $this->connection = false;
             goto start;
         }
 
-        ftp_chdir($this->connection, $this->connectionOptions->root());
+        ftp_chdir($this->connection, $this->rootDirectory);
 
         return $this->connection;
     }
@@ -434,15 +440,15 @@ private function normalizeUnixObject(string $item, string $base): StorageAttribu
         $isDirectory = $this->listingItemIsDirectory($permissions);
         $permissions = $this->normalizePermissions($permissions);
         $path = $base === '' ? $name : rtrim($base, '/') . '/' . $name;
-        $lastModified = $this->connectionOptions->timestampsOnUnixListingsEnabled()
-            ? $this->normalizeUnixTimestamp($month, $day, $timeOrYear)
-            : null;
+        $lastModified = $this->connectionOptions->timestampsOnUnixListingsEnabled() ? $this->normalizeUnixTimestamp(
+            $month,
+            $day,
+            $timeOrYear
+        ) : null;
 
         if ($isDirectory) {
             return new DirectoryAttributes(
-                $path,
-                $this->visibilityConverter->inverseForDirectory($permissions),
-                $lastModified
+                $path, $this->visibilityConverter->inverseForDirectory($permissions), $lastModified
             );
         }
 
@@ -622,4 +628,15 @@ private function hasFtpConnection(): bool
     {
         return $this->connection instanceof \FTP\Connection || is_resource($this->connection);
     }
+
+    private function resolveConnectionRoot($connection): string
+    {
+        $root = $this->connectionOptions->root();
+
+        if ($root !== '') {
+            ftp_chdir($connection, $root);
+        }
+
+        return ftp_pwd($connection);
+    }
 }