fix race conditions causing notices if directory does not exist

src/Psalm/Config.php

@@ -52,6 +52,7 @@
 use function basename;
 use function chdir;
 use function class_exists;
+use function clearstatcache;
 use function count;
 use function dirname;
 use function error_log;
@@ -2268,6 +2269,7 @@ public function getPotentialComposerFilePathForClassLike(string $class): ?string
 
     public static function removeCacheDirectory(string $dir): void
     {
+        clearstatcache(true, $dir);
         if (is_dir($dir)) {
             $objects = scandir($dir, SCANDIR_SORT_NONE);
 
@@ -2276,17 +2278,29 @@ public static function removeCacheDirectory(string $dir): void
             }
 
             foreach ($objects as $object) {
-                if ($object !== '.' && $object !== '..') {
-                    if (filetype($dir . '/' . $object) === 'dir') {
-                        self::removeCacheDirectory($dir . '/' . $object);
-                    } else {
-                        unlink($dir . '/' . $object);
-                    }
+                if ($object === '.' || $object === '..') {
+                    continue;
+                }
+
+                // if it was deleted in the meantime/race condition with other psalm process
+                if (!file_exists($dir . '/' . $object)) {
+                    continue;
+                }
+
+                if (filetype($dir . '/' . $object) === 'dir') {
+                    self::removeCacheDirectory($dir . '/' . $object);
+                } else {
+                    unlink($dir . '/' . $object);
                 }
             }
 
             reset($objects);
-            rmdir($dir);
+
+            // may have been removed in the meantime
+            clearstatcache(true, $dir);
+            if (is_dir($dir)) {
+                rmdir($dir);
+            }
         }
     }
 

src/Psalm/Internal/Analyzer/FunctionLikeAnalyzer.php

@@ -65,8 +65,6 @@
 use function array_merge;
 use function array_search;
 use function array_values;
-use function assert;
-use function class_exists;
 use function count;
 use function end;
 use function in_array;

src/Psalm/Internal/Provider/ParserCacheProvider.php

@@ -7,6 +7,7 @@
 use Psalm\Config;
 use RuntimeException;
 
+use function clearstatcache;
 use function error_log;
 use function fclose;
 use function file_get_contents;
@@ -302,6 +303,13 @@ public function saveFileContentHashes(): void
             return;
         }
 
+        // directory was removed
+        // most likely due to a race condition with other psalm instances that were manually started at the same time
+        clearstatcache(true, $root_cache_directory);
+        if (!is_dir($root_cache_directory)) {
+            return;
+        }
+
         $file_content_hashes = $this->new_file_content_hashes + $this->getExistingFileContentHashes();
 
         $file_hashes_path = $root_cache_directory . DIRECTORY_SEPARATOR . self::FILE_HASHES;