refactor: simplify symlink cache invalidation by removing background rescan and noise_mtime in favor of a root-path-only fingerprint.

tests/config/test_symlink_fingerprint.py

@@ -0,0 +1,128 @@
+import os
+import pytest
+from py import config as config_module
+
+def _setup_paths(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    settings_dir = tmp_path / "settings"
+    loras_dir = tmp_path / "loras"
+    loras_dir.mkdir()
+    checkpoint_dir = tmp_path / "checkpoints"
+    checkpoint_dir.mkdir()
+    embedding_dir = tmp_path / "embeddings"
+    embedding_dir.mkdir()
+
+    def fake_get_folder_paths(kind: str):
+        mapping = {
+            "loras": [str(loras_dir)],
+            "checkpoints": [str(checkpoint_dir)],
+            "unet": [],
+            "embeddings": [str(embedding_dir)],
+        }
+        return mapping.get(kind, [])
+
+    monkeypatch.setattr(config_module.folder_paths, "get_folder_paths", fake_get_folder_paths)
+    monkeypatch.setattr(config_module, "standalone_mode", True)
+    monkeypatch.setattr(config_module, "get_settings_dir", lambda create=True: str(settings_dir))
+
+    return loras_dir, settings_dir
+
+def test_fingerprint_match_skips_rescan(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)
+    
+    # Track calls to _scan_symbolic_links
+    scan_calls = 0
+    original_scan = config_module.Config._scan_symbolic_links
+    
+    def wrapped_scan(self):
+        nonlocal scan_calls
+        scan_calls += 1
+        return original_scan(self)
+    
+    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", wrapped_scan)
+    
+    # 1. First initialization: should scan and cache
+    cfg1 = config_module.Config()
+    assert scan_calls == 1
+    
+    # 2. Second initialization: should load from cache and skip rescan because fingerprint matches
+    cfg2 = config_module.Config()
+    # scan_calls should still be 1 because it loaded from cache and skipped the rescan
+    assert scan_calls == 1
+
+def test_mtime_change_does_not_trigger_rescan(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)
+    
+    # Track calls to _scan_symbolic_links
+    scan_calls = 0
+    original_scan = config_module.Config._scan_symbolic_links
+    
+    def wrapped_scan(self):
+        nonlocal scan_calls
+        scan_calls += 1
+        return original_scan(self)
+    
+    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", wrapped_scan)
+    
+    # 1. First initialization: should scan and cache
+    cfg1 = config_module.Config()
+    assert scan_calls == 1
+    
+    # 2. Modify a root directory (change mtime) - this should NOT trigger a rescan anymore
+    os.utime(loras_dir, (os.path.getatime(loras_dir), os.path.getmtime(loras_dir) + 100))
+    
+    # 3. Third initialization: should load from cache and skip rescan despite mtime change
+    cfg3 = config_module.Config()
+    assert scan_calls == 1
+
+def test_root_path_change_triggers_rescan(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)
+    
+    # Track calls to _scan_symbolic_links
+    scan_calls = 0
+    original_scan = config_module.Config._scan_symbolic_links
+    
+    def wrapped_scan(self):
+        nonlocal scan_calls
+        scan_calls += 1
+        return original_scan(self)
+    
+    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", wrapped_scan)
+    
+    # 1. First initialization
+    config_module.Config()
+    assert scan_calls == 1
+    
+    # 2. Change root paths
+    new_lora_dir = tmp_path / "new_loras"
+    new_lora_dir.mkdir()
+    
+    def fake_get_folder_paths_modified(kind: str):
+        if kind == "loras":
+            return [str(loras_dir), str(new_lora_dir)]
+        return []
+    
+    monkeypatch.setattr(config_module.folder_paths, "get_folder_paths", fake_get_folder_paths_modified)
+    
+    # 3. Initialization with different roots should trigger rescan
+    config_module.Config()
+    assert scan_calls == 2
+
+def test_manual_rebuild_symlink_cache(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)
+    
+    scan_calls = 0
+    original_scan = config_module.Config._scan_symbolic_links
+    
+    def wrapped_scan(self):
+        nonlocal scan_calls
+        scan_calls += 1
+        return original_scan(self)
+    
+    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", wrapped_scan)
+    
+    cfg = config_module.Config()
+    assert scan_calls == 1
+    
+    # Manual trigger
+    cfg.rebuild_symlink_cache()
+    assert scan_calls == 2