PyAPI: Skip user scripts w/ factory-startup

Adds bpy.app.factory_startup,
used to check if user scripts should be loaded.

release/scripts/modules/bpy/utils/__init__.py

@@ -72,6 +72,7 @@ import addon_utils as _addon_utils
 
 _user_preferences = _bpy.context.user_preferences
 _script_module_dirs = "startup", "modules"
+_is_factory_startup = _bpy.app.factory_startup
 
 
 def _test_import(module_name, loaded_modules):
@@ -145,6 +146,7 @@ def load_scripts(reload_scripts=False, refresh_scripts=False):
     :type refresh_scripts: bool
     """
     use_time = use_class_register_check = _bpy.app.debug_python
+    use_user = not _is_factory_startup
 
     if use_time:
         import time
@@ -235,7 +237,7 @@ def load_scripts(reload_scripts=False, refresh_scripts=False):
     from bpy_restrict_state import RestrictBlend
 
     with RestrictBlend():
-        for base_path in script_paths():
+        for base_path in script_paths(use_user=use_user):
             for path_subdir in _script_module_dirs:
                 path = _os.path.join(base_path, path_subdir)
                 if _os.path.isdir(path):
@@ -307,7 +309,7 @@ def script_path_pref():
     return _os.path.normpath(path) if path else None
 
 
-def script_paths(subdir=None, user_pref=True, check_all=False):
+def script_paths(subdir=None, user_pref=True, check_all=False, use_user=True):
     """
     Returns a list of valid script paths.
 
@@ -331,13 +333,24 @@ def script_paths(subdir=None, user_pref=True, check_all=False):
 
     if check_all:
         # All possible paths, no duplicates, keep order.
-        base_paths = (
-            *(path for path in (_os.path.join(resource_path(res), "scripts")
-              for res in ('LOCAL', 'USER', 'SYSTEM')) if path not in base_paths),
-            *base_paths,
-            )
+        if use_user:
+            test_paths = ('LOCAL', 'USER', 'SYSTEM')
+        else:
+            test_paths = ('LOCAL', 'SYSTEM')
 
-    for path in (*base_paths, script_path_user(), script_path_pref()):
+        base_paths = (
+            *(path for path in (
+                _os.path.join(resource_path(res), "scripts")
+                for res in test_paths) if path not in base_paths),
+            *base_paths,
+        )
+
+    if use_user:
+        test_paths = (*base_paths, script_path_user(), script_path_pref())
+    else:
+        test_paths = (*base_paths, script_path_pref())
+
+    for path in test_paths:
         if path:
             path = _os.path.normpath(path)
             if path not in scripts and _os.path.isdir(path):

source/blender/python/intern/bpy_app.c

@@ -89,6 +89,7 @@ static PyStructSequence_Field app_info_fields[] = {
 	{(char *)"version_cycle", (char *)"The release status of this build alpha/beta/rc/release"},
 	{(char *)"binary_path", (char *)"The location of blenders executable, useful for utilities that spawn new instances"},
 	{(char *)"background", (char *)"Boolean, True when blender is running without a user interface (started with -b)"},
+	{(char *)"factory_startup", (char *)"Boolean, True when blender is running with --factory-startup)"},
 
 	/* buildinfo */
 	{(char *)"build_date", (char *)"The date this blender instance was built"},
@@ -165,6 +166,7 @@ static PyObject *make_app_info(void)
 	SetStrItem(STRINGIFY(BLENDER_VERSION_CYCLE));
 	SetStrItem(BKE_appdir_program_path());
 	SetObjItem(PyBool_FromLong(G.background));
+	SetObjItem(PyBool_FromLong(G.factory_startup));
 
 	/* build info, use bytes since we can't assume _any_ encoding:
 	 * see patch [#30154] for issue */