Allow Default/None-OS to access plugins (#346)

(DIS-2138)

dissect/target/plugin.py

@@ -832,7 +832,8 @@ def plugin_function_index(target: Target) -> tuple[dict[str, Any], set[str]]:
 
     def all_plugins():
         # Filter out plugins based on the target os
-        os_type = type(target._os) if target._os else None
+        os_type = type(target._os) if target._os and target._os.os != "default" else None
+
         yield from plugins(os_type)
         yield from os_plugins()
         yield from child_plugins()  # Doesn't export anything but added for completeness.

tests/conftest.py

@@ -90,6 +90,12 @@ def hive_hku():
     yield hive
 
 
+@pytest.fixture
+def target_default():
+    mock_target = next(make_mock_target())
+    yield mock_target
+
+
 @pytest.fixture
 def target_win(hive_hklm, fs_win):
     mock_target = next(make_mock_target())

tests/test_plugin.py

@@ -10,6 +10,7 @@
     get_external_module_paths,
     save_plugin_import_failure,
 )
+from dissect.target.target import Target
 
 
 def test_save_plugin_import_failure():
@@ -106,15 +107,24 @@ def f6(self):
     assert len(found) == assert_num_found
 
 
-def test_find_plugin_function_windows(target_win):
+def test_find_plugin_function_windows(target_win: Target) -> None:
     found, _ = find_plugin_functions(target_win, "services")
 
     assert len(found) == 1
     assert found[0].name == "os.windows.services.services"
 
 
-def test_find_plugin_function_unix(target_unix):
+def test_find_plugin_function_unix(target_unix: Target) -> None:
     found, _ = find_plugin_functions(target_unix, "services")
 
     assert len(found) == 1
     assert found[0].name == "os.unix.services.services"
+
+
+def test_find_plugin_function_default(target_default: Target) -> None:
+    found, _ = find_plugin_functions(target_default, "services")
+
+    assert len(found) == 2
+    names = [item.name for item in found]
+    assert "os.unix.services.services" in names
+    assert "os.windows.services.services" in names