Handle some error cases during uninstall purge.

Fixes #288

Author: zooba

src/manage/pep514utils.py

@@ -224,18 +224,20 @@ def _is_tag_managed(company_key, tag_name, *, creating=False, allow_warn=True):
 def _split_root(root_name):
     if not root_name:
         LOGGER.verbose("Skipping registry shortcuts as PEP 514 registry root is not set.")
-        return
+        return None, None
     hive_name, _, name = root_name.partition("\\")
     try:
         hive = getattr(winreg, hive_name.upper())
     except AttributeError:
-        LOGGER.verbose("Skipping registry shortcuts as %s\\%s is not a valid key", root_name)
-        return
+        LOGGER.verbose("Skipping registry shortcuts as %s\\%s is not a valid key", root_name, hive_name)
+        return None, None
     return hive, name
 
 
 def update_registry(root_name, install, data, warn_for=[]):
     hive, name = _split_root(root_name)
+    if not hive or not name:
+        return
     with winreg.CreateKey(hive, name) as root:
         allow_warn = install_matches_any(install, warn_for)
         if _is_tag_managed(root, data["Key"], creating=True, allow_warn=allow_warn):
@@ -258,6 +260,8 @@ def update_registry(root_name, install, data, warn_for=[]):
 def cleanup_registry(root_name, keep, warn_for=[]):
     LOGGER.debug("Cleaning up registry entries")
     hive, name = _split_root(root_name)
+    if not hive or not name:
+        return
     with _reg_open(hive, name, writable=True) as root:
         for company_name in list(_iter_keys(root)):
             any_left = False

src/manage/uninstall_command.py

@@ -106,7 +106,8 @@ def execute(cmd):
         _do_purge_global_dir(cmd.global_dir, warn_msg.format("global commands"))
         LOGGER.info("Purging all shortcuts")
         for _, cleanup in SHORTCUT_HANDLERS.values():
-            cleanup(cmd, [])
+            if cleanup:
+                cleanup(cmd, [])
         LOGGER.debug("END uninstall_command.execute")
         return
 

tests/conftest.py

@@ -148,10 +148,16 @@ def localserver():
                 p.wait(5)
 
 
+REG_TEST_ROOT = r"Software\Python\PyManagerTesting"
+
+
 class FakeConfig:
     def __init__(self, global_dir, installs=[]):
-        self.root = global_dir.parent if global_dir else None
         self.global_dir = global_dir
+        self.root = global_dir.parent if global_dir else None
+        self.download_dir = self.root / "_cache" if self.root else None
+        self.start_folder = self.root / "_start" if self.root else None
+        self.pep514_root = REG_TEST_ROOT
         self.confirm = False
         self.installs = list(installs)
         self.shebang_can_run_anything = True
@@ -175,15 +181,14 @@ def get_install_to_run(self, tag, *, windowed=False):
         return [i for i in self.installs
                 if (not tag or i["tag"] == tag) and (not company or i["company"] == company)][0]
 
+    def ask_yn(self, question):
+        return False if self.confirm else True
 
 @pytest.fixture
 def fake_config(tmp_path):
     return FakeConfig(tmp_path / "bin")
 
 
-REG_TEST_ROOT = r"Software\Python\PyManagerTesting"
-
-
 class RegistryFixture:
     def __init__(self, hive, root):
         self.hive = hive

tests/test_uninstall_command.py

@@ -17,3 +17,11 @@ def test_purge_global_dir(monkeypatch, registry, tmp_path):
     assert registry.getvalueandkind("", "Path") == (
         rf"C:\A;{tmp_path}\X;C:\B;%PTH%;C:\%D%\E", winreg.REG_SZ)
     assert not list(tmp_path.iterdir())
+
+
+def test_null_purge(fake_config):
+    cmd = fake_config
+    cmd.args = ["--purge"]
+    cmd.confirm = False
+    cmd.purge = True
+    UC.execute(cmd)