password_manager: do not try to use keyring when disabled ("null" keyring) (#5251)

* when disabled, keyring uses a "null" keyring
* Fix the mock for the chainer tests

src/poetry/utils/password_manager.py

@@ -94,7 +94,7 @@ class KeyRing:
 
 
         backend = keyring.get_keyring()
         backend = keyring.get_keyring()
         name = backend.name.split(" ")[0]
         name = backend.name.split(" ")[0]
-        if name == "fail":
+        if name in ("fail", "null"):
             logger.debug("No suitable keyring backend found")
             logger.debug("No suitable keyring backend found")
             self._is_available = False
             self._is_available = False
         elif "plaintext" in backend.name.lower():
         elif "plaintext" in backend.name.lower():
@@ -107,7 +107,7 @@ class KeyRing:
                 backends = keyring.backend.get_all_keyring()
                 backends = keyring.backend.get_all_keyring()
 
 
                 self._is_available = any(
                 self._is_available = any(
-                    b.name.split(" ")[0] not in ["chainer", "fail"]
+                    b.name.split(" ")[0] not in ["chainer", "fail", "null"]
                     and "plaintext" not in b.name.lower()
                     and "plaintext" not in b.name.lower()
                     for b in backends
                     for b in backends
                 )
                 )

tests/conftest.py

@@ -116,10 +116,31 @@ def with_fail_keyring() -> None:
 
 
 
 
 @pytest.fixture()
 @pytest.fixture()
-def with_chained_keyring(mocker: MockerFixture) -> None:
+def with_null_keyring() -> None:
+    import keyring
+
+    from keyring.backends.null import Keyring
+
+    keyring.set_keyring(Keyring())
+
+
+@pytest.fixture()
+def with_chained_fail_keyring(mocker: MockerFixture) -> None:
     from keyring.backends.fail import Keyring
     from keyring.backends.fail import Keyring
 
 
-    mocker.patch("keyring.backend.get_all_keyring", [Keyring()])
+    mocker.patch("keyring.backend.get_all_keyring", lambda: [Keyring()])
+    import keyring
+
+    from keyring.backends.chainer import ChainerBackend
+
+    keyring.set_keyring(ChainerBackend())
+
+
+@pytest.fixture()
+def with_chained_null_keyring(mocker: MockerFixture) -> None:
+    from keyring.backends.null import Keyring
+
+    mocker.patch("keyring.backend.get_all_keyring", lambda: [Keyring()])
     import keyring
     import keyring
 
 
     from keyring.backends.chainer import ChainerBackend
     from keyring.backends.chainer import ChainerBackend

tests/utils/test_password_manager.py

@@ -187,8 +187,32 @@ def test_keyring_raises_errors_on_keyring_errors(
         key_ring.delete_password("foo", "bar")
         key_ring.delete_password("foo", "bar")
 
 
 
 
-def test_keyring_with_chainer_backend_and_not_compatible_only_should_be_unavailable(
-    with_chained_keyring: None,
+def test_keyring_with_chainer_backend_and_fail_keyring_should_be_unavailable(
+    with_chained_fail_keyring: None,
+):
+    key_ring = KeyRing("poetry")
+
+    assert not key_ring.is_available()
+
+
+def test_keyring_with_chainer_backend_and_null_keyring_should_be_unavailable(
+    with_chained_null_keyring: None,
+):
+    key_ring = KeyRing("poetry")
+
+    assert not key_ring.is_available()
+
+
+def test_null_keyring_should_be_unavailable(
+    with_null_keyring: None,
+):
+    key_ring = KeyRing("poetry")
+
+    assert not key_ring.is_available()
+
+
+def test_fail_keyring_should_be_unavailable(
+    with_fail_keyring: None,
 ):
 ):
     key_ring = KeyRing("poetry")
     key_ring = KeyRing("poetry")