Improve logout message for asymmetric tokens

src/cargo/util/credential/paseto.rs

@@ -200,8 +200,17 @@ impl<'a> Credential for PasetoCredential<'a> {
                 Ok(CredentialResponse::Login)
             }
             Action::Logout => {
-                config::save_credentials(self.config, None, &sid)?;
-                Ok(CredentialResponse::Logout)
+                if reg_cfg.and_then(|c| c.secret_key).is_some() {
+                    config::save_credentials(self.config, None, &sid)?;
+                    let reg_name = sid.display_registry_name();
+                    let _ = self.config.shell().status(
+                        "Logout",
+                        format!("secret-key for `{reg_name}` has been removed from local storage"),
+                    );
+                    Ok(CredentialResponse::Logout)
+                } else {
+                    Err(Error::NotFound)
+                }
             }
             _ => Err(Error::OperationNotSupported),
         }

tests/testsuite/logout.rs

@@ -102,3 +102,20 @@ fn default_registry_configured() {
         .with_stderr("[LOGOUT] not currently logged in to `dummy-registry`")
         .run();
 }
+
+#[cargo_test]
+fn logout_asymmetric() {
+    let _registry = registry::RegistryBuilder::new()
+        .token(cargo_test_support::registry::Token::rfc_key())
+        .build();
+
+    cargo_process("logout --registry crates-io -Zasymmetric-token")
+        .masquerade_as_nightly_cargo(&["asymmetric-token"])
+        .with_stderr("[LOGOUT] secret-key for `crates-io` has been removed from local storage")
+        .run();
+
+    cargo_process("logout --registry crates-io -Zasymmetric-token")
+        .masquerade_as_nightly_cargo(&["asymmetric-token"])
+        .with_stderr("[LOGOUT] not currently logged in to `crates-io`")
+        .run();
+}