error when a non-federated graph is about to be overwritten by a subgraph

Author: lrlna

crates/rover-client/src/query/config/is_federated.graphql

@@ -0,0 +1,7 @@
+query IsFederatedGraph($graphId: ID!, $graphVariant: String!) {
+  service(id: $graphId) {
+    implementingServices(graphVariant: $graphVariant) {
+      __typename
+    }
+  }
+}

crates/rover-client/src/query/config/is_federated.rs

@@ -0,0 +1,49 @@
+// PublishPartialSchemaMutation
+use crate::blocking::StudioClient;
+use crate::RoverClientError;
+use graphql_client::*;
+
+#[derive(GraphQLQuery)]
+// The paths are relative to the directory where your `Cargo.toml` is located.
+// Both json and the GraphQL schema language are supported as sources for the schema
+#[graphql(
+    query_path = "src/query/config/is_federated.graphql",
+    schema_path = ".schema/schema.graphql",
+    response_derives = "PartialEq, Debug, Serialize, Deserialize",
+    deprecated = "warn"
+)]
+/// This struct is used to generate the module containing `Variables` and
+/// `ResponseData` structs.
+/// Snake case of this name is the mod name. i.e. publish_partial_schema_mutation
+pub struct IsFederatedGraph;
+
+#[derive(Debug, PartialEq)]
+pub struct IsFederatedGraphResponse {
+    pub result: bool,
+}
+
+pub fn run(
+    variables: is_federated_graph::Variables,
+    client: &StudioClient,
+) -> Result<IsFederatedGraphResponse, RoverClientError> {
+    let data = client.post::<IsFederatedGraph>(variables)?;
+    let is_federated_response = data.service.unwrap();
+    Ok(build_response(is_federated_response))
+}
+
+type FederatedResponse = is_federated_graph::IsFederatedGraphService;
+type ImplementingServices = is_federated_graph::IsFederatedGraphServiceImplementingServices;
+
+fn build_response(service: FederatedResponse) -> IsFederatedGraphResponse {
+    match service.implementing_services {
+        Some(typename) => match typename {
+            ImplementingServices::FederatedImplementingServices => {
+                IsFederatedGraphResponse { result: true }
+            }
+            ImplementingServices::NonFederatedImplementingService => {
+                IsFederatedGraphResponse { result: false }
+            }
+        },
+        None => IsFederatedGraphResponse { result: false },
+    }
+}

crates/rover-client/src/query/config/mod.rs

@@ -1,2 +1,5 @@
 /// runner for rover config whoami
 pub mod whoami;
+
+/// runner is_federated check
+pub mod is_federated;

installers/npm/package-lock.json

@@ -33,6 +33,6 @@
     "console.table": "^0.10.0"
   },
   "devDependencies": {
-    "prettier": "^2.2.1"
+    "prettier": "^2.3.0"
   }
 }