error when running subgraph check on a federated graph

src/command/subgraph/check.rs

@@ -65,6 +65,24 @@ impl Check {
 
  let sdl = load_schema_from_flag(&self.schema, std::io::stdin())?;
 
+ // This response is used to check whether or not the current graph is federated.
+ let federated_response = is_federated::run(
+ is_federated::is_federated_graph::Variables {
+ graph_id: self.graph.name.clone(),
+ graph_variant: self.graph.variant.clone(),
+ },
+ &client,
+ )?;
+
+ // We don't want to run subgraph check on a non-federated graph, so
+ // return an error and recommend running graph check instead.
+ if !federated_response.result && !self.convert {
+ return Err(RoverError::new(anyhow!(
+ "Not able to run subgraph check on a non-federated graph."
+ )));
+ }
+
+
  let partial_schema = check::check_partial_schema_query::PartialSchemaInput {
  sdl: Some(sdl),
  // we never need to send the hash since the back end computes it from SDL