Backport GenerateResourceConfig fix to v1.14 (#37896)

* marshal state and set in the proto req for generate resource config

* set state in the proto req for generate resource config in plugin6

* add GRPC tests for GenerateResourceConfig

* changelog

.changes/v1.14/BUG FIXES-20251114-090620.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: Set state information in the proto request for the `GenerateResourceConfig` RPC
+time: 2025-11-14T09:06:20.057751+01:00
+custom:
+    Issue: "37896"

internal/plugin/grpc_provider.go

@@ -940,9 +940,15 @@ func (p *GRPCProvider) GenerateResourceConfig(r providers.GenerateResourceConfig
 		return resp
 	}
 
+	mp, err := msgpack.Marshal(r.State, resSchema.Body.ImpliedType())
+	if err != nil {
+		resp.Diagnostics = resp.Diagnostics.Append(err)
+		return resp
+	}
+
 	protoReq := &proto.GenerateResourceConfig_Request{
 		TypeName: r.TypeName,
-		State:    nil,
+		State:    &proto.DynamicValue{Msgpack: mp},
 	}
 
 	protoResp, err := p.client.GenerateResourceConfig(p.ctx, protoReq)

internal/plugin/grpc_provider_test.go

@@ -2102,3 +2102,36 @@ func TestGRPCProvider_ListResource_Limit(t *testing.T) {
 		t.Fatalf("Expected 2 events, got %d", len(results))
 	}
 }
+
+func TestGRPCProvider_GenerateResourceConfig(t *testing.T) {
+	client := mockProviderClient(t)
+	p := &GRPCProvider{
+		client: client,
+	}
+	client.EXPECT().GenerateResourceConfig(
+		gomock.Any(),
+		gomock.Cond[any](func(x any) bool {
+			req := x.(*proto.GenerateResourceConfig_Request)
+			if req.TypeName != "resource" {
+				return false
+			}
+			if req.State == nil {
+				t.Log("GenerateResourceConfig state is nil")
+				return false
+			}
+			return true
+		}),
+	).Return(&proto.GenerateResourceConfig_Response{
+		Config: &proto.DynamicValue{
+			Msgpack: []byte("\x81\xa4attr\xa3bar"),
+		},
+	}, nil)
+	resp := p.GenerateResourceConfig(providers.GenerateResourceConfigRequest{
+		TypeName: "resource",
+		State: cty.ObjectVal(map[string]cty.Value{
+			"computed": cty.StringVal("computed"),
+			"attr":     cty.StringVal("foo"),
+		}),
+	})
+	checkDiags(t, resp.Diagnostics)
+}

internal/plugin6/grpc_provider.go

@@ -934,9 +934,15 @@ func (p *GRPCProvider) GenerateResourceConfig(r providers.GenerateResourceConfig
 		return resp
 	}
 
+	mp, err := msgpack.Marshal(r.State, resSchema.Body.ImpliedType())
+	if err != nil {
+		resp.Diagnostics = resp.Diagnostics.Append(err)
+		return resp
+	}
+
 	protoReq := &proto6.GenerateResourceConfig_Request{
 		TypeName: r.TypeName,
-		State:    nil,
+		State:    &proto6.DynamicValue{Msgpack: mp},
 	}
 
 	protoResp, err := p.client.GenerateResourceConfig(p.ctx, protoReq)

internal/plugin6/grpc_provider_test.go

@@ -2556,3 +2556,36 @@ func TestGRPCProvider_DeleteState(t *testing.T) {
 		}
 	})
 }
+
+func TestGRPCProvider_GenerateResourceConfig(t *testing.T) {
+	client := mockProviderClient(t)
+	p := &GRPCProvider{
+		client: client,
+	}
+	client.EXPECT().GenerateResourceConfig(
+		gomock.Any(),
+		gomock.Cond[any](func(x any) bool {
+			req := x.(*proto.GenerateResourceConfig_Request)
+			if req.TypeName != "resource" {
+				return false
+			}
+			if req.State == nil {
+				t.Log("GenerateResourceConfig state is nil")
+				return false
+			}
+			return true
+		}),
+	).Return(&proto.GenerateResourceConfig_Response{
+		Config: &proto.DynamicValue{
+			Msgpack: []byte("\x81\xa4attr\xa3bar"),
+		},
+	}, nil)
+	resp := p.GenerateResourceConfig(providers.GenerateResourceConfigRequest{
+		TypeName: "resource",
+		State: cty.ObjectVal(map[string]cty.Value{
+			"computed": cty.StringVal("computed"),
+			"attr":     cty.StringVal("foo"),
+		}),
+	})
+	checkDiags(t, resp.Diagnostics)
+}