add document state transformer interface

internal/resource/container_image.go

@@ -600,7 +600,7 @@ func (c *ContainerImage) Create(ctx context.Context) (err error) {
 			err = c.Push(ctx)
 		}
 	}
-	return nil
+	return
 }
 
 func (c *ContainerImage) Update(ctx context.Context) error {

internal/resource/container_image_test.go

@@ -149,7 +149,7 @@ func TestCreateContainerImagePush(t *testing.T) {
 
 	assert.Nil(t, stater.Trigger("create"))
 
-	c.Push(context.Background())
+	assert.Nil(t, c.Push(context.Background()))
 	assert.True(t, c.PushImage)
 	assert.Equal(t, "foo", c.Output.String())
 }

internal/resource/resource.go

@@ -137,41 +137,56 @@ func (r ResourceReference) ContentWriterStream() (*transport.Writer, error) {
 func StorageMachine(sub machine.Subscriber) machine.Stater {
 // start_destroy -> absent -> start_create -> present -> start_destroy
 	stater := machine.New("unknown")
-	stater.AddStates("unkonwn", "absent", "start_create", "present", "start_delete", "start_read", "start_update")
+	stater.AddStates("unkonwn", "absent", "start_create", "present", "start_delete", "start_read", "start_update", "start_stat")
+
 	stater.AddTransition("create", machine.States("unknown", "absent"), "start_create")
 	if e := stater.AddSubscription("create", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("created", machine.States("start_create"), "present")
 	if e := stater.AddSubscription("created", sub); e != nil {
 		return nil
 	}
-	stater.AddTransition("exists", machine.States("unknown", "absent"), "present")
+	stater.AddTransition("exists", machine.States("unknown", "absent", "start_stat"), "present")
 	if e := stater.AddSubscription("exists", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("notexists", machine.States("*"), "absent")
 	if e := stater.AddSubscription("notexists", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("read", machine.States("*"), "start_read")
 	if e := stater.AddSubscription("read", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("state_read", machine.States("start_read"), "present")
+
+	stater.AddTransition("stat", machine.States("*"), "start_stat")
+	if e := stater.AddSubscription("stat", sub); e != nil {
+		return nil
+	}
+
 	stater.AddTransition("update", machine.States("*"), "start_update")
 	if e := stater.AddSubscription("update", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("updated", machine.States("start_update"), "present")
+
 	stater.AddTransition("delete", machine.States("*"), "start_delete")
 	if e := stater.AddSubscription("delete", sub); e != nil {
 		return nil
 	}
+
 	stater.AddTransition("deleted", machine.States("start_delete"), "absent")
 	if e := stater.AddSubscription("deleted", sub); e != nil {
 		return nil
 	}
+
 	return stater
 }