plancontext: use helpers to determine if CUE value is secret/fs/service

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

plancontext/service.go

@@ -16,6 +16,10 @@ var (
 	)
 )
 
+func IsServiceValue(v *compiler.Value) bool {
+	return v.LookupPath(serviceIDPath).Exists()
+}
+
 type Service struct {
 	id string
 
@@ -62,10 +66,6 @@ func (c *serviceContext) New(unix, npipe string) *Service {
 	return s
 }
 
-func (c *serviceContext) Contains(v *compiler.Value) bool {
-	return v.LookupPath(serviceIDPath).Exists()
-}
-
 func (c *serviceContext) FromValue(v *compiler.Value) (*Service, error) {
 	c.l.RLock()
 	defer c.l.RUnlock()