config: store the runtime used to create each container

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

libpod/container.go

@@ -350,6 +350,9 @@ type ContainerConfig struct {
 
 	PostConfigureNetNS bool `json:"postConfigureNetNS"`
 
+	// OCIRuntime used to create the container
+	OCIRuntime string `json:"runtime,omitempty"`
+
 	// ExitCommand is the container's exit command.
 	// This Command will be executed when the container exits
 	ExitCommand []string `json:"exitCommand,omitempty"`

libpod/runtime_ctr.go

@@ -62,6 +62,8 @@ func (r *Runtime) newContainer(ctx context.Context, rSpec *spec.Spec, options ..
 
 	ctr.config.StopTimeout = CtrRemoveTimeout
 
+	ctr.config.OCIRuntime = r.config.OCIRuntime
+
 	// Set namespace based on current runtime namespace
 	// Do so before options run so they can override it
 	if r.config.Namespace != "" {