containerd-shim-kata-v2: add the service Delete support

Add the Delete api support to delete a stopped
container or pod.

Signed-off-by: fupan <lifupan@gmail.com>

containerd-shim-v2/delete.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2018 HyperHQ Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package containerdshim
+
+import (
+	"context"
+	"path"
+
+	"github.com/containerd/containerd/mount"
+	"github.com/kata-containers/runtime/pkg/katautils"
+	vc "github.com/kata-containers/runtime/virtcontainers"
+	"github.com/sirupsen/logrus"
+)
+
+func deleteContainer(ctx context.Context, s *service, c *container) error {
+
+	status, err := s.sandbox.StatusContainer(c.id)
+	if err != nil {
+		return err
+	}
+	if status.State.State != vc.StateStopped {
+		_, err = s.sandbox.StopContainer(c.id)
+		if err != nil {
+			return err
+		}
+	}
+
+	_, err = s.sandbox.DeleteContainer(c.id)
+	if err != nil {
+		return err
+	}
+
+	// Run post-stop OCI hooks.
+	if err := katautils.PostStopHooks(ctx, *c.spec, s.sandbox.ID(), c.bundle); err != nil {
+		return err
+	}
+
+	rootfs := path.Join(c.bundle, "rootfs")
+	if err := mount.UnmountAll(rootfs, 0); err != nil {
+		logrus.WithError(err).Warn("failed to cleanup rootfs mount")
+	}
+
+	delete(s.containers, c.id)
+
+	return nil
+}

containerd-shim-v2/service.go

@@ -313,7 +313,39 @@ func (s *service) Start(ctx context.Context, r *taskAPI.StartRequest) (*taskAPI.
 
 // Delete the initial process and container
 func (s *service) Delete(ctx context.Context, r *taskAPI.DeleteRequest) (*taskAPI.DeleteResponse, error) {
-	return nil, errdefs.ErrNotImplemented
+	s.Lock()
+	defer s.Unlock()
+
+	c, err := s.getContainer(r.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.ExecID == "" {
+		err = deleteContainer(ctx, s, c)
+		if err != nil {
+			return nil, err
+		}
+
+		return &taskAPI.DeleteResponse{
+			ExitStatus: c.exit,
+			ExitedAt:   c.time,
+			Pid:        s.pid,
+		}, nil
+	}
+	//deal with the exec case
+	execs, err := c.getExec(r.ExecID)
+	if err != nil {
+		return nil, err
+	}
+
+	delete(c.execs, r.ExecID)
+
+	return &taskAPI.DeleteResponse{
+		ExitStatus: uint32(execs.exitCode),
+		ExitedAt:   execs.exitTime,
+		Pid:        s.pid,
+	}, nil
 }
 
 // Exec an additional process inside the container