ctr: add commands: list and inspect

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

cmd/ctr/list.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	gocontext "context"
+	"fmt"
+
+	"github.com/docker/containerd/api/execution"
+	"github.com/urfave/cli"
+)
+
+var listCommand = cli.Command{
+	Name:  "list",
+	Usage: "list containers",
+	Action: func(context *cli.Context) error {
+		executionService, err := getExecutionService(context)
+		if err != nil {
+			return err
+		}
+		listResponse, err := executionService.List(gocontext.Background(), &execution.ListContainersRequest{
+			Owner: []string{},
+		})
+		if err != nil {
+			return err
+		}
+		fmt.Printf("ID\tSTATUS\tPROCS\tBUNDLE\n")
+		for _, c := range listResponse.Containers {
+			listProcResponse, err := executionService.ListProcesses(gocontext.Background(),
+				&execution.ListProcessesRequest{ID: c.ID})
+			if err != nil {
+				return err
+			}
+			fmt.Printf("%s\t%s\t%d\t%s\n",
+				c.ID,
+				c.Status,
+				len(listProcResponse.Processes),
+				c.BundlePath,
+			)
+		}
+		return nil
+	},
+}