ctr: add commands: list and inspect

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

cmd/ctr/inspect.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	gocontext "context"
+	"fmt"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/docker/containerd/api/execution"
+	"github.com/urfave/cli"
+)
+
+var inspectCommand = cli.Command{
+	Name:  "inspect",
+	Usage: "inspect a container",
+	Action: func(context *cli.Context) error {
+		executionService, err := getExecutionService(context)
+		if err != nil {
+			return err
+		}
+		id := context.Args().First()
+		if id == "" {
+			return fmt.Errorf("container id must be provided")
+		}
+		getResponse, err := executionService.Get(gocontext.Background(),
+			&execution.GetContainerRequest{ID: id})
+		if err != nil {
+			return err
+		}
+		listProcResponse, err := executionService.ListProcesses(gocontext.Background(),
+			&execution.ListProcessesRequest{ID: id})
+		if err != nil {
+			return err
+		}
+		dumper := spew.NewDefaultConfig()
+		dumper.Indent = "\t"
+		dumper.DisableMethods = true
+		dumper.DisablePointerAddresses = true
+		dumper.Dump(getResponse, listProcResponse)
+		return nil
+	},
+}