Merge pull request #7905 from dcantah/ctr-ocispec-plat

cmd/ctr/commands/oci/oci.go

@@ -24,6 +24,7 @@ import (
 	"github.com/containerd/containerd/cmd/ctr/commands"
 	"github.com/containerd/containerd/containers"
 	"github.com/containerd/containerd/oci"
+	"github.com/containerd/containerd/platforms"
 )
 
 // Command is the parent for all OCI related tools under 'oci'
@@ -38,11 +39,22 @@ var Command = cli.Command{
 var defaultSpecCommand = cli.Command{
 	Name:  "spec",
 	Usage: "see the output of the default OCI spec",
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name:  "platform",
+			Usage: "platform of the spec to print (Examples: 'linux/arm64', 'windows/amd64')",
+		},
+	},
 	Action: func(context *cli.Context) error {
 		ctx, cancel := commands.AppContext(context)
 		defer cancel()
 
-		spec, err := oci.GenerateSpec(ctx, nil, &containers.Container{})
+		platform := platforms.DefaultString()
+		if plat := context.String("platform"); plat != "" {
+			platform = plat
+		}
+
+		spec, err := oci.GenerateSpecWithPlatform(ctx, nil, platform, &containers.Container{})
 		if err != nil {
 			return fmt.Errorf("failed to generate spec: %w", err)
 		}