cmd/dist: completely remove dist command

Signed-off-by: Stephen J Day <stephen.day@docker.com>

cmd/ctr/rootfs.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/containerd/containerd/log"
+	digest "github.com/opencontainers/go-digest"
+	"github.com/urfave/cli"
+)
+
+var rootfsCommand = cli.Command{
+	Name:  "rootfs",
+	Usage: "rootfs setups a rootfs",
+	Subcommands: []cli.Command{
+		rootfsUnpackCommand,
+	},
+}
+
+var rootfsUnpackCommand = cli.Command{
+	Name:      "unpack",
+	Usage:     "unpack applies layers from a manifest to a snapshot",
+	ArgsUsage: "[flags] <digest>",
+	Flags:     snapshotterFlags,
+	Action: func(clicontext *cli.Context) error {
+		ctx, cancel := appContext(clicontext)
+		defer cancel()
+
+		dgst, err := digest.Parse(clicontext.Args().First())
+		if err != nil {
+			return err
+		}
+
+		log.G(ctx).Debugf("unpacking layers from manifest %s", dgst.String())
+
+		client, err := newClient(clicontext)
+		if err != nil {
+			return err
+		}
+
+		// TODO: Support unpack by name
+
+		images, err := client.ListImages(ctx)
+		if err != nil {
+			return err
+		}
+
+		var unpacked bool
+		for _, image := range images {
+			if image.Target().Digest == dgst {
+				fmt.Printf("unpacking %s (%s)...", dgst, image.Target().MediaType)
+				if err := image.Unpack(ctx, clicontext.String("snapshotter")); err != nil {
+					fmt.Println()
+					return err
+				}
+				fmt.Println("done")
+				unpacked = true
+				break
+			}
+		}
+		if !unpacked {
+			return errors.New("manifest not found")
+		}
+
+		// TODO: Get rootfs from Image
+		//log.G(ctx).Infof("chain ID: %s", chainID.String())
+
+		return nil
+	},
+}