cmd/dist: completely remove dist command

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

cmd/ctr/fetchobject.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"io"
+	"os"
+
+	"github.com/containerd/containerd/log"
+	"github.com/urfave/cli"
+)
+
+// TODO(stevvooe): Create "multi-fetch" mode that just takes a remote
+// then receives object/hint lines on stdin, returning content as
+// needed.
+
+var fetchObjectCommand = cli.Command{
+	Name:        "fetch-object",
+	Usage:       "retrieve objects from a remote",
+	ArgsUsage:   "[flags] <remote> <object> [<hint>, ...]",
+	Description: `Fetch objects by identifier from a remote.`,
+	Flags:       registryFlags,
+	Action: func(context *cli.Context) error {
+		var (
+			ref = context.Args().First()
+		)
+		ctx, cancel := appContext(context)
+		defer cancel()
+
+		resolver, err := getResolver(ctx, context)
+		if err != nil {
+			return err
+		}
+
+		ctx = log.WithLogger(ctx, log.G(ctx).WithField("ref", ref))
+
+		log.G(ctx).Infof("resolving")
+		name, desc, err := resolver.Resolve(ctx, ref)
+		if err != nil {
+			return err
+		}
+		fetcher, err := resolver.Fetcher(ctx, name)
+		if err != nil {
+			return err
+		}
+
+		log.G(ctx).Infof("fetching")
+		rc, err := fetcher.Fetch(ctx, desc)
+		if err != nil {
+			return err
+		}
+		defer rc.Close()
+
+		_, err = io.Copy(os.Stdout, rc)
+		return err
+	},
+}