Move "copy" to daemon/copy.go

This is part of an effort to break apart the deprecated server/ package

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

daemon/copy.go

@@ -0,0 +1,33 @@
+package daemon
+
+import (
+	"io"
+
+	"github.com/docker/docker/engine"
+)
+
+func (daemon *Daemon) ContainerCopy(job *engine.Job) engine.Status {
+	if len(job.Args) != 2 {
+		return job.Errorf("Usage: %s CONTAINER RESOURCE\n", job.Name)
+	}
+
+	var (
+		name     = job.Args[0]
+		resource = job.Args[1]
+	)
+
+	if container := daemon.Get(name); container != nil {
+
+		data, err := container.Copy(resource)
+		if err != nil {
+			return job.Error(err)
+		}
+		defer data.Close()
+
+		if _, err := io.Copy(job.Stdout, data); err != nil {
+			return job.Error(err)
+		}
+		return engine.StatusOK
+	}
+	return job.Errorf("No such container: %s", name)
+}

daemon/daemon.go

@@ -152,6 +152,9 @@ func (daemon *Daemon) Install(eng *engine.Engine) error {
 	if err := eng.Register("delete", daemon.ContainerDestroy); err != nil {
 		return err
 	}
+	if err := eng.Register("container_copy", daemon.ContainerCopy); err != nil {
+		return err
+	}
 	return nil
 }