Implement kpod rm

Kpod rm removes a container from the system

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Signed-off-by: umohnani8 <umohnani@redhat.com>

cmd/kpod/main.go

@@ -32,6 +32,7 @@ func main() {
 		pullCommand,
 		pushCommand,
 		renameCommand,
+		rmCommand,
 		rmiCommand,
 		saveCommand,
 		statsCommand,

cmd/kpod/rm.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/kubernetes-incubator/cri-o/libkpod"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+)
+
+var (
+	rmFlags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "force, f",
+			Usage: "Force removal of a running container.  The default is false",
+		},
+	}
+	rmDescription = "Remove one or more containers"
+	rmCommand     = cli.Command{
+		Name: "rm",
+		Usage: fmt.Sprintf(`kpod rm will remove one or more containers from the host.  The container name or ID can be used.
+							This does not remove images.  Running containers will not be removed without the -f option.`),
+		Description: rmDescription,
+		Flags:       rmFlags,
+		Action:      rmCmd,
+		ArgsUsage:   "",
+	}
+)
+
+// saveCmd saves the image to either docker-archive or oci
+func rmCmd(c *cli.Context) error {
+	args := c.Args()
+	if len(args) == 0 {
+		return errors.Errorf("specify one or more containers to remove")
+	}
+
+	config, err := getConfig(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get config")
+	}
+	server, err := libkpod.New(config)
+	if err != nil {
+		return errors.Wrapf(err, "could not get container server")
+	}
+	defer server.Shutdown()
+	err = server.Update()
+	if err != nil {
+		return errors.Wrapf(err, "could not update list of containers")
+	}
+	force := c.Bool("force")
+
+	for _, container := range c.Args() {
+		id, err2 := server.Remove(container, force)
+		if err2 != nil {
+			if err == nil {
+				err = err2
+			} else {
+				err = errors.Wrapf(err, "%v.  Stop the container before attempting removal or use -f\n", err2)
+			}
+		} else {
+			fmt.Println(id)
+		}
+	}
+	return err
+}