delete.go

// +build !solaris

package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/opencontainers/runc/libcontainer"
	"github.com/urfave/cli"

	"golang.org/x/sys/unix"
)

func killContainer(container libcontainer.Container) error {
	_ = container.Signal(unix.SIGKILL, false)
	for i := 0; i < 100; i++ {
		time.Sleep(100 * time.Millisecond)
		if err := container.Signal(unix.Signal(0), false); err != nil {
			destroy(container)
			return nil
		}
	}
	return errors.New("container init still running")
}

var deleteCommand = cli.Command{
	Name:  "delete",
	Usage: "delete any resources held by the system container; often used with detached container",
	ArgsUsage: `<container-id>

Where "<container-id>" is the name for the instance of the container.

EXAMPLE:
For example, if the container id is "ubuntu01" and sysbox-runc list currently shows the
status of "ubuntu01" as "stopped" the following will delete resources held for
"ubuntu01" removing "ubuntu01" from the sysbox-runc list of containers:

       # sysbox-runc delete ubuntu01`,
	Flags: []cli.Flag{
		cli.BoolFlag{
			Name:  "force, f",
			Usage: "Forcibly deletes the container if it is still running (uses SIGKILL)",
		},
	},
	Action: func(context *cli.Context) error {
		if err := checkArgs(context, 1, exactArgs); err != nil {
			return err
		}

		id := context.Args().First()
		force := context.Bool("force")
		container, err := getContainer(context)
		if err != nil {
			if lerr, ok := err.(libcontainer.Error); ok && lerr.Code() == libcontainer.ContainerNotExists {
				// if there was an aborted start or something of the sort then the container's directory could exist but
				// libcontainer does not see it because the state.json file inside that directory was never created.
				path := filepath.Join(context.GlobalString("root"), id)
				if e := os.RemoveAll(path); e != nil {
					fmt.Fprintf(os.Stderr, "remove %s: %v\n", path, e)
				}
				if force {
					return nil
				}
			}
			return err
		}
		s, err := container.Status()
		if err != nil {
			return err
		}
		switch s {
		case libcontainer.Stopped:
			destroy(container)
		case libcontainer.Created:
			return killContainer(container)
		default:
			if force {
				return killContainer(container)
			}
			return fmt.Errorf("cannot delete container %s that is not stopped: %s\n", id, s)
		}

		return nil
	},
}