Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/state_linux.go

@@ -0,0 +1,226 @@
+// +build linux
+
+package libcontainer
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+func newStateTransitionError(from, to containerState) error {
+	return &stateTransitionError{
+		From: from.status().String(),
+		To:   to.status().String(),
+	}
+}
+
+// stateTransitionError is returned when an invalid state transition happens from one
+// state to another.
+type stateTransitionError struct {
+	From string
+	To   string
+}
+
+func (s *stateTransitionError) Error() string {
+	return fmt.Sprintf("invalid state transition from %s to %s", s.From, s.To)
+}
+
+type containerState interface {
+	transition(containerState) error
+	destroy() error
+	status() Status
+}
+
+func destroy(c *linuxContainer) error {
+	if !c.config.Namespaces.Contains(configs.NEWPID) {
+		if err := killCgroupProcesses(c.cgroupManager); err != nil {
+			logrus.Warn(err)
+		}
+	}
+	err := c.cgroupManager.Destroy()
+	if rerr := os.RemoveAll(c.root); err == nil {
+		err = rerr
+	}
+	c.initProcess = nil
+	if herr := runPoststopHooks(c); err == nil {
+		err = herr
+	}
+	c.state = &stoppedState{c: c}
+	return err
+}
+
+func runPoststopHooks(c *linuxContainer) error {
+	if c.config.Hooks != nil {
+		s := configs.HookState{
+			Version: c.config.Version,
+			ID:      c.id,
+			Root:    c.config.Rootfs,
+		}
+		for _, hook := range c.config.Hooks.Poststop {
+			if err := hook.Run(s); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// stoppedState represents a container is a stopped/destroyed state.
+type stoppedState struct {
+	c *linuxContainer
+}
+
+func (b *stoppedState) status() Status {
+	return Destroyed
+}
+
+func (b *stoppedState) transition(s containerState) error {
+	switch s.(type) {
+	case *runningState:
+		b.c.state = s
+		return nil
+	case *restoredState:
+		b.c.state = s
+		return nil
+	case *stoppedState:
+		return nil
+	}
+	return newStateTransitionError(b, s)
+}
+
+func (b *stoppedState) destroy() error {
+	return destroy(b.c)
+}
+
+// runningState represents a container that is currently running.
+type runningState struct {
+	c *linuxContainer
+}
+
+func (r *runningState) status() Status {
+	return Running
+}
+
+func (r *runningState) transition(s containerState) error {
+	switch s.(type) {
+	case *stoppedState:
+		running, err := r.c.isRunning()
+		if err != nil {
+			return err
+		}
+		if running {
+			return newGenericError(fmt.Errorf("container still running"), ContainerNotStopped)
+		}
+		r.c.state = s
+		return nil
+	case *pausedState:
+		r.c.state = s
+		return nil
+	case *runningState:
+		return nil
+	}
+	return newStateTransitionError(r, s)
+}
+
+func (r *runningState) destroy() error {
+	running, err := r.c.isRunning()
+	if err != nil {
+		return err
+	}
+	if running {
+		return newGenericError(fmt.Errorf("container is not destroyed"), ContainerNotStopped)
+	}
+	return destroy(r.c)
+}
+
+// pausedState represents a container that is currently pause.  It cannot be destroyed in a
+// paused state and must transition back to running first.
+type pausedState struct {
+	c *linuxContainer
+}
+
+func (p *pausedState) status() Status {
+	return Paused
+}
+
+func (p *pausedState) transition(s containerState) error {
+	switch s.(type) {
+	case *runningState, *stoppedState:
+		p.c.state = s
+		return nil
+	case *pausedState:
+		return nil
+	}
+	return newStateTransitionError(p, s)
+}
+
+func (p *pausedState) destroy() error {
+	isRunning, err := p.c.isRunning()
+	if err != nil {
+		return err
+	}
+	if !isRunning {
+		if err := p.c.cgroupManager.Freeze(configs.Thawed); err != nil {
+			return err
+		}
+		return destroy(p.c)
+	}
+	return newGenericError(fmt.Errorf("container is paused"), ContainerPaused)
+}
+
+// restoredState is the same as the running state but also has accociated checkpoint
+// information that maybe need destroyed when the container is stopped and destory is called.
+type restoredState struct {
+	imageDir string
+	c        *linuxContainer
+}
+
+func (r *restoredState) status() Status {
+	return Running
+}
+
+func (r *restoredState) transition(s containerState) error {
+	switch s.(type) {
+	case *stoppedState:
+		return nil
+	case *runningState:
+		return nil
+	}
+	return newStateTransitionError(r, s)
+}
+
+func (r *restoredState) destroy() error {
+	if _, err := os.Stat(filepath.Join(r.c.root, "checkpoint")); err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+	}
+	return destroy(r.c)
+}
+
+// createdState is used whenever a container is restored, loaded, or setting additional
+// processes inside and it should not be destroyed when it is exiting.
+type createdState struct {
+	c *linuxContainer
+	s Status
+}
+
+func (n *createdState) status() Status {
+	return n.s
+}
+
+func (n *createdState) transition(s containerState) error {
+	n.c.state = s
+	return nil
+}
+
+func (n *createdState) destroy() error {
+	if err := n.c.refreshState(); err != nil {
+		return err
+	}
+	return n.c.state.destroy()
+}