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state_linux.go
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state_linux.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2014 Docker, Inc.
// Copyright 2023 Unikraft GmbH and The KraftKit Authors
package libmocktainer
import (
"fmt"
"os"
"github.com/opencontainers/runtime-spec/specs-go"
"golang.org/x/sys/unix"
"kraftkit.sh/libmocktainer/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 *Container) error {
var err error
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 *Container) error {
hooks := c.config.Hooks
if hooks == nil {
return nil
}
s, err := c.currentOCIState()
if err != nil {
return err
}
s.Status = specs.StateStopped
if err := hooks[configs.Poststop].RunHooks(s); err != nil {
return err
}
return nil
}
// stoppedState represents a container is a stopped/destroyed state.
type stoppedState struct {
c *Container
}
func (*stoppedState) status() Status {
return Stopped
}
func (b *stoppedState) transition(s containerState) error {
switch s.(type) {
case *runningState:
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 *Container
}
func (r *runningState) status() Status {
return Running
}
func (r *runningState) transition(s containerState) error {
switch s.(type) {
case *stoppedState:
if r.c.runType() == Running {
return ErrRunning
}
r.c.state = s
return nil
case *runningState:
return nil
}
return newStateTransitionError(r, s)
}
func (r *runningState) destroy() error {
if r.c.runType() == Running {
return ErrRunning
}
return destroy(r.c)
}
type createdState struct {
c *Container
}
func (i *createdState) status() Status {
return Created
}
func (i *createdState) transition(s containerState) error {
switch s.(type) {
case *runningState, *stoppedState:
i.c.state = s
return nil
case *createdState:
return nil
}
return newStateTransitionError(i, s)
}
func (i *createdState) destroy() error {
_ = i.c.initProcess.signal(unix.SIGKILL)
return destroy(i.c)
}
// loadedState is used whenever a container is restored, loaded, or setting additional
// processes inside and it should not be destroyed when it is exiting.
type loadedState struct {
c *Container
s Status
}
func (n *loadedState) status() Status {
return n.s
}
func (n *loadedState) transition(s containerState) error {
n.c.state = s
return nil
}
func (n *loadedState) destroy() error {
if err := n.c.refreshState(); err != nil {
return err
}
return n.c.state.destroy()
}