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// +build linux
package libpod
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"syscall"
"github.com/containers/podman/v2/libpod/define"
"github.com/containers/podman/v2/pkg/rootless"
"github.com/containers/podman/v2/pkg/util"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func stopPauseProcess() error {
if rootless.IsRootless() {
pausePidPath, err := util.GetRootlessPauseProcessPidPath()
if err != nil {
return errors.Wrapf(err, "could not get pause process pid file path")
}
data, err := ioutil.ReadFile(pausePidPath)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return errors.Wrap(err, "cannot read pause process pid file")
}
pausePid, err := strconv.Atoi(string(data))
if err != nil {
return errors.Wrapf(err, "cannot parse pause pid file %s", pausePidPath)
}
if err := os.Remove(pausePidPath); err != nil {
return errors.Wrapf(err, "cannot delete pause pid file %s", pausePidPath)
}
if err := syscall.Kill(pausePid, syscall.SIGKILL); err != nil {
return err
}
}
return nil
}
func (r *Runtime) migrate(ctx context.Context) error {
runningContainers, err := r.GetRunningContainers()
if err != nil {
return err
}
allCtrs, err := r.state.AllContainers()
if err != nil {
return err
}
logrus.Infof("stopping all containers")
for _, ctr := range runningContainers {
fmt.Printf("stopped %s\n", ctr.ID())
if err := ctr.Stop(); err != nil {
return errors.Wrapf(err, "cannot stop container %s", ctr.ID())
}
}
// Did the user request a new runtime?
runtimeChangeRequested := r.migrateRuntime != ""
requestedRuntime, runtimeExists := r.ociRuntimes[r.migrateRuntime]
if !runtimeExists && runtimeChangeRequested {
return errors.Wrapf(define.ErrInvalidArg, "change to runtime %q requested but no such runtime is defined", r.migrateRuntime)
}
for _, ctr := range allCtrs {
needsWrite := false
// Reset pause process location
oldLocation := filepath.Join(ctr.state.RunDir, "conmon.pid")
if ctr.config.ConmonPidFile == oldLocation {
logrus.Infof("changing conmon PID file for %s", ctr.ID())
ctr.config.ConmonPidFile = filepath.Join(ctr.config.StaticDir, "conmon.pid")
needsWrite = true
}
// Reset runtime
if runtimeChangeRequested {
logrus.Infof("Resetting container %s runtime to runtime %s", ctr.ID(), r.migrateRuntime)
ctr.config.OCIRuntime = r.migrateRuntime
ctr.ociRuntime = requestedRuntime
needsWrite = true
}
if needsWrite {
if err := r.state.RewriteContainerConfig(ctr, ctr.config); err != nil {
return errors.Wrapf(err, "error rewriting config for container %s", ctr.ID())
}
}
}
return stopPauseProcess()
}
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