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package libpod
import (
"fmt"
"path/filepath"
"time"
"github.com/containers/storage/pkg/stringid"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// Creates a new, empty pod
func newPod(runtime *Runtime) (*Pod, error) {
pod := new(Pod)
pod.config = new(PodConfig)
pod.config.ID = stringid.GenerateNonCryptoID()
pod.config.Labels = make(map[string]string)
pod.config.CreatedTime = time.Now()
pod.config.InfraContainer = new(InfraContainerConfig)
pod.state = new(podState)
pod.runtime = runtime
return pod, nil
}
// Update pod state from database
func (p *Pod) updatePod() error {
if err := p.runtime.state.UpdatePod(p); err != nil {
return err
}
return nil
}
// Save pod state to database
func (p *Pod) save() error {
if err := p.runtime.state.SavePod(p); err != nil {
return errors.Wrapf(err, "error saving pod %s state", p.ID())
}
return nil
}
// Refresh a pod's state after restart
// This cannot lock any other pod, but may lock individual containers, as those
// will have refreshed by the time pod refresh runs.
func (p *Pod) refresh() error {
// Need to to an update from the DB to pull potentially-missing state
if err := p.runtime.state.UpdatePod(p); err != nil {
return err
}
if !p.valid {
return ErrPodRemoved
}
// Retrieve the pod's lock
lock, err := p.runtime.lockManager.RetrieveLock(p.config.LockID)
if err != nil {
return errors.Wrapf(err, "error retrieving lock for pod %s", p.ID())
}
p.lock = lock
// We need to recreate the pod's cgroup
if p.config.UsePodCgroup {
switch p.runtime.config.CgroupManager {
case SystemdCgroupsManager:
cgroupPath, err := systemdSliceFromPath(p.config.CgroupParent, fmt.Sprintf("libpod_pod_%s", p.ID()))
if err != nil {
logrus.Errorf("Error creating CGroup for pod %s: %v", p.ID(), err)
}
p.state.CgroupPath = cgroupPath
case CgroupfsCgroupsManager:
p.state.CgroupPath = filepath.Join(p.config.CgroupParent, p.ID())
logrus.Debugf("setting pod cgroup to %s", p.state.CgroupPath)
default:
return errors.Wrapf(ErrInvalidArg, "unknown cgroups manager %s specified", p.runtime.config.CgroupManager)
}
}
// Save changes
return p.save()
}
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