Added created time to pod state

Signed-off-by: haircommander <pehunt@redhat.com>

Closes: #1079
Approved by: rhatdan

libpod/pod.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/containers/storage"
 	"github.com/docker/docker/pkg/stringid"
@@ -36,6 +37,9 @@ type PodConfig struct {
 	// If true, all containers joined to the pod will use the pod cgroup as
 	// their cgroup parent, and cannot set a different cgroup parent
 	UsePodCgroup bool
+
+	// Time pod was created
+	CreatedTime time.Time `json:"created"`
 }
 
 // podState represents a pod's state
@@ -64,6 +68,11 @@ func (p *Pod) Labels() map[string]string {
 	return labels
 }
 
+// CreatedTime gets the time when the pod was created
+func (p *Pod) CreatedTime() time.Time {
+	return p.config.CreatedTime
+}
+
 // CgroupParent returns the pod's CGroup parent
 func (p *Pod) CgroupParent() string {
 	return p.config.CgroupParent
@@ -92,6 +101,7 @@ func newPod(lockDir string, runtime *Runtime) (*Pod, error) {
 	pod.config = new(PodConfig)
 	pod.config.ID = stringid.GenerateNonCryptoID()
 	pod.config.Labels = make(map[string]string)
+	pod.config.CreatedTime = time.Now()
 	pod.state = new(podState)
 	pod.runtime = runtime
 

libpod/runtime_pod.go

@@ -2,6 +2,9 @@ package libpod
 
 import (
 	"context"
+	"time"
+
+	"github.com/pkg/errors"
 )
 
 // Contains the public Runtime API for pods
@@ -93,3 +96,36 @@ func (r *Runtime) Pods(filters ...PodFilter) ([]*Pod, error) {
 
 	return podsFiltered, nil
 }
+
+// GetAllPods retrieves all pods
+func (r *Runtime) GetAllPods() ([]*Pod, error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+
+	if !r.valid {
+		return nil, ErrRuntimeStopped
+	}
+
+	return r.state.AllPods()
+}
+
+// GetLatestPod returns a pod object of the latest created pod.
+func (r *Runtime) GetLatestPod() (*Pod, error) {
+	lastCreatedIndex := -1
+	var lastCreatedTime time.Time
+	pods, err := r.GetAllPods()
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to get all pods")
+	}
+	if len(pods) == 0 {
+		return nil, ErrNoSuchPod
+	}
+	for podIndex, pod := range pods {
+		createdTime := pod.config.CreatedTime
+		if createdTime.After(lastCreatedTime) {
+			lastCreatedTime = createdTime
+			lastCreatedIndex = podIndex
+		}
+	}
+	return pods[lastCreatedIndex], nil
+}