Handle ps container created field as a time.Time

In the current code we were translating the created time
from a time.Time to a unix epoch, this was leading to a loss
of precession, and some unexpected results where the sorting
order of containers was misordered because of the precession loss.

If we pass around created as time.Time, we do not loose the precission.

Fixes: https://github.com/containers/podman/issues/8414

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

cmd/podman/containers/ps.go

@@ -126,7 +126,7 @@ func checkFlags(c *cobra.Command) error {
 func jsonOut(responses []entities.ListContainer) error {
 	r := make([]entities.ListContainer, 0)
 	for _, con := range responses {
-		con.CreatedAt = units.HumanDuration(time.Since(time.Unix(con.Created, 0))) + " ago"
+		con.CreatedAt = units.HumanDuration(time.Since(con.Created)) + " ago"
 		con.Status = psReporter{con}.Status()
 		r = append(r, con)
 	}
@@ -386,12 +386,12 @@ func (l psReporter) Ports() string {
 // CreatedAt returns the container creation time in string format.  podman
 // and docker both return a timestamped value for createdat
 func (l psReporter) CreatedAt() string {
-	return time.Unix(l.Created, 0).String()
+	return l.Created.String()
 }
 
 // CreateHuman allows us to output the created time in human readable format
 func (l psReporter) CreatedHuman() string {
-	return units.HumanDuration(time.Since(time.Unix(l.Created, 0))) + " ago"
+	return units.HumanDuration(time.Since(l.Created)) + " ago"
 }
 
 // Cgroup exposes .Namespaces.Cgroup

pkg/domain/entities/container_ps.go

@@ -3,6 +3,7 @@ package entities
 import (
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/containers/podman/v2/pkg/ps/define"
 	"github.com/cri-o/ocicni/pkg/ocicni"
@@ -14,7 +15,7 @@ type ListContainer struct {
 	// Container command
 	Command []string
 	// Container creation time
-	Created int64
+	Created time.Time
 	// Human readable container creation time.
 	CreatedAt string
 	// If container has exited/stopped
@@ -137,7 +138,7 @@ func (a psSortedSize) Less(i, j int) bool {
 type PsSortedCreateTime struct{ SortListContainers }
 
 func (a PsSortedCreateTime) Less(i, j int) bool {
-	return a.SortListContainers[i].Created < a.SortListContainers[j].Created
+	return a.SortListContainers[i].Created.Before(a.SortListContainers[j].Created)
 }
 
 func SortPsOutput(sortBy string, psOutput SortListContainers) (SortListContainers, error) {

pkg/ps/ps.go

@@ -180,7 +180,7 @@ func ListContainerBatch(rt *libpod.Runtime, ctr *libpod.Container, opts entities
 
 	ps := entities.ListContainer{
 		Command:   conConfig.Command,
-		Created:   conConfig.CreatedTime.Unix(),
+		Created:   conConfig.CreatedTime,
 		Exited:    exited,
 		ExitCode:  exitCode,
 		ExitedAt:  exitedTime.Unix(),
@@ -231,7 +231,7 @@ func ListStorageContainer(rt *libpod.Runtime, ctr storage.Container, opts entiti
 
 	ps := entities.ListContainer{
 		ID:      ctr.ID,
-		Created: ctr.Created.Unix(),
+		Created: ctr.Created,
 		ImageID: ctr.ImageID,
 		State:   "storage",
 		Names:   []string{name},
@@ -301,5 +301,5 @@ func (a SortPSContainers) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
 type SortPSCreateTime struct{ SortPSContainers }
 
 func (a SortPSCreateTime) Less(i, j int) bool {
-	return a.SortPSContainers[i].Created > a.SortPSContainers[j].Created
+	return a.SortPSContainers[i].Created.Before(a.SortPSContainers[j].Created)
 }