fix(executor): Delegate PNS wait to K8SAPI executor.

workflow/executor/common/common.go

@@ -70,13 +70,21 @@ func isTerminated(ctx context.Context, c KubernetesClientInterface, containerNam
 	if err != nil {
 		return false, err
 	}
-	for _, s := range containerStatus {
-		log.Debugf("%q %v", s.Name, s.State.Terminated)
-		if s.State.Terminated == nil && slice.ContainsString(containerNames, s.Name) {
-			return false, nil
+	return AllTerminated(containerStatus, containerNames), nil
+}
+
+func AllTerminated(containerStatuses []v1.ContainerStatus, containerNames []string) bool {
+	terminated := make(map[string]bool)
+	// I've seen a few cases where containers are missing from container status just after a pod started.
+	for _, c := range containerStatuses {
+		terminated[c.Name] = c.State.Terminated != nil
+	}
+	for _, n := range containerNames {
+		if !terminated[n] {
+			return false
 		}
 	}
-	return true, nil
+	return true
 }
 
 // TerminatePodWithContainerID invoke the given SIG against the PID1 of the container.

workflow/executor/k8sapi/k8sapi.go

@@ -12,7 +12,7 @@ import (
 	restclient "k8s.io/client-go/rest"
 
 	"github.com/argoproj/argo-workflows/v3/errors"
-	"github.com/argoproj/argo-workflows/v3/util/slice"
+	"github.com/argoproj/argo-workflows/v3/workflow/executor/common"
 )
 
 type K8sAPIExecutor struct {
@@ -58,12 +58,7 @@ func (k *K8sAPIExecutor) GetExitCode(ctx context.Context, containerName string)
 // Wait for the container to complete
 func (k *K8sAPIExecutor) Wait(ctx context.Context, containerNames, sidecarNames []string) error {
 	return k.Until(ctx, func(pod *corev1.Pod) bool {
-		for _, s := range pod.Status.ContainerStatuses {
-			if s.State.Terminated == nil && slice.ContainsString(containerNames, s.Name) {
-				return false
-			}
-		}
-		return true
+		return common.AllTerminated(pod.Status.ContainerStatuses, containerNames)
 	})
 }
 

workflow/executor/pns/pns.go

@@ -158,14 +158,13 @@ func (p *PNSExecutor) Wait(ctx context.Context, containerNames, sidecarNames []s
 		time.Sleep(1 * time.Second)
 	}
 
-	if !p.haveContainerPIDs(containerNames) {
-		log.Info("container PIDs still unknown (maybe short running container, or late starting)")
-		return p.K8sAPIExecutor.Wait(ctx, containerNames, sidecarNames)
-	}
-
 OUTER:
 	for _, containerName := range containerNames {
 		pid := p.getContainerPID(containerName)
+		if pid == 0 {
+			log.Infof("container %q pid unknown - maybe short running, or late starting container", containerName)
+			continue
+		}
 		log.Infof("Waiting for %q pid %d to complete", containerName, pid)
 		for {
 			select {
@@ -184,7 +183,8 @@ OUTER:
 			}
 		}
 	}
-	return nil
+
+	return p.K8sAPIExecutor.Wait(ctx, containerNames, sidecarNames)
 }
 
 // pollRootProcesses will poll /proc for root pids (pids without parents) in a tight loop, for the