// checkAndUpdatePod updates existing, and:
// * if ref makes a meaningful change, returns needUpdate=true
// * if ref makes a meaningful change, and this change is graceful deletion, returns needGracefulDelete=true
// * if ref makes no meaningful change, but changes the pod status, returns needReconcile=true
// * else return all false
// Now, needUpdate, needGracefulDelete and needReconcile should never be both true
func checkAndUpdatePod(existing, ref *v1.Pod) (needUpdate, needReconcile, needGracefulDelete bool) {
// 1. this is a reconcile
// TODO: it would be better to update the whole object and only preserve certain things
// like the source annotation or the UID (to ensure safety)
if !podsDifferSemantically(existing, ref) {
// this is not an update
// Only check reconcile when it is not an update, because if the pod is going to
// be updated, an extra reconcile is unnecessary
if !reflect.DeepEqual(existing.Status, ref.Status) {
// Pod with changed pod status needs reconcile, because kubelet should
// be the source of truth of pod status.
existing.Status = ref.Status
needReconcile = true
}
return
}
// Overwrite the first-seen time with the existing one. This is our own
// internal annotation, there is no need to update.
ref.Annotations[kubetypes.ConfigFirstSeenAnnotationKey] = existing.Annotations[kubetypes.ConfigFirstSeenAnnotationKey]
existing.Spec = ref.Spec
existing.Labels = ref.Labels
existing.DeletionTimestamp = ref.DeletionTimestamp
existing.DeletionGracePeriodSeconds = ref.DeletionGracePeriodSeconds
existing.Status = ref.Status
updateAnnotations(existing, ref)
// 2. this is an graceful delete
if ref.DeletionTimestamp != nil {
needGracefulDelete = true
} else {
// 3. this is an update
needUpdate = true
}
return
}
