Add pod state

Add a mutable state to pods, and database backend sutable for
modifying and updating said state.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #784
Approved by: rhatdan

1 files changed, 30 insertions, 0 deletions

diff --git a/libpod/in_memory_state.go b/libpod/in_memory_state.go
index 386ace5b6..36077b9d1 100644
--- a/libpod/in_memory_state.go
+++ b/libpod/in_memory_state.go
@@ -604,6 +604,36 @@ func (s *InMemoryState) RemoveContainerFromPod(pod *Pod, ctr *Container) error {
 	return nil
 }
 
+// UpdatePod updates a pod in the state
+// This is a no-op as there is no backing store
+func (s *InMemoryState) UpdatePod(pod *Pod) error {
+	if !pod.valid {
+		return ErrPodRemoved
+	}
+
+	if _, ok := s.pods[pod.ID()]; !ok {
+		pod.valid = false
+		return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID())
+	}
+
+	return nil
+}
+
+// SavePod updates a pod in the state
+// This is a no-op at there is no backing store
+func (s *InMemoryState) SavePod(pod *Pod) error {
+	if !pod.valid {
+		return ErrPodRemoved
+	}
+
+	if _, ok := s.pods[pod.ID()]; !ok {
+		pod.valid = false
+		return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID())
+	}
+
+	return nil
+}
+
 // AllPods retrieves all pods currently in the state
 func (s *InMemoryState) AllPods() ([]*Pod, error) {
 	pods := make([]*Pod, 0, len(s.pods))