Use dedicated type for Container State

Co-authored-by: Sebastiaan van Stijn <[email protected]>
Signed-off-by: Renaud Gaubert <[email protected]>

specs-go/state.go

@@ -1,18 +1,21 @@
 package specs
 
+// ContainerState represents the state of a container.
+type ContainerState string
+
 const (
  // StateCreating indicates that the container is being created
- StateCreating = "creating"
+ StateCreating ContainerState = "creating"
 
  // StateCreated indicates that the runtime has finished the create operation
- StateCreated = "created"
+ StateCreated ContainerState = "created"
 
  // StateRunning indicates that the container process has executed the
  // user-specified program but has not exited
- StateRunning = "running"
+ StateRunning ContainerState = "running"
 
  // StateStopped indicates that the container process has exited
- StateStopped = "stopped"
+ StateStopped ContainerState = "stopped"
 )
 
 // State holds information about the runtime state of the container.