Add a StoppedByUser field to the DB

This field indicates that a container was explciitly stopped by
an API call, and did not exit naturally. It's used when
implementing restart policy for containers.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

libpod/container.go

@@ -179,6 +179,9 @@ type ContainerState struct {
 	// This maps the path the file will be mounted to in the container to
 	// the path of the file on disk outside the container
 	BindMounts map[string]string `json:"bindMounts,omitempty"`
+	// StoppedByUser indicates whether the container was stopped by an
+	// explicit call to the Stop() API.
+	StoppedByUser bool
 
 	// ExtensionStageHooks holds hooks which will be executed by libpod
 	// and not delegated to the OCI runtime.
@@ -1003,6 +1006,21 @@ func (c *Container) BindMounts() (map[string]string, error) {
 	return newMap, nil
 }
 
+// StoppedByUser returns whether the container was last stopped by an explicit
+// call to the Stop() API, or whether it exited naturally.
+func (c *Container) StoppedByUser() (bool, error) {
+	if !c.batched {
+		c.lock.Lock()
+		defer c.lock.Unlock()
+
+		if err := c.syncContainer(); err != nil {
+			return false, err
+		}
+	}
+
+	return c.state.StoppedByUser, nil
+}
+
 // Misc Accessors
 // Most will require locking