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
 

libpod/container_internal.go

@@ -376,6 +376,7 @@ func resetState(state *ContainerState) error {
 	state.ExecSessions = make(map[string]*ExecSession)
 	state.NetworkStatus = nil
 	state.BindMounts = make(map[string]string)
+	state.StoppedByUser = false
 
 	return nil
 }
@@ -789,6 +790,7 @@ func (c *Container) init(ctx context.Context) error {
 	c.state.ExitCode = 0
 	c.state.Exited = false
 	c.state.State = ContainerStateCreated
+	c.state.StoppedByUser = false
 
 	if err := c.save(); err != nil {
 		return err
@@ -950,6 +952,11 @@ func (c *Container) stop(timeout uint) error {
 		return err
 	}
 
+	c.state.StoppedByUser = true
+	if err := c.save(); err != nil {
+		return errors.Wrapf(err, "error saving container %s state after stopping", c.ID())
+	}
+
 	// Wait until we have an exit file, and sync once we do
 	return c.waitForExitFileAndSync()
 }