avoid saving container state to disk before daemon.Register

Migrate legacy volumes (Daemon.verifyVolumesInfo) before containers are
registered on the Daemon, so state on disk is not overwritten and legacy
fields lost during registration.

Signed-off-by: Fabio Kung <fabio.kung@gmail.com>

daemon/daemon.go

@@ -187,17 +187,16 @@ func (daemon *Daemon) restore() error {
 			delete(containers, id)
 			continue
 		}
-		if err := daemon.Register(c); err != nil {
-			logrus.Errorf("Failed to register container %s: %s", c.ID, err)
-			delete(containers, id)
-			continue
-		}
-
 		// verify that all volumes valid and have been migrated from the pre-1.7 layout
 		if err := daemon.verifyVolumesInfo(c); err != nil {
 			// don't skip the container due to error
 			logrus.Errorf("Failed to verify volumes for container '%s': %v", c.ID, err)
 		}
+		if err := daemon.Register(c); err != nil {
+			logrus.Errorf("Failed to register container %s: %s", c.ID, err)
+			delete(containers, id)
+			continue
+		}
 
 		// The LogConfig.Type is empty if the container was created before docker 1.12 with default log driver.
 		// We should rewrite it to use the daemon defaults.

daemon/daemon_unix_test.go

@@ -274,10 +274,6 @@ func TestMigratePre17Volumes(t *testing.T) {
 		}
 	`)
 
-	viewDB, err := container.NewViewDB()
-	if err != nil {
-		t.Fatal(err)
-	}
 	volStore, err := store.New(volumeRoot)
 	if err != nil {
 		t.Fatal(err)
@@ -289,10 +285,9 @@ func TestMigratePre17Volumes(t *testing.T) {
 	volumedrivers.Register(drv, volume.DefaultDriverName)
 
 	daemon := &Daemon{
-		root:              rootDir,
-		repository:        containerRoot,
-		containersReplica: viewDB,
-		volumes:           volStore,
+		root:       rootDir,
+		repository: containerRoot,
+		volumes:    volStore,
 	}
 	err = ioutil.WriteFile(filepath.Join(containerRoot, cid, "config.v2.json"), config, 600)
 	if err != nil {

daemon/volumes_unix.go

@@ -180,7 +180,6 @@ func (daemon *Daemon) verifyVolumesInfo(container *container.Container) error {
 				container.MountPoints[destination] = &m
 			}
 		}
-		return container.CheckpointTo(daemon.containersReplica)
 	}
 	return nil
 }

integration-cli/docker_cli_daemon_test.go

@@ -2684,7 +2684,7 @@ func (s *DockerDaemonSuite) TestDaemonBackcompatPre17Volumes(c *check.C) {
 	`)
 
 	configPath := filepath.Join(d.Root, "containers", id, "config.v2.json")
-	err = ioutil.WriteFile(configPath, config, 600)
+	c.Assert(ioutil.WriteFile(configPath, config, 600), checker.IsNil)
 	d.Start(c)
 
 	out, err = d.Cmd("inspect", "--type=container", "--format={{ json .Mounts }}", id)