Decouple daemon and container to mount and unmount filesystems.

Side effects:
- Decouple daemon and container to start containers.
- Decouple daemon and container to copy files.

Signed-off-by: David Calavera <david.calavera@gmail.com>
Upstream-commit: 3a497650464b40191bd2cde348e676acf4efe270
Component: engine

components/engine/daemon/daemonbuilder/builder.go

@@ -96,7 +96,8 @@ func (d Docker) Create(cfg *runconfig.Config, hostCfg *runconfig.HostConfig) (*d
 	if err != nil {
 		return nil, ccr.Warnings, err
 	}
-	return container, ccr.Warnings, container.Mount()
+
+	return container, ccr.Warnings, d.Mount(container)
 }
 
 // Remove removes a container specified by `id`.
@@ -210,6 +211,21 @@ func (d Docker) Kill(container *daemon.Container) error {
 	return d.Daemon.Kill(container)
 }
 
+// Mount mounts the root filesystem for the container.
+func (d Docker) Mount(c *daemon.Container) error {
+	return d.Daemon.Mount(c)
+}
+
+// Unmount unmounts the root filesystem for the container.
+func (d Docker) Unmount(c *daemon.Container) error {
+	return d.Daemon.Unmount(c)
+}
+
+// Start starts a container
+func (d Docker) Start(c *daemon.Container) error {
+	return d.Daemon.Start(c)
+}
+
 // Following is specific to builder contexts
 
 // DetectContextFromRemoteURL returns a context and in certain cases the name of the dockerfile to be used