Legacy plugins expect host-relative paths (such as for Volume.Mount).
However, a containerized plugin cannot respond with a host-relative
path. Therefore, this commit modifies new volume plugins' paths in Mount
and List to prepend the container's rootfs path.
This introduces a new PropagatedMount field in the Plugin Config.
When it is set for volume plugins, RootfsPropagation is set to rshared
and the path specified by PropagatedMount is bind-mounted with rshared
prior to launching the container. This is so that the daemon code can
access the paths returned by the plugin from the host mount namespace.
Signed-off-by: Tibor Vass <tibor@docker.com>
plugingetter is indepedent of docker/docker packages, so it can be
moved to pkg. This is also necessary for authorization plugins (part of
pkg) to use pluginv2. The original path at plugin/getter will be
eventually removed, when external repos (eg. libnetwork) update their
import paths.
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
