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To work with truly immutable filesystems, rather than ones we sneakily remount `rw`, we are going to use overlay for writeable containers. To leave the final mount as `rootfs`, in the writeable case we make a new `lower` path for the read only filesystem, and leave `rootfs` as a mount point for an overlay, with the writable layer and workdir mounted as a tmpfs on `tmp`. See https://github.com/linuxkit/linuxkit/issues/2288 Signed-off-by: Justin Cormack <justin.cormack@docker.com>