Do we want to (and will users accept) the Docker daemon changing permissions on an existing path for (root dir) access to work via a user namespaced process? #25847
Description
Just as Ubuntu 16.04 lxcfs bug got fixed, now with the new namespace feature we are not able to use namespaces together with the --graph parameter.
When using Docker 1.12.0 and lxcfs 2.0.3 with --userns-remap=Default and --graph /media/user/somedrive/docker throws the following error when doing any command such as docker run hello-world:
docker: Error response from daemon: oci runtime error: rootfs_linux.go:42: preparing rootfs caused "permission denied".
On my development machine I have a small SSD so I'm not able to use the default /var/lib/docker for long before I run out of space from having to work with many images. Being able to use the --graph feature would really help with the already awesome docker namespace feature.