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If we are running in a user namespace, don't try to mknod as it won't be allowed. libcontainer will bind-mount the host's devices over files in the container anyway, so it's not needed. The chrootarchive package does a chroot (without mounting /proc) before its work, so we cannot check /proc/self/uid_map when we need to. So compute it in advance and pass it along with the tar options. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>