XDG_RUNTIME_DIR (/run/user/$UID) is used for user-specific data files
such as sockets, named pipes and so on. Therefore, it should not be
available to sandboxed processes.
Usage:
# ls -a $XDG_RUNTIME_DIR
. .. bus pipewire-0 systemd
# sandbox -R /root/sandbox/user -- sh -c "ls -a $XDG_RUNTIME_DIR"
. ..
Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
Acked-by: James Carter <jwcart2@gmail.com>