谁帮我看看这个container是哪里来的，有偿

check_lxc() {
# shellcheck disable=SC2154
if [ "$container" = "lxc" ] && [ ! -e /dev/ppp ]; then
cat 1>&2 <<'EOF'
Error: /dev/ppp is missing. LXC containers require configuration.
See: 网页链接 EOF
exit 1
fi
}