Secure boot check does not seem to work

[ralbertazzi]

cos-gpu-installer/cos-gpu-installer-docker/entrypoint.sh

Line 145 in 208c8a7

if is_secure_boot_enabled; then

I'm running the following script on a clean COS image with Secure Boot:

#!/bin/sh -eux

NVIDIA_INSTALL_DIR_HOST="/var/lib/nvidia"
NVIDIA_INSTALL_DIR_CONTAINER="/usr/local/nvidia"

mkdir -p "${NVIDIA_INSTALL_DIR_HOST}"
mount --bind "${NVIDIA_INSTALL_DIR_HOST}" "${NVIDIA_INSTALL_DIR_HOST}"
mount -o remount,exec "${NVIDIA_INSTALL_DIR_HOST}"

/usr/bin/docker run --rm \
  --privileged \
  --net=host \
  --pid=host \
  --volume /dev:/dev \
  --volume /:/root \
  --volume ${NVIDIA_INSTALL_DIR_HOST}:${NVIDIA_INSTALL_DIR_CONTAINER} \
  --env NVIDIA_DRIVER_VERSION=450.51.06 \
  gcr.io/cos-cloud/cos-gpu-installer:latest

However, the container doesn't seem to be able to detect that Secure Boot is enabled and reboots the machine. I've run dmesg outside of the container and it actually contains the string 'Secure boot enabled'.

Side question: does this installer actually support Secure Boot or it would simply exit performing no installation?