bazzite/system_files/deck/shared/usr/bin/steamos-update

#!/bin/bash

if command -v ublue-update > /dev/null; then
  if [ "$1" == "check" ]; then
    if [ -f '/tmp/upgrade-installed' ]; then
      exit 7 # Upgrade already installed
    else
      # Perform connectivity check
      wget -q --spider https://github.com
      if [ $? -eq 0 ]; then
        # Check system state
        ublue-update --check --updatecheck
        if [ $? -eq 0 ]; then
          exit 0 # Upgrade available
        else
          exit 7 # Checks failed
        fi
      else
        exit 7 # Connectivity check failed
      fi
    fi
  elif [ "$1" == "--supports-duplicate-detection" ]; then
    exit 0
  else
    # Fake upgrade progress bar
    fake_progress() {
      local value=0
      while [ ! -f '/tmp/upgrade-check' ]; do
        sleep 5
        if [ ${value} -lt '100' ]; then
          echo ${value}'%'
          value=$(( value + 3 ))
        fi
      done
      echo 100%
    }
    upgrade() {
      # Pull exit code from ublue-update
      ublue-update --force > /dev/null 2>&1
      echo $? > /tmp/upgrade-check
    }
    upgrade | fake_progress
    # Check if upgrade failed
    UPGRADE_CHECK=/tmp/upgrade-check
    rm /tmp/upgrade-check
    if [ ${UPGRADE_CHECK} -eq 0 ]; then
      touch /tmp/upgrade-installed
    else
      exit 0 # Upgrade failed
    fi
  fi
else
  exit 7 # ublue-update not installed
fi