target/linux/x86/base-files/lib/preinit/81_upgrade_bootloader

   1 upgrade_bootloader() {
   2         local diskdev
   3
   4         . /lib/upgrade/common.sh
   5
   6         if [ ! -f /boot/grub/upgraded ] && export_bootdevice && export_partdevice diskdev 0; then
   7                 part_magic_efi "/dev/$diskdev" && return 0
   8                 echo "(hd0) /dev/$diskdev" > /tmp/device.map
   9                 /usr/sbin/grub-bios-setup \
  10                         -m "/tmp/device.map" \
  11                         -d "/boot/grub" \
  12                         -r "hd0,msdos1" \
  13                         "/dev/$diskdev" \
  14                 && touch /boot/grub/upgraded
  15         fi
  16 }
  17
  18 [ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main upgrade_bootloader