x86: add preinit hook for bootloader upgrade

[openwrt/staging/mkresin.git] / target / linux / x86 / base-files / lib / preinit / 81_upgrade_bootloader

diff --git a/target/linux/x86/base-files/lib/preinit/81_upgrade_bootloader b/target/linux/x86/base-files/lib/preinit/81_upgrade_bootloader
new file mode 100644 (file)
index 0000000..3a4e756
--- /dev/null
+++ b/target/linux/x86/base-files/lib/preinit/81_upgrade_bootloader
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+upgrade_bootloader() {
+       local diskdev
+
+       . /lib/upgrade/common.sh
+
+       if [ ! -f /boot/grub/upgraded ] && export_bootdevice && export_partdevice diskdev 0; then
+               echo "(hd0) /dev/$diskdev" > /tmp/device.map
+               /usr/sbin/grub-bios-setup \
+                       -m "/tmp/device.map" \
+                       -d "/boot/grub" \
+                       -r "hd0,msdos1" \
+                       "/dev/$diskdev" \
+               && touch /boot/grub/upgraded
+       fi
+}
+
+[ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main upgrade_bootloader