#!/usr/bin/env bash

. /etc/os-release
if [ -d /sys/firmware/efi -a -e /boot/efi/EFI/centos/grub.cfg ]; then
	CONFDIR=/boot/efi/EFI/centos
elif [ -d /sys/firmware/efi -a -e /boot/efi/EFI/rocky/grub.cfg ]; then
	CONFDIR=/boot/efi/EFI/rocky
elif [ -d /sys/firmware/efi -a -e /boot/efi/EFI/almalinux/grub.cfg ]; then
	CONFDIR=/boot/efi/EFI/almalinux
elif [ -d /sys/firmware/efi -a -e /boot/efi/EFI/redhat/grub.cfg ]; then
	CONFDIR=/boot/efi/EFI/redhat
else
	CONFDIR=/boot/grub2
fi
#grep "^menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2 | grep -Ev '(with debugging$|-rescue-)' | grep ^"$NAME" | sort -n | tail -n 1
# grep "^menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2 | grep -Ev '(with debugging$|-rescue-)' | head -n1
# grub2-set-default "CentOS Linux (4.7.2-1.el7.elrepo.x86_64) 7 (Core)"
# Contrôle : grub2-editenv list
KERNLIST="$(ls -1 /boot/vmlinuz-* | grep -v rescue | sed 's|/boot/vmlinuz-\([.0-9]*\)-.*|\1|')"
LASTMAJKERNEL="$(echo $KERNLIST | sed 's/ /\n/g' | cut -d. -f1 | sort -n -u | while read i; do
	echo $KERNLIST | sed 's/ /\n/g' | grep ^$i | cut -d. -f1-2 | sort -n -u -k2 -t.
done | while read j; do
	echo $KERNLIST | sed 's/ /\n/g' | grep ^$j | sort -n -u -k3 -t.
done | tail -n 1)"

KERNLIST="$(ls -1 /boot/vmlinuz-* | grep -v rescue | sed 's|/boot/vmlinuz-'${LASTMAJKERNEL}'-\([.0-9]*\).*|\1|')"
LASTKERNEL="${LASTMAJKERNEL}-$(echo $KERNLIST | sed -e 's/ /\n/g' -e 's/.$//' | cut -d. -f1 | sort -n -u | while read i; do
	echo $KERNLIST | sed 's/ /\n/g' | grep ^$i | cut -d. -f1-2 | sort -n -u -k2 -t.
done | while read j; do
	echo $KERNLIST | sed 's/ /\n/g' | grep ^$j | sort -n -u -k3 -t.
done | tail -n 1)"

grub2-set-default "$(grep "^menuentry" "${CONFDIR}"/grub.cfg | cut -d \' -f2 | grep -Ev '(with debugging$|-rescue-)' | grep ^"$NAME" | grep $LASTKERNEL | sort -n | tail -n 1)"

grub2-mkconfig -o "${CONFDIR}"/grub.cfg