grubupdate.sh

#!/bin/bash

set -e

NEW_CONFIG='/root/grub.cfg.new'
OLD_CONFIG='/boot/efi/EFI/fedora/grub.cfg'


checkpoint() { echo -e "\033[1m\n$*\033[0m"; }


checkpoint "edit grub defaults:"
sudo vim /etc/default/grub

checkpoint "generate config: $NEW_CONFIG"
sudo grub2-mkconfig 2>/dev/null | sudo tee "$NEW_CONFIG" > /dev/null


checkpoint "changes:"
if sudo diff -u --color "$OLD_CONFIG" "$NEW_CONFIG"; then
	echo "none"
	exit 1
fi


checkpoint "backup and install new config?"
read -p '(y/N): '
if [[ ! $REPLY =~ ^y|Y ]]; then
	echo "exiting"
	exit 1
fi


checkpoint "making backup:"
timestamp=$(date +'%Y%m%d%H%M%S')
backup="/root/grub.cfg.${timestamp}~"
set -x
sudo cp "$OLD_CONFIG" "$backup"
sudo chmod -x "$backup"
sudo mv "$NEW_CONFIG" "$OLD_CONFIG"
sudo chmod +x "$OLD_CONFIG"