#!/bin/bash

mkinitcpio_has_grub_btrfs_overlayfs_hook() {
	grep -qe "^HOOKS=.*grub-btrfs-overlayfs" /etc/mkinitcpio.conf
}

post_install() {
	# Change grub snapshot submenu name
	if [ -e /etc/lsb-release ]; then
		echo "Using default grub snapshot submenu name"
	else
		sed -i /etc/default/grub-btrfs/config \
			-e "s,.*GRUB_BTRFS_SUBMENUNAME=.*,GRUB_BTRFS_SUBMENUNAME=\"$(sed '/^NAME=/!d;s/NAME=//;s/"//gm' /etc/os-release) snapshots\","
		echo "Generating grub snapshot submenu name from /etc/os-release values"
	fi

	if [[ $(/usr/bin/systemctl is-enabled grub-btrfs.path) == "enabled" ]]; then
		/usr/bin/systemctl disable --now grub-btrfs.path
	fi

	echo "Enabling automatic rebuild of grub-btrfs when snapshots are taken"
	/usr/bin/systemctl daemon-reload
	/usr/bin/systemctl enable --now grub-btrfs-snapper.path
	/usr/bin/systemctl enable --now snapper-cleanup.timer
	#/usr/bin/systemctl enable snapper-timeline.timer

	echo "Creating snapper config for root"
	/usr/bin/snapper create-config --template garuda /

	if ! mkinitcpio_has_grub_btrfs_overlayfs_hook; then
		sed -re 's/(^HOOKS=[\"|(][^")]+)/\1 grub-btrfs-overlayfs/gi' -i /etc/mkinitcpio.conf
	fi
}

pre_remove() {
	echo "Deleting snapper config for root"
	/usr/bin/snapper delete-config
	if mkinitcpio_has_grub_btrfs_overlayfs_hook; then
		sed -re 's/(^HOOKS=["(].*) grub-btrfs-overlayfs/\1/g' -i /etc/mkinitcpio.conf
	fi
	echo "Disabling related snapper and grub-btrfs services"
	/usr/bin/systemctl disable --now grub-btrfs-snapper.path
	/usr/bin/systemctl disable --now snapper-cleanup.timer
	#/usr/bin/systemctl disable snapper-timeline.timer
}
