#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2016-2020 The Debian Live team
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


set -e

# Including common functions
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh

# Setting static variables
DESCRIPTION="Generates config for grub-pc and grub-efi, and installs loopback support"
USAGE="${PROGRAM} [--force]"

# Processing arguments and configuration files
Init_config_data "${@}"

# NOTE: This creates the config used for both grub-pc and grub-efi.
# It also installs loopback.cfg for looback support, which depends upon that
# config. Since loopback support is added unconditionally, this script is
# thus run unconditionally!
# TODO: Add an option to allow disabling loopback.cfg creation? (and thus conditionally run the script)

Echo_message "Begin installing config for grub-pc and/or grub-pc, and loopback support..."

# Requiring stage file
Require_stagefiles config bootstrap

# Checking stage file
Check_stagefile

# Acquire lock file
Acquire_lockfile

# Check architecture
Check_architectures amd64 i386 arm64
Check_crossarchitectures

_TARGET="binary/boot/grub"

# Local functions
Grub_live_menu_entry() {
	local LABEL="$1"
	local KERNEL="$2"
	local INITRD="$3"
	local APPEND="$4"
	local HOTKEY="${5:+ --hotkey=$5}"

	cat >> "${LIVE_ENTRIES_TMP}" <<END
menuentry "${LABEL}"${HOTKEY} {
	linux	$KERNEL $APPEND
	initrd	$INITRD
}
END
}

Grub_live_autodetect_menu_entry ()
{
	local LABEL="${1}"
	local AMD64_KERNEL="${2}"
	local AMD64_INITRD="${3}"
	local _686_KERNEL="${4}"
	local _686_INITRD="${5}"
	local APPEND="${6}"

	cat >> "${LIVE_ENTRIES_TMP}" <<END
# Autodetect if amd64 is supported
menuentry "$LABEL" {
	if cpuid -l; then
		linux ${AMD64_KERNEL} ${APPEND}
		initrd ${AMD64_INITRD}
	else
		linux ${_686_KERNEL} ${APPEND}
		initrd ${_686_INITRD}
	fi
}
END
}

# User config replacement/additional files
_SOURCE_USER="config/bootloaders/grub-pc"

# Copying templates
mkdir -p "${_TARGET}"
if [ -n "${LIVE_BUILD}" ]; then
	cp -a "${LIVE_BUILD}/share/bootloaders/grub-pc"/* "${_TARGET}"/
else
	cp -a "/usr/share/live/build/bootloaders/grub-pc"/* "${_TARGET}"/
fi
if [ -e "${_SOURCE_USER}" ]; then
	cp -af "${_SOURCE_USER}"/* "${_TARGET}"/
fi

case "${LB_INITRAMFS}" in
	live-boot)
		INITFS="live"
		;;

	*)
		INITFS="boot"
		;;
esac

# Setting boot parameters
if [ "${LB_UNION_FILESYSTEM}" != "overlay" ]; then
	LB_BOOTAPPEND_LIVE="${LB_BOOTAPPEND_LIVE} union=${LB_UNION_FILESYSTEM}"
fi

# Default entries
DEFAULT_FLAVOUR="$(echo ${LB_LINUX_FLAVOURS} | awk '{ print $1 }')"
DEFAULT_KERNEL="$(basename chroot/boot/vmlinuz-*${DEFAULT_FLAVOUR})"
DEFAULT_INITRD="initrd.img-$(echo ${DEFAULT_KERNEL} | sed -e 's|vmlinuz-||')"

KERNEL_LIVE="/${INITFS}/${DEFAULT_KERNEL}"
INITRD_LIVE="/${INITFS}/${DEFAULT_INITRD}"
APPEND_LIVE="${LB_BOOTAPPEND_LIVE} findiso=\${iso_path}"

# Ensure fresh live entries
LIVE_ENTRIES_TMP="${_TARGET}/live.cfg.tmp"
rm -f "${LIVE_ENTRIES_TMP}"

# Assemble live menu entries
_AMD64_686_NUMBER="0"

for _FLAVOUR in ${LB_LINUX_FLAVOURS}; do
	if [ "${_FLAVOUR}" = "amd64" -o "${_FLAVOUR}" = "686" ]; then
		_AMD64_686_NUMBER="$((${_AMD64_686_NUMBER} + 1))"
	fi
done

if [ "${_AMD64_686_NUMBER}" -ge 2 ] ; then
	# Default entries
	AMD64_KERNEL="$(basename chroot/boot/vmlinuz-*amd64)"
	AMD64_INITRD="initrd.img-$(echo ${AMD64_KERNEL} | sed -e 's|vmlinuz-||')"
	_686_KERNEL="$(basename chroot/boot/vmlinuz-*686)"
	_686_INITRD="initrd.img-$(echo ${_686_KERNEL} | sed -e 's|vmlinuz-||')"

	Grub_live_autodetect_menu_entry "Live system (autodetect)" \
		"/${INITFS}/${AMD64_KERNEL}" \
		"/${INITFS}/${AMD64_INITRD}" \
		"/${INITFS}/${_686_KERNEL}" \
		"/${INITFS}/${_686_INITRD}" \
		"${APPEND_LIVE}"

	if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]; then
		Grub_live_autodetect_menu_entry "Live system (autodetect) (fail-safe mode)" \
			"/${INITFS}/${AMD64_KERNEL}" \
			"/${INITFS}/${AMD64_INITRD}" \
			"/${INITFS}/${_686_KERNEL}" \
			"/${INITFS}/${_686_INITRD}" \
			"${LB_BOOTAPPEND_LIVE_FAILSAFE}"
	fi
else
	Grub_live_menu_entry "Live system" \
		"/${INITFS}/${DEFAULT_KERNEL}" \
		"/${INITFS}/${DEFAULT_INITRD}" \
		"${APPEND_LIVE}" \
		"l"
	if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]; then
		Grub_live_menu_entry "Live system (fail-safe mode)" \
			"/${INITFS}/${DEFAULT_KERNEL}" \
			"/${INITFS}/${DEFAULT_INITRD}" \
			"${LB_BOOTAPPEND_LIVE_FAILSAFE}"
	fi
fi

_COUNT=0
for KERNEL in chroot/boot/vmlinuz-*; do
	_COUNT=$(( $_COUNT + 1 ))
done

if [ $_COUNT -gt 1 ]; then
	for KERNEL in chroot/boot/vmlinuz-*; do
		VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')"

		Grub_live_menu_entry "Live system, kernel ${VERSION}" \
			"/${INITFS}/$(basename ${KERNEL})" \
			"/${INITFS}/initrd.img-${VERSION}" \
			"${APPEND_LIVE}"

		if [ "${LB_BOOTAPPEND_LIVE_FAILSAFE}" != "none" ]; then
			Grub_live_menu_entry "Live system, kernel ${VERSION} (fail-safe mode)" \
				"/${INITFS}/$(basename ${KERNEL})" \
				"/${INITFS}/initrd.img-${VERSION}" \
				"${LB_BOOTAPPEND_LIVE_FAILSAFE}"
		fi
	done
fi

# Replace placeholder with compiled live entries temporarily held in live.cfg.tmp
sed -i -e "/@LINUX_LIVE@/r ${LIVE_ENTRIES_TMP}" -e "/@LINUX_LIVE@/d" "${_TARGET}"/*.cfg
sed -i -e "/LINUX_LIVE/r ${LIVE_ENTRIES_TMP}" -e "/LINUX_LIVE/d" "${_TARGET}"/*.cfg #backwards compatibility
rm -f "${LIVE_ENTRIES_TMP}"

# Assembling debian-installer configuration
if [ "${LB_DEBIAN_INSTALLER}" != "none" ]; then
	ENABLE_INSTALL_MENU="true"

	KERNEL_DI="/install/vmlinuz"
	INITRD_DI="/install/initrd.gz"
	APPEND_DI="vga=normal ${LB_BOOTAPPEND_INSTALL} --- quiet"

	KERNEL_GI="/install/gtk/vmlinuz"
	INITRD_GI="/install/gtk/initrd.gz"
	APPEND_GI="vga=788 ${LB_BOOTAPPEND_INSTALL} --- quiet"

	if [ "${LB_DEBIAN_INSTALLER_GUI}" = "true" ]; then
		rm ${_TARGET}/install_text.cfg
		rm ${_TARGET}/install_start_text.cfg
		mv ${_TARGET}/install_gui.cfg ${_TARGET}/install.cfg
		mv ${_TARGET}/install_start_gui.cfg ${_TARGET}/install_start.cfg
	else
		rm ${_TARGET}/install_gui.cfg
		rm ${_TARGET}/install_start_gui.cfg
		mv ${_TARGET}/install_text.cfg ${_TARGET}/install.cfg
		mv ${_TARGET}/install_start_text.cfg ${_TARGET}/install_start.cfg
	fi
else
	ENABLE_INSTALL_MENU="false"
	rm "${_TARGET}"/install_text.cfg
	rm "${_TARGET}"/install_gui.cfg
	rm "${_TARGET}"/install_start_text.cfg
	rm "${_TARGET}"/install_start_gui.cfg
fi

# Assembling memtest configuration
MEMTEST_BIN="/${INITFS}/memtest"
if [ -f "binary/${MEMTEST_BIN}" ]; then
	ENABLE_MEMTEST="true"
	MEMTEST="source /boot/grub/memtest.cfg" #for backwards compatibility
else
	ENABLE_MEMTEST="false"
	rm -f "${_TARGET}"/memtest.cfg
fi

# These must be held in variables to avoid mistake by checkbashisms
LINUX_INSTALL="source /boot/grub/install_start.cfg"
LINUX_ADVANCED_INSTALL="source /boot/grub/install.cfg"

# Those without '@' markers are for backwards compatibility
sed -i \
    -e "s|@KERNEL_GI@|${KERNEL_GI}|" \
    -e "s|@INITRD_GI@|${INITRD_GI}|" \
    -e "s|@APPEND_GI@|${APPEND_GI}|" \
    -e "s|@KERNEL_DI@|${KERNEL_DI}|" \
    -e "s|@INITRD_DI@|${INITRD_DI}|" \
    -e "s|@APPEND_DI@|${APPEND_DI}|" \
    -e "s|@KERNEL_LIVE@|${KERNEL_LIVE}|" \
    -e "s|@INITRD_LIVE@|${INITRD_LIVE}|" \
    -e "s|@APPEND_LIVE@|${APPEND_LIVE}|" \
    -e "s|@LB_BOOTAPPEND_INSTALL@|${LB_BOOTAPPEND_INSTALL}|" \
    -e "s|@LB_BOOTAPPEND_LIVE_FAILSAFE@|${LB_BOOTAPPEND_LIVE_FAILSAFE}|" \
    -e "s|@LB_BOOTAPPEND_LIVE@|${LB_BOOTAPPEND_LIVE}|" \
    -e "s|@APPEND_INSTALL@|${LB_BOOTAPPEND_INSTALL}|" \
    -e "s|@ENABLE_INSTALL_MENU@|${ENABLE_INSTALL_MENU}|" \
    -e "s|@ENABLE_MEMTEST@|${ENABLE_MEMTEST}|" \
    -e "s|@MEMTEST_BIN@|${MEMTEST_BIN}|" \
    -e "s|@MEMTEST_VERSION@|${LB_MEMTEST}|" \
    -e "s|LINUX_INSTALL|${LINUX_INSTALL}|" \
    -e "s|LINUX_ADVANCED_INSTALL|${LINUX_ADVANCED_INSTALL}|" \
    -e "s|MEMTEST|${MEMTEST}|" \
    -e "s|KERNEL_GI|${KERNEL_GI}|" \
    -e "s|INITRD_GI|${INITRD_GI}|" \
    -e "s|APPEND_GI|${APPEND_GI}|" \
    -e "s|KERNEL_DI|${KERNEL_DI}|" \
    -e "s|INITRD_DI|${INITRD_DI}|" \
    -e "s|APPEND_DI|${APPEND_DI}|" \
    -e "s|KERNEL_LIVE|${KERNEL_LIVE}|" \
    -e "s|INITRD_LIVE|${INITRD_LIVE}|" \
    -e "s|APPEND_LIVE|${APPEND_LIVE}|" \
    -e "s|LB_BOOTAPPEND_INSTALL|${LB_BOOTAPPEND_INSTALL}|" \
    -e "s|LB_BOOTAPPEND_LIVE_FAILSAFE|${LB_BOOTAPPEND_LIVE_FAILSAFE}|" \
    -e "s|LB_BOOTAPPEND_LIVE|${LB_BOOTAPPEND_LIVE}|" \
    "${_TARGET}"/*.cfg

sed -i -e 's|//|/|g' "${_TARGET}"/*.cfg
sed -i -e 's|\ $||g' "${_TARGET}"/*.cfg

# Add loopback support
echo "source /boot/grub/grub.cfg" > "${_TARGET}"/loopback.cfg

# Creating stage file
Create_stagefile