#!/bin/bash
#
# Copyright (c) 2013-2021 Igor Pecovnik, igor.pecovnik@gma**.com

# Functions:

# mount_chroot
# umount_chroot
# unmount_on_exit
# check_loop_device
# install_external_applications
# write_uboot
# copy_all_packages_files_for
# customize_image
# install_deb_chroot
# run_on_sdcard


# mount_chroot <target>
#
# helper to reduce code duplication
#
mount_chroot()
{
	local target=$1
	mount -t proc chproc "${target}"/proc
	mount -t sysfs chsys "${target}"/sys
	mount -t devtmpfs chdev "${target}"/dev || mount --bind /dev "${target}"/dev
	mount -t devpts chpts "${target}"/dev/pts
}

# umount_chroot <target>
#
# helper to reduce code duplication
#
umount_chroot()
{
	local target=$1
	display_alert "Unmounting" "$target" "info"
	while grep -Eq "${target}.*(dev|proc|sys)" /proc/mounts
	do
		umount -l --recursive "${target}"/dev >/dev/null 2>&1
		umount -l "${target}"/proc >/dev/null 2>&1
		umount -l "${target}"/sys >/dev/null 2>&1
		sleep 5
	done
}

unmount_on_exit()
{
	trap - INT TERM EXIT
	local stacktrace="$(get_extension_hook_stracktrace "${BASH_SOURCE[*]}" "${BASH_LINENO[*]}")"
	display_alert "unmount_on_exit() called!" "$stacktrace" "err"
	if [[ "${ERROR_DEBUG_SHELL}" == "yes" ]]; then
		ERROR_DEBUG_SHELL=no # dont do it twice
		display_alert "MOUNT" "${MOUNT}" "err"
		display_alert "SDCARD" "${SDCARD}" "err"
		display_alert "ERROR_DEBUG_SHELL=yes, starting a shell." "ERROR_DEBUG_SHELL" "err"
		bash < /dev/tty || true
	fi

	umount_chroot "${SDCARD}/"
	umount -l "${SDCARD}"/tmp >/dev/null 2>&1
	umount -l "${SDCARD}" >/dev/null 2>&1
	umount -l "${MOUNT}"/boot >/dev/null 2>&1
	umount -l "${MOUNT}" >/dev/null 2>&1
	losetup -d "${LOOP}" >/dev/null 2>&1
	rm -rf --one-file-system "${SDCARD}"
	exit_with_error "debootstrap-ng was interrupted" || true # don't trigger again
}

check_loop_device()
{
	local device=$1
	if [[ ! -b $device ]]; then
		if [[ $CONTAINER_COMPAT == yes && -b /tmp/$device ]]; then
			display_alert "Creating device node" "$device"
			mknod -m0660 "${device}" b "0x$(stat -c '%t' "/tmp/$device")" "0x$(stat -c '%T' "/tmp/$device")"
		else
			exit_with_error "Device node $device does not exist"
		fi
	fi
}

write_uboot()
{
	local loop=$1 revision
	display_alert "Writing U-boot bootloader" "$loop" "info"
	TEMP_DIR=$(mktemp -d || exit 1)
	chmod 700 ${TEMP_DIR}
	revision=${REVISION}
	if [[ -n $UPSTREM_VER ]]; then
		revision=${UPSTREM_VER}
		dpkg -x "${DEB_STORAGE}/u-boot/linux-u-boot-${BOARD}-${BRANCH}_${revision}_${ARCH}.deb" ${TEMP_DIR}/
	else
		dpkg -x "${DEB_STORAGE}/u-boot/${CHOSEN_UBOOT}_${revision}_${ARCH}.deb" ${TEMP_DIR}/
	fi

	# source platform install to read $DIR
	source ${TEMP_DIR}/usr/lib/u-boot/platform_install.sh
	write_uboot_platform "${TEMP_DIR}${DIR}" "$loop"
	[[ $? -ne 0 ]] && exit_with_error "U-boot bootloader failed to install" "@host"
	rm -rf ${TEMP_DIR}
}

# copy_all_packages_files_for <folder> to package
#
copy_all_packages_files_for()
{
	local package_name="${1}"
	for package_src_dir in ${PACKAGES_SEARCH_ROOT_ABSOLUTE_DIRS};
	do
		local package_dirpath="${package_src_dir}/${package_name}"
		if [ -d "${package_dirpath}" ];
		then
			cp -r "${package_dirpath}/"* "${destination}/" 2> /dev/null
			display_alert "Adding files from" "${package_dirpath}"
		fi
	done
}

customize_image()
{
	cp "$USERPATCHES_PATH"/customize-image.sh "${SDCARD}"/tmp/customize-image.sh
	chmod +x "${SDCARD}"/tmp/customize-image.sh
	mkdir -p "${SDCARD}"/tmp/overlay
	# util-linux >= 2.27 required
	mount -o bind,ro "$USERPATCHES_PATH"/overlay "${SDCARD}"/tmp/overlay
	display_alert "Calling image customization script" "customize-image.sh" "info"
	chroot "${SDCARD}" /bin/bash -c "/tmp/customize-image.sh $RELEASE $LINUXFAMILY $BOARD $ARCH"
	CUSTOMIZE_IMAGE_RC=$?
	umount -i "${SDCARD}"/tmp/overlay >/dev/null 2>&1
	mountpoint -q "${SDCARD}"/tmp/overlay || rm -r "${SDCARD}"/tmp/overlay
	if [[ $CUSTOMIZE_IMAGE_RC != 0 ]]; then
		exit_with_error "customize-image.sh exited with error (rc: $CUSTOMIZE_IMAGE_RC)"
	fi
}

install_deb_chroot()
{
	local package=$1
	local variant=$2
	local transfer=$3
	local name
	local desc
	if [[ ${variant} != remote ]]; then
		name="/root/"$(basename "${package}")
		[[ ! -f "${SDCARD}${name}" ]] && cp "${package}" "${SDCARD}${name}"
		desc=""
	else
		name=$1
		desc=" from repository"
	fi

	display_alert "Installing${desc}" "${name/\/root\//}"
	chroot "${SDCARD}" /bin/bash -c "DEBIAN_FRONTEND=noninteractive apt-get -yqq $apt_extra --no-install-recommends install $name" >> "${DEST}"/${LOG_SUBPATH}/install.log 2>&1
	[[ $? -ne 0 ]] && exit_with_error "Installation of $name failed" "${BOARD} ${RELEASE} ${LINUXFAMILY}"
	[[ ${variant} == remote && ${transfer} == yes ]] && rsync -rq "${SDCARD}"/var/cache/apt/archives/*.deb ${DEB_STORAGE}/
}

dpkg_install_deb_chroot()
{
	local package=$1
	local name
	local desc

	name="/root/"$(basename "${package}")
	[[ ! -f "${SDCARD}${name}" ]] && cp "${package}" "${SDCARD}${name}"

	display_alert "Installing${desc}" "${name/\/root\//}"

	package_name=$(echo $(basename "${package}") | cut -d "_" -f1)
	# when building in bulk from remote, lets make sure we have up2date index
	chroot "${SDCARD}" /bin/bash -c "dpkg -i $name" >> "${DEST}"/${LOG_SUBPATH}/install.log 2>&1
	chroot "${SDCARD}" /bin/bash -c "apt-mark hold $package_name" >> "${DEST}"/${LOG_SUBPATH}/install.log 2>&1
	[[ $? -ne 0 ]] && exit_with_error "Installation of $name failed" "${BOARD} ${RELEASE} ${LINUXFAMILY}"
}

run_on_sdcard()
{
	# Lack of quotes allows for redirections and pipes easily.
	chroot "${SDCARD}" /bin/bash -c "${@}" >> "${DEST}"/${LOG_SUBPATH}/install.log
}
