#!/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="Build rootfs image"
USAGE="${PROGRAM} [--force]"

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

Echo_message "Begin building root filesystem image..."

# Requiring stage file
Require_stagefiles config bootstrap binary_chroot

# Checking stage file
Check_stagefile

# Acquire lock file
Acquire_lockfile

case "${LB_ARCHITECTURE}" in
	amd64|i386)
		LINUX="vmlinuz"
		;;

	powerpc|ppc64el|riscv64)
		LINUX="vmlinux"
		;;
esac

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

	*)
		INITFS="boot"
		;;
esac

# Creating directory
mkdir -p binary/${INITFS}

if In_list "rootfs" ${LB_CACHE_STAGES} && [ -d cache/binary_rootfs ]
then
	# Removing old chroot
	rm -rf binary/"${INITFS}"/filesystem.*

	# Restoring old cache
	mkdir -p binary/"${INITFS}"
	cp -a cache/binary_rootfs/filesystem.* binary/"${INITFS}"

	# Creating stage file
	Create_stagefile
	exit 0
fi

case "${LB_CHROOT_FILESYSTEM}" in
	ext2|ext3|ext4)
		# Checking depends
		Check_package chroot /sbin/mkfs.${LB_CHROOT_FILESYSTEM} e2fsprogs

		# Restoring cache
		Restore_package_cache binary

		# Installing depends
		Install_packages

		# Remove old image
		if [ -f binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM} ]
		then
			rm -f binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM}
		fi

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				DU_DIM="$(du -ms chroot/chroot | cut -f1)"
				INODES="$(find chroot/chroot | wc -l)"
				;;

			false)
				DU_DIM="$(du -ms chroot | cut -f1)"
				INODES="$(find chroot | wc -l)"
				;;
		esac

		REAL_DIM="$(Calculate_partition_size ${DU_DIM} ${LB_CHROOT_FILESYSTEM})"
		REAL_INODES="$(Calculate_partition_size ${INODES} ${LB_CHROOT_FILESYSTEM})"

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				dd if=/dev/zero of=chroot/filesystem.${LB_CHROOT_FILESYSTEM} bs=1024k count=0 seek=${REAL_DIM}

				FAKE_MTAB=false
				if ! Chroot chroot "test -e /etc/mtab"
				then
					Chroot chroot "ln -s /proc/mounts/mtab /etc/mtab"
					FAKE_MTAB=true
				fi
				BLOCK_SIZE=1024
				if [ "${LB_DM_VERITY}" = "true" ]
				then
					# dm-verity needs a block size of at least 4k
					BLOCK_SIZE=4096
				fi
				Chroot chroot "mkfs.${LB_CHROOT_FILESYSTEM} -F -b ${BLOCK_SIZE} -N ${REAL_INODES} -m 0 filesystem.${LB_CHROOT_FILESYSTEM}"

				mkdir -p filesystem.tmp
				mount -o loop chroot/filesystem.${LB_CHROOT_FILESYSTEM} filesystem.tmp
				cp -a chroot/chroot/* filesystem.tmp

				if $FAKE_MTAB; then
					Chroot chroot "rm -f /etc/mtab"
				fi

				umount filesystem.tmp
				rmdir filesystem.tmp

				# Move image
				mv chroot/filesystem.${LB_CHROOT_FILESYSTEM} binary/${INITFS}

				du -B 1 -s chroot/chroot | cut -f1 > binary/${INITFS}/filesystem.size

				# Removing depends
				Remove_packages
				
				if [ -e chroot/chroot.cache ]
				then
					Remove_lockfile
					mv chroot/chroot chroot.tmp

					lb chroot_prep remove all mode-archives-binary "${@}"

					rm -rf chroot
					mv chroot.tmp chroot

					lb chroot_prep install all mode-archives-binary "${@}"

					touch .lock
				else
					rm -rf chroot/chroot
				fi
				;;

			false)
				dd if=/dev/zero of=binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM} bs=1024k count=0 seek=${REAL_DIM}
				mkfs.${LB_CHROOT_FILESYSTEM} -F -b 1024 -N ${REAL_INODES} -m 0 binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM}

				mkdir -p filesystem.tmp
				mount -o loop binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM} filesystem.tmp
				cp -a chroot/* filesystem.tmp

				umount filesystem.tmp
				rmdir filesystem.tmp
				;;
		esac

		# Saving cache
		Save_package_cache binary
		;;

	jffs2)
		# Checking depends
		Check_package chroot /usr/sbin/mkfs.jffs2 mtd-tools

		# Restoring cache
		Restore_package_cache binary

		# Installing depends
		Install_packages

		# Remove old jffs2 image
		if [ -f binary/${INITFS}/filesystem.jffs2 ]
		then
			rm -f binary/${INITFS}/filesystem.jffs2
		fi

		if [ -n "${LB_JFFS2_ERASEBLOCK}" ]
		then
			JFFS2_OPTIONS="--eraseblock=${LB_JFFS2_ERASEBLOCK}"
		fi

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				Chroot chroot "mkfs.jffs2 ${JFFS2_OPTIONS} --root=chroot --output filesystem.jffs2"

				# Move image
				mv chroot/filesystem.jffs2 binary/${INITFS}

				# Removing depends
				Remove_packages

				if [ -e chroot/chroot.cache ]
				then
					Remove_lockfile
					mv chroot/chroot chroot.tmp

					lb chroot_prep remove all mode-archives-binary "${@}"

					rm -rf chroot
					mv chroot.tmp chroot

					lb chroot_prep install all mode-archives-binary "${@}"

					touch .lock
				else
					rm -rf chroot/chroot
				fi
				;;

			false)
				mkfs.jffs2 ${JFFS2_OPTIONS} --root=chroot --output binary/${INITFS}/filesystem.jffs2
				;;
		esac

		# Saving cache
		Save_package_cache binary
		;;

	plain)
		if [ -d binary/${INITFS}/filesystem.dir ]
		then
			rm -rf binary/${INITFS}/filesystem.dir
		fi

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				if [ -e chroot/chroot.cache ]
				then
					# Different from the other LB_CHROOT_FILESYSTEM values:
					# continue working in the bootstrap chroot, not the generated chroot.
					# This saves the time to create a full copy of the generated chroot.
					cp -a chroot/chroot/boot chroot
					mv chroot/chroot binary/${INITFS}/filesystem.dir
				else
					rm -fr chroot/chroot

					# Removing depends
					Remove_packages
				fi
				;;

			false)
				cp -a chroot binary/${INITFS}/filesystem.dir
				;;
		esac
		;;

	squashfs)
		# Checking depends
		Check_package chroot /usr/share/doc/squashfs-tools squashfs-tools

		# Restoring cache
		Restore_package_cache binary

		# Installing depends
		Install_packages

		Echo_message "Preparing squashfs image..."
		Echo_message "This may take a while."

		# Remove old squashfs image
		if [ -f binary/${INITFS}/filesystem.squashfs ]
		then
			rm -f binary/${INITFS}/filesystem.squashfs
		fi

		# Remove stale squashfs image
		rm -f chroot/filesystem.squashfs

		# Do not display progress bar if:
		# - Run with --quiet, or
		# - stdin is not a terminal (e.g. in CI, cron, etc)
		if [ "${_QUIET}" = "true" ] || [ ! -t 0 ]
		then
			MKSQUASHFS_OPTIONS="-no-progress ${MKSQUASHFS_OPTIONS}"
		fi

		if [ "${_VERBOSE}" = "true" ]
		then
			MKSQUASHFS_OPTIONS="-info ${MKSQUASHFS_OPTIONS}"
		fi

		if [ -f config/rootfs/squashfs.sort ]
		then
			MKSQUASHFS_OPTIONS="-sort squashfs.sort ${MKSQUASHFS_OPTIONS}"

			case "${LB_BUILD_WITH_CHROOT}" in
				true)
					cp -a config/rootfs/squashfs.sort chroot
					;;

				false)
					cp -a config/rootfs/squashfs.sort .
					;;
			esac
		fi

		# Set squashfs compression type or default to xz
		if [ -n "${LB_CHROOT_SQUASHFS_COMPRESSION_TYPE}" ]
		then 
			MKSQUASHFS_OPTIONS="-comp ${LB_CHROOT_SQUASHFS_COMPRESSION_TYPE} ${MKSQUASHFS_OPTIONS}"
		else 
			MKSQUASHFS_OPTIONS="-comp xz ${MKSQUASHFS_OPTIONS}"
		fi

		if [ -n "${LB_CHROOT_SQUASHFS_COMPRESSION_LEVEL}" ]
		then
			MKSQUASHFS_OPTIONS="-Xcompression-level ${LB_CHROOT_SQUASHFS_COMPRESSION_LEVEL} ${MKSQUASHFS_OPTIONS}"
		fi

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				if [ -e config/rootfs/excludes ]
				then
					cp -a config/rootfs/excludes chroot/excludes

					MKSQUASHFS_OPTIONS="-wildcards -ef /excludes ${MKSQUASHFS_OPTIONS}"
				fi

				# Create image
				Chroot chroot "nice -n 17 mksquashfs chroot filesystem.squashfs ${MKSQUASHFS_OPTIONS}"

				rm -f chroot/excludes

				# Move image
				mv chroot/filesystem.squashfs binary/${INITFS}
				rm -f chroot/squashfs.sort

				# Removing depends
				Remove_packages

				if [ -e chroot/chroot.cache ]
				then
					Remove_lockfile
					mv chroot/chroot chroot.tmp

					lb chroot_prep remove all mode-archives-binary "${@}"

					rm -rf chroot
					mv chroot.tmp chroot

					lb chroot_prep install all mode-archives-binary "${@}"

					touch .lock
				else
					rm -rf chroot/chroot
				fi
				;;

			false)
				if [ -e config/rootfs/excludes ]
				then
					MKSQUASHFS_OPTIONS="-wildcards -ef config/rootfs/excludes ${MKSQUASHFS_OPTIONS}"
				fi

				nice -n 19 mksquashfs chroot binary/${INITFS}/filesystem.squashfs ${MKSQUASHFS_OPTIONS}
				;;
		esac

		chmod 0644 binary/${INITFS}/filesystem.squashfs

		# Saving cache
		Save_package_cache binary
		;;

	none)
		if [ -d binary ]
		then
			rm -rf binary
		fi

		case "${LB_BUILD_WITH_CHROOT}" in
			true)
				mv chroot/chroot binary
				;;

			false)
				Echo_message "This may take a while."
				cp -a chroot binary
				;;
		esac
		;;

esac

if In_list "rootfs" ${LB_CACHE_STAGES}
then
	rm -rf cache/binary_rootfs

	mkdir -p cache/binary_rootfs

	if [ "${LB_CHROOT_FILESYSTEM}" != "none" ]
	then
		cp -a binary/"${INITFS}"/filesystem.* cache/binary_rootfs
	fi
fi

# Creating stage file
Create_stagefile
