Convert antix live USB to f2fs

antix_f2fs.sh

#!/bin/bash

if [ $# -ne 1 ] || ! [ -b $1 ]; then
	echo Usage:
	echo $(basename $0) boot_part
	exit 1
fi

if [ $(whoami) != root ]; then
	echo you are not root
	exit 1
fi

old_wd=$(pwd)
boot_part=$1
crypt_part=
loop_dev=
tmp_dir=$(mktemp -d)
mapper_name=$(head -c 5 /dev/urandom | base32)

function clean_exit() {
	# ====
	echo Cleaning up

	cd $old_wd

	if ! [ -z "$loop_dev" ]; then
		umount $tmp_dir/root
		losetup -d $loop_dev
	fi

	if ! [ -z "$crypt_part" ]; then
		umount $tmp_dir/crypt

		cryptsetup close $mapper_name
	fi

	umount $tmp_dir/boot

	[ -d $tmp/initrd ] && rm -rf $tmp_dir/initrd
	rm -rf $tmp_dir/crypt_copy
	
	[ -f $tmp_dir/initrd.gz ] && rm $tmp_dir/initrd.gz
	[ -f $tmp_dir/initrd.gz.md5 ] && rm $tmp_dir/initrd.gz.md5

	rmdir $tmp_dir/root
	rmdir $tmp_dir/crypt
	rmdir $tmp_dir/boot

	rmdir $tmp_dir

	exit $@
}

# ====
echo Preparing

mkdir $tmp_dir/boot
mkdir $tmp_dir/crypt
mkdir $tmp_dir/root
mkdir $tmp_dir/crypt_copy

mount $boot_part $tmp_dir/boot \
	|| clean_exit $?
crypt_part=/dev/disk/by-uuid/$(cat $tmp_dir/boot/antiX/encrypted) \
	|| clean_exit $?
[ -b "$crypt_part" ] \
	|| (echo Can not find encrypted partition $crypt_part; exit 1)

cryptsetup --key-file=$tmp_dir/boot/antiX/passphrase open $crypt_part $mapper_name \
	|| cryptsetup open $crypt_part $mapper_name \
	|| clean_exit $?

mount /dev/mapper/$mapper_name $tmp_dir/crypt \
	|| clean_exit $?

loop_dev=$(losetup --find --show $tmp_dir/crypt/antiX/linuxfs)
mount $loop_dev $tmp_dir/root \
	|| clean_exit $?

# ====
# Patching initrd

function patch_initrd() {
	initrd=$1
	echo Patching initrd $initrd

	mkdir $tmp_dir/initrd
	cd $tmp_dir/initrd
	zcat $initrd | cpio -i \
		|| clean_exit $?
	kernel_name=$(ls -d lib/modules/* | tail -n 1 | sed 's/.*\///')
	cd $tmp_dir/root
	for f in \
		crypto/crc32_generic.ko \
		arch/x86/crypto/crc32-pclmul.ko
	do
		f=lib/modules/$kernel_name/kernel/$f
		cp -v $f $tmp_dir/initrd/$f \
			|| clean_exit $?
	done
	# find lib/modules/$kernel_name -type f -name 'crc32*' | while read f; do
	# 	cp -v $f $tmp_dir/initrd/$f \
	# 		|| clean_exit $?
	# done

	cd $tmp_dir/initrd
	find . | cpio -H newc -o | gzip > $tmp_dir/initrd.gz
	cd $tmp_dir
	md5sum initrd.gz > initrd.gz.md5 \
		|| clean_exit $?
	mv -v initrd.gz $initrd \
		|| clean_exit $?
	mv -v initrd.gz.md5 ${initrd}.md5 \
		|| clean_exit $?
	rm -rf initrd
}

patch_initrd $tmp_dir/boot/antiX/initrd.gz
patch_initrd $tmp_dir/crypt/antiX/initrd.gz

# ====
echo Reformatting encrypted partition

umount $tmp_dir/root
losetup -d $loop_dev
loop_dev=

rsync -raP $tmp_dir/crypt/* $tmp_dir/crypt_copy/ \
	|| clean_exit $?
umount $tmp_dir/crypt \
	|| clean_exit $?
crypt_label=$(blkid -s LABEL -o value /dev/mapper/$mapper_name) \
	|| clean_exit $?
mkfs.f2fs -f -l "$crypt_label" /dev/mapper/$mapper_name \
	|| clean_exit $?
mount /dev/mapper/$mapper_name $tmp_dir/crypt \
	|| clean_exit $?
rsync -raP $tmp_dir/crypt_copy/* $tmp_dir/crypt/ \
	|| clean_exit $?

# ====
clean_exit