mirror of
https://github.com/adron-s/mtik_initrd_hacks.git
synced 2025-12-10 07:44:40 +01:00
26f20be410
Unpacking the 7.0b1 npk file into its parts and pack it back work fine. But the fake /init does not start. Perhaps some additional compilation flags are required.
105 lines
2.6 KiB
Bash
Executable file
105 lines
2.6 KiB
Bash
Executable file
#!/bin/sh
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#
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#(C) Sergey Sergeev aka adron, 2019
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#
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_kernel_bin_binwalk=""
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kernel_bin_binwalk(){
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[ -z "${_kernel_bin_binwalk}" ] && \
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_kernel_bin_binwalk=$(binwalk ./bins/kernel.bin)
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echo "${_kernel_bin_binwalk}"
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}
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get_xz_offsets(){
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kernel_bin_binwalk | grep "xz compressed data" | sed -n 's/^\([0-9]\+\).*/\1/p'
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}
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get_file_size(){
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[ -f ${1} ] || {
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echo 0
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return 0
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}
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du -b ${1} | sed -e 's/\([0-9]\+\).*/\1/'
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}
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unpack_kernel_bin(){
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local xz_offsets
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local p_count=0
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local pred_offset
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local size
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local offset
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xz_offsets=$(get_xz_offsets)
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for offset in ${xz_offsets} 0; do
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#echo $offset
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[ -n "${pred_offset}" ] && {
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p_count=$((${p_count}+1))
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size=$((${offset}-${pred_offset}))
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[ ${offset} -eq 0 ] && size=104857600
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echo "$p_count - ${pred_offset} - ${size}"
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dd if=./bins/kernel.bin of=./bins/kernel.p${p_count}.xz bs=1 skip=${pred_offset} count=${size}
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}
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pred_offset=${offset}
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done
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}
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extract_kernel_elf(){
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local offsets
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local offset
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local kernel_elf_size=0
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offsets=`kernel_bin_binwalk | sed -n 's/ELF,//p' | sed -n 's/^\([0-9]\+\).*/\1/p'`
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local elf_last_offset
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local first_xz_offset
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for offset in ${offsets}; do
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elf_last_offset=${offset}
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done
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[ -n "${elf_last_offset}" ] && {
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offsets=$(get_xz_offsets)
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for offset in ${offsets}; do
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first_xz_offset=${offset}
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break
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done
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#elf size without xz
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kernel_elf_size=$((${first_xz_offset}-${elf_last_offset}))
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local p
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local size
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for p in $(seq 1 3); do
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size=$(get_file_size ./bins/kernel.p${p}.xz)
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kernel_elf_size=$((${kernel_elf_size}+${size}))
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done
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dd if=./bins/kernel.bin bs=1 skip=${elf_last_offset} count=${kernel_elf_size} of=./bins/kernel.elf
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[ -f ./bins/p3-garbage.bin ] && {
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offset=484 #[ 45 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 ] <-- ${offset}
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dd if=./bins/p3-garbage.bin bs=${offset} count=1 >> ./bins/kernel.elf
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}
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}
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}
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truncate_kernel_p3(){
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local garbage_size
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local p3_size
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garbage_size=$(get_file_size ./bins/p3-garbage.bin)
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p3_size=$(get_file_size ./bins/kernel.p3.xz)
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dd if=./bins/kernel.p3.xz of=./bins/kernel.p3-stripped.xz bs=$((${p3_size}-${garbage_size})) count=1
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cat ./bins/kernel.p3-stripped.xz > ./bins/kernel.p3.xz
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rm ./bins/kernel.p3-stripped.xz
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}
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extract_kernel_cpiofs(){
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local ROOT=$(pwd)
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rm -Rf ./cpio-fs
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mkdir ./cpio-fs
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cd ./cpio-fs
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xzcat ${ROOT}/bins/kernel.p3.xz | cpio -idv
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}
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unpack_kernel_bin
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( xz -dc --single-stream > ./bins/initramfs.cpio && cat > ./bins/p3-garbage.bin ) < ./bins/kernel.p3.xz
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#do kerne.p3.xz fix(cut garbage)
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[ -f ./bins/p3-garbage.bin ] && {
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truncate_kernel_p3
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}
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extract_kernel_elf
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#extract_kernel_cpiofs
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