pack-kernel.sh

#!/usr/bin/env bash

# Variable for path to mobile-nix boot.img
mobile_nix_boot_img_path='./mobile-nix-boot.img'
# Variable for path to lineage boot.img (recovery)
lineage_boot_img_path='./lineage-boot.img'

# Variables for directory names to place extracted contents
lineage_out_dir='lineage-extracted'
mobile_nix_out_dir='mobile-nix-extracted'

## Clean up
rm -f "${lineage_out_dir}"/*
rm -f "${mobile_nix_out_dir}"/*
rm new-boot.img

## Create directories for extracted contents to go
mkdir -p "${lineage_out_dir}" 
mkdir -p "${mobile_nix_out_dir}" 

## Unpack boot.img
unpackbootimg -i "${lineage_boot_img_path}" -o "${lineage_out_dir}"
unpackbootimg -i "${mobile_nix_boot_img_path}" -o "${mobile_nix_out_dir}"

# Sort of working, gets out of fastboot
mkbootimg \
    --ramdisk "${mobile_nix_out_dir}"/mobile-nix-boot.img-ramdisk.gz \
    --cmdline "$(cat "${mobile_nix_out_dir}"/mobile-nix-boot.img-cmdline)" \
    --base "$(cat "${mobile_nix_out_dir}"/mobile-nix-boot.img-base)" \
    --pagesize "$(cat "${mobile_nix_out_dir}"/mobile-nix-boot.img-pagesize)" \
    --ramdisk_offset "$(cat "${mobile_nix_out_dir}"/mobile-nix-boot.img-ramdisk_offset)" \
    --tags_offset "$(cat "${mobile_nix_out_dir}"/mobile-nix-boot.img-tags_offset)" \
    --dtb "${lineage_out_dir}"/lineage-boot.img-dtb \
    --dtb_offset "$(cat "${lineage_out_dir}"/lineage-boot.img-dtb_offset)" \
    --header_version "$(cat "${lineage_out_dir}"/lineage-boot.img-header_version)" \
    --kernel "${lineage_out_dir}"/lineage-boot.img-zImage \
    --output new-boot.img