build_action.sh

#!/usr/bin/env bash

# 这一步用于从脚本同目录下的 config 文件中获取要编译的内核版本号
LINUX_VERSION=$(grep 'Kernel Configuration' < config | awk '{print $3}')

# add deb-src to sources.list Ubuntu系统只需要把系统 apt 配置中的源码仓库注释取消掉即可
sed -i "/deb-src/s/# //g" /etc/apt/sources.list

# 安装依赖
apt update
apt full-upgrade -y
apt install -y wget git xz-utils rsync python3 build-essential bc kmod cpio flex libncurses5-dev libelf-dev libssl-dev dwarves bison
apt build-dep -y linux

# 将目录更改为工作场所
cd ${GITHUB_WORKSPACE} || exit

# 下载内核源码
wget -q https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-${LINUX_VERSION}.tar.xz -O - | tar xJ
cd linux-${LINUX_VERSION} || exit

# 复制配置文件
cp ../config .config
cp ../debian-uefi-certs.pem certs/

# 禁用 DEBUG_INFO 以加速构建
#从内核 5.18+ 开始，还需要启用DEBUG_INFO_NONE
scripts/config --disable DEBUG_INFO
scripts/config --undefine GDB_SCRIPTS
scripts/config --undefine DEBUG_INFO_SPLIT
scripts/config --undefine DEBUG_INFO_REDUCED
scripts/config --undefine DEBUG_INFO_COMPRESSED
scripts/config --enable DEBUG_INFO_NONE
scripts/config --disable DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
scripts/config --disable DEBUG_INFO_DWARF4
scripts/config --disable DEBUG_INFO_DWARF5
# 其他
scripts/config --set-val CONFIG_BUILD_SALT ${LINUX_VERSION}-amd64
scripts/config --set-val CONFIG_SYSTEM_TRUSTED_KEYS ${PWD}/certs/debian-uefi-certs.pem

# 应用 patch.d/ 目录下的脚本，用于自定义对系统源码的修改
source ../patch.d/*.sh

# 构建 deb 包
# 获取系统的 CPU 核心数，将核心数X2设置为编译时开启的进程数，以加快编译速度
CPU_CORES=$(($(grep -c processor < /proc/cpuinfo)*2))
#make deb-pkg -j${CPU_CORES}
fakeroot make -j${CPU_CORES} bindeb-pkg LOCALVERSION=-mejituu KDEB_PKGVERSION=$(make kernelversion)-1 ARCH=x86_64 1>/dev/null

# 将 deb 包移动到 mejituu 目录
cd ..
rm -rf linux-${LINUX_VERSION}
mkdir mejituu && chown -R $USER:$GROUPS mejituu && chgrp -R $USER:$GROUPS mejituu && chmod -R 777 mejituu || exit
mv *.deb mejituu/