smart-os/02_build_img.sh

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#!/bin/sh
red='\e[0;41m' # 红色
RED='\e[1;31m'
green='\e[0;32m' # 绿色
GREEN='\e[1;32m'
yellow='\e[5;43m' # 黄色
YELLOW='\e[1;33m'
blue='\e[0;34m' # 蓝色
BLUE='\e[1;34m'
purple='\e[0;35m' # 紫色
PURPLE='\e[1;35m'
cyan='\e[4;36m' # 蓝绿色
CYAN='\e[1;36m'
WHITE='\e[1;37m' # 白色
NC='\e[0m' # 没有颜色
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# 导入公共环境
. ./common.sh
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#----------------------------------------------
#
# 进行目录瘦身
#
#----------------------------------------------
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./mk_strip.sh
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#----------------------------------------------
#
# 制作磁盘
#
#----------------------------------------------
echo "${CYAN}--- build disk --- ${NC}"
# 创建磁盘 64M
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if [ "${with_gcc}" = false ]; then
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dd if=/dev/zero of=disk.img bs=1M count=128
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else
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dd if=/dev/zero of=disk.img bs=1M count=256
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fi
# 对磁盘进行分区一个主分区
fdisk disk.img << EOF
n
p
w
EOF
echo "${GREEN}+++ build disk ok +++${NC}"
# 磁盘镜像挂载到具体设备
loop_dev=$(losetup -f)
# fdisk -l disk.img 查看 start 为 2048, unit 512 所以 -o 偏移扇区 1048576 = 2048 x 512
losetup -o 1048576 ${loop_dev} disk.img
# 对磁盘进行格式化
mkfs.ext3 ${loop_dev}
diskfs="diskfs"
# 挂载磁盘到本地目录
mkdir -pv ${diskfs}
mount -t ext3 ${loop_dev} ${diskfs}
# 安装grub 引导
grub-install --boot-directory=${diskfs}/boot/ --target=i386-pc --modules=part_msdos disk.img
#---------------------------------------------
#
# 制作内核和 rootfs
#
#---------------------------------------------
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rm -rf rootfs
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mkdir -pv rootfs
mkdir -pv rootfs/dev
mkdir -pv rootfs/etc
mkdir -pv rootfs/sys
mkdir -pv rootfs/mnt
mkdir -pv rootfs/tmp
mkdir -pv rootfs/lib
mkdir -pv rootfs/sbin
mkdir -pv rootfs/proc
mkdir -pv rootfs/root
mkdir -pv rootfs/lib64
mkdir -pv rootfs/lib/modules
# 拷贝内核镜像
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cp ${linux_install}/bzImage ${diskfs}/boot/bzImage
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# 拷贝 glibc 到 rootfs
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cp ${glibc_install}/* rootfs/ -r
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rm -rf rootfs/var/db
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rm -rf rootfs/share
rm -rf rootfs/usr/share
find rootfs/ -name "*.a" -exec rm -rf {} \;
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# 编译的镜像带有 gcc 编译器
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if [ "${with_gcc}" = false ]; then
rm -rf rootfs/usr/include
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else
echo "${RED} with-gcc tools --- you can build your world${NC}"
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cp ${glibc_install}/usr/lib64/libc_nonshared.a rootfs/usr/lib64
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fi
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#----------------------------------------------------------------------
# 这个解释器必须设置对,否则系统会启动时 crash, 导致启动失败 !!!!!!
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# 这个现在 glibc 编译时,已经自动生成,先注释掉
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#-----------------------------------------------------------------------
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# ln -s /lib/ld-2.32.so rootfs/lib64/ld-linux-x86-64.so.2
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# 拷贝 busybox 到 rootfs
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cp ${busybox_install}/* rootfs/ -r
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#-----------------------------------------------
#
# 制作启动文件系统 initramfs
#
#-----------------------------------------------
cd rootfs
echo "${CYAN}--- build initrd ---${NC}"
# 这种方法也可以 mkinitramfs -k -o ./${diskfs}/boot/initrd 4.14.9
# 利用 Busybox 采用脚本制作 init 脚本 https://blog.csdn.net/embeddedman/article/details/7721926
make_init() {
cat<<"EOF">init
#!/bin/sh
# 必须首先挂载,否则 mdev 不能正常工作
mount -t sysfs none /sys
mount -t proc none /proc
mount -t devtmpfs none /dev
mount -t tmpfs none /tmp -o mode=1777
# 必须挂载一下,否则下面的 mount 不上
mdev -s
mount -t ext3 /dev/sda1 /mnt
# 关闭内核烦人的输出信息
echo 0 > /proc/sys/kernel/printk
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# 热插拔处理都交给 mdev
echo /sbin/mdev > /proc/sys/kernel/hotplug
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echo -e "\n\e[0;32mBoot took $(cut -d' ' -f1 /proc/uptime) seconds\e[0m"
mkdir -p /dev/pts
mount -t devpts none /dev/pts
# 切换之前,修改 mount 路径
mount --move /dev /mnt/dev
mount --move /sys /mnt/sys
mount --move /proc /mnt/proc
mount --move /tmp /mnt/tmp
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# 切换到真正的磁盘系统上 rootfs ---> diskfs
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exec switch_root /mnt /sbin/init
EOF
# /sbin/init [switch_root 执行] ---> /etc/inittab [定义了启动顺序] --->
# /etc/init.d/rcS [系统 mount, 安装驱动,配置网络] --->
# /etc/init.d/rc.local [文件配置应用程序需要的环境变量] ---> /etc/profile [部分初始化]
chmod +x init
}
make_init
# 下面这些不用了,利用脚本里面的 busybox 的 mdev -s 自动挂载
# mknod -m 644 dev/tty0 c 4 1
# mknod -m 644 dev/tty c 5 0
# mknod -m 600 dev/console c 5 1
# mknod -m 644 dev/null c 1 3
# mknod -m 640 dev/sda1 b 8 1
# 指定了利用 /etc/init.d/rcS 启动
cat<<"EOF">etc/inittab
::restart:/sbin/init
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
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::shutdown:/sbin/swapoff -a
::sysinit:echo "sysinit 1++++++++++++++++++++++++++++++++++++++"
::sysinit:/etc/init.d/rcS
::sysinit:echo "sysinit 2++++++++++++++++++++++++++++++++++++++"
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tty1::once:echo "hello smart-os tty1"
tty1::respawn:/bin/sh
tty2::once:echo "hello smart-os tty2"
tty2::respawn:/bin/sh
tty3::once:echo "hello smart-os tty3"
tty3::respawn:/bin/sh
EOF
find . | cpio -R root:root -H newc -o | gzip -9 > ../${diskfs}/boot/initrd
echo "${GREEN}+++ build initrd ok +++${NC}"
cd ..
#--------------------------------------------------------------
#
# 生成磁盘文件系统(利用 busybox 结构,省的自己创建了)
#
#--------------------------------------------------------------
echo "${CYAN}--- build diskfs ---${NC}"
cp rootfs/* ${diskfs} -r
# 带有 gcc 编译器
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if [ "${with_gcc}" = true ]; then
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echo "${RED} with-gcc tools --- you can build your world${NC}"
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cp ${gcc_install}/* ${diskfs} -r
cp ${binutils_install}/usr/x86_64-pc-linux-gnu/* ${diskfs} -r
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fi
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rm -rf ${diskfs}/init ${diskfs}/lost+found
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# 测试用户登陆模式: root/123456
if [ "${with_login}" = true ]; then
echo "${RED} with-login --- it's an exciting time ${NC}"
./mk_login.sh ${diskfs}
fi
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# 我们测试驱动, 制作的镜像启动后,我们进入此目录 insmod hello_world.ko 即可
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./mk_drv.sh $(pwd)/${diskfs}/lib/modules
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# 编译网卡驱动 ( 目前版本内核已集成 e1000 )
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# cd ${build_dir}/linux-4.14.9 && make M=drivers/net/ethernet/intel/e1000/ && cd ../..
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# 生成 grub.cfg 文件, 增加 console=ttyS0 就会让 qemu 输出日志到 qemu.log
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cat - > ${diskfs}/boot/grub/grub.cfg << EOF
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set timeout=3
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menuentry "smart-os" {
root=(hd0,msdos1)
linux /boot/bzImage console=tty0
initrd /boot/initrd
}
EOF
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# 生成 /etc/resolv.conf 文件
cat -> ${diskfs}/etc/resolv.conf << EOF
nameserver 8.8.8.8
nameserver 114.114.114.114
EOF
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# 生成 /etc/init.d/rcS 文件
title=$(cat<<EOF
\e[0;36m
..######..##.....##....###....########..########..........#######...######.
.##....##.###...###...##.##...##.....##....##............##.....##.##....##
.##.......####.####..##...##..##.....##....##............##.....##.##......
..######..##.###.##.##.....##.########.....##....#######.##.....##..######.
.......##.##.....##.#########.##...##......##............##.....##.......##
.##....##.##.....##.##.....##.##....##.....##............##.....##.##....##
..######..##.....##.##.....##.##.....##....##.............#######...######.
\e[0m
EOF
)
mkdir -pv ${diskfs}/etc/init.d
cat - > ${diskfs}/etc/init.d/rcS << EOF
#!/bin/sh
echo -e "\n“${title}”\n"
# 测试驱动加载
cd /lib/modules && insmod hello_world.ko
# dns 测试 busybox 必须动态编译 动态编译 glibc 已经集成 dns 功能
ifconfig eth0 192.168.100.6 && ifconfig eth0 up
route add default gw 192.168.100.1
# exec 执行 /etc/init.d/rc.local 脚本
EOF
chmod +x ${diskfs}/etc/init.d/rcS
echo "${GREEN}+++ build diskfs ok +++${NC}"
# 卸载映射
umount ${loop_dev}
losetup -d ${loop_dev}
#---------------------------------------------------------------
#
# 查看磁盘内容
#
#---------------------------------------------------------------
./cat_img.sh
echo "Run the next script: 03_run_qemu.sh or 04_run_docker.sh"