debootstrap折腾

安装

sudo apt-get install debootstrap

下载rootfs

debootstrap --no-check-gpg --arch=amd64 --include=vim,ca-certificates,net-tools,iputils-ping,iputils-tracepath,iproute,bash,aptitude,locales-all,openssh-server,openssh-client jessie debian-jessie http://mirrors.ustc.edu.cn/debian

这里用的jessie，其实就是 debian 8， 是一个比较就的稳定版

尝试下载 stretch（debian 9）和 buster（debian 10）， 发现最高只能到9。  10下载的不完整，有问题。 难道是源的问题？

james@james-virtual-machine:~/x86/debootstrap/test$ ls debian*
debian10:
debootstrap  var

debian9:
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

chroot

用下面脚本

./ch-mount.sh -m jessie

是可以用的。

下载内核：

apt-get install linux-image-amd64

解压内核

参考https://access.redhat.com/solutions/24029

cd /boot

zcat initrd.img-3.16.0-6-amd64 | cpio -idmv

打包内核：

find . | cpio -o -c -R root:root | gzip -9 > /boot/new.img

分析 /init

vi init

启动后会去挂载真实的root

具体分析见另一篇文章

查看debian版本：

cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL=https://bugs.debian.org/

chroot-mnt.sh 脚本

#!/bin/bash

function mnt() {

echo "MOUNTING"

sudo mount -t proc /proc ${2}proc

sudo mount -t sysfs /sys ${2}sys

sudo mount -o bind /dev ${2}dev

sudo mount -o bind /dev/pts ${2}dev/pts

sudo chroot ${2}

}

function umnt() {

echo "UNMOUNTING"

sudo umount ${2}proc

sudo umount ${2}sys

sudo umount ${2}dev/pts

sudo umount ${2}dev

}

if [ "$1" == "-m" ] && [ -n "$2" ] ;

then

mnt $1 $2

elif [ "$1" == "-u" ] && [ -n "$2" ];

then

umnt $1 $2

else

echo ""

echo "Either 1'st, 2'nd or both parameters were missing"

echo ""

echo "1'st parameter can be one of these: -m(mount) OR -u(umount)"

echo "2'nd parameter is the full path of rootfs directory(with trailing '/')"

echo ""

echo "For example: ch-mount -m /media/sdcard/"

echo ""

echo 1st parameter : ${1}

echo 2nd parameter : ${2}

fi