正点原子RK3588按需制作ubuntu rootfs

目前ubuntu主机是20.04,尝试基于24.04的base镜像制作rootfs出错，就又基于20.04的base做了。
安装正点原子的《ubuntu移植参考手册》

host安装qemu

配置rootfs的apt source.list

注意要用http，不能用https

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-security main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-updates main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-backports main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu-ports/ jammy main restricted universe multiverse

#准备 mount.sh

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
fi

挂载rootfs到主机

./mount.sh -m xx/ xx为镜像目录

apt update遇到问题

root@zxwl-OptiPlex-7070:/# apt update
Get:1 http://mirrors.aliyun.com/ubuntu-ports focal InRelease [265 kB]
Get:2 http://mirrors.aliyun.com/ubuntu-ports focal-security InRelease [128 kB]
Err:1 http://mirrors.aliyun.com/ubuntu-ports focal InRelease
  Couldn't create temporary file /tmp/apt.conf.kSonVN for passing config to apt-key
Err:2 http://mirrors.aliyun.com/ubuntu-ports focal-security InRelease
  Couldn't create temporary file /tmp/apt.conf.ObYn9U for passing config to apt-key
Get:3 http://mirrors.aliyun.com/ubuntu-ports focal-updates InRelease [128 kB]
Err:3 http://mirrors.aliyun.com/ubuntu-ports focal-updates InRelease
  Couldn't create temporary file /tmp/apt.conf.z5b3L5 for passing config to apt-key
Get:4 http://mirrors.aliyun.com/ubuntu-ports focal-backports InRelease [128 kB]
Err:4 http://mirrors.aliyun.com/ubuntu-ports focal-backports InRelease
  Couldn't create temporary file /tmp/apt.conf.iueape for passing config to apt-key
Reading package lists... Done
W: GPG error: http://mirrors.aliyun.com/ubuntu-ports focal InRelease: Couldn't create temporary file /tmp/apt.conf.kSonVN for passing config to apt-key
E: The repository 'http://mirrors.aliyun.com/ubuntu-ports focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.aliyun.com/ubuntu-ports focal-security InRelease: Couldn't create temporary file /tmp/apt.conf.ObYn9U for passing config to apt-key

chmod 777 /tmp 就解决了

安装需要的软件

apt update
apt upgrade
apt install sudo 
sudo apt install openssh-server
sudo apt install libc6

apt install vim 
apt install net-tools 
apt install ethtool 
apt install ifupdown 
apt install iputils-ping
apt install openssh-server # ssh可以访问
apt install binutils #包含strings命令，可以查看glibc版本

umount

./mount.sh -u xx/ xx为镜像目录

make image

shell代码

#!/bin/bash
rootfs_dir=$1
rootfs_file=$2
rootfs_mnt="mnt"
if [ ! $rootfs_dir ] || [ ! $rootfs_file ]; 
  then 
    echo "Folder or target is empty."
    exit 0 
fi  
if [ -f "$rootfs_file" ]; then
  echo "-- Delete exist $rootfs_file ..."
  rm -f "$rootfs_file"
fi

echo "-- Create $rootfs_file ..."
dd if=/dev/zero of="$rootfs_file" bs=4M count=6144
sudo mkfs.ext4 -F -L linuxroot "$rootfs_file"
if [ ! -d "$rootfs_mnt" ]; then
  mkdir $rootfs_mnt
fi
echo "-- Copy data to $rootfs_file ..."
sudo mount $rootfs_file $rootfs_mnt
sudo cp -rfp $rootfs_dir/* $rootfs_mnt
sudo sync
sudo umount $rootfs_mnt
rm -r $rootfs_mnt
echo "-- Resize $rootfs_file ..."
/sbin/e2fsck -p -f "$rootfs_file"
/sbin/resize2fs -M "$rootfs_file"
echo "-- Done."