Jestson Nano自定义根文件系统创建（支持NVIDIA图形库的最小根文件系统）

前面两篇，我们通过裁剪内核，构造了一个自定义内核，但是官方的根文件系统太大，有13G之多，而nano的emmc版本带的flash只有16gb，所以，根文件系统的裁剪势在必行。基于此，我们根据ubuntu基本的根文件创建自己的自定义文件系统。
整个过程我参考官网论坛的一些资料，做成了两个脚本，直接放在一个目录里面运行

sudo ./make_rootfs

即可在当前目录下的build目录下生成根文件系统，将build目录下的所有文件复制到/Linux_for_Tegra/rootfs目录下，运行以下指令：

cd ..
sudo ./apply_binaries.sh

这一步是用来安装NVIDIA的图形加速库，如果不运行，就失去了用这个板子的意义。

后面直接运行flash.sh脚本烧录即可！（烧录方法参见前两篇）
脚本：make_rootfs.sh

#!/bin/bash

URL_ROOTFS_TGZ_BASE=http://cdimage.ubuntu.com/ubuntu-base/releases/18.04/release/ubuntu-base-18.04.5-base-arm64.tar.gz

if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi

SOURCE_DIR="$( cd "$( dirname "${
       BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" BUILD_DIR=$SOURCE_DIR/build rm -r $BUILD_DIR mkdir -p $BUILD_DIR cd $BUILD_DIR # download and extract rootfs wget -O rootfs.tar.gz $URL_ROOTFS_TGZ_BASE tar -xpf rootfs.tar.gz rm rootfs.tar.gz # chroot to rootfs QEMU_PATH=/usr/bin/qemu-aarch64-static if [ ! -f "$FILE" ]; then apt-get install qemu-user-static fi cp $QEMU_PATH $BUILD_DIR/usr/bin/ mount /sys $BUILD_DIR/sys -o bind mount /proc $BUILD_DIR/proc -o bind mount /dev $BUILD_DIR/dev -o bind mv $BUILD_DIR/etc/resolv.conf $BUILD_DIR/etc/resolv.conf.saved cp /etc/resolv.conf $BUILD_DIR/etc cp $SOURCE_DIR/install.sh $BUILD_DIR/ LC_ALL=C chroot $BUILD_DIR /bin/bash -c ./install.sh rm $BUILD_DIR/install.sh echo "<================We are unmounting==============>"
umount $BUILD_DIR/sys
umount $BUILD_DIR/proc
umount $BUILD_DIR/dev

mv $BUILD_DIR/etc/resolv.conf.saved $BUILD_DIR/etc/resolv.conf

rm $BUILD_DIR/usr/bin/qemu-aarch64-static
rm -rf $BUILD_DIR/var/lib/apt/lists/*
rm -rf $BUILD_DIR/dev/*
rm -rf $BUILD_DIR/var/log/*
rm -rf $BUILD_DIR/var/tmp/*
rm -rf $BUILD_DIR/var/cache/apt/archives/*.deb
rm -rf $BUILD_DIR/tmp/*

脚本：intstall.sh
有一点需要指出的是，我们增加用户的时候，一般的在命令行直接输入useradd ，然后输入密码，其实可以通过openssl直接设置密码。

useradd -p 密码

只不过这里的密码必须是密文，也就是，我们先通过openssl passwd -crypt来设置密码，然后将密文传入作为p的参数。即

PASSWORD=$(openssl passwd -crypt)
useradd -m -p $PASSWORD -s /bin/bash careray

上面的命令即会按照输入的明文密码，加密后添加用户careray。

#!/bin/bash

# update apt cache
apt-get update

# create user
apt-get install -y openssl
echo "Please provide the default password for the user:"
PASSWORD=$(openssl passwd -crypt)
useradd -m -p $PASSWORD -s /bin/bash careray
usermod -aG sudo careray

# install openssh
apt-get install -y openssh-server

# remove old docker version
apt-get remove \
    docker \
    docker-engine \
    docker.io \
    containerd \
    runc

# install dependencies
apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    binfmt-support \
    device-tree-compiler \
    libasound2 \
    libcairo2 \
    libdatrie1 \
    libegl1 \
    libegl1-mesa \
    libevdev2 \
    libfontconfig1 \
    libgles2 \
    libgstreamer-plugins-base1.0-0 \
    libgstreamer1.0-0 \
    libgtk-3-0 \
    libharfbuzz0b \
    libinput10 \
    libjpeg-turbo8 \
    libpixman-1-0 \
    libpangocairo-1.0-0 \
    libpangoft2-1.0-0 \
    libpng16-16 \
    libssl-dev \
    libunwind8 \
    libwayland-cursor0 \
    libwayland-egl1 \
    libx11-6 \
    libxext6 \
    libxkbcommon0 \
    libxrender1 \
    locales \
    locate \
    nano \
    network-manager \
    openssh-server \
    openssl \
    python \
    python3 \
    python3-pip \
    sudo \
    v4l-utils \
    software-properties-common

# We are required to provide libffi6
wget http://ftp.de.debian.org/debian/pool/main/libf/libffi/libffi6_3.2.1-9_arm64.deb
dpkg --install libffi6_3.2.1-9_arm64.deb

# This has no installation candidate
wget http://ports.ubuntu.com/pool/universe/g/gst-plugins-bad1.0/libgstreamer-plugins-bad1.0-0_1.14.0-1ubuntu1_arm64.deb
dpkg --install libgstreamer-plugins-bad1.0-0_1.14.0-1ubuntu1_arm64.deb

# add docker gpg key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
apt-key fingerprint 0EBFCD88

# #Install multimedia packages
# wget https://repo.download.nvidia.com/jetson/t210/pool/main/n/nvidia-l4t-multimedia/nvidia-l4t-multimedia_32.6.1-20210916211029_arm64.deb
# dpkg --install nvidia-l4t-multimedia/nvidia-l4t-multimedia_32.6.1-20210916211029_arm64.deb

# #Install gstreamer_32
# wget https://repo.download.nvidia.com/jetson/t210/pool/main/n/nvidia-l4t-gstreamer/nvidia-l4t-gstreamer_32.6.1-20210916211029_arm64.deb
# dpkg --install nvidia-l4t-gstreamer_32.6.1-20210916211029_arm64.deb

# add docker repo and install
add-apt-repository \
   "deb [arch=arm64] https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) \ stable"
apt-get update
apt-get install -y \
    docker-ce \
    docker-ce-cli \
    containerd.io

# add user to docker group
usermod -aG docker careray 
systemctl set-default multi-user.target

脚本里面的一些下载网址可能会随着官方更新而下载失败，请自行更新！