Jestson nano custom root file system creation (supports the smallest root file system of NVIDIA Graphics Library)

The first two , We cut the kernel , Constructed a custom kernel , But the official root file system is too large , Yes 13G As much as , and nano Of emmc Version with flash Only 16gb, therefore , Tailoring the root file system is imperative . Based on this , We according to the ubuntu Basic root files create your own custom file system .
In the whole process, I refer to some information on the official website forum , Made two scripts , Run directly in a directory

sudo ./make_rootfs

In the current directory build Generate root file system under directory , take build Copy all files in the directory to /Linux_for_Tegra/rootfs Under the table of contents , Run the following command ：

cd ..
sudo ./apply_binaries.sh

This step is used to install NVIDIA Graphics acceleration Library , If it doesn't work , It loses the meaning of using this board .

Run directly later flash.sh Script burning is enough ！（ See the previous two articles for the burning method ）
Script ：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/*

Script ：intstall.sh
One thing to point out is , When we add users , Generally, input directly on the command line useradd , Then enter the password , You can actually go through openssl Set password directly .

useradd -p  password 

But the password here must be ciphertext , That is to say , Let's go through openssl passwd -crypt To set the password , Then pass the ciphertext in as p Parameters of . namely

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

The above command will follow the input plaintext password , Add user after encryption 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

Some download URLs in the script may fail to download with the official update , Please update yourself ！