Ubuntu touch chroot ubuntu.

#!/bin/bash
time1="$( date +"%r" )"

install_ubuntu () {
    directory=ubuntu-fs
    UBUNTU_VERSION=20.04
    if [ -d "$directory" ];
    then
        first=1
        echo "[${time1}] [WARNING]: Skipping the download and the extraction, remove $directory to reinstall"
    elif [ -z "$(command -v proot)" ];
    then
        echo "[${time1}] [ERROR]:  Please install proot."
        echo ""
        exit 1
    elif [ -z "$(command -v wget)" ];
    then
        echo "[${time1}] [ERROR]:  Please install wget."
        echo ""
        exit 1
    fi
    if [ "$first" != 1 ];
    then
        if [ -f "ubuntu.tar.gz" ];
        then
            echo "# rm -rf ubuntu.tar.gz"
        fi
        if [ ! -f "ubuntu.tar.gz" ];then
            echo "[${time1}] [Installer thread/INFO]: Downloading the ubuntu rootfs, please wait..."
            ARCHITECTURE=$(dpkg --print-architecture)
            case "$ARCHITECTURE" in
                aarch64) ARCHITECTURE=arm64;;
                arm) ARCHITECTURE=armhf;;
                armhf) ARCHITECTURE=armhf;;
                amd64|x86_64) ARCHITECTURE=amd64;;
                *)
                    echo "[${time1}] [ERROR]:  Unknown architecture :- $ARCHITECTURE"
                    exit 1
                ;;
            esac
        wget http://cdimage.ubuntu.com/ubuntu-base/releases/${UBUNTU_VERSION}/release/ubuntu-base-${UBUNTU_VERSION}-base-${ARCHITECTURE}.tar.gz -O ubuntu.tar.gz 2>&1 | cat | grep "%" | tr "\n" "\r"
        echo "[${time1}] [Installer thread/INFO]:  Download complete!"
    fi
    cur=`pwd`
    mkdir -p $directory
    cd $directory
    echo "[${time1}] [Installer thread/INFO]:  Decompressing the ubuntu rootfs, please wait..."
    tar -zxf $cur/ubuntu.tar.gz --exclude='dev'||:
    echo "[${time1}] [Installer thread/INFO]:  The ubuntu rootfs have been successfully decompressed!"
    echo "[${time1}] [Installer thread/INFO]:  Fixing the resolv.conf, so that you have access to the internet"
    echo -n -e "nameserver 8.8.8.8\nnameserver 8.8.4.4\n" > etc/resolv.conf
    cd $cur
fi

bin=startubuntu.sh
echo "[${time1}] [Installer thread/INFO]:  Creating the start script, please wait...\n"
echo '#!/bin/bash' > $bin
# echo 'set -x' >> $bin
echo 'if [ "$EUID" -ne 0 ]' >> $bin
echo '    then echo "Please run as root"' >> $bin
echo '    exit' >> $bin
echo 'fi' >> $bin
echo '' >> $bin
echo 'dir="`pwd`/ubuntu-fs"' >> $bin
echo 'mkdir -p "$dir/dev/shm" 2>/dev/null' >> $bin
echo 'trap "umount \"$dir\"/tmp \"${dir}\"/dev/shm" EXIT INT TERM HUP PIPE &&' >> $bin
echo '    mount --bind /tmp "${dir}/tmp" && \' >> $bin
echo '    mount --bind /dev/shm "${dir}/dev/shm" && \' >> $bin
echo '    echo "Starting chroot!" && \' >> $bin
echo '    chroot "$dir"' >> $bin
echo 'umount \"$dir\"/tmp \"${dir}\"/dev/shm' >> $bin

echo "[${time1}] [Installer thread/INFO]:  The start script has been successfully created!"
echo "[${time1}] [Installer thread/INFO]:  Making startubuntu.sh executable please wait..."
chmod +x $bin
echo "[${time1}] [Installer thread/INFO]:  Successfully made startubuntu.sh executable"
echo "[${time1}] [Installer thread/INFO]:  Cleaning up please wait..."
rm ubuntu.tar.gz -rf
echo "[${time1}] [Installer thread/INFO]:  Successfully cleaned up!"
echo "[${time1}] [Installer thread/INFO]:  The installation has been completed! You can now launch Ubuntu with ./startubuntu.sh"
echo ""

}
if [ "$1" = "-y" ];then
    install
elif [ "$1" = "" ];then
printf "[${time1}] [QUESTION]:  Do you want to install ubuntu-in-ubtouch? [Y/n] "

read cmd1
if [ "$cmd1" = "y" ];then
    install_ubuntu
elif [ "$cmd1" = "Y" ];then
    install_ubuntu
else
    echo "[${time1}] [ERROR]:  Installation aborted."
    echo ""
    exit
fi
else
    echo "[${time1}] [ERROR]:  Installation aborted."
    echo ""
fi