termux-chroot-arm64.sh

#!/data/data/com.termux/files/usr/bin/bash
set -e
if [ "$EUID" -ne 0 ]; then
    echo "This script must be run as root."
    exit 1
fi
echo -e 'Do you want to: \n1. Setup a New chroot environment. \n2. Login to an already existing rootfs. \n3. Delete a Rootfs. \nAny other Character to Exit.'
read -p 'Enter Your Choice (1/2/3): ' choice
choice="${choice,,}"
if [[ "$choice" == 1 ]]; then
    read -p "Enter the Location of the rootfs tar archive: " file
    if [ ! -f "$file" ]; then
        echo -e "ERROR: Required File does not exist at $file."
        exit 1
    fi
    echo -e "Please Wait till we check the rootfs tar archive for Corruption."
    if tar -t -f "$file"  &>/dev/null; then
        read -p "Enter a non-existing Directory Location to Extract the rootfs: " dir
        if [ ! -d "$dir" ]; then
            mkdir -p "$dir"
            echo -e "Directory Created at $dir"
        else
            echo -e "Directory already exists at $dir"
            exit 1
        fi
        echo "Extracting rootfs..."
        tar -xpf "$file" -C "$dir"
    else
        echo "Error: The file is not a valid tar archive or is corrupted. Exiting Script."
        exit 1
    fi
    essential_dirs=("bin" "etc" "lib" "dev" "proc" "sys" "sbin")
        if [ ! -d "$dir" ]; then
                echo -e "Error:Rootfs Directory $dir does NOT exists."
                exit 1
        else
                for rootfs_dirs in  "{$essential_dirs[@]}"; do
                        if [ ! -d "$dir/$essential_dirs" ]; then
                                echo -e "Directory $dir/$essential_dirs does NOT exists ! \nThe provided TAR File may not be a rootfs !"
                                exit 1
            fi
                done
    fi
    mount -t proc proc "$dir/proc"
    mount -t sysfs sys "$dir/sys"
    mount --bind /dev "$dir/dev"
    mount -t devpts devpts "$dir/dev/pts"
    env -i LD_PRELOAD='' TERM=xterm chroot "$dir" /usr/bin/bash --login -c "export PATH=/usr/bin:/bin:/usr/sbin:/sbin; echo -e '!!! EXITING WILL KILL ALL THE PROCESSES INSIDE THIS CHROOT !!! \nTo get internet access you may want to execute: \necho nameserver 8.8.8.8 >> /etc/resolv.conf'; /bin/bash"
    umount "$dir/dev/pts"
    umount "$dir/dev"
    umount "$dir/sys"
    umount "$dir/proc"
elif [[ "$choice" == 2 ]]; then
    essential_dirs=("bin" "etc" "lib" "dev" "proc" "sys" "sbin")
    read -p "Enter the rootfs Directory Location: " dir
    if [ ! -d "$dir" ]; then
        echo -e "Error:Rootfs Directory $dir does NOT exists."
        exit 1
        else
        for rootfs_dirs in  "{$essential_dirs[@]}"; do
            if [ ! -d "$dir/$essential_dirs" ]; then
                echo -e "Directory $dir/$essential_dirs does NOT exists ! \nThe provided Directory may NOT be a rootfs !"
                exit 1
            fi
        done
                mount -t proc proc "$dir/proc"
        mount -t sysfs sys "$dir/sys"
        mount --bind /dev "$dir/dev"
        mount -t devpts devpts "$dir/dev/pts"
        env -i LD_PRELOAD='' TERM=xterm chroot "$dir" /usr/bin/bash --login -c "export PATH=/usr/bin:/bin:/usr/sbin:/sbin; echo -e '!!! EXITING WILL KILL ALL THE PROCESSES INSIDE THIS CHROOT !!! \nTo get internet access you may want to execute: \necho nameserver 8.8.8.8 >> /etc/resolv.conf'; /bin/bash"
        umount "$dir/dev/pts"
        umount "$dir/dev"
        umount "$dir/sys"
        umount "$dir/proc"
        fi
elif [[ "$choice" == 3 ]]; then
    essential_dirs=("bin" "etc" "lib" "dev" "proc" "sys" "sbin")
        read -p "Enter the rootfs Directory Location: " dir
        if [ ! -d "$dir" ]; then
                echo -e "Error:Rootfs Directory $dir does NOT exists."
        else
                for rootfs_dirs in  "{$essential_dirs[@]}"; do
                        if [ ! -d "$dir/$essential_dirs" ]; then
                                echo -e "Directory $dir/$essential_dirs does NOT exists ! \nThe provided Directory may NOT be a rootfs !"
                                exit 1
                        fi
                done
        read -p "Do you want to delete the rootfs at $dir ? (y/N): " confirm_delete
            confirm_delete="${confirm_delete,,}"
            if [[ "$confirm_delete" == "y" || "$confirm_delete" == "yes" ]]; then
                    rm -r "$dir"
                    echo -e "Rootfs at $dir has been Deleted."
            else
                    echo -e "Rootfs at $dir has NOT been Deleted."
            fi
    fi
else
    echo "Exiting Script..."
    exit 0
fi