ISO-repository/quick-installer.sh

#!/bin/sh

install_sudo() {
    echo ">>> Detecting package manager..." >&2
    # Check if apt is installed for Debian based distributions
    dpkg-query -l apt > /dev/null 2>&1
    if [ $? = 0 ]; then
        echo ">>> Apt found, updating repository database..." >&2
        apt update -qq

        echo ">>> Installing sudo package..." >&2
        apt install sudo -qq
        echo 0
    fi
    
    echo ">>> No supported package manager detected, exciting..." >&2
    echo 1
}

check_privilege() {
    if ! [ $(id -u) = 0 ]; then
        echo ">>> Please run as root" >&2
        echo 1
    fi
}

check_sudo_installation() {
    dpkg-query -l sudo > /dev/null 2>&1

    if ! [ $? = 0 ]; then
        echo ">>> Sudo package missing..." >&2
        echo $(install_sudo)
    fi

    echo 0
}

create_default_user() {
    echo ">>> Adding creator user..." >&2
    useradd -m -G sudo creator
    
    echo ">>> Updating creator password..." >&2
    sed -i 's/creator:\*:/creator:\$6\$saltsalt\$EamwjkVXAe1WqiTTXuzgsmljl5cpVewMLH3xl8TdvQ\/V4S9e30upeNz2bdLkG5\.H71TCEso5Nl0jpyZRx7xy6\/:/g' /etc/shadow
}

set_creator_ssh_keys() {
    echo ">>> Setting creator ssh keys..." >&2
    sudo -u creator mkdir -p -m 700 /home/creator/.ssh
    sudo -u creator sh -c 'echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDYsz4jdyzf9UcJ8eEavVmi+DNYE3ioeJBfTlVMw7Vsb tanguy@Diogenes" > /home/creator/.ssh/authorized_keys'
    chmod 600 /home/creator/.ssh/authorized_keys
}

if ! check_privilege; then
    echo ">>> Error: Please run as root" >&2
    exit 1
fi

check_sudo_installation

create_default_user

set_creator_ssh_keys