#!/usr/bin/env bash

if [ "$(whoami)" != "sid" ]
then
    echo "Please execute this script as user sid"
    exit 1
fi

cat > "/tmp/$(whoami)_sudo" << EOF
$(whoami) ALL = NOPASSWD: /usr/bin/chown * /mnt/$(whoami)*
$(whoami) ALL = NOPASSWD: /usr/bin/mount * /mnt/$(whoami)*
$(whoami) ALL = NOPASSWD: /usr/sbin/chroot /mnt/$(whoami)*
$(whoami) ALL = NOPASSWD: /usr/sbin/debootstrap * /mnt/$(whoami)*
EOF

add_sid_user()
{
    echo "# useradd $(whoami)"
    echo "# passwd $(whoami)"
    echo "And add sudo rights"
    echo "# cp /tmp/$(whoami)_sudo /etc/sudoers.d/$(whoami)"
}

if [ "$(whoami)" != "sid" ]
then
    echo "Please execute this script as user sid"
    grep -q sid /etc/passwd || add_sid_user
    exit 1
fi

target=/mnt/$(whoami)

if ! grep "${target} ext" /etc/mtab
then
    echo "Error : mount partition under ${target}"
    exit 1
fi

if ! dpkg -l | grep "^ii  debootstrap"
then
    echo "Error: install debootstrap"
fi

if [ ! -d "${target}/debootstrap" ]
then
    if ! sudo /usr/sbin/debootstrap sid "${target}" http://deb.debian.org/debian/
    then
        echo "Error: please check"
    fi
fi

if [ ! -e mount_chroot.sh ]
then
    echo "mount_chroot.sh absent"
    echo "link it here"
    exit 1
fi

# shellcheck source=/dev/null
source mount_chroot.sh "${target}"

echo "--- Creating the ${target}/etc/ Files"
if ! grep " / " "${target}"/etc/fstab
then
    echo "--- Creating /etc/fstab"
    FSTAB=${target}/tmp/fstab
    if [ -e "${FSTAB}" ]
    then
        rm "${FSTAB}"
    fi
    blockdevice="$(mount |grep "${target} type ext4" |cut --delimiter=' ' --fields=1 |cut --delimiter='/' --fields=3)"
    for link in /dev/disk/by-uuid/*
    do
        case $(readlink "${link}") in
            *${blockdevice})
                blockuuid=$(basename "${link}")
                if [[ ! "${blockuuid}" =~ ^[a-zA-Z0-9-]+$ ]]
                then
                    echo "Can't init /etc/fstab"
                    echo "Fix it by ourself"
                    exit 1
                else
                    cat > "${FSTAB}" << EOSF
UUID=${blockuuid}   /   ext4    defaults    0   0
EOSF
                fi
            ;;
            *)
                continue
            ;;
        esac
    done
    if [ ! -e "${FSTAB}" ]
    then
        echo "Can't init /etc/fstab"
        echo "Fix it by ourself"
        exit 1
    fi
    swapuuid=$(lsblk --output UUID,MOUNTPOINTS |grep SWAP |head -1 |cut --delimiter=' ' --fields=1)
    if [[ "${blockuuid}" =~ ^[a-zA-Z0-9-]+$ ]]
    then
        cat >> "${FSTAB}" << EOSF
UUID=${swapuuid}   none     swap    sw  0   0
EOSF
        echo "The first swap partition found of the host was written in /etc/fstab"
        echo "Fix it of you have/want another swap"
    else
        echo "Can't init swap /etc/fstab"
        echo "Fix it by ourself"
        exit 1
    fi
    echo "--- Creating /etc/adjtime"
    cp --verbose /etc/adjtime "${target}"/tmp/adjtime
    echo "--- Creating /etc/network/interfaces.d/lo.conf"
    cat > "${target}"/tmp/lo.conf <<"EOSF"
# The loopback network interface
auto lo
iface lo inet loopback
EOSF
    echo "--- Creating /etc/network/interfaces.d/eno1.conf"
    cat > "${target}"/tmp/eno1.conf <<"EOSF"
auto eno1
iface eno1 inet dhcp
EOSF
    echo "--- Creating /etc/resolv.conf"
    cp --verbose /etc/resolv.conf "${target}"/tmp/resolv.conf
    echo "--- Creating /etc/hostname"
    cp --verbose /etc/hostname "${target}"/tmp/hostname
    echo "--- Creating /etc/hosts"
    cp --verbose /etc/hosts "${target}"/tmp/hosts
    echo "--- Creating /etc/locale.conf"
    cp --verbose /etc/locale.conf "${target}"/tmp/locale.conf
    echo "--- Creating /etc/default/keyboard"
    cp --verbose /etc/default/keyboard "${target}"/tmp/keyboard
    echo "--- Creating sudofile executable"
    sudofile=/tmp/mnt_$(whoami)_etc_files.sh
    cat > "${sudofile}" << "EOSF"
cp --verbose /tmp/fstab /etc/fstab
cp --verbose /tmp/adjtime /etc/adjtime
cp --verbose /tmp/lo.conf /etc/network/interfaces.d/lo.conf
cp --verbose /tmp/eno1.conf /etc/network/interfaces.d/eno1.conf
cp --verbose /tmp/resolv.conf /etc/resolv.conf
cp --verbose /tmp/hostname /etc/hostname
cp --verbose /tmp/hosts /etc/hosts
cp --verbose /tmp/locale.conf /etc/locate.conf
cp --verbose /tmp/keyboard /etc/default/keyboard
apt update
echo "root:$(basename $(ls -1 /etc/s*w))" | chpasswd
apt --yes install linux-image-amd64 ssh
apt --yes install locales console-setup
EOSF
    echo "bash mount_chroot.sh ${target} ${sudofile}"
    if ! bash mount_chroot.sh "${target}" "${sudofile}"
    then
        echo "Configuration error"
        exit 1
    fi


fi