function hetzner-rescue-configure {
local host="${1}"
    local package
    local packages=(
    'mosh'
    'screen' 'tmux' 'byobu'
    'apt-file'
    )
    # apt / conf
    echo -n "\
Acquire::AllowInsecureRepositories False;
Acquire::AllowWeakRepositories False;
Acquire::AllowDowngradeToInsecureRepositories False;
Acquire::Check-Valid-Until True;
APT::Install-Recommends False;
APT::Install-Suggests False;
APT::Get::Show-Versions True;
Dir::Etc::SourceParts '';
Dpkg::Progress True;
" > '/etc/apt/apt.conf'
    # apt / sources
    echo -n "\
deb https://deb.debian.org/debian bookworm main non-free-firmware contrib non-free
deb https://deb.debian.org/debian bookworm-backports main non-free-firmware contrib non-free
deb https://deb.debian.org/debian bookworm-updates main non-free-firmware contrib non-free
deb https://deb.debian.org/debian-security bookworm-security main non-free-firmware contrib non-free
" > '/etc/apt/sources.list'
    # bash / rc
    main_link_bashrc
    # host name
    hostname "${host}"
    # locales
    echo -n "\
en_US.UTF-8 UTF-8
fr_FR.UTF-8 UTF-8
" > '/etc/locale.gen'
    # generate locales
    locale-gen
    # update catalog
    apt-get update
    #
    debian_disable_frontend
    # install packages
    for package in "${packages[@]}" ; do
        echo ; echo "${package}"
        apt-get install \
        --assume-yes \
        "${package}"
        apt_clean_cache
    done
    # update catalog
    apt-get update
}

function hetzner-rescue-install {
    local package
    local release='bookworm'
    local packages=(
    # installed
    'dmidecode' 'efibootmgr' 'pciutils' 'usbutils'
    'parted' 'mdadm' 'cryptsetup-bin' 'lvm2'
    'btrfs-progs' 'dosfstools'
    'git' 'nano' 'python3' 'rsync' 'vim'
    'file' 'htop' 'lsof' 'man-db' 'tree' 'uuid-runtime'
    # install
    'lshw'
    'squashfs-tools'
    'grub-efi-amd64-bin' 'grub-pc-bin'
    'libdigest-sha3-perl' 'micro'
    'iotop'
    'exa' 'ipcalc' 'lf' 'ncdu' 'nnn' 'ranger'
    )
    local backports=(
    )
    # update catalog
    apt-get update
    #
    debian_disable_frontend
    # upgrade packages
    apt-get upgrade --assume-yes
    #
    apt_clean_cache
    # install packages
    for package in "${packages[@]}" ; do
        echo ; echo "${package}"
        apt-get install \
        --assume-yes \
        "${package}"
        apt_clean_cache
    done
    # install backports
    for package in "${backports[@]}" ; do
        echo ; echo "${package}"
        apt-get install \
        --assume-yes \
        --target-release "${release}-backports" \
        "${package}"
        apt_clean_cache
    done
}

function hetzner-rescue-upload {
local host="${1}"
if [ "${host}" ] ; then
    local user='root'
    #
    local user_host="${user}@${host}"
    # remove fingerprints
    ssh-keygen -R "${host}"
    # copy ssh id
    ssh-copy-id \
    -o 'StrictHostKeyChecking=accept-new' \
    "${user_host}"
    # upload root
    rsync --delete --recursive "${MAIN_BASH_ROOT}/" "${user_host}:/etc/bash/"
    # call setup
    # TODO variable
    ssh "${user_host}" -- "source '/etc/bash/main.sh' ; hetzner-rescue-configure '${host}'"
    # create session
    ssh "${user_host}" -- byobu new-session -d
    # send keys
    ssh "${user_host}" -- byobu send-keys 'hetzner-rescue-install' 'C-m'
    # attach session
    mosh "${user_host}" -- byobu attach-session
else
    echo 'Host?'
    return 1
fi
}