ISO/archiso/mkarchiso

#!/bin/bash
#
# SPDX-License-Identifier: GPL-3.0-or-later

set -e -u

# Control the environment
umask 0022
export LANG="C"
export SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:-"$(date +%s)"}"

# mkarchiso defaults
app_name="${0##*/}"
pkg_list=()
run_cmd=""
quiet="y"
work_dir="work"
out_dir="out"
img_name="${app_name}.iso"
sfs_mode="sfs"
sfs_comp="xz"
gpg_key=""

# profile defaults
profile=""
iso_name="${app_name}"
iso_label="${app_name^^}"
iso_publisher="${app_name}"
iso_application="${app_name} iso"
iso_version=""
install_dir="${app_name}"
arch="$(uname -m)"
pacman_conf="/etc/pacman.conf"
bootmodes=()


# Show an INFO message
# $1: message string
_msg_info() {
    local _msg="${1}"
    [[ "${quiet}" == "y" ]] || printf '[%s] INFO: %s\n' "${app_name}" "${_msg}"

}

# Show a WARNING message
# $1: message string
_msg_warning() {
    local _msg="${1}"
    printf '\n[%s] WARNING: %s\n\n' "${app_name}" "${_msg}" >&2
}

# Show an ERROR message then exit with status
# $1: message string
# $2: exit code number (with 0 does not exit)
_msg_error() {
    local _msg="${1}"
    local _error=${2}
    printf '\n[%s] ERROR: %s\n\n' "${app_name}" "${_msg}" >&2
    if (( _error > 0 )); then
        exit "${_error}"
    fi
}

_chroot_init() {
    mkdir -p -- "${airootfs_dir}"
    _pacman base syslinux
}

_chroot_run() {
    eval -- arch-chroot "${airootfs_dir}" "${run_cmd}"
}

_mount_airootfs() {
    trap "_umount_airootfs" EXIT HUP INT TERM
    mkdir -p -- "${work_dir}/mnt/airootfs"
    _msg_info "Mounting '${airootfs_dir}.img' on '${work_dir}/mnt/airootfs'"
    mount -- "${airootfs_dir}.img" "${work_dir}/mnt/airootfs"
    _msg_info "Done!"
}

_umount_airootfs() {
    _msg_info "Unmounting '${work_dir}/mnt/airootfs'"
    umount -d -- "${work_dir}/mnt/airootfs"
    _msg_info "Done!"
    rmdir -- "${work_dir}/mnt/airootfs"
    trap - EXIT HUP INT TERM
}

# Show help usage, with an exit status.
# $1: exit status number.
_usage () {
    IFS='' read -r -d '' usagetext <<ENDUSAGETEXT || true
usage ${app_name} [options] command <command options>
 general options:
    -B <profile_dir> Directory of the archiso profile to build
    -p PACKAGE(S)    Package(s) to install, can be used multiple times
    -C <file>        Config file for pacman.
                     Default: '${pacman_conf}'
    -L <label>       Set a label for the disk
                     Default: '${iso_label}'
    -P <publisher>   Set a publisher for the disk
                     Default: '${iso_publisher}'
    -A <application> Set an application name for the disk
                     Default: '${iso_application}'
    -D <install_dir> Set an install_dir. All files will by located here.
                     Default: '${install_dir}'
                     NOTE: Max 8 characters, use only [a-z0-9]
    -w <work_dir>    Set the working directory
                     Default: '${work_dir}'
    -o <out_dir>     Set the output directory
                     Default: '${out_dir}'
    -s <sfs_mode>    Set SquashFS image mode (img or sfs)
                     img: prepare airootfs.sfs for dm-snapshot usage
                     sfs: prepare airootfs.sfs for overlayfs usage
                     Default: '${sfs_mode}'
    -c <comp_type>   Set SquashFS compression type (gzip, lzma, lzo, xz, zstd)
                     Default: '${sfs_comp}'
    -v               Enable verbose output
    -h               This message
 commands:
   build_profile
      build an iso image from a profile
ENDUSAGETEXT
    printf '%s\n' "${usagetext}"
    exit "${1}"
}

# Shows configuration according to command mode.
# $1: init | install | run | prepare | iso
_show_config () {
    local _mode="$1"
    printf '\n'
    _msg_info "Configuration settings"
    _msg_info "                  Command:   ${command_name}"
    _msg_info "             Architecture:   ${arch}"
    _msg_info "        Working directory:   ${work_dir}"
    _msg_info "   Installation directory:   ${install_dir}"
    case "${_mode}" in
        init)
            _msg_info "       Pacman config file:   ${pacman_conf}"
            ;;
        install)
            _msg_info "       Pacman config file:   ${pacman_conf}"
            _msg_info "                 Packages:   ${pkg_list[*]}"
            ;;
        run)
            _msg_info "              Run command:   ${run_cmd}"
            ;;
        prepare)
            ;;
        pkglist)
            ;;
        iso)
            _msg_info "               Image name:   ${img_name}"
            _msg_info "               Disk label:   ${iso_label}"
            _msg_info "           Disk publisher:   ${iso_publisher}"
            _msg_info "         Disk application:   ${iso_application}"
            ;;
    esac
    printf '\n'
}

# Install desired packages to airootfs
_pacman () {
    _msg_info "Installing packages to '${airootfs_dir}/'..."

    if [[ "${quiet}" = "y" ]]; then
        pacstrap -C "${pacman_conf}" -c -G -M -- "${airootfs_dir}" "$@" &> /dev/null
    else
        pacstrap -C "${pacman_conf}" -c -G -M -- "${airootfs_dir}" "$@"
    fi

    _msg_info "Packages installed successfully!"
}

# Cleanup airootfs
_cleanup () {
    _msg_info "Cleaning up what we can on airootfs..."

    # Delete all files in /boot
    if [[ -d "${airootfs_dir}/boot" ]]; then
        find "${airootfs_dir}/boot" -mindepth 1 -delete
    fi
    # Delete pacman database sync cache files (*.tar.gz)
    if [[ -d "${airootfs_dir}/var/lib/pacman" ]]; then
        find "${airootfs_dir}/var/lib/pacman" -maxdepth 1 -type f -delete
    fi
    # Delete pacman database sync cache
    if [[ -d "${airootfs_dir}/var/lib/pacman/sync" ]]; then
        find "${airootfs_dir}/var/lib/pacman/sync" -delete
    fi
    # Delete pacman package cache
    if [[ -d "${airootfs_dir}/var/cache/pacman/pkg" ]]; then
        find "${airootfs_dir}/var/cache/pacman/pkg" -type f -delete
    fi
    # Delete all log files, keeps empty dirs.
    if [[ -d "${airootfs_dir}/var/log" ]]; then
        find "${airootfs_dir}/var/log" -type f -delete
    fi
    # Delete all temporary files and dirs
    if [[ -d "${airootfs_dir}/var/tmp" ]]; then
        find "${airootfs_dir}/var/tmp" -mindepth 1 -delete
    fi
    # Delete package pacman related files.
    find "${work_dir}" \( -name '*.pacnew' -o -name '*.pacsave' -o -name '*.pacorig' \) -delete
    _msg_info "Done!"
    # Create an empty /etc/machine-id
    printf '' > "${work_dir}/airootfs/etc/machine-id"
}

# Makes a ext4 filesystem inside a SquashFS from a source directory.
_mkairootfs_img () {
    if [[ ! -e "${airootfs_dir}" ]]; then
        _msg_error "The path '${airootfs_dir}' does not exist" 1
    fi

    _msg_info "Creating ext4 image of 32GiB..."
    truncate -s 32G -- "${airootfs_dir}.img"
    if [[ "${quiet}" == "y" ]]; then
        mkfs.ext4 -q -O '^has_journal,^resize_inode' -E 'lazy_itable_init=0' -m 0 -F -- "${airootfs_dir}.img"
    else
        mkfs.ext4 -O '^has_journal,^resize_inode' -E 'lazy_itable_init=0' -m 0 -F -- "${airootfs_dir}.img"
    fi
    tune2fs -c 0 -i 0 -- "${airootfs_dir}.img" &> /dev/null
    _msg_info "Done!"
    _mount_airootfs
    _msg_info "Copying '${airootfs_dir}/' to '${work_dir}/mnt/airootfs/'..."
    cp -aT -- "${airootfs_dir}/" "${work_dir}/mnt/airootfs/"
    chown root:root -- "${work_dir}/mnt/airootfs/"
    _msg_info "Done!"
    _umount_airootfs
    mkdir -p -- "${isofs_dir}/${install_dir}/${arch}"
    _msg_info "Creating SquashFS image, this may take some time..."
    if [[ "${quiet}" = "y" ]]; then
        mksquashfs "${airootfs_dir}.img" "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs" -noappend \
            -comp "${sfs_comp}" -no-progress &> /dev/null
    else
        mksquashfs "${airootfs_dir}.img" "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs" -noappend \
            -comp "${sfs_comp}"
    fi
    _msg_info "Done!"
    rm -- "${airootfs_dir}.img"
}

# Makes a SquashFS filesystem from a source directory.
_mkairootfs_sfs () {
    if [[ ! -e "${airootfs_dir}" ]]; then
        _msg_error "The path '${airootfs_dir}' does not exist" 1
    fi

    mkdir -p -- "${isofs_dir}/${install_dir}/${arch}"
    _msg_info "Creating SquashFS image, this may take some time..."
    if [[ "${quiet}" = "y" ]]; then
        mksquashfs "${airootfs_dir}" "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs" -noappend \
            -comp "${sfs_comp}" -no-progress &> /dev/null
    else
        mksquashfs "${airootfs_dir}" "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs" -noappend \
            -comp "${sfs_comp}"
    fi
    _msg_info "Done!"
}

_mkchecksum () {
    _msg_info "Creating checksum file for self-test..."
    cd -- "${isofs_dir}/${install_dir}/${arch}"
    sha512sum airootfs.sfs > airootfs.sha512
    cd -- "${OLDPWD}"
    _msg_info "Done!"
}

_mksignature () {
    _msg_info "Creating signature file..."
    cd -- "${isofs_dir}/${install_dir}/${arch}"
    gpg --detach-sign --default-key "${gpg_key}" airootfs.sfs
    cd -- "${OLDPWD}"
    _msg_info "Done!"
}

# Helper function to run functions only one time.
_run_once() {
    if [[ ! -e "${work_dir}/build.${1}" ]]; then
        "$1"
        touch "${work_dir}/build.${1}"
    fi
}

# Set up custom pacman.conf with current cache directories.
_make_pacman_conf() {
    local _cache_dirs
    _cache_dirs="$(pacman-conf CacheDir)"
    sed -r "s|^#?\\s*CacheDir.+|CacheDir    = ${_cache_dirs[*]//$'\n'/ }|g" \
        "${pacman_conf}" > "${work_dir}/pacman.conf"
}

# Prepare working directory and copy custom airootfs files (airootfs)
_make_custom_airootfs() {
    mkdir -m 755 -- "${airootfs_dir}"

    local passwd=()
    if [[ -d "${profile}/airootfs" ]]; then
        cp -af --no-preserve=ownership -- "${profile}/airootfs/." "${airootfs_dir}"

        [[ -e "${airootfs_dir}/etc/shadow" ]] && chmod -f 0400 -- "${airootfs_dir}/etc/shadow"
        [[ -e "${airootfs_dir}/etc/gshadow" ]] && chmod -f 0400 -- "${airootfs_dir}/etc/gshadow"

        # Set up user home directories and permissions
        if [[ -e "${airootfs_dir}/etc/passwd" ]]; then
            while IFS=':' read -a passwd -r; do
                [[ "${passwd[5]}" == '/' ]] && continue
                [[ -z "${passwd[5]}" ]] && continue

                if [[ -d "${airootfs_dir}${passwd[5]}" ]]; then
                    chown -hR -- "${passwd[2]}:${passwd[3]}" "${airootfs_dir}${passwd[5]}"
                    chmod -f 0750 -- "${airootfs_dir}${passwd[5]}"
                else
                    install -d -m 0750 -o "${passwd[2]}" -g "${passwd[3]}" -- "${airootfs_dir}${passwd[5]}"
                fi
             done < "${airootfs_dir}/etc/passwd"
        fi
    fi
}

# Packages (airootfs)
_make_packages() {
    if [[ -n "${gpg_key}" ]]; then
        exec {ARCHISO_GNUPG_FD}<>"${work_dir}/pubkey.gpg"
        export ARCHISO_GNUPG_FD
    fi
    _pacman "${pkg_list[@]}"
    if [[ -n "${gpg_key}" ]]; then
        exec {ARCHISO_GNUPG_FD}<&-
        unset ARCHISO_GNUPG_FD
    fi
}

# Customize installation (airootfs)
_make_customize_airootfs() {
    local passwd=()
    if [[ -e "${profile}/airootfs/etc/passwd" ]]; then
        while IFS=':' read -a passwd -r; do
            if [[ "${passwd[5]}" == '/' ]]; then
                continue
            fi
            cp -RdT --preserve=mode,timestamps,links -- "${airootfs_dir}/etc/skel" "${airootfs_dir}${passwd[5]}"
            chown -hR -- "${passwd[2]}:${passwd[3]}" "${airootfs_dir}${passwd[5]}"

        done < "${profile}/airootfs/etc/passwd"
    fi

    if [[ -e "${airootfs_dir}/root/customize_airootfs.sh" ]]; then
        _msg_warning "customize_airootfs.sh is deprecated! Support for it will be removed in a future archiso version."
        local run_cmd="/root/customize_airootfs.sh"
        local work_dir="${work_dir}/${arch}"
        command_run
        rm -- "${airootfs_dir}/root/customize_airootfs.sh"
    fi
}

# Set up boot loaders
_make_bootmodes() {
    local bootmode
    for bootmode in "${bootmodes[@]}"; do
        if typeset -f "_make_boot_${bootmode}" &> /dev/null; then
            _run_once "_make_boot_${bootmode}"
        else
            _msg_error "${bootmode} is not a valid boot mode" 1
        fi
    done
}

# Prepare kernel/initramfs ${install_dir}/boot/
_make_boot_on_iso() {
    mkdir -p -- "${isofs_dir}/${install_dir}/boot/${arch}"
    install -m 0644 -- "${airootfs_dir}/boot/archiso.img" "${isofs_dir}/${install_dir}/boot/${arch}/"
    install -m 0644 -- "${airootfs_dir}/boot/vmlinuz-linux" "${isofs_dir}/${install_dir}/boot/${arch}/"
    if [[ -e "${airootfs_dir}/boot/intel-ucode.img" ]]; then
        install -m 0644 -- "${airootfs_dir}/boot/intel-ucode.img" "${isofs_dir}/${install_dir}/boot/"
        mkdir -p "${isofs_dir}/${install_dir}/boot/licenses/intel-ucode/"
        install -m 0644 -- "${airootfs_dir}/usr/share/licenses/intel-ucode/"* \
            "${isofs_dir}/${install_dir}/boot/licenses/intel-ucode/"
    fi
    if [[ -e "${airootfs_dir}/boot/amd-ucode.img" ]]; then
        install -m 0644 -- "${airootfs_dir}/boot/amd-ucode.img" "${isofs_dir}/${install_dir}/boot/"
        mkdir -p "${isofs_dir}/${install_dir}/boot/licenses/amd-ucode/"
        install -m 0644 -- "${airootfs_dir}/usr/share/licenses/amd-ucode/"* \
            "${isofs_dir}/${install_dir}/boot/licenses/amd-ucode/"
    fi
}

# Prepare /${install_dir}/boot/syslinux
_make_boot_bios.syslinux.mbr() {
    mkdir -p "${isofs_dir}/${install_dir}/boot/syslinux"
    for _cfg in "${profile}/syslinux/"*.cfg; do
        sed "s|%ARCHISO_LABEL%|${iso_label}|g;
             s|%INSTALL_DIR%|${install_dir}|g;
             s|%ARCH%|${arch}|g" \
             "${_cfg}" > "${isofs_dir}/${install_dir}/boot/syslinux/${_cfg##*/}"
    done
    if [[ -e "${profile}/syslinux/splash.png" ]]; then
        install -m 0644 -- "${profile}/syslinux/splash.png" "${isofs_dir}/${install_dir}/boot/syslinux/"
    fi
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/"*.c32 "${isofs_dir}/${install_dir}/boot/syslinux/"
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/lpxelinux.0" "${isofs_dir}/${install_dir}/boot/syslinux/"
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/memdisk" "${isofs_dir}/${install_dir}/boot/syslinux/"

    _make_boot_on_iso
    _uname_r=$(file -b "${isofs_dir}/${install_dir}/boot/${arch}/vmlinuz-linux" | awk 'f{print;f=0} /version/{f=1}' RS=' ')

    mkdir -p "${isofs_dir}/${install_dir}/boot/syslinux/hdt"
    gzip -c -9 "${airootfs_dir}/usr/share/hwdata/pci.ids" > \
        "${isofs_dir}/${install_dir}/boot/syslinux/hdt/pciids.gz"
    gzip -c -9 "${airootfs_dir}/usr/lib/modules/${_uname_r}/modules.alias" > \
        "${isofs_dir}/${install_dir}/boot/syslinux/hdt/modalias.gz"

    # Add other aditional/extra files to ${install_dir}/boot/
    if [[ -e "${airootfs_dir}/boot/memtest86+/memtest.bin" ]]; then
        # rename for PXE: https://wiki.archlinux.org/index.php/Syslinux#Using_memtest
        install -m 0644 -- "${airootfs_dir}/boot/memtest86+/memtest.bin" "${isofs_dir}/${install_dir}/boot/memtest"
        mkdir -p "${isofs_dir}/${install_dir}/boot/licenses/memtest86+/"
        install -m 0644 -- "${airootfs_dir}/usr/share/licenses/common/GPL2/license.txt" \
            "${isofs_dir}/${install_dir}/boot/licenses/memtest86+/"
    fi
}

# Prepare /isolinux
_make_boot_bios.syslinux.eltorito() {
    mkdir -p "${isofs_dir}/isolinux"
    sed "s|%ARCHISO_LABEL%|${iso_label}|g;
         s|%INSTALL_DIR%|${install_dir}|g;
         s|%ARCH%|${arch}|g" \
         "${profile}/isolinux/isolinux.cfg" > "${isofs_dir}/isolinux/isolinux.cfg"
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/isolinux.bin" "${isofs_dir}/isolinux/"
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/isohdpfx.bin" "${isofs_dir}/isolinux/"
    install -m 0644 -- "${airootfs_dir}/usr/lib/syslinux/bios/ldlinux.c32" "${isofs_dir}/isolinux/"

    # isolinux.cfg loads syslinux.cfg
    _run_once _make_boot_bios.syslinux.mbr
}

# Prepare /EFI on ISO-9660
_make_efi() {
    mkdir -p "${isofs_dir}/EFI/BOOT"
    install -m 0644 -- "${airootfs_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi" \
        "${isofs_dir}/EFI/BOOT/BOOTx64.EFI"

    mkdir -p "${isofs_dir}/loader/entries"
    install -m 0644 -- "${profile}/efiboot/loader/loader.conf" "${isofs_dir}/loader/"

    sed "s|%ARCHISO_LABEL%|${iso_label}|g;
         s|%INSTALL_DIR%|${install_dir}|g;
         s|%ARCH%|${arch}|g" \
        "${profile}/efiboot/loader/entries/archiso-x86_64-usb.conf" > \
        "${isofs_dir}/loader/entries/archiso-x86_64.conf"

    # edk2-shell based UEFI shell
    # shellx64.efi is picked up automatically when on /
    if [[ -e "${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" ]]; then
        install -m 0644 -- "${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" "${isofs_dir}/shellx64.efi"
    fi
}

# Prepare kernel/initramfs on efiboot.img
_make_boot_on_fat() {
    mkdir -p "${work_dir}/efiboot/EFI/archiso"
    install -m 0644 -- "${airootfs_dir}/boot/vmlinuz-linux" "${work_dir}/efiboot/EFI/archiso/"
    install -m 0644 -- "${isofs_dir}/${install_dir}/boot/${arch}/archiso.img" "${work_dir}/efiboot/EFI/archiso/"
    if [[ -e "${airootfs_dir}/boot/intel-ucode.img" ]]; then
        install -m 0644 -- "${airootfs_dir}/boot/intel-ucode.img" "${work_dir}/efiboot/EFI/archiso/"
    fi
    if [[ -e "${airootfs_dir}/boot/amd-ucode.img" ]]; then
        install -m 0644 -- "${airootfs_dir}/boot/amd-ucode.img" "${work_dir}/efiboot/EFI/archiso/"
    fi
}

# Prepare efiboot.img::/EFI for EFI boot mode
_make_boot_uefi-x64.systemd-boot.esp() {
    mkdir -p "${isofs_dir}/EFI/archiso"
    mkfs.fat -C -n ARCHISO_EFI "${isofs_dir}/EFI/archiso/efiboot.img" 65536

    mkdir -p "${work_dir}/efiboot"
    mount "${isofs_dir}/EFI/archiso/efiboot.img" "${work_dir}/efiboot"

    mkdir -p "${work_dir}/efiboot/EFI/BOOT"
    install -m 0644 -- "${airootfs_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi" \
        "${work_dir}/efiboot/EFI/BOOT/BOOTx64.EFI"

    mkdir -p "${work_dir}/efiboot/loader/entries"
    install -m 0644 -- "${profile}/efiboot/loader/loader.conf" "${work_dir}/efiboot/loader/"

    sed "s|%ARCHISO_LABEL%|${iso_label}|g;
         s|%INSTALL_DIR%|${install_dir}|g;
         s|%ARCH%|${arch}|g" \
        "${profile}/efiboot/loader/entries/archiso-x86_64-cd.conf" > \
        "${work_dir}/efiboot/loader/entries/archiso-x86_64.conf"

    # shellx64.efi is picked up automatically when on /
    if [[ -e "${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" ]]; then
        install -m 0644 -- "${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" "${work_dir}/efiboot/shellx64.efi"
    fi

    # Copy kernel and initramfs
    _make_boot_on_fat

    umount -d "${work_dir}/efiboot"
}

# Prepare efiboot.img::/EFI for "El Torito" EFI boot mode
_make_boot_uefi-x64.systemd-boot.eltorito() {
    _run_once _make_boot_uefi-x64.systemd-boot.esp
    # Set up /EFI on ISO-9660
    _run_once _make_efi
}

# Build airootfs filesystem image
_make_prepare() {
    if [[ "${sfs_mode}" == "sfs" ]]; then
        _mkairootfs_sfs
    else
        _mkairootfs_img
    fi
    _mkchecksum
    if [[ "${gpg_key}" ]]; then
      _mksignature
    fi
}

# Build ISO
_make_iso() {
    local xorrisofs_options=()

    if [[ "${quiet}" == "y" ]]; then
        xorrisofs_options+=('-quiet')
    fi
    # shellcheck disable=SC2076
    if [[ " ${bootmodes[*]} " =~ ' bios.syslinux.' ]]; then
        if [[ ! -f "${isofs_dir}/isolinux/isolinux.bin" ]]; then
            _msg_error "The file '${isofs_dir}/isolinux/isolinux.bin' does not exist." 1
        fi
        if [[ ! -f "${isofs_dir}/isolinux/isohdpfx.bin" ]]; then
            _msg_error "The file '${isofs_dir}/isolinux/isohdpfx.bin' does not exist." 1
        fi
        xorrisofs_options+=(
            '-eltorito-boot' 'isolinux/isolinux.bin'
            '-eltorito-catalog' 'isolinux/boot.cat'
            '-no-emul-boot' '-boot-load-size' '4' '-boot-info-table'
            '-isohybrid-mbr' "${isofs_dir}/isolinux/isohdpfx.bin"
        )
    fi
    # shellcheck disable=SC2076
    if [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.' ]]; then
        xorrisofs_options+=(
            '-eltorito-alt-boot'
            '-e' 'EFI/archiso/efiboot.img'
            '-no-emul-boot'
            '-isohybrid-gpt-basdat'
        )
    fi

    _msg_info "Creating ISO image..."
    xorriso -as mkisofs \
            -iso-level 3 \
            -full-iso9660-filenames \
            -rational-rock \
            -volid "${iso_label}" \
            -appid "${iso_application}" \
            -publisher "${iso_publisher}" \
            -preparer "prepared by ${app_name}" \
            "${xorrisofs_options[@]}" \
            -output "${out_dir}/${img_name}" \
            "${isofs_dir}/"
    _msg_info "Done! | $(du -h -- "${out_dir}/${img_name}")"
}

# Read profile's values from profiledef.sh
_read_profile () {
    if [[ -z "${profile}" ]]; then
        _msg_error "No profile specified!" 1
    fi
    if [[ ! -d "${profile}" ]]; then
        _msg_error "Profile '${profile}' does not exist!" 1
    elif [[ ! -e "${profile}/profiledef.sh" ]]; then
        _msg_error "Profile '${profile}' is missing 'profiledef.sh'!" 1
    else
        # Source profile's variables
        # shellcheck source=configs/releng/profiledef.sh
        . "${profile}/profiledef.sh"
        cd -- "${profile}"

        # Resolve paths
        packages="$(realpath -- "${profile}/packages.${arch}")"
        pacman_conf="$(realpath -- "${pacman_conf}")"

        # Enumerate packages
        [[ -e "${packages}" ]] || _msg_error "File '${packages}' does not exist!" 1
        mapfile -t pkg_list < <(sed '/^[[:blank:]]*#.*/d;s/#.*//;/^[[:blank:]]*$/d' "${packages}")
        if (( ${#pkg_list[@]} == 0 )); then
            _msg_error "'${packages}' does not list any packages!" 1
        fi

        cd -- "${OLDPWD}"
    fi
}

_set_up_directories() {
    local directory
    for directory in "${work_dir}" "${out_dir}" "${work_dir}/${arch}" "${isofs_dir}" "${isofs_dir}/${install_dir}"; do
        [[ -d "${directory}" ]] || mkdir -m 0755 -- "${directory}"
    done
}

_print_settings() {
    _msg_info "${app_name} configuration settings"
    _msg_info "    Command:                   ${command_name}"
    _msg_info "    Working directory:         ${work_dir}"
    _msg_info "    Output directory:          ${out_dir}"
    _msg_info "    GPG key:                   ${gpg_key:-None}"
    _msg_info "Profile configuration settings"
    _msg_info "    Profile:                   ${profile}"
    _msg_info "    Architecture:              ${arch}"
    _msg_info "    Image name:                ${img_name}"
    _msg_info "    Disk label:                ${iso_label}"
    _msg_info "    Disk publisher:            ${iso_publisher}"
    _msg_info "    Disk application:          ${iso_application}"
    _msg_info "    Installation directory:    ${install_dir}"
    _msg_info "    Pacman config file:        ${pacman_conf}"
    _msg_info "    Packages:                  ${pkg_list[*]}"
    _msg_info "    Boot modes:                ${bootmodes[*]}"
}

_export_gpg_publickey() {
    if [[ -n "${gpg_key}" ]]; then
        gpg --batch --output "${work_dir}/pubkey.gpg" --export "${gpg_key}"
    fi
}


_make_pkglist() {
    _msg_info "Creating a list of installed packages on live-enviroment..."
    pacman -Q --sysroot "${airootfs_dir}" > "${isofs_dir}/${install_dir}/pkglist.${arch}.txt"
    _msg_info "Done!"
}

command_pkglist () {
    _show_config pkglist
    _make_pkglist
}

# Create an ISO9660 filesystem from "iso" directory.
command_iso () {
    bootmodes=('bios.syslinux.mbr' 'bios.syslinux.eltorito')

    # If exists, add an EFI "El Torito" boot image (FAT filesystem) to ISO-9660 image.
    if [[ -f "${isofs_dir}/EFI/archiso/efiboot.img" ]]; then
        bootmodes+=('uefi-x64.systemd-boot.esp' 'uefi-x64.systemd-boot.eltorito')
    fi

    _show_config iso
    mkdir -p -- "${out_dir}"
    _make_iso
}

# create airootfs.sfs filesystem, and push it in "iso" directory.
command_prepare () {
    _show_config prepare

    _cleanup
    _make_prepare
}

# Install packages on airootfs.
# A basic check to avoid double execution/reinstallation is done via hashing package names.
command_install () {
    if [[ ! -f "${pacman_conf}" ]]; then
        _msg_error "Pacman config file '${pacman_conf}' does not exist" 1
    fi

    if (( ${#pkg_list[@]} == 0 )); then
        _msg_error "Packages must be specified" 0
        _usage 1
    fi

    _show_config install

    _make_packages
}

command_init() {
    _show_config init
    _chroot_init
}

command_run() {
    _show_config run
    _chroot_run
}

command_build_profile() {
    # Set up essential directory paths
    airootfs_dir="${work_dir}/${arch}/airootfs"
    isofs_dir="${work_dir}/iso"
    # Set ISO file name
    img_name="${iso_name}-${iso_version}-${arch}.iso"

    _print_settings
    _run_once _set_up_directories
    _run_once _make_pacman_conf
    _run_once _export_gpg_publickey
    _run_once _make_custom_airootfs
    _run_once _make_packages
    _run_once _make_customize_airootfs
    _run_once _make_pkglist
    _make_bootmodes
    _run_once _cleanup
    _run_once _make_prepare
    _run_once _make_iso
}

while getopts 'B:p:r:C:L:P:A:D:w:o:s:c:g:vh' arg; do
    case "${arg}" in
        B)
            profile="$(realpath -- "${OPTARG}")"
            _read_profile
            ;;
        p)
            read -r -a opt_pkg_list <<< "${OPTARG}"
            pkg_list+=("${opt_pkg_list[@]}")
            ;;
        r) run_cmd="${OPTARG}" ;;
        C) pacman_conf="$(realpath -- "${OPTARG}")" ;;
        L) iso_label="${OPTARG}" ;;
        P) iso_publisher="${OPTARG}" ;;
        A) iso_application="${OPTARG}" ;;
        D) install_dir="${OPTARG}" ;;
        w) work_dir="$(realpath -- "${OPTARG}")" ;;
        o) out_dir="$(realpath -- "${OPTARG}")" ;;
        s) sfs_mode="${OPTARG}" ;;
        c) sfs_comp="${OPTARG}" ;;
        g) gpg_key="${OPTARG}" ;;
        v) quiet="n" ;;
        h|?) _usage 0 ;;
        *)
            _msg_error "Invalid argument '${arg}'" 0
            _usage 1
            ;;
    esac
done

if (( EUID != 0 )); then
    _msg_error "${app_name} must be run as root." 1
fi

shift $((OPTIND - 1))

if (( $# < 1 )); then
    _msg_error "No command specified" 0
    _usage 1
fi
command_name="${1}"

# Set directory path defaults
airootfs_dir="${work_dir}/airootfs"
isofs_dir="${work_dir}/iso"

case "${command_name}" in
    init)
        _msg_warning "The '${command_name}' command is deprecated!"
        command_init
        ;;
    install)
        _msg_warning "The '${command_name}' command is deprecated!"
        command_install
        ;;
    run)
        _msg_warning "The '${command_name}' command is deprecated!"
        command_run
        ;;
    prepare)
        _msg_warning "The '${command_name}' command is deprecated!"
        command_prepare
        ;;
    pkglist)
        _msg_warning "The '${command_name}' command is deprecated!"
        command_pkglist
        ;;
    iso)
        _msg_warning "The '${command_name}' command is deprecated!"
        if (( $# < 2 )); then
            _msg_error "No image specified" 0
            _usage 1
        fi
        img_name="${2}"
        command_iso
        ;;
    build_profile)
        command_build_profile
        ;;
    *)
        _msg_error "Invalid command name '${command_name}'" 0
        _usage 1
        ;;
esac

# vim:ts=4:sw=4:et: