Introducing shellcheck in gitlab CI

archiso/mkarchiso:
Quoting all variables.
Changing pkg_list to be an array instead of a string for easier
handling. Using read to properly populate pkg_list from OPTARG with
stripped whitespaces.
Not exporting iso_label anymore as there seems to be no reason to do so.
Introducing line breaks.

.editorconfig:
Setting max_line_length to 120.
Adding a section for YAML files (e.g. .gitlab-ci.yml).

configs/releng/build.sh
Quting nearly all variables.
Introducing line breaks.

configs/baseline/build.sh:
Quoting all variables.
Introducing line breaks.

.gitlab-ci.yml:
Adding gitlab CI for shelleck linting of the config build scripts, mkarchiso and startup scripts in releng.

Closes #19

2 files changed, 164 insertions, 110 deletions

diff --git a/configs/baseline/build.sh b/configs/baseline/build.sh
index 7c61d03..ad0b529 100755
--- a/configs/baseline/build.sh
+++ b/configs/baseline/build.sh
@@ -10,15 +10,15 @@ arch=$(uname -m)
 work_dir=work
 out_dir=out
 
-script_path=$(readlink -f ${0%/*})
+script_path=$(readlink -f "${0%/*}")
 
 umask 0022
 
 # Helper function to run make_*() only one time per architecture.
 run_once() {
-    if [[ ! -e ${work_dir}/build.${1}_${arch} ]]; then
-        $1
-        touch ${work_dir}/build.${1}_${arch}
+    if [[ ! -e "${work_dir}/build.${1}_${arch}" ]]; then
+        "$1"
+        touch "${work_dir}/build.${1}_${arch}"
     fi
 }
 
@@ -29,39 +29,42 @@ make_basefs() {
 
 # Copy mkinitcpio archiso hooks and build initramfs (airootfs)
 make_setup_mkinitcpio() {
-    mkdir -p ${work_dir}/airootfs/etc/initcpio/hooks
-    mkdir -p ${work_dir}/airootfs/etc/initcpio/install
-    cp /usr/lib/initcpio/hooks/archiso ${work_dir}/airootfs/etc/initcpio/hooks
-    cp /usr/lib/initcpio/install/archiso ${work_dir}/airootfs/etc/initcpio/install
-    cp ${script_path}/mkinitcpio.conf ${work_dir}/airootfs/etc/mkinitcpio-archiso.conf
-    mkarchiso -v -w "${work_dir}" -D "${install_dir}" -r 'mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img' run
+    mkdir -p "${work_dir}/airootfs/etc/initcpio/hooks"
+    mkdir -p "${work_dir}/airootfs/etc/initcpio/install"
+    cp /usr/lib/initcpio/hooks/archiso "${work_dir}/airootfs/etc/initcpio/hooks"
+    cp /usr/lib/initcpio/install/archiso "${work_dir}/airootfs/etc/initcpio/install"
+    cp "${script_path}/mkinitcpio.conf" "${work_dir}/airootfs/etc/mkinitcpio-archiso.conf"
+    mkarchiso -v -w "${work_dir}" -D "${install_dir}" \
+        -r 'mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img' run
 }
 
 # Prepare ${install_dir}/boot/
 make_boot() {
-    mkdir -p ${work_dir}/iso/${install_dir}/boot/${arch}
-    cp ${work_dir}/airootfs/boot/archiso.img ${work_dir}/iso/${install_dir}/boot/${arch}/archiso.img
-    cp ${work_dir}/airootfs/boot/vmlinuz-linux ${work_dir}/iso/${install_dir}/boot/${arch}/vmlinuz
+    mkdir -p "${work_dir}/iso/${install_dir}/boot/${arch}"
+    cp "${work_dir}/airootfs/boot/archiso.img" "${work_dir}/iso/${install_dir}/boot/${arch}/archiso.img"
+    cp "${work_dir}/airootfs/boot/vmlinuz-linux" "${work_dir}/iso/${install_dir}/boot/${arch}/vmlinuz"
 }
 
 # Prepare /${install_dir}/boot/syslinux
 make_syslinux() {
-    mkdir -p ${work_dir}/iso/${install_dir}/boot/syslinux
+    mkdir -p "${work_dir}/iso/${install_dir}/boot/syslinux"
     sed "s|%ARCHISO_LABEL%|${iso_label}|g;
          s|%INSTALL_DIR%|${install_dir}|g;
-         s|%ARCH%|${arch}|g" ${script_path}/syslinux/syslinux.cfg > ${work_dir}/iso/${install_dir}/boot/syslinux/syslinux.cfg
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/ldlinux.c32 ${work_dir}/iso/${install_dir}/boot/syslinux/
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/menu.c32 ${work_dir}/iso/${install_dir}/boot/syslinux/
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/libutil.c32 ${work_dir}/iso/${install_dir}/boot/syslinux/
+         s|%ARCH%|${arch}|g" "${script_path}/syslinux/syslinux.cfg" > \
+             "${work_dir}/iso/${install_dir}/boot/syslinux/syslinux.cfg"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/ldlinux.c32" "${work_dir}/iso/${install_dir}/boot/syslinux/"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/menu.c32" "${work_dir}/iso/${install_dir}/boot/syslinux/"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/libutil.c32" "${work_dir}/iso/${install_dir}/boot/syslinux/"
 }
 
 # Prepare /isolinux
 make_isolinux() {
-    mkdir -p ${work_dir}/iso/isolinux
-    sed "s|%INSTALL_DIR%|${install_dir}|g" ${script_path}/isolinux/isolinux.cfg > ${work_dir}/iso/isolinux/isolinux.cfg
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/isolinux.bin ${work_dir}/iso/isolinux/
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/isohdpfx.bin ${work_dir}/iso/isolinux/
-    cp ${work_dir}/airootfs/usr/lib/syslinux/bios/ldlinux.c32 ${work_dir}/iso/isolinux/
+    mkdir -p "${work_dir}/iso/isolinux"
+    sed "s|%INSTALL_DIR%|${install_dir}|g" "${script_path}/isolinux/isolinux.cfg" > \
+        "${work_dir}/iso/isolinux/isolinux.cfg"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/isolinux.bin" "${work_dir}/iso/isolinux/"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/isohdpfx.bin" "${work_dir}/iso/isolinux/"
+    cp "${work_dir}/airootfs/usr/lib/syslinux/bios/ldlinux.c32" "${work_dir}/iso/isolinux/"
 }
 
 # Build airootfs filesystem image
@@ -71,7 +74,8 @@ make_prepare() {
 
 # Build ISO
 make_iso() {
-    mkarchiso -v -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -o "${out_dir}" iso "${iso_name}-${iso_version}-${arch}.iso"
+    mkarchiso -v -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -o "${out_dir}" iso \
+        "${iso_name}-${iso_version}-${arch}.iso"
 }
 
 run_once make_basefs
diff --git a/configs/releng/build.sh b/configs/releng/build.sh
index adbfca2..192973e 100755
--- a/configs/releng/build.sh
+++ b/configs/releng/build.sh
@@ -10,10 +10,10 @@ iso_version=$(date +%Y.%m.%d)
 install_dir=arch
 work_dir=work
 out_dir=out
-gpg_key=
+gpg_key=""
 
 verbose=""
-script_path=$(readlink -f ${0%/*})
+script_path=$(readlink -f "${0%/*}")
 
 umask 0022
 
@@ -40,177 +40,227 @@ _usage ()
     echo "                        Default: ${out_dir}"
     echo "    -v                 Enable verbose output"
     echo "    -h                 This help message"
-    exit ${1}
+    exit "${1}"
 }
 
 # Helper function to run make_*() only one time per architecture.
 run_once() {
-    if [[ ! -e ${work_dir}/build.${1} ]]; then
-        $1
-        touch ${work_dir}/build.${1}
+    if [[ ! -e "${work_dir}/build.${1}" ]]; then
+        "$1"
+        touch "${work_dir}/build.${1}"
     fi
 }
 
 # Setup custom pacman.conf with current cache directories.
 make_pacman_conf() {
     local _cache_dirs
-    _cache_dirs=($(pacman -v 2>&1 | grep '^Cache Dirs:' | sed 's/Cache Dirs:\s*//g'))
-    sed -r "s|^#?\\s*CacheDir.+|CacheDir = $(echo -n ${_cache_dirs[@]})|g" ${script_path}/pacman.conf > ${work_dir}/pacman.conf
+    _cache_dirs=("$(pacman -v 2>&1 | grep '^Cache Dirs:' | sed 's/Cache Dirs:\s*//g')")
+    sed -r "s|^#?\\s*CacheDir.+|CacheDir = $(echo -n "${_cache_dirs[@]}")|g" \
+        "${script_path}/pacman.conf" > "${work_dir}/pacman.conf"
 }
 
 # Base installation, plus needed packages (airootfs)
 make_basefs() {
-    mkarchiso ${verbose} -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" init
-    mkarchiso ${verbose} -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" -p "haveged intel-ucode amd-ucode memtest86+ mkinitcpio-nfs-utils nbd zsh" install
+    if [ -n "${verbose}" ]; then
+        mkarchiso -v -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" init
+        mkarchiso -v -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -p "haveged intel-ucode amd-ucode memtest86+ mkinitcpio-nfs-utils nbd zsh" install
+    else
+        mkarchiso -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" init
+        mkarchiso -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -p "haveged intel-ucode amd-ucode memtest86+ mkinitcpio-nfs-utils nbd zsh" install
+    fi
 }
 
 # Additional packages (airootfs)
 make_packages() {
-    mkarchiso ${verbose} -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" -p "$(grep -h -v ^# ${script_path}/packages.x86_64)" install
+    if [ -n "${verbose}" ]; then
+        mkarchiso -v -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -p "$(grep -h -v '^#' "${script_path}/packages.x86_64")" install
+    else
+        mkarchiso -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -p "$(grep -h -v '^#' "${script_path}/packages.x86_64")" install
+    fi
 }
 
 # Copy mkinitcpio archiso hooks and build initramfs (airootfs)
 make_setup_mkinitcpio() {
     local _hook
-    mkdir -p ${work_dir}/x86_64/airootfs/etc/initcpio/hooks
-    mkdir -p ${work_dir}/x86_64/airootfs/etc/initcpio/install
+    mkdir -p "${work_dir}/x86_64/airootfs/etc/initcpio/hooks"
+    mkdir -p "${work_dir}/x86_64/airootfs/etc/initcpio/install"
     for _hook in archiso archiso_shutdown archiso_pxe_common archiso_pxe_nbd archiso_pxe_http archiso_pxe_nfs archiso_loop_mnt; do
-        cp /usr/lib/initcpio/hooks/${_hook} ${work_dir}/x86_64/airootfs/etc/initcpio/hooks
-        cp /usr/lib/initcpio/install/${_hook} ${work_dir}/x86_64/airootfs/etc/initcpio/install
+        cp "/usr/lib/initcpio/hooks/${_hook}" "${work_dir}/x86_64/airootfs/etc/initcpio/hooks"
+        cp "/usr/lib/initcpio/install/${_hook}" "${work_dir}/x86_64/airootfs/etc/initcpio/install"
     done
-    sed -i "s|/usr/lib/initcpio/|/etc/initcpio/|g" ${work_dir}/x86_64/airootfs/etc/initcpio/install/archiso_shutdown
-    cp /usr/lib/initcpio/install/archiso_kms ${work_dir}/x86_64/airootfs/etc/initcpio/install
-    cp /usr/lib/initcpio/archiso_shutdown ${work_dir}/x86_64/airootfs/etc/initcpio
-    cp ${script_path}/mkinitcpio.conf ${work_dir}/x86_64/airootfs/etc/mkinitcpio-archiso.conf
-    gnupg_fd=
-    if [[ ${gpg_key} ]]; then
-      gpg --export ${gpg_key} >${work_dir}/gpgkey
-      exec 17<>${work_dir}/gpgkey
+    sed -i "s|/usr/lib/initcpio/|/etc/initcpio/|g" "${work_dir}/x86_64/airootfs/etc/initcpio/install/archiso_shutdown"
+    cp /usr/lib/initcpio/install/archiso_kms "${work_dir}/x86_64/airootfs/etc/initcpio/install"
+    cp /usr/lib/initcpio/archiso_shutdown "${work_dir}/x86_64/airootfs/etc/initcpio"
+    cp "${script_path}/mkinitcpio.conf" "${work_dir}/x86_64/airootfs/etc/mkinitcpio-archiso.conf"
+    if [[ "${gpg_key}" ]]; then
+      gpg --export "${gpg_key}" > "${work_dir}/gpgkey"
+      exec 17<>"${work_dir}/gpgkey"
+    fi
+    if [ -n "${verbose}" ]; then
+        ARCHISO_GNUPG_FD="${gpg_key:+17}" mkarchiso -v -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" \
+            -D "${install_dir}" \
+            -r 'mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img' run
+    else
+        ARCHISO_GNUPG_FD="${gpg_key:+17}" mkarchiso -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" \
+            -D "${install_dir}" \
+            -r 'mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img' run
     fi
-    ARCHISO_GNUPG_FD=${gpg_key:+17} mkarchiso ${verbose} -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" -r 'mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img' run
-    if [[ ${gpg_key} ]]; then
+    if [[ "${gpg_key}" ]]; then
       exec 17<&-
     fi
 }
 
 # Customize installation (airootfs)
 make_customize_airootfs() {
-    cp -af --no-preserve=ownership ${script_path}/airootfs ${work_dir}/x86_64
+    cp -af --no-preserve=ownership "${script_path}/airootfs" "${work_dir}/x86_64"
 
-    cp ${script_path}/pacman.conf ${work_dir}/x86_64/airootfs/etc
+    cp "${script_path}/pacman.conf" "${work_dir}/x86_64/airootfs/etc"
 
-    curl -o ${work_dir}/x86_64/airootfs/etc/pacman.d/mirrorlist 'https://www.archlinux.org/mirrorlist/?country=all&protocol=http&use_mirror_status=on'
+    curl -o "${work_dir}/x86_64/airootfs/etc/pacman.d/mirrorlist" \
+        'https://www.archlinux.org/mirrorlist/?country=all&protocol=http&use_mirror_status=on'
 
-    lynx -dump -nolist 'https://wiki.archlinux.org/index.php/Installation_Guide?action=render' >> ${work_dir}/x86_64/airootfs/root/install.txt
+    lynx -dump -nolist 'https://wiki.archlinux.org/index.php/Installation_Guide?action=render' >> \
+        "${work_dir}/x86_64/airootfs/root/install.txt"
 
-    mkarchiso ${verbose} -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" -r '/root/customize_airootfs.sh' run
-    rm ${work_dir}/x86_64/airootfs/root/customize_airootfs.sh
+    if [ -n "${verbose}" ]; then
+        mkarchiso -v -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -r '/root/customize_airootfs.sh' run
+    else
+        mkarchiso -w "${work_dir}/x86_64" -C "${work_dir}/pacman.conf" -D "${install_dir}" \
+            -r '/root/customize_airootfs.sh' run
+    fi
+    rm "${work_dir}/x86_64/airootfs/root/customize_airootfs.sh"
 }
 
 # Prepare kernel/initramfs ${install_dir}/boot/
 make_boot() {
-    mkdir -p ${work_dir}/iso/${install_dir}/boot/x86_64
-    cp ${work_dir}/x86_64/airootfs/boot/archiso.img ${work_dir}/iso/${install_dir}/boot/x86_64/archiso.img
-    cp ${work_dir}/x86_64/airootfs/boot/vmlinuz-linux ${work_dir}/iso/${install_dir}/boot/x86_64/vmlinuz
+    mkdir -p "${work_dir}/iso/${install_dir}/boot/x86_64"
+    cp "${work_dir}/x86_64/airootfs/boot/archiso.img" "${work_dir}/iso/${install_dir}/boot/x86_64/archiso.img"
+    cp "${work_dir}/x86_64/airootfs/boot/vmlinuz-linux" "${work_dir}/iso/${install_dir}/boot/x86_64/vmlinuz"
 }
 
 # Add other aditional/extra files to ${install_dir}/boot/
 make_boot_extra() {
-    cp ${work_dir}/x86_64/airootfs/boot/memtest86+/memtest.bin ${work_dir}/iso/${install_dir}/boot/memtest
-    cp ${work_dir}/x86_64/airootfs/usr/share/licenses/common/GPL2/license.txt ${work_dir}/iso/${install_dir}/boot/memtest.COPYING
-    cp ${work_dir}/x86_64/airootfs/boot/intel-ucode.img ${work_dir}/iso/${install_dir}/boot/intel_ucode.img
-    cp ${work_dir}/x86_64/airootfs/usr/share/licenses/intel-ucode/LICENSE ${work_dir}/iso/${install_dir}/boot/intel_ucode.LICENSE
-    cp ${work_dir}/x86_64/airootfs/boot/amd-ucode.img ${work_dir}/iso/${install_dir}/boot/amd_ucode.img
-    cp ${work_dir}/x86_64/airootfs/usr/share/licenses/amd-ucode/LICENSE ${work_dir}/iso/${install_dir}/boot/amd_ucode.LICENSE
+    cp "${work_dir}/x86_64/airootfs/boot/memtest86+/memtest.bin" "${work_dir}/iso/${install_dir}/boot/memtest"
+    cp "${work_dir}/x86_64/airootfs/usr/share/licenses/common/GPL2/license.txt" \
+        "${work_dir}/iso/${install_dir}/boot/memtest.COPYING"
+    cp "${work_dir}/x86_64/airootfs/boot/intel-ucode.img" "${work_dir}/iso/${install_dir}/boot/intel_ucode.img"
+    cp "${work_dir}/x86_64/airootfs/usr/share/licenses/intel-ucode/LICENSE" \
+        "${work_dir}/iso/${install_dir}/boot/intel_ucode.LICENSE"
+    cp "${work_dir}/x86_64/airootfs/boot/amd-ucode.img" "${work_dir}/iso/${install_dir}/boot/amd_ucode.img"
+    cp "${work_dir}/x86_64/airootfs/usr/share/licenses/amd-ucode/LICENSE" \
+        "${work_dir}/iso/${install_dir}/boot/amd_ucode.LICENSE"
 }
 
 # Prepare /${install_dir}/boot/syslinux
 make_syslinux() {
-    _uname_r=$(file -b ${work_dir}/x86_64/airootfs/boot/vmlinuz-linux| awk 'f{print;f=0} /version/{f=1}' RS=' ')
-    mkdir -p ${work_dir}/iso/${install_dir}/boot/syslinux
-    for _cfg in ${script_path}/syslinux/*.cfg; do
+    _uname_r=$(file -b "${work_dir}/x86_64/airootfs/boot/vmlinuz-linux"| awk 'f{print;f=0} /version/{f=1}' RS=' ')
+    mkdir -p "${work_dir}/iso/${install_dir}/boot/syslinux"
+    for _cfg in "${script_path}/syslinux/"*.cfg; do
         sed "s|%ARCHISO_LABEL%|${iso_label}|g;
-             s|%INSTALL_DIR%|${install_dir}|g" ${_cfg} > ${work_dir}/iso/${install_dir}/boot/syslinux/${_cfg##*/}
+             s|%INSTALL_DIR%|${install_dir}|g" "${_cfg}" > "${work_dir}/iso/${install_dir}/boot/syslinux/${_cfg##*/}"
     done
-    cp ${script_path}/syslinux/splash.png ${work_dir}/iso/${install_dir}/boot/syslinux
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/*.c32 ${work_dir}/iso/${install_dir}/boot/syslinux
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/lpxelinux.0 ${work_dir}/iso/${install_dir}/boot/syslinux
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/memdisk ${work_dir}/iso/${install_dir}/boot/syslinux
-    mkdir -p ${work_dir}/iso/${install_dir}/boot/syslinux/hdt
-    gzip -c -9 ${work_dir}/x86_64/airootfs/usr/share/hwdata/pci.ids > ${work_dir}/iso/${install_dir}/boot/syslinux/hdt/pciids.gz
-    gzip -c -9 ${work_dir}/x86_64/airootfs/usr/lib/modules/${_uname_r}/modules.alias > ${work_dir}/iso/${install_dir}/boot/syslinux/hdt/modalias.gz
+    cp "${script_path}/syslinux/splash.png" "${work_dir}/iso/${install_dir}/boot/syslinux"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/"*.c32 "${work_dir}/iso/${install_dir}/boot/syslinux"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/lpxelinux.0" "${work_dir}/iso/${install_dir}/boot/syslinux"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/memdisk" "${work_dir}/iso/${install_dir}/boot/syslinux"
+    mkdir -p "${work_dir}/iso/${install_dir}/boot/syslinux/hdt"
+    gzip -c -9 "${work_dir}/x86_64/airootfs/usr/share/hwdata/pci.ids" > \
+        "${work_dir}/iso/${install_dir}/boot/syslinux/hdt/pciids.gz"
+    gzip -c -9 "${work_dir}/x86_64/airootfs/usr/lib/modules/${_uname_r}/modules.alias" > \
+        "${work_dir}/iso/${install_dir}/boot/syslinux/hdt/modalias.gz"
 }
 
 # Prepare /isolinux
 make_isolinux() {
-    mkdir -p ${work_dir}/iso/isolinux
-    sed "s|%INSTALL_DIR%|${install_dir}|g" ${script_path}/isolinux/isolinux.cfg > ${work_dir}/iso/isolinux/isolinux.cfg
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/isolinux.bin ${work_dir}/iso/isolinux/
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/isohdpfx.bin ${work_dir}/iso/isolinux/
-    cp ${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/ldlinux.c32 ${work_dir}/iso/isolinux/
+    mkdir -p "${work_dir}/iso/isolinux"
+    sed "s|%INSTALL_DIR%|${install_dir}|g" \
+        "${script_path}/isolinux/isolinux.cfg" > "${work_dir}/iso/isolinux/isolinux.cfg"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/isolinux.bin" "${work_dir}/iso/isolinux/"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/isohdpfx.bin" "${work_dir}/iso/isolinux/"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/syslinux/bios/ldlinux.c32" "${work_dir}/iso/isolinux/"
 }
 
 # Prepare /EFI
 make_efi() {
-    mkdir -p ${work_dir}/iso/EFI/boot
-    cp ${work_dir}/x86_64/airootfs/usr/lib/systemd/boot/efi/systemd-bootx64.efi ${work_dir}/iso/EFI/boot/bootx64.efi
+    mkdir -p "${work_dir}/iso/EFI/boot"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/systemd/boot/efi/systemd-bootx64.efi" \
+        "${work_dir}/iso/EFI/boot/bootx64.efi"
 
-    mkdir -p ${work_dir}/iso/loader/entries
-    cp ${script_path}/efiboot/loader/loader.conf ${work_dir}/iso/loader/
+    mkdir -p "${work_dir}/iso/loader/entries"
+    cp "${script_path}/efiboot/loader/loader.conf" "${work_dir}/iso/loader/"
 
     sed "s|%ARCHISO_LABEL%|${iso_label}|g;
          s|%INSTALL_DIR%|${install_dir}|g" \
-        ${script_path}/efiboot/loader/entries/archiso-x86_64-usb.conf > ${work_dir}/iso/loader/entries/archiso-x86_64.conf
+        "${script_path}/efiboot/loader/entries/archiso-x86_64-usb.conf" > \
+        "${work_dir}/iso/loader/entries/archiso-x86_64.conf"
 
     # edk2-shell based UEFI shell
     # shellx64.efi is picked up automatically when on /
-    cp /usr/share/edk2-shell/x64/Shell_Full.efi ${work_dir}/iso/shellx64.efi
+    cp /usr/share/edk2-shell/x64/Shell_Full.efi "${work_dir}/iso/shellx64.efi"
 }
 
 # Prepare efiboot.img::/EFI for "El Torito" EFI boot mode
 make_efiboot() {
-    mkdir -p ${work_dir}/iso/EFI/archiso
-    truncate -s 64M ${work_dir}/iso/EFI/archiso/efiboot.img
-    mkfs.fat -n ARCHISO_EFI ${work_dir}/iso/EFI/archiso/efiboot.img
+    mkdir -p "${work_dir}/iso/EFI/archiso"
+    truncate -s 64M "${work_dir}/iso/EFI/archiso/efiboot.img"
+    mkfs.fat -n ARCHISO_EFI "${work_dir}/iso/EFI/archiso/efiboot.img"
 
-    mkdir -p ${work_dir}/efiboot
-    mount ${work_dir}/iso/EFI/archiso/efiboot.img ${work_dir}/efiboot
+    mkdir -p "${work_dir}/efiboot"
+    mount "${work_dir}/iso/EFI/archiso/efiboot.img" "${work_dir}/efiboot"
 
-    mkdir -p ${work_dir}/efiboot/EFI/archiso
-    cp ${work_dir}/iso/${install_dir}/boot/x86_64/vmlinuz ${work_dir}/efiboot/EFI/archiso/vmlinuz.efi
-    cp ${work_dir}/iso/${install_dir}/boot/x86_64/archiso.img ${work_dir}/efiboot/EFI/archiso/archiso.img
+    mkdir -p "${work_dir}/efiboot/EFI/archiso"
+    cp "${work_dir}/iso/${install_dir}/boot/x86_64/vmlinuz" "${work_dir}/efiboot/EFI/archiso/vmlinuz.efi"
+    cp "${work_dir}/iso/${install_dir}/boot/x86_64/archiso.img" "${work_dir}/efiboot/EFI/archiso/archiso.img"
 
-    cp ${work_dir}/iso/${install_dir}/boot/intel_ucode.img ${work_dir}/efiboot/EFI/archiso/intel_ucode.img
-    cp ${work_dir}/iso/${install_dir}/boot/amd_ucode.img ${work_dir}/efiboot/EFI/archiso/amd_ucode.img
+    cp "${work_dir}/iso/${install_dir}/boot/intel_ucode.img" "${work_dir}/efiboot/EFI/archiso/intel_ucode.img"
+    cp "${work_dir}/iso/${install_dir}/boot/amd_ucode.img" "${work_dir}/efiboot/EFI/archiso/amd_ucode.img"
 
-    mkdir -p ${work_dir}/efiboot/EFI/boot
-    cp ${work_dir}/x86_64/airootfs/usr/lib/systemd/boot/efi/systemd-bootx64.efi ${work_dir}/efiboot/EFI/boot/bootx64.efi
+    mkdir -p "${work_dir}/efiboot/EFI/boot"
+    cp "${work_dir}/x86_64/airootfs/usr/lib/systemd/boot/efi/systemd-bootx64.efi" \
+        "${work_dir}/efiboot/EFI/boot/bootx64.efi"
 
-    mkdir -p ${work_dir}/efiboot/loader/entries
-    cp ${script_path}/efiboot/loader/loader.conf ${work_dir}/efiboot/loader/
+    mkdir -p "${work_dir}/efiboot/loader/entries"
+    cp "${script_path}/efiboot/loader/loader.conf" "${work_dir}/efiboot/loader/"
 
     sed "s|%ARCHISO_LABEL%|${iso_label}|g;
          s|%INSTALL_DIR%|${install_dir}|g" \
-        ${script_path}/efiboot/loader/entries/archiso-x86_64-cd.conf > ${work_dir}/efiboot/loader/entries/archiso-x86_64.conf
+        "${script_path}/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 /
-    cp ${work_dir}/iso/shellx64.efi ${work_dir}/efiboot/
+    cp "${work_dir}/iso/shellx64.efi" "${work_dir}/efiboot/"
 
-    umount -d ${work_dir}/efiboot
+    umount -d "${work_dir}/efiboot"
 }
 
 # Build airootfs filesystem image
 make_prepare() {
-    cp -a -l -f ${work_dir}/x86_64/airootfs ${work_dir}
-    mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" pkglist
-    mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" ${gpg_key:+-g ${gpg_key}} prepare
-    rm -rf ${work_dir}/airootfs
-    # rm -rf ${work_dir}/x86_64/airootfs (if low space, this helps)
+    cp -a -l -f "${work_dir}/x86_64/airootfs" "${work_dir}"
+    if [ -n "${verbose}" ]; then
+        mkarchiso -v -w "${work_dir}" -D "${install_dir}" pkglist
+        mkarchiso -v -w "${work_dir}" -D "${install_dir}" ${gpg_key:+-g ${gpg_key}} prepare
+    else
+        mkarchiso -w "${work_dir}" -D "${install_dir}" pkglist
+        mkarchiso -w "${work_dir}" -D "${install_dir}" ${gpg_key:+-g ${gpg_key}} prepare
+    fi
+    rm -rf "${work_dir}/airootfs"
+    # rm -rf "${work_dir}/x86_64/airootfs" (if low space, this helps)
 }
 
 # Build ISO
 make_iso() {
-    mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -P "${iso_publisher}" -A "${iso_application}" -o "${out_dir}" iso "${iso_name}-${iso_version}-x86_64.iso"
+    if [ -n "${verbose}" ]; then
+        mkarchiso -v -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -P "${iso_publisher}" \
+            -A "${iso_application}" -o "${out_dir}" iso "${iso_name}-${iso_version}-x86_64.iso"
+    else
+        mkarchiso -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -P "${iso_publisher}" \
+            -A "${iso_application}" -o "${out_dir}" iso "${iso_name}-${iso_version}-x86_64.iso"
+    fi
 }
 
 if [[ ${EUID} -ne 0 ]]; then
@@ -238,7 +288,7 @@ while getopts 'N:V:L:P:A:D:w:o:g:vh' arg; do
     esac
 done
 
-mkdir -p ${work_dir}
+mkdir -p "${work_dir}"
 
 run_once make_pacman_conf
 run_once make_basefs