al-installer/installer

#!/bin/bash

# This program is free software, provided under the GNU GPL
# Written by Nathaniel Maia for Archlabs, works in most Arch based distros
# Some ideas and code reworked from other resources
# AIF, Calamares, and the Arch Wiki.. Credit where credit is due

# shellcheck disable=SC2086,SC2046,SC2254,SC2164
VER=2.1.50

# default values {

: "${DIST=ArchLabs}"               # distro name if not set
: "${MNT=/mnt}"                    # installation root mountpoint if not set
ANS=/tmp/ans                       # dialog answer output file
FONT=ter-i16n                      # font used for the linux console
HOOKS=shutdown                     # additional mkinitcpio HOOKS
SEL=0                              # currently selected menu item
PACSTRAP=1                         # use a fresh pacstrap or copy the iso filesystem
SYS=Unknown                        # bios type, to be determined: UEFI/BIOS
BG=/tmp/bgout                      # output from background process
ERR=/tmp/errlog                    # stderr log used internally by errshow()
DBG=/tmp/debuglog                  # debug log file when passed -d
RUN=/run/archiso/bootmnt/arch/boot # path for live system /boot
BTRFS=0                            # is btrfs used, 1 = btrfs alone, 2 = btrfs + subvolume(s)
EXMNTS=""                          # extra partitions that were mounted, used to verify mountpoint and show user
USER_CMD=""                        # optional command(s) entered by the user to run in the chroot
VM="$(systemd-detect-virt)"        # system running in a virtual machine

export DIALOGOPTS="--cr-wrap"      # dialog environment variable to hold default options, see `man dialog`

# package arrays built later from user selections
typeset -a SES_PKGS USER_PKGS

# packages installed specific to archlabs, installed when any session is chosen {
typeset -a BASE_PKGS=(
"alsa-firmware"
"alsa-lib"
"alsa-plugins"
"archlabs-baph"
"archlabs-fonts"
"archlabs-icons"
"archlabs-keyring"
"archlabs-keyring"
"archlabs-scripts"
"archlabs-skel-base"
"archlabs-themes"
"archlabs-wallpapers"
"ffmpeg"
"gst-libav"
"gst-plugins-base"
"gst-plugins-good"
"gstreamer"
"gtk3"
"gvfs"
"libmad"
"libmatroska"
"pamixer"
"pavucontrol"
"pulseaudio"
"pulseaudio-alsa"
"scrot"
"sudo"
"xdg-user-dirs"
"xorg-drivers" # TODO: should we only install specific drivers?
"xorg-font-utils"
"xorg-iceauth"
"xorg-server"
"xorg-server-common"
"xorg-setxkbmap"
"xorg-xauth"
"xorg-xbacklight"
"xorg-xinput"
"xorg-xkbcomp"
"xorg-xkill"
"xorg-xmodmap"
"xorg-xprop"
"xorg-xrandr"
"xorg-xrdb"
"xorg-xset"
"xorg-xsetroot"
"xterm"
) # }

# packages installed for most window managers to provide some basic functionality {
typeset -a WM_PKGS=(
"arandr"
"dunst"
"exo"
"feh"
"gnome-keyring"
"gsimplecal"
"network-manager-applet"
"nitrogen"
"polkit-gnome"
"picom"
"volumeicon"
"wmctrl"
"xclip"
"xdotool"
"xfce4-power-manager"
"xfce4-settings"
) # }

# packages installed when choosing to use pacstrap {
typeset -a ISO_PKGS=(
"arch-install-scripts"
"crda"
"ddrescue"
"dhclient"
"dhcpcd"
"diffutils"
"dmraid"
"dnsmasq"
"dnsutils"
"dosfstools"
"ethtool"
"exfat-utils"
"f2fs-tools"
"fsarchiver"
"hdparm"
"iputils"
"ipw2100-fw"
"ipw2200-fw"
"iwd"
"lftp"
"linux-firmware"
"lm_sensors"
"lsb-release"
"lsscsi"
"man-db"
"man-pages"
"mdadm"
"mtools"
"nfs-utils"
"nilfs-utils"
"ntp"
"openconnect"
"openssh"
"openvpn"
"p7zip"
"pacman-contrib"
"partclone"
"parted"
"partimage"
"ppp"
"pptpclient"
"reflector"
"rp-pppoe"
"sdparm"
"sg3_utils"
"tcpdump"
"terminus-font"
"testdisk"
"ttf-dejavu"
"usb_modeswitch"
"usbutils"
"vi"
"wireless-regdb"
"wireless_tools"
"wpa_supplicant"
"wvdial"
) # }

SYS_MEM="$(awk '/MemTotal/ {print int($2 / 1024) "M"}' /proc/meminfo)"
LOCALES="$(awk '/\.UTF-8/ {gsub(/# .*|#/, ""); if ($1) {print $1 " - "}}' /etc/locale.gen)"
CMAPS="$(find /usr/share/kbd/keymaps -name '*.map.gz' | awk '{gsub(/\.map\.gz|.*\//, ""); print $1 " - "}' | sort)"

[[ $LINES ]] || LINES=$(tput lines)
[[ $COLUMNS ]] || COLUMNS=$(tput cols)

# }

# commands used to install each bootloader, however most get modified during runtime {
declare -A BCMDS=(
[efistub]='efibootmgr -v -d /dev/sda -p 1 -c -l'
[grub]='grub-install --recheck --force'
[refind-efi]='refind-install'
[syslinux]='syslinux-install_update -i -a -m'
[systemd-boot]='bootctl --path=/boot install'
) # }

# sessions that provide their own super bind and set the wallpaper {
declare WM_PKG_SES='openbox|bspwm|i3-gaps|fluxbox|jwm|awesome'
declare SELF_CONTAINED='plasma|gnome|cinnamon|deepin'
declare SELF_CONTAINED_SES='startplasma-x11|gnome-session|startdde|cinnamon-session'
# }

# executable name for each wm/de used in ~/.xinitrc {
declare -A WM_SESSIONS=(
[awesome]='awesome'
[bspwm]='bspwm'
[cinnamon]='cinnamon-session'
[deepin]='startdde'
[dwm]='dwm'
[fluxbox]='startfluxbox'
[gnome]='gnome-session'
[i3-gaps]='i3'
[jwm]='jwm'
[lxqt]='startlxqt'
[openbox]='openbox-session'
[plasma]='startplasma-x11'
[xfce4]='startxfce4'
) # }

# Packages installed for each wm/de, most are depends of the skel packages {
declare -A WM_EXT=(
[awesome]='archlabs-skel-awesome'
[bspwm]='archlabs-skel-bspwm'
[cinnamon]='gnome-terminal'
[deepin]='deepin-extra'
[dwm]='nitrogen polkit-gnome gnome-keyring dunst lxappearance'
[fluxbox]='archlabs-skel-fluxbox'
[gnome]='gnome-tweaks'
[i3-gaps]='archlabs-skel-i3-gaps'
[jwm]=''
[lxqt]='breeze-icons picom libpulse network-manager-applet'
[openbox]='archlabs-skel-openbox'
[plasma]='kde-applications-meta powerdevil'
[xfce4]='archlabs-skel-xfce4 xfce4-goodies'
) # }

# files offered for editing after install is complete {
declare -A EDIT_FILES=(
[login]='' # login is populated once we know the username and shell
[fstab]='/etc/fstab'
[sudoers]='/etc/sudoers'
[crypttab]='/etc/crypttab'
[pacman]='/etc/pacman.conf'
[console]='/etc/vconsole.conf'
[mkinitcpio]='/etc/mkinitcpio.conf'
[hostname]='/etc/hostname /etc/hosts'
[bootloader]="/boot/loader/entries/$DIST.conf"  # ** based on bootloader
[locale]='/etc/locale.conf /etc/default/locale'
[keyboard]='/etc/X11/xorg.conf.d/00-keyboard.conf /etc/default/keyboard'
) # }

# mkfs command flags for filesystem formatting {
declare -A FS_CMD_FLAGS=(
[btrfs]='-fq'
[ext2]='-q'
[ext3]='-q'
[ext4]='-q'
[f2fs]='-f'
[jfs]='-q'
[nilfs2]='-q'
[ntfs]='-q'
[reiserfs]='-q'
[vfat]='-F32'
[xfs]='-fq'
) # }

# mount options for each filesystem {
declare -A FS_OPTS=(
[vfat]=''
[ntfs]=''
[ext2]=''
[ext3]=''
[jfs]='discard errors=continue errors=panic nointegrity'
[reiserfs]='acl nolog notail replayonly user_xattr off'
[ext4]='discard dealloc nofail noacl relatime noatime nobarrier nodelalloc'
[xfs]='discard filestreams ikeep largeio noalign nobarrier norecovery noquota wsync'
[nilfs2]='discard nobarrier errors=continue errors=panic order=relaxed order=strict norecovery'
[f2fs]='discard fastboot flush_merge data_flush inline_xattr inline_data noinline_data inline_dentry no_heap noacl nobarrier norecovery noextent_cache disable_roll_forward disable_ext_identify'
[btrfs]='autodefrag compress=zlib compress=lzo compress=no compress-force=zlib compress-force=lzo discard noacl noatime nodatasum nospace_cache recovery skip_balance space_cache ssd ssd_spread'
) # }

# packages installed for each login option {
declare -A LOGIN_PKGS=(
[gdm]='gdm'
[lightdm]='lightdm lightdm-gtk-greeter lightdm-gtk-greeter-settings accountsservice'
[sddm]='sddm'
[xinit]='xorg-xinit'
) # }

# extras installed for user selected packages {
# if a package requires additional packages that aren't already dependencies
# they can be added here e.g. [package]="extra"
declare -A PKG_EXT=(
[bluez]='bluez-libs bluez-utils bluez-tools bluez-plugins bluez-hid2hci'
[cairo-dock]='cairo-dock-plug-ins'
[kdenlive]='qt5ct qt5-styleplugins'
[mpd]='mpc'
[mupdf]='mupdf-tools'
[noto-fonts]='noto-fonts-emoji'
[pcmanfm]='tumbler'
[qbittorrent]='qt5ct qt5-styleplugins'
[qt5ct]='qt5-styleplugins'
[qutebrowser]='qt5ct qt5-styleplugins'
[thunar]='tumbler thunar-volman'
[transmission-qt]='qt5ct qt5-styleplugins'
[vlc]='qt5ct qt5-styleplugins'
[zathura]='zathura-pdf-poppler'
) # }

# dialog text variables {
# Basics (somewhat in order)
_keymap="\nSelect which keymap to use from the list below.\n\nThis will determine the installed system keymap, NOT locale which is chosen later.\n\nSystem default: us"
_vconsole="\nSelect the console keymap, the console is the tty shell you reach before starting a graphical environment (Xorg).\n\nIts keymap is separate from the one used by the graphical environments, though many do use the same such as 'us' English.\n\nSystem default: us"
_prep="\nThis is the installer main menu, once a step is complete you will return here.\n\nOn successful completion of a step the cursor will advance to the next step.\nOn failure the cursor will be placed on the step required to advance (when possible).\n\nSteps beginning with an asterisk (*) are required.\n\nOnce all required steps are complete, selecting the last step will finalize the install."
_device="\nSelect a device to use from the list below.\n\nDevices (/dev) are the available drives on the system. /sda, /sdb, /sdc ..."
_mount="\nUse [Space] to toggle mount options from below, press [Enter] when done to confirm selection.\n\nNot selecting any and confirming will run an automatic mount."
_warn="\nIMPORTANT: Choose carefully when editing, formatting, and mounting partitions or your DATA MAY BE LOST.\n\nTo mount a partition without formatting it, select 'skip' when prompted to choose a file system during the mounting stage.\nThis can only be used for partitions that already contain a file system and cannot be the root (/) partition, it needs to be formatted before install.\n"
_part="\nFull device auto partitioning is available for beginners otherwise cfdisk is recommended.\n\n  - All systems will require a root partition (8G or greater).\n  - UEFI or BIOS using LUKS without LVM require a separate boot partition (100-512M)."
_btrfs="\nBtrfs can be used with or without creating subvolumes.\n\nAn initial subvolume will be created and mounted with additional subvolumes branching from this created after.\n\nCreate subvolumes?\n"
_uefi="\nSelect the EFI boot partition (/boot), required for UEFI boot.\n\nIt's usually the first partition on the device, 100-512M, and will be formatted as vfat/fat32 if not already."
_bios="\nDo you want to use a separate boot partition? (optional)\n\nIt's usually the first partition on the device, 100-512M, and will be formatted as ext3/4 if not already."
_biosluks="\nSelect the boot partition (/boot), required for LUKS.\n\nIt's usually the first partition on the device, 100-512M, and will be formatted as ext3/4 if not already."
_format="is already formatted correctly.\n\nFor a clean install, existing partitions should be formatted, however this removes ALL data (bootloaders) on the partition so choose carefully.\n\nDo you want to format the partition?\n"
_swapsize="\nEnter the size of the swapfile in megabytes (M) or gigabytes (G).\n\ne.g. 100M will create a 100 megabyte swapfile, while 10G will create a 10 gigabyte swapfile.\n\nFor ease of use and as an example it is filled in to match the size of your system memory (RAM).\n\nMust be greater than 1, contain only whole numbers, and end with either M or G."
_expart="\nYou can now choose any additional partitions you want mounted, you'll be asked for a mountpoint after.\n\nSelect 'done' to finish the mounting step and begin unpacking the base system in the background."
_exmnt="\nWhere do you want the partition mounted?\n\nEnsure the name begins with a slash (/).\nExamples include: /usr, /home, /var, etc."
_mirrors="\nAutomatic mirror selection using reflector is preferred and should yield fast mirrors, however\nyou may want to select which countries mirrors to use for faster sorting and more control\n\nUse automatic mirrors?\n"
_bginstall="\nThe background base install will now start, select which base to use\n\nPacstrap - downloads all packages, avoids issues but can be slower depending on your network.\n\nCopy ISO - faster and not network dependant but can result in installation issues when using an older ISO.\n"
_user="\nEnter a name and password for the new user account.\n\nThe name must not use capital letters, contain any periods (.), end with a hyphen (-), or include any colons (:)\n\nNOTE: Use [Up], [Down], or [Tab] to switch between fields, and [Enter] to accept."
_hostname="\nEnter a hostname for the new system.\n\nA hostname is used to identify systems on the network.\n\nIt's restricted to alphanumeric characters (a-z, A-Z, 0-9).\nIt can contain hyphens (-) BUT NOT at the beginning or end."
_locale="\nLocale determines the system language and currency formats.\n\nThe format for locale names is languagecode_COUNTRYCODE\n\ne.g. en_US is: English United States\n    en_GB is: English Great Britain"
_timez="\nSelect your timezone country or continent from the list below"
_timesubz="\nSelect your time zone city.\n\nTIP: Pressing a letter key repeatedly navigates between entries beginning with that letter."
_sessions="\nUse [Space] to toggle available sessions, use [Enter] to accept the selection and continue.\n\nA basic package set will be installed for compatibility and functionality."
_login="\nSelect which of your session choices to use for the initial login.\n\nYou can be change this later by editing your ~/.xinitrc"
_autologin="\nDo you want autologin enabled for USER?\n\nIf so the following two files will be created (disable autologin by removing them):\n\n - /home/USER/RC (run startx when logging in on tty1)\n - /etc/systemd/system/getty@tty1.service.d/autologin.conf (login USER without password)\n"
_packages="\nUse [Space] to toggle packages then press [Enter] to accept.\n\nPackages may be installed by your DE/WM (if any), or for the packages you select."
_usercmd="\nEnter command to be run in the newly installed system (chroot) below.\n\nAn example use case would be installing packages or editing files not offered in the menus.\n\nBecause the command will be run in a chroot not every command will function correctly, additionally the command will not be sanity checked, it's your system so exercise caution.\n\nMore than one command may be run using standard bash syntax.\n"
_edit="\nBefore exiting you can select configuration files to review/change.\n\nIf you need to make other changes with the drives still mounted, use Ctrl-z to pause the installer, when finished type 'fg' and [Enter] to resume the installer, if you want to avoid the automatic reboot using Ctrl-c will cleanly exit."

# LUKS
_luksmenu="\nA separate boot partition without encryption or logical volume management (LVM) is required (except BIOS systems using grub).\n\nBasic uses the default encryption settings, and is recommended for beginners. Advanced allows cypher and key size parameters to be entered manually."
_luksomenu="\nEnter a name and password for the encrypted device.\n\nIt is not necessary to prefix the name with /dev/mapper/, an example has been provided."
_lukskey="Once the specified flags have been amended, they will automatically be used with the 'cryptsetup -q luksFormat /dev/...' command.\n\nNOTE: Do not specify any additional flags such as -v (--verbose) or -y (--verify-passphrase)."

# LVM
_lvmmenu="\nLogical volume management (LVM) allows 'virtual' drives (volume groups) and partitions (logical volumes)\nto be created from existing device partitions. A volume group must be created first, then one or more logical volumes within it.\n\nLVM can also be used with a LUKS partition to create multiple logical volumes (e.g. root and home) within it."
_lvmvgname="\nEnter a name for the volume group (VG) being created from the partition(s) selected."
_lvmlvname="\nEnter a name for the logical volume (LV) being created.\n\nThis is similar to setting a label for a partition."
_lvmlvsize="\nEnter what size you want the logical volume (LV) to be in megabytes (M) or gigabytes (G).\n\ne.g. 100M will create a 100 megabyte volume, 10G will create a 10 gigabyte volume."
_lvmdelask="\nConfirm deletion of volume group(s) and logical volume(s).\n\nDeleting a volume group, will delete all logical volumes within it.\n"

# Errors
_errexpart="\nCannot mount partition due to a problem with the mountpoint.\n\nEnsure it begins with a slash (/) followed by at least one character.\n"
_errpart="\nYou need to create partition(s) first.\n\n\nBIOS systems require at least one partition (ROOT).\n\nUEFI systems require at least two (ROOT and EFI).\n"
_errchoice="\nIf you want to fix the issue yourself use Ctrl-z to pause the installer.\nFrom there you can do whatever is needed to resolve the error.\nOnce finished use the 'fg' command to resume the installer and select 'Continue'.\n"
_errvolname="\nInvalid name entered.\n\nThe volume name may be alpha-numeric, but may not contain spaces, start with a '/', or already be in use.\n"
_lukserr="\nA minimum of two partitions are required for LUKS encryption:\n\n 1. root (/) - standard or LVM.\n 2. boot (/boot) - standard (unless LVM on BIOS system).\n"
_lvmerr="\nThere are no available partitions to use for LVM, a minimum of one is required.\n\nIf LVM is already in use, deactivating it will allow the partition(s) to be used again.\n"
_lvmerrlvsize="\nInvalid value Entered.\n\nMust be a numeric value with 'M' (megabytes) or 'G' (gigabytes) at the end.\n\ne.g. 400M, 10G, 250G, etc...\n\nThe value may also not be equal to or greater than the remaining size of the volume group.\n"

# }

###############################################################################
# selection menus
# main is the entry point which calls functions including outside of its block
# once those functions finished they always are returned here with the
# exception of install_main(), it exits upon completion

main()
{
	if [[ $NOMOUNT ]]; then
		(( SEL < 8 )) && (( SEL++ ))
		tput civis
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " Prepare " \
			--default-item $SEL --cancel-label 'Exit' --menu "$_prep" 0 0 0 \
			1 "* Select bootloader" \
			2 "* Username and password" \
			3 "* System configuration" \
			4 "Select WM(s) and/or DE(s)" \
			5 "Select additional packages" \
			6 "Enter a post-install command to run" \
			7 "View installation configuration" \
			8  "* Confirm choices and complete install" 2> "$ANS"

		read -r SEL < "$ANS"
		case $SEL in
			1) prechecks 0 && { select_bootldr  || (( SEL-- )); } ;;
			2) prechecks 1 && { select_mkuser   || (( SEL-- )); } ;;
			3) prechecks 2 && { select_config   || (( SEL-- )); } ;;
			4) prechecks 3 && { select_sessions || (( SEL-- )); } ;;
			5) prechecks 3 && { select_packages || (( SEL-- )); } ;;
			6) prechecks 3 && select_usercmd ;;
			7) prechecks 3 && select_show    ;;
			8) prechecks 3 && install_main   ;;
			*)  yesno "Exit" "\nUnmount partitions (if any) and exit the installer?\n" && die 0
		esac
	else
		(( SEL < 13 )) && (( SEL++ ))
		tput civis
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " Prepare " \
			--default-item $SEL --cancel-label 'Exit' --menu "$_prep" 0 0 0 \
			1 "Storage management" \
			2 "* Mount partitions" \
			3 "* Select bootloader" \
			4 "* Username and password" \
			5 "* System configuration" \
			6 "Select WM(s) and/or DE(s)" \
			7 "Select additional packages" \
			8 "Enter a post-install command to run" \
			9 "View installation configuration" \
			10 "* Confirm choices and complete install" 2> "$ANS"

		read -r SEL < "$ANS"
		if [[ -z $WARN && $SEL == 2 ]]; then
			msg "Data Warning" "$_warn"
			WARN=true
		fi
		case $SEL in
			1) dev_menu || (( SEL-- )) ;;
			2) mount_menu || (( SEL-- )) ;;
			3) prechecks 0 && { select_bootldr || (( SEL-- )); } ;;
			4) prechecks 1 && { select_mkuser || (( SEL-- )); } ;;
			5) prechecks 2 && { select_config || (( SEL-- )); } ;;
			6) prechecks 3 && { select_sessions || (( SEL-- )); } ;;
			7) prechecks 3 && { select_packages || (( SEL-- )); } ;;
			8) prechecks 3 && select_usercmd ;;
			9) prechecks 3 && select_show ;;
			10) prechecks 3 && install_main ;;
			*)  yesno "Exit" "\nUnmount partitions (if any) and exit the installer?\n" && die 0
		esac
	fi
}

select_show()
{
	local pkgs="${USER_PKGS[*]} ${SES_PKGS[*]}"
	[[ $INSTALL_WMS == *dwm* ]] && pkgs="dwm st dmenu $pkgs"
	pkgs="${pkgs//  / }" pkgs="${pkgs# }"
	msg "Show Configuration" "
---------- PARTITION CONFIGURATION ------------

  Root Part:      $ROOT - ${ROOTFS:-skipped}
  Boot Part:      ${BOOT:-none} - ${BOOTFS:-none}
  Boot Device:    ${BOOT_D:-none}
  Swap Part/File: ${SWAP:-none}
  Swap Size:      ${SWAP_S:-none}
  Extra Mounts:   ${EXMNTS:-none}
  Mkinit Hooks:   ${HOOKS:-none}

  LVM used:   ${LVM:-unused}
  LUKS used:  ${LUKS:-unused}

------------ SYSTEM CONFIGURATION -------------

  Locale:   ${LOCALE:-none}
  Keymap:   ${KEYMAP:-none}
  Hostname: ${NEWHOST:-none}
  Timezone: ${ZONE:-none}/${SUBZ:-none}

  Chroot cmd: ${USER_CMD:-none}

------------ USER CONFIGURATION ---------------

  Username:      ${NEWUSER:-none}
  Login Shell:   ${NEWSHELL:-none}
  Login Session: ${LOGIN_WM:-none}
  Autologin:     ${AUTOLOGIN:-none}
  Login Type:    ${LOGIN_TYPE:-none}

----------- PACKAGE CONFIGURATION -------------

  Kernel:     ${KERNEL:-none}
  Bootloader: ${BOOTLDR:-none}
  Packages:   ${pkgs:-none}
"
}

select_login()
{
	AUTOLOGIN=''

	dlg LOGIN_TYPE menu "Login" "\nSelect what kind of login management to use." \
		"xinit"   "Console login with no graphical display manager" \
		"lightdm" "Lightweight display manager (deepin and xfce default)" \
		"gdm"     "Gnome display manager (gnome default, go figure)" \
		"sddm"    "Simple desktop display manager (plasma and lxqt default)" || return 1

	case $LOGIN_TYPE in
		gdm|sddm)
			EDIT_FILES[login]="none"
			;;
		lightdm)
			LIGHTDM_GREETER='gtk-greeter'
			EDIT_FILES[login]="/etc/lightdm/lightdm.conf /etc/lightdm/lightdm-gtk-greeter.conf"
			local txt="\nWith a deepin install you can choose to use their greeter for lightdm\n\nUse the deepin greeter?\n"
			[[ $INSTALL_WMS == *deepin* ]] && yesno "Greeter" "$txt" && LIGHTDM_GREETER="deepin-greeter"
			;;
		xinit)
			EDIT_FILES[login]="/home/$NEWUSER/.xinitrc /home/$NEWUSER/.xprofile"
			if (( $(wc -w <<< "$INSTALL_WMS") > 1 )); then
				dlg LOGIN_WM menu "Session" "$_login" $LOGIN_CHOICES || return 1
				LOGIN_WM="${WM_SESSIONS[$LOGIN_WM]}"
			fi
			[[ -z $LOGIN_WM ]] && LOGIN_WM="${WM_SESSIONS[${INSTALL_WMS%% *}]}"
			yesno "Autologin" "$(sed "s|USER|$NEWUSER|g; s|RC|$LOGINRC|g" <<< "$_autologin")" && AUTOLOGIN=true
			;;
	esac
	return 0
}

select_config()
{
	typeset -i i=0
	CONFIG_DONE=''

	until [[ $CONFIG_DONE ]]; do
		case $i in
			0)
				dlg NEWSHELL menu "Shell" "\nChoose which shell to use." \
					zsh  'A very advanced and programmable command interpreter (shell) for UNIX' \
					bash 'The GNU Bourne Again shell, standard in many GNU/Linux distributions' \
					mksh 'The MirBSD Korn Shell - an enhanced version of the public domain ksh' || return 1

				;;
			1)
				dlg NEWHOST input "Hostname" "$_hostname" "${DIST,,}" limit || { i=0; continue; }
				;;
			2)
				dlg LOCALE menu "Locale" "$_locale" $LOCALES || { i=1; continue; }
				;;
			3)
				ZONE='' SUBZ=''
				until [[ $ZONE && $SUBZ ]]; do
					dlg ZONE menu "Timezone" "$_timez" \
						America - \
						Australia - \
						Asia - \
						Atlantic - \
						Africa - \
						Europe - \
						Indian - \
						Pacific - \
						Arctic - \
						Antarctica - || break

					dlg SUBZ menu "Timezone" "$_timesubz" $(awk '/'"$ZONE"'\// {
						gsub(/'"$ZONE"'\//, "")
						print $3 " - "
					}' /usr/share/zoneinfo/zone.tab | sort) || continue
				done
				[[ $ZONE && $SUBZ ]] || { i=2; continue; }
				;;
			4)
				dlg KERNEL menu "Kernel" "\nChoose which kernel to use." \
					linux          'Vanilla linux kernel and modules, with a few patches applied' \
					linux-lts      'Long-term support (LTS) linux kernel and modules' \
					linux-zen      'A effort of kernel hackers to provide the best kernel for everyday systems' \
					linux-hardened 'A security-focused linux kernel with hardening patches to mitigate exploits' || { i=3; continue; }

				CONFIG_DONE=true
				;;
		esac
		(( i++ )) # progress through to the next choice
	done

	case $NEWSHELL in
		bash) LOGINRC='.bash_profile' ;;
		zsh)  LOGINRC='.zprofile' ;;
		mksh) LOGINRC='.profile' ;;
	esac

	return 0
}

select_mkuser()
{
	NEWUSER=''
	typeset -a ans
	local rootsec="--- Root password, if left empty the user password will be used ---"

	until [[ $NEWUSER ]]; do
		tput cnorm
		dialog --insecure --backtitle "$DIST Installer - $SYS - v$VER" \
			--separator $'\n' --title " User " --mixedform "$_user" 0 0 0 \
			"Username:"  1 1 "${ans[0]}" 1 11 "$COLUMNS" 0 0 \
			"Password:"  2 1 ''          2 11 "$COLUMNS" 0 1 \
			"Password2:" 3 1 ''          3 12 "$COLUMNS" 0 1 \
			"$rootsec"   6 1 ''          6 68 "$COLUMNS" 0 2 \
			"Password:"  8 1 ''          8 11 "$COLUMNS" 0 1 \
			"Password2:" 9 1 ''          9 12 "$COLUMNS" 0 1 2> "$ANS" || return 1

		mapfile -t ans <"$ANS"

		# root passwords empty, so use the user passwords
		if [[ -z "${ans[4]}" && -z "${ans[5]}" ]]; then
			ans[4]="${ans[1]}"
			ans[5]="${ans[2]}"
		fi

		# make sure a username was entered and that the passwords match
		if [[ -z ${ans[0]} || ${ans[0]} =~ \ |\' || ${ans[0]} =~ [^a-z0-9] ]]; then
			msg "Invalid Username" "\nInvalid user name.\n\nPlease try again.\n"; ans[0]=''
		elif [[ -z "${ans[1]}" || "${ans[1]}" != "${ans[2]}" ]]; then
			msg "Password Mismatch" "\nThe user passwords do not match.\n\nPlease try again.\n"
		elif [[ "${ans[4]}" != "${ans[5]}" ]]; then
			msg "Password Mismatch" "\nThe root passwords do not match.\n\nPlease try again.\n"
		else
			NEWUSER="${ans[0]}"
			USER_PASS="${ans[1]}"
			ROOT_PASS="${ans[4]}"
		fi
	done
	return 0
}

select_keymap()
{
	if [[ ! -f /tmp/xkeys ]]; then
		dlg KEYMAP menu "Keyboard" "$_keymap" \
			af Afghani     al Albanian    am Armenian   ara Arabic    at German     au English \
			az Azerbaijani ba Bosnian     bd Bangla     be Belgian   'bg' Bulgarian br Portuguese \
			bt Dzongkha    bw Tswana      by Belarusian ca French    'cd' French    ch German \
			cm English     cn Chinese     cz Czech      de German     dk Danish     dz Berber \
			ee Estonian    epo Esperanto  es Spanish    et Amharic   'fi' Finnish   fo Faroese \
			fr French      gb English     ge Georgian   gh English    gn French     gr Greek \
			hr Croatian    hu Hungarian   id Indonesian ie Irish      il Hebrew    'in' Indian \
			iq Iraqi       ir Persian     is Icelandic  it Italian    jp Japanese   ke Swahili \
			kg Kyrgyz      kh Khmer       kr Korean     kz Kazakh     la Lao        latam Spanish \
			lk Sinhala     lt Lithuanian  lv Latvian    ma Arabic     mao Maori     md Moldavian \
			me Montenegrin mk Macedonian  ml Bambara    mm Burmese    mn Mongolian  mt Maltese \
			'mv' Dhivehi   my Malay       ng English    nl Dutch      no Norwegian  np Nepali \
			ph Filipino    pk Urdu        pl Polish     pt Portuguese ro Romanian   rs Serbian \
			ru Russian     se Swedish     si Slovenian  sk Slovak     sn Wolof      sy Arabic \
			tg French      th Thai        tj Tajik      tm Turkmen    tr Turkish    tw Taiwanese \
			tz Swahili     ua Ukrainian   us English    uz Uzbek      vn Vietnamese za English || return 1

		echo "$KEYMAP" > /tmp/xkeys
	else
		KEYMAP="$(< /tmp/xkeys)"
	fi

	if [[ ! -f /tmp/ckeys ]]; then
		if [[ $CMAPS == *"$KEYMAP "* ]]; then
			CMAP="$KEYMAP"
		else
			dlg CMAP menu "Console Keymap" "$_vconsole" $CMAPS || return 1
		fi
		echo "$CMAP" > /tmp/ckeys
	else
		CMAP="$(< /tmp/ckeys)"
	fi

	if [[ $TERM == 'linux' ]]; then
		loadkeys "$CMAP" > /dev/null 2>&1
	else
		setxkbmap "$KEYMAP" > /dev/null 2>&1
	fi

	return 0
}

select_usercmd()
{
	dlg USER_CMD input "Command" "$_usercmd" "$USER_CMD" nolimit
}

select_bootldr()
{
	if [[ $SYS == 'BIOS' ]]; then
		dlg BOOTLDR menu "BIOS Bootloader" "\nSelect which bootloader to use." \
			"grub"     "The Grand Unified Bootloader, standard among many Linux distributions" \
			"syslinux" "A collection of boot loaders for booting drives, CDs, or over the network" || return 1
	else
		dlg BOOTLDR menu "UEFI Bootloader" "\nSelect which bootloader to use." \
			"systemd-boot" "A simple UEFI boot manager which executes configured EFI images" \
			"grub"         "The Grand Unified Bootloader, standard among many Linux distributions" \
			"refind-efi"   "A UEFI boot manager that aims to be platform neutral and simplify multi-boot" \
			"efistub"      "Boot the kernel image directly (no chainloading support)" \
			"syslinux"     "A collection of boot loaders for booting drives, CDs, or over the network (no chainloading support)" || return 1
	fi
	setup_${BOOTLDR}
	return 0
}

select_sessions()
{
	typeset -a pkgs

	LOGIN_CHOICES=''
	dlg INSTALL_WMS check "Sessions" "$_sessions\n" \
		i3-gaps "A fork of i3wm with more features including gaps" "$(ofn i3-gaps "$INSTALL_WMS")" \
		openbox "A lightweight, powerful, and highly configurable stacking wm" "$(ofn openbox "$INSTALL_WMS")" \
		dwm "A dynamic WM for X that manages windows in tiled, floating, or monocle layouts" "$(ofn dwm "$INSTALL_WMS")" \
		bspwm "A tiling wm that represents windows as the leaves of a binary tree" "$(ofn bspwm "$INSTALL_WMS")" \
		lxqt "A port of the lightweight desktop environment (LXDE) to Qt" "$(ofn lxqt "$INSTALL_WMS")" \
		jwm "A lightweight window manager for Xorg written in C" "$(ofn jwm "$INSTALL_WMS")" \
		xfce4 "A lightweight and modular desktop environment based on gtk+2/3" "$(ofn xfce4 "$INSTALL_WMS")" \
		awesome "A customized Awesome WM session created by @elanapan" "$(ofn awesome "$INSTALL_WMS")" \
		fluxbox "A lightweight and highly-configurable window manager" "$(ofn fluxbox "$INSTALL_WMS")" \
		plasma "A KDE software project currently comprising a full desktop environment" "$(ofn plasma "$INSTALL_WMS")" \
		deepin "The desktop environment of the Chinese Deepin Linux distribution." "$(ofn deepin "$INSTALL_WMS")" \
		gnome "A desktop environment that aims to be simple and easy to use" "$(ofn gnome "$INSTALL_WMS")" \
		cinnamon "A desktop environment combining traditional desktop with modern effects" "$(ofn cinnamon "$INSTALL_WMS")"

	[[ $INSTALL_WMS ]] || return 0

	for i in ${INSTALL_WMS/dwm/}; do
		pkgs+=("$i")
	done

	for i in $INSTALL_WMS; do
		LOGIN_CHOICES+="$i - "
		if [[ $i =~ (plasma|deepin) ]]; then
			local pretxt="\nThere are some extra packages available for $i that you may want installed:"
			local txt="These are larger package groups containing applications that are a part of $i"
			txt+=" but are not included in the $i package group."
			yesno "${i^} Extra" "$pretxt ${WM_EXT[$i]}\n\n$txt\n\nWould you like to install them?\n" || continue
		fi
		if [[ ${WM_EXT[$i]} ]]; then
			for j in ${WM_EXT[$i]}; do
				pkgs+=("$j")
			done
		fi
	done

	select_login || return 1

	for pkg in "${pkgs[@]}"; do
		[[ ${SES_PKGS[*]} != *"$pkg"* ]] && SES_PKGS+=("$pkg")
	done

	if [[ $INSTALL_WMS ]]; then
		echo "$INSTALL_WMS" > /tmp/wmlist
	else
		rm -f /tmp/wmlist
	fi

	return 0
}

select_packages()
{
	dlg UPKGS check " Packages " "$_packages" \
		abiword "A Fully-featured word processor" "$(ofn abiword "${USER_PKGS[*]}")" \
		alacritty "A cross-platform, GPU-accelerated terminal emulator" "$(ofn alacritty "${USER_PKGS[*]}")" \
		atom "An open-source text editor developed by GitHub" "$(ofn atom "${USER_PKGS[*]}")" \
		audacious "A free and advanced audio player based on GTK+" "$(ofn audacious "${USER_PKGS[*]}")" \
		audacity "A program that lets you manipulate digital audio waveforms" "$(ofn audacity "${USER_PKGS[*]}")" \
		base-devel "A group of packages required for AUR" "$(ofn base-devel "${USER_PKGS[*]}")" \
		blueman "GUI bluetooth device manager" "$(ofn blueman "${USER_PKGS[*]}")" \
		bluez "Simple CLI based bluetooth support" "$(ofn bluez "${USER_PKGS[*]}")" \
		cairo-dock "Light eye-candy fully themable animated dock" "$(ofn cairo-dock "${USER_PKGS[*]}")" \
		calligra "A set of applications for productivity" "$(ofn calligra "${USER_PKGS[*]}")" \
		chromium "An open-source web browser based on the Blink rendering engine" "$(ofn chromium "${USER_PKGS[*]}")" \
		clementine "A modern music player and library organizer" "$(ofn clementine "${USER_PKGS[*]}")" \
		cmus "A small, fast and powerful console music player" "$(ofn cmus "${USER_PKGS[*]}")" \
		deadbeef "A GTK+ audio player for GNU/Linux" "$(ofn deadbeef "${USER_PKGS[*]}")" \
		deluge "A bittorrent client written in python" "$(ofn deluge "${USER_PKGS[*]}")" \
		elinks "An advanced and well-established feature-rich text mode web browser" "$(ofn elinks "${USER_PKGS[*]}")" \
		emacs "An extensible, customizable, self-documenting real-time display editor" "$(ofn emacs "${USER_PKGS[*]}")" \
		epiphany "A GNOME web browser based on the WebKit rendering engine" "$(ofn epiphany "${USER_PKGS[*]}")" \
		evince "A document viewer" "$(ofn evince "${USER_PKGS[*]}")" \
		evolution "Manage your email, contacts and schedule" "$(ofn evolution "${USER_PKGS[*]}")" \
		file-roller "Create and modify archives" "$(ofn file-roller "${USER_PKGS[*]}")" \
		firefox "A popular open-source web browser from Mozilla" "$(ofn firefox "${USER_PKGS[*]}")" \
		gcolor2 "A simple GTK+2 color selector" "$(ofn gcolor2 "${USER_PKGS[*]}")" \
		geany "A fast and lightweight IDE" "$(ofn geany "${USER_PKGS[*]}")" \
		geary "A lightweight email client for the GNOME desktop" "$(ofn geary "${USER_PKGS[*]}")" \
		gimp "GNU Image Manipulation Program" "$(ofn gimp "${USER_PKGS[*]}")" \
		git "The fast distributed version control system" "$(ofn git "${USER_PKGS[*]}")" \
		gnome-calculator "GNOME Scientific calculator" "$(ofn gnome-calculator "${USER_PKGS[*]}")" \
		gnome-disk-utility "Disk Management Utility" "$(ofn gnome-disk-utility "${USER_PKGS[*]}")" \
		gnome-system-monitor "View current processes and monitor system state" "$(ofn gnome-system-monitor "${USER_PKGS[*]}")" \
		gparted "A GUI frontend for creating and manipulating partition tables" "$(ofn gparted "${USER_PKGS[*]}")" \
		gpick "Advanced color picker using GTK+ toolkit" "$(ofn gpick "${USER_PKGS[*]}")" \
		gpicview "Lightweight image viewer" "$(ofn gpicview "${USER_PKGS[*]}")" \
		guvcview "Capture video from camera devices" "$(ofn guvcview "${USER_PKGS[*]}")" \
		hexchat "A popular and easy to use graphical IRC client" "$(ofn hexchat "${USER_PKGS[*]}")" \
		htop "An interactive process viewer" "$(ofn htop "${USER_PKGS[*]}")" \
		inkscape "Professional vector graphics editor" "$(ofn inkscape "${USER_PKGS[*]}")" \
		irssi "A modular text mode IRC client with Perl scripting" "$(ofn irssi "${USER_PKGS[*]}")" \
		kdenlive "A popular non-linear video editor for Linux" "$(ofn kdenlive "${USER_PKGS[*]}")" \
		krita "Edit and paint images" "$(ofn krita "${USER_PKGS[*]}")" \
		libreoffice-fresh "Full featured office suite" "$(ofn libreoffice-fresh "${USER_PKGS[*]}")" \
		lollypop "A new music playing application" "$(ofn lollypop "${USER_PKGS[*]}")" \
		mc "A file manager that imitates Norton Commander" "$(ofn mc "${USER_PKGS[*]}")" \
		mousepad "A simple text editor" "$(ofn mousepad "${USER_PKGS[*]}")" \
		mpd "A flexible, powerful, server-side application for playing music" "$(ofn mpd "${USER_PKGS[*]}")" \
		mpv "A media player based on mplayer" "$(ofn mpv "${USER_PKGS[*]}")" \
		mupdf "Lightweight PDF and XPS viewer" "$(ofn mupdf "${USER_PKGS[*]}")" \
		mutt "Small but very powerful text-based mail client" "$(ofn mutt "${USER_PKGS[*]}")" \
		nano "Pico editor clone with enhancements" "$(ofn nano "${USER_PKGS[*]}")" \
		nautilus "The default file manager for Gnome" "$(ofn nautilus "${USER_PKGS[*]}")" \
		ncmpcpp "A mpd client and almost exact clone of ncmpc with some new features" "$(ofn ncmpcpp "${USER_PKGS[*]}")" \
		neovim "A fork of Vim aiming to improve user experience, plugins, and GUIs." "$(ofn neovim "${USER_PKGS[*]}")" \
		nmap "Utility for network discovery and security auditing" "$(ofn nmap "${USER_PKGS[*]}")" \
		noto-fonts "Google Noto fonts" "$(ofn noto-fonts "${USER_PKGS[*]}")" \
		noto-fonts-cjk "Google Noto CJK fonts (Chinese, Japanese, Korean)" "$(ofn noto-fonts-cjk "${USER_PKGS[*]}")" \
		ntfs-3g "NTFS file system driver and utilities" "$(ofn ntfs-3g "${USER_PKGS[*]}")" \
		obs-studio "Free opensource streaming/recording software" "$(ofn obs-studio "${USER_PKGS[*]}")" \
		openshot "An open-source, non-linear video editor for Linux" "$(ofn openshot "${USER_PKGS[*]}")" \
		opera "A Fast and secure, free of charge web browser from Opera Software" "$(ofn opera "${USER_PKGS[*]}")" \
		pcmanfm "A fast and lightweight file manager based in Lxde" "$(ofn pcmanfm "${USER_PKGS[*]}")" \
		pidgin "Multi-protocol instant messaging client" "$(ofn pidgin "${USER_PKGS[*]}")" \
		plank "An elegant, simple, and clean dock" "$(ofn plank "${USER_PKGS[*]}")" \
		playerctl "Media player controller for spotify, vlc, audacious, bmp, xmms2, and others." "$(ofn playerctl "${USER_PKGS[*]}")" \
		qbittorrent "An advanced bittorrent client" "$(ofn qbittorrent "${USER_PKGS[*]}")" \
		qpdfview "A tabbed PDF viewer" "$(ofn qpdfview "${USER_PKGS[*]}")" \
		qt5ct "GUI for managing Qt based application themes, icons, and fonts" "$(ofn qt5ct "${USER_PKGS[*]}")" \
		qutebrowser "A keyboard-focused vim-like web browser based on Python and PyQt5" "$(ofn qutebrowser "${USER_PKGS[*]}")" \
		rhythmbox "A Music playback and management application" "$(ofn rhythmbox "${USER_PKGS[*]}")" \
		rsync "A file transfer program to keep remote files in sync" "$(ofn rsync "${USER_PKGS[*]}")" \
		rxvt-unicode "A unicode enabled rxvt-clone terminal emulator" "$(ofn rxvt-unicode "${USER_PKGS[*]}")" \
		sakura "A terminal emulator based on GTK and VTE" "$(ofn sakura "${USER_PKGS[*]}")" \
		simple-scan "Simple scanning utility" "$(ofn simple-scan "${USER_PKGS[*]}")" \
		simplescreenrecorder "A feature-rich screen recorder" "$(ofn simplescreenrecorder "${USER_PKGS[*]}")" \
		steam "A popular game distribution platform by Valve" "$(ofn steam "${USER_PKGS[*]}")" \
		surf "A simple web browser based on WebKit2/GTK+" "$(ofn surf "${USER_PKGS[*]}")" \
		terminator "Terminal emulator that supports tabs and grids" "$(ofn terminator "${USER_PKGS[*]}")" \
		termite "A minimal VTE-based terminal emulator" "$(ofn termite "${USER_PKGS[*]}")" \
		thunar "A modern file manager for the Xfce Desktop Environment" "$(ofn thunar "${USER_PKGS[*]}")" \
		thunderbird "Standalone mail and news reader from mozilla" "$(ofn thunderbird "${USER_PKGS[*]}")" \
		tilda "A GTK based drop down terminal for Linux and Unix" "$(ofn tilda "${USER_PKGS[*]}")" \
		tilix "A tiling terminal emulator for Linux using GTK+ 3" "$(ofn tilix "${USER_PKGS[*]}")" \
		transmission-cli "Free bittorrent client CLI" "$(ofn transmission-cli "${USER_PKGS[*]}")" \
		unrar "The RAR compression program" "$(ofn unrar "${USER_PKGS[*]}")" \
		transmission-gtk "GTK+ Front end for transmission" "$(ofn transmission-gtk "${USER_PKGS[*]}")" \
		transmission-qt "Qt Front end for transmission" "$(ofn transmission-qt "${USER_PKGS[*]}")" \
		ttf-anonymous-pro "A family fixed-width fonts designed with code in mind" "$(ofn ttf-anonymous-pro "${USER_PKGS[*]}")" \
		ttf-fira-code "Monospaced font with programming ligatures" "$(ofn ttf-fira-code "${USER_PKGS[*]}")" \
		ttf-font-awesome "Iconic font designed for Bootstrap" "$(ofn ttf-font-awesome "${USER_PKGS[*]}")" \
		ttf-hack "A hand groomed typeface based on Bitstream Vera Mono" "$(ofn ttf-hack "${USER_PKGS[*]}")" \
		vim "Vi Improved, a highly configurable, improved version of the vi text editor" "$(ofn vim "${USER_PKGS[*]}")" \
		vlc "A free and open source cross-platform multimedia player" "$(ofn vlc "${USER_PKGS[*]}")" \
		weechat "Fast, light and extensible IRC client" "$(ofn weechat "${USER_PKGS[*]}")" \
		wget "Network utility to retrieve files from the Web" "$(ofn wget "${USER_PKGS[*]}")" \
		xapps "Common library for X-Apps project" "$(ofn xapps "${USER_PKGS[*]}")" \
		xarchiver "A GTK+ frontend to various command line archivers" "$(ofn xarchiver "${USER_PKGS[*]}")" \
		xed "A small and lightweight text editor. X-Apps Project." "$(ofn xed "${USER_PKGS[*]}")" \
		xfce4-terminal "A terminal emulator based in the Xfce Desktop Environment" "$(ofn xfce4-terminal "${USER_PKGS[*]}")" \
		xreader "Document viewer for files like PDF and Postscript. X-Apps Project." "$(ofn xed "${USER_PKGS[*]}")" \
		zathura "Minimalistic document viewer" "$(ofn zathura "${USER_PKGS[*]}")"

	if [[ $UPKGS ]]; then    # add any needed PKG_EXT to the list
		for i in $UPKGS; do
			[[ ${USER_PKGS[*]} != *"$i"* ]] && USER_PKGS+=("$i")
			if [[ ${PKG_EXT[$i]} ]]; then
				for j in ${PKG_EXT[$i]}; do
					[[ ${USER_PKGS[*]} != *"$j"* ]] && USER_PKGS+=("$j")
				done
			fi
		done
	fi

	return 0
}

###############################################################################
# device management menus
# acts as an in-between function to avoid cluttering the main menu
# also called when mounting but not enough partitions are present

dev_menu()
{
	local txt="$1"
	local choice=''
	local back="Return to the main menu"
	[[ $txt ]] && back="Return to mounting"

	while :; do
		dlg choice menu "Device Management" \
			"\nHere you can perform some operations to modify system storage devices.\nSelect an option from the list below to see more.\n$txt" \
			'view' 'View the device tree output from lsblk' \
			'part' 'Modify the partition layout of a device' \
			'luks' 'Setup LUKS encryption on a partition or LVM' \
			'lvm'  'Setup logical volume management on partition(s)' \
			'back' "$back" || return 0

		if [[ $choice == 'back' ]]; then
			return 0
		elif [[ -z $WARN && $choice != 'view' ]]; then
			msg "Data Warning" "$_warn"
			WARN=true
		fi
		case "$choice" in
			'view') part_show ;;
			'part') part_menu && [[ "$AUTO_ROOT" ]] && return 0 ;;
			'luks') luks_menu ;;
			'lvm')  lvm_menu  ;;
		esac
	done
}

###############################################################################
# partitioning menu
# non-essential partitioning helpers called by the user when using the optional
# partition menu and selecting a device to edit

part_menu()
{
	local device choice devhash

	is_bg_install || return 0
	devhash="$(lsblk -f | base64)"
	umount_dir "$MNT"
	part_device || return 1
	device="$DEVICE"

	while :; do
		choice=""
		dlg choice menu 'Modify Partitions' "$_part\n\n$(lsblk -no NAME,MODEL,SIZE,FSTYPE,LABEL "$device")" \
			'auto'   'Whole device automatic partitioning' \
			'cfdisk' 'Curses based variant of fdisk' \
			'cgdisk' 'Curses based variant of gdisk' \
			'parted' 'GNU partition editor' $([[ "$DISPLAY" ]] && hash gparted >/dev/null 2>&1 && printf \
			'gparted -') \
			'fdisk'  'Dialog-driven creation and manipulation of partitions' \
			'gdisk'  'A text-mode partitioning tool that works on GUID Partition Table (GPT) disks' \
			'back'   'Return to the device management menu' || return 0

		if [[ -z $choice || $choice == 'back' ]]; then
			return 0
		elif [[ $choice == 'auto' ]]; then
			local root_size txt label boot_fs boot_type
			root_size=$(lsblk -lno SIZE "$device" | awk 'NR == 1 {
				if ($1 ~ "G") {
					sub(/G/, "")
					print ($1 * 1000 - 512) / 1000 "G"
				} else {
					sub(/M/, "")
					print ($1 - 512) "M"
				}}')
			txt="\nWARNING: ALL data on $device will be destroyed and the following partitions will be created\n\n- "
			if [[ $SYS == 'BIOS' ]]; then
				label="msdos" boot_fs="ext4" boot_type="primary"
				txt+="$boot_fs boot partition with the boot flag enabled (512M)\n- "
			else
				label="gpt" boot_fs="fat32" boot_type="ESP"
				txt+="$boot_fs efi boot partition (512M)\n- "
			fi
			txt+="ext4 partition using all remaining space ($root_size)\n\nDo you want to continue?\n"
			yesno "Auto Partition" "$txt" && part_auto "$device" "$label" "$boot_fs" "$root_size" "$boot_type"
		else
			clear
			tput cnorm
			$choice "$device"
		fi
		if [[ $devhash != "$(lsblk -f | base64)" ]]; then
			msg "Probing Partitions" "\nInforming kernel of partition changes using partprobe\n" 0
			partprobe > /dev/null 2>&1
			[[ $choice == 'auto' ]] && return
		fi
	done
}

part_show()
{
	msg "Device Tree" "\n\n$(
	lsblk -no NAME,MODEL,SIZE,TYPE,FSTYPE,MOUNTPOINT |
		awk '/disk|part|lvm|crypt/ && !'"/${IGNORE_DEV:-NONEXX}/"'{sub(/part|disk|crypt|lvm/, ""); print}'
	)\n\n"
}

part_auto()
{
	local device="$1" label="$2" boot_fs="$3" size="$4" boot_type="$5" dev_info=""

	msg "Auto Partition" "\nRemoving partitions on $device and setting label to $label\n" 1

	dev_info="$(parted -s "$device" print 2> /dev/null)"

	swapoff -a
	while read -r PART; do
		[[ $PART ]] || continue
		parted -s "$device" rm "$PART" > /dev/null 2> "$ERR"
		errshow 0 "parted -s '$device' rm '$PART' > /dev/null" || return 1
	done <<< "$(awk '/^ [1-9][0-9]?/ {print $1}' <<< "$dev_info" | sort -r)"

	[[ $(awk '/Table:/ {print $3}' <<< "$dev_info") != "$label" ]] && parted -s "$device" mklabel "$label" > /dev/null 2> "$ERR"

	msg "Auto Partition" "\nCreating a 512M $boot_fs boot partition.\n" 1
	parted -s "$device" mkpart "$boot_type" "$boot_fs" 1MiB 513MiB > /dev/null 2> "$ERR"
	errshow 0 "parted -s '$device' mkpart '$boot_type' '$boot_fs' 1MiB 513MiB > /dev/null" || return 1

	sleep 0.5
	BOOT_D="$device"
	AUTO_BOOT=$(lsblk -lno NAME,TYPE "$device" | awk 'NR==2 {print "/dev/" $1}')

	if [[ $SYS == "BIOS" ]]; then
		mkfs.ext4 -q "$AUTO_BOOT" > /dev/null 2> "$ERR"
		errshow 0 "mkfs.ext4 -q '$AUTO_BOOT' > /dev/null" || return 1
	else
		mkfs.vfat -F32 "$AUTO_BOOT" > /dev/null 2> "$ERR"
		errshow 0 "mkfs.vfat -F32 '$AUTO_BOOT' > /dev/null" || return 1
	fi

	msg "Auto Partition" "\nCreating a $size ext4 root partition.\n" 0
	parted -s "$device" mkpart primary ext4 513MiB 100% > /dev/null 2> "$ERR"
	errshow 0 "parted -s '$device' mkpart primary ext4 513MiB 100% > /dev/null" || return 1
	sleep 0.5
	AUTO_ROOT="$(lsblk -lno NAME,TYPE "$device" | awk 'NR==3 {print "/dev/" $1}')"
	mkfs.ext4 -q "$AUTO_ROOT" > /dev/null 2> "$ERR"
	errshow 0 "mkfs.ext4 -q '$AUTO_ROOT' > /dev/null" || return 1
	sleep 0.5
	msg "Auto Partition" "\nProcess complete.\n\n$(lsblk -o NAME,MODEL,SIZE,TYPE,FSTYPE "$device")\n"
}

###############################################################################
# partition management functions
# these are helpers used by other functions to do essential setup/teardown

part_find()
{
	local regexp="$1" err=''
	local s dev size isize model

	PARTS="$(part_pretty "" "$regexp")"
	PART_COUNT=$(wc -l <<< "$PARTS")

	case "$regexp" in
		'part|lvm|crypt')
			[[ $PART_COUNT -lt 1 || ($SYS == 'UEFI' && $PART_COUNT -lt 2) ]] && err="$_errpart"
			;;
		'part|crypt')
			(( PART_COUNT < 1 )) && err="$_lvmerr"
			;;
		'part|lvm')
			(( PART_COUNT < 2 )) && err="$_lukserr"
			;;
	esac

	if [[ $err ]]; then
		 msg "Not Enough Partitions" "$err" 0
		 return 1
	fi
	return 0
}

part_swap()
{
	local swp="$1"

	if [[ $swp == "$MNT/swapfile" && $SWAP_S ]]; then
		msg "Swap Setup" "\nActivating $SWAP_S swapfile at /swapfile\n" 1
		fallocate -l $SWAP_S "$swp" 2> "$ERR"
		errshow 0 "fallocate -l '$SWAP_S' '$swp'"
		chmod 600 "$swp" 2> "$ERR"
		errshow 0 "chmod 600 '$swp'"
	else
		msg "Swap Setup" "\nActivating swap partition $SWAP\n" 1
	fi
	mkswap "$swp" > /dev/null 2> "$ERR"
	errshow 0 "mkswap '$swp' > /dev/null"
	swapon "$swp" > /dev/null 2> "$ERR"
	errshow 0 "swapon '$swp' > /dev/null"
	return 0
}

part_mount()
{
	local part="$1"
	local mntp="${MNT}$2"
	local fs
	fs="$(lsblk -lno FSTYPE "$part")"

	mkdir -p "$mntp"

	# skipped formatting on existing btrfs partition?
	if [[ $fs == 'btrfs' && $BTRFS -eq 0 ]] && yesno "Btrfs Subvolume Mount" "\nDo you have a subvolume on $part that should be mounted at $mntp?\n"; then
		btrfs_name "\nEnter the name of initial subvolume on $part to be mounted at $mntp.\n\ne.g. mount -o subvol=YOUR_SUBVOL $part $mntp\n" || return 1
		btrfs_mount "$part" "$mntp" "$SUBVOL" || return 1
	else
		if [[ $BTRFS -ne 2 && $fs && ${FS_OPTS[$fs]} && $part != "$BOOT" && $part != "$AUTO_ROOT" ]] && select_mntopts "$part" "$fs"; then
			mount -o $MNT_OPTS "$part" "$mntp" > /dev/null 2> "$ERR"
			errshow 0 "mount -o $MNT_OPTS $part $mntp" || return 1
		else
			MNT_OPTS=''
			mount "$part" "$mntp" > /dev/null 2> "$ERR"
			errshow 0 "mount $part $mntp" || return 1
		fi
		msg "Mount Complete" "\nMounted $part at $mntp\n" 1
	fi

	part_countdec "$part"
	part_cryptlv "$part"
	return 0
}

part_pretty()
{
	local part="$1"
	local regexp="$2"
	local s dev size isize model

	# invalid block device passed in
	[[ $part && ! -b $part ]] && return

	# full search when not given a regex
	[[ $regexp == "" ]] && regexp="part|crypt|lvm"

	# string of partitions >= 80M
	# format: /dev/sda1 447.1G__ext4__unlabeled__Sandisk_SDSSDXP480G
	while read -r dev size; do
		[[ $dev && $size ]] || continue
		s=${size%%__*}
		size_t="${s: -1:1}"
		isize=${s:0: -1}
		isize=${isize%.*}
		if [[ $dev = /dev/nvme* ]]; then
			model=$(lsblk -lno MODEL "${dev%p[1-9]}" | awk '{gsub(/ |\t/, "_"); print}')
		else
			model=$(lsblk -lno MODEL "${dev%[1-9]}" | awk '{gsub(/ |\t/, "_"); print}')
		fi
		[[ $size_t == 'K' || ($size_t == 'M' && $isize -lt 80) ]] || printf "%s\n" "$dev ${size}__$model"
	done < <(lsblk -lno TYPE,PATH,SIZE,FSTYPE,LABEL $part |
		awk "/$regexp/"' && !'"/${IGNORE_DEV:-NONEXX}/"' {
			if ($4 == "") {
				$4 = "unformatted"
			}
			if ($5 == "") {
				$5 = "unlabeled"
			}
			print $2, $3 "__" $4 "__" $5
		}')
}

part_format()
{
	local part="$1"
	local fs="$2"
	local delay="$3"

	msg "File System Format" "\nFormatting $part as $fs\n" 0

	if [[ $fs == 'f2fs' && -z $PF2FS ]]; then
		modprobe f2fs
		PF2FS=true
		sleep 1
	elif [[ $fs == 'btrfs' && -z $PBTRFS ]]; then
		modprobe btrfs
		PBTRFS=true
		sleep 1
	fi

	mkfs.$fs ${FS_CMD_FLAGS[$fs]} "$part" > /dev/null 2> "$ERR" || mkfs.$fs ${FS_CMD_FLAGS[$fs]} "$part" > /dev/null 2> "$ERR"
	errshow 0 "mkfs.$fs ${FS_CMD_FLAGS[$fs]} $part" || return 1
	sleep "$delay"
}

part_device()
{
	if [[ $DEV_COUNT -eq 1 && $DEVS ]]; then
		DEVICE="$(awk '{print $1}' <<< "$DEVS")"
	elif (( DEV_COUNT > 1 )); then
		if [[ $1 ]]; then
			dlg DEVICE menu "Boot Device" "\nSelect the device to use for bootloader install." $DEVS
		else
			dlg DEVICE menu "Select Device" "$_device" $DEVS
		fi
		[[ $DEVICE ]] || return 1
	elif [[ $DEV_COUNT -lt 1 && ! $1 ]]; then
		msg "Device Error" "\nNo available devices.\n\nExiting..\n" 2
		die 1
	fi

	[[ $1 ]] && BOOT_D="$DEVICE"

	return 0
}

part_bootdev()
{
	BOOT_D="${BOOT%[1-9]}"
	BOOT_NUM="${BOOT: -1}"
	[[ $BOOT = /dev/nvme* ]] && BOOT_D="${BOOT%p[1-9]}"
	if [[ $SYS == 'UEFI' ]]; then
		parted -s $BOOT_D set $BOOT_NUM esp on > /dev/null 2>&1
	else
		parted -s $BOOT_D set $BOOT_NUM boot on > /dev/null 2>&1
	fi
	return 0
}

part_cryptlv()
{
	local part="$1" devs=""
	devs="$(lsblk -lno NAME,FSTYPE,TYPE)"

	# Identify if $part is LUKS+LVM, LVM+LUKS, LVM alone, or LUKS alone
	if lsblk -lno TYPE "$part" | grep -q 'crypt'; then
		LUKS='encrypted'
		LUKS_NAME="${part#/dev/mapper/}"
		for dev in $(awk '/lvm/ && /crypto_LUKS/ {print "/dev/mapper/"$1}' <<< "$devs" | sort | uniq); do
			if lsblk -lno NAME "$dev" | grep -q "$LUKS_NAME"; then
				LUKS_DEV="${LUKS_DEV}cryptdevice=$dev:$LUKS_NAME "
				LVM='logical volume'
				break
			fi
		done
		for dev in $(awk '/part/ && /crypto_LUKS/ {print "/dev/"$1}' <<< "$devs" | sort | uniq); do
			if lsblk -lno NAME "$dev" | grep -q "$LUKS_NAME"; then
				LUKS_UUID="$(lsblk -lno UUID,TYPE,FSTYPE "$dev" | awk '/part/ && /crypto_LUKS/ {print $1}')"
				LUKS_DEV="${LUKS_DEV}cryptdevice=UUID=$LUKS_UUID:$LUKS_NAME "
				break
			fi
		done
	elif lsblk -lno TYPE "$part" | grep -q 'lvm'; then
		LVM='logical volume'
		VNAME="${part#/dev/mapper/}"
		for dev in $(awk '/crypt/ && /lvm2_member/ {print "/dev/mapper/"$1}' <<< "$devs" | sort | uniq); do
			if lsblk -lno NAME "$dev" | grep -q "$VNAME"; then
				LUKS_NAME="${dev/\/dev\/mapper\//}"
				break
			fi
		done
		for dev in $(awk '/part/ && /crypto_LUKS/ {print "/dev/"$1}' <<< "$devs" | sort | uniq); do
			if lsblk -lno NAME "$dev" | grep -q "$LUKS_NAME"; then
				LUKS_UUID="$(lsblk -lno UUID,TYPE,FSTYPE "$dev" | awk '/part/ && /crypto_LUKS/ {print $1}')"
				LUKS_DEV="${LUKS_DEV}cryptdevice=UUID=$LUKS_UUID:$LUKS_NAME "
				LUKS='encrypted'
				break
			fi
		done
	fi
}

part_countdec()
{
	for pt; do
		if (( PART_COUNT )); then
			PARTS="$(sed "/${pt//\//\\/}/d" <<< "$PARTS")"
			(( PART_COUNT-- ))
		fi
	done
}

###############################################################################
# mounting menus
# mount_menu is the entry point which calls all other functions
# once finished it returns to the main menu: main()

mount_menu()
{
	is_bg_install || return 0
	msg "Mount Menu" "\nGathering device and partition information.\n" 1
	lvm_detect
	umount_dir "$MNT"
	if ! part_find 'part|lvm|crypt'; then
		dev_menu "$_errpart"
		if ! part_find 'part|lvm|crypt'; then
			SEL=0
			return 1
		fi
	fi
	[[ $LUKS && $LUKS_PART ]] && part_countdec $LUKS_PART
	[[ $LVM && $LVM_PARTS ]] && part_countdec $LVM_PARTS
	select_root || { ROOT=''; return 1; }
	select_boot || { BOOT=''; return 1; }
	if [[ $BOOT ]]; then
		part_mount "$BOOT" "/boot" || return 1
		part_bootdev
		SEP_BOOT=true
	fi
	select_swap || return 1
	select_extra || return 1
	install_background
	return 0
}

select_boot()
{
	local s pts dev size isize ptcount=0

	if [[ -z $BOOT ]]; then
		if [[ $AUTO_BOOT && -z $LVM && -z $LUKS ]]; then
			BOOT="$AUTO_BOOT"
			return 0
		fi

		if (( PART_COUNT )); then
			while read -r dev size; do  # walk partition list and skip ones that are too small/big for boot
				s=${size%%__*}
				size_t="${s: -1:1}"
				isize=${s:0:-1}
				isize=${isize%.*}
				if ! [[ $size_t == 'T' || ($size_t == 'G' && $isize -gt 2) ]]; then
					pts+="$dev $size "
					(( ptcount++ ))
				fi
			done <<< "$PARTS"
		fi

		local txt="\nNo partitions available that meet size requirements!!\n\nReturning to the main menu.\n"

		case "$SYS" in
			UEFI)
				case "$ptcount" in
					0)
						msg "EFI Boot Partition" "$txt" 2
						return 1
						;;
					1)
						msg "EFI Boot Partition" "\nOnly one partition that meets size requirements for boot (/boot).\n" 1
						BOOT="$(awk 'NF > 0 {print $1}' <<< "$pts")"
						;;
					*)
						dlg BOOT menu "EFI Partition" "$_uefi" $pts
						;;
				esac
				[[ $BOOT ]] || return 1
				;;
			BIOS)
				if [[ $LUKS && ! $LVM ]]; then
					case "$ptcount" in
						0)
							txt="\nLUKS without LVM requires a separate boot partition.$txt"
							msg "Boot Partition" "$txt" 2
							return 1
							;;
						1)
							msg "Boot Partition" "\nOnly one partition that meets size requirements for boot (/boot).\n" 1
							BOOT="$(awk 'NF > 0 {print $1}' <<< "$pts")"
							;;
						*)
							dlg BOOT menu "Boot Partition" "$_biosluks" $pts
							;;
					esac
					[[ $BOOT ]] || return 1
				else
					(( ! ptcount )) && return 0
					dlg BOOT menu "Boot Partition" "$_bios" "skip" "no separate boot" $pts
					if [[ -z $BOOT || $BOOT == "skip" ]]; then
						BOOT=''
						return 0
					fi
				fi
				;;
		esac
	fi

	local fs
	fs="$(fsck -N "$BOOT")"
	BOOTFS="$fs"
	if ([[ $SYS == 'BIOS' ]] && grep -q 'ext[34]' <<< "$fs") || ([[ $SYS == 'UEFI' ]] && grep -q 'fat' <<< "$fs"); then
		yesno "Format Boot Partition" "\nIMPORTANT: $BOOT $_format" "Format" "Do Not Format" 1 || return 0
	fi

	case "$SYS" in
		UEFI)
			BOOTFS='vfat'
			part_format "$BOOT" "vfat" 2 || return 1
			;;
		BIOS)
			BOOTFS='ext4'
			part_format "$BOOT" "ext4" 2 || return 1
			;;
	esac
	return 0
}

select_root()
{
	local pts dev size isize ptcount=0

	if [[ -z $ROOT ]]; then
		if [[ $AUTO_ROOT && -z $LVM && -z $LUKS ]]; then
			ROOT="$AUTO_ROOT"
			msg "Mount Menu" "\nUsing partitions created during automatic format.\n" 2
			part_mount "$ROOT" || { AUTO_ROOT='' ROOT=''; return 1; }
			return 0  # we're done here
		else # walk partition list and skip ones that are < 8G
			while read -r dev size; do
				s=${size%%__*}
				size_t="${s: -1:1}"
				isize=${s:0: -1}
				isize=${isize%.*}
				if ! [[ $size_t == 'M' || ($size_t == 'G' && $isize -lt 8) ]]; then
					pts+="$dev $size "
					(( ptcount++ ))
				fi
			done <<< "$PARTS"

			if (( ptcount == 1 )); then  # only one available device
				msg "Root Partition (/)" "\nOnly one that meets size requirements for root (/).\n" 2
				ROOT="$(awk 'NF > 0 {print $1}' <<< "$pts")"
			else
				local txt="\nSelect the root (/) partition, this is where $DIST will be installed."
				txt+="\n\nDevices smaller than 8G will not be shown here."
				dlg ROOT menu "Mount Root" "$txt" $pts
			fi
		fi
	fi

	if [[ $ROOT ]]; then
		select_filesystem "$ROOT" || return 1
		part_mount "$ROOT" || return 1
		if (( BTRFS == 2 )); then
			btrfs_subvols "$ROOT" || return 1
		fi
		BTRFS=0
		return 0
	fi

	# should never reach here unless an error occurred
	ROOT=''
	return 1
}

select_swap()
{
	local pts dev size isize

	if (( PART_COUNT )) ; then
		while read -r dev size; do  # walk partition list and skip ones that are > 64G
			s=${size%%__*}
			size_t="${s: -1:1}"
			isize=${s:0: -1}
			isize=${isize%.*}
			if ! [[ $size_t == 'T' || ($size_t == 'G' && $isize -gt 64) ]]; then
				pts+="$dev $size "
			fi
		done <<< "$PARTS"
	fi

	dlg SWAP menu "Swap Setup" "\nSelect whether to use a swapfile, swap partition, or none." \
		"none" "No swap space" \
		"swapfile" "/swapfile (editable size)" \
		$pts

	if [[ -z $SWAP || $SWAP == "none" ]]; then
		SWAP=''
		return 0
	elif [[ $SWAP == "swapfile" ]]; then
		local i=0
		until [[ ${SWAP_S:0:1} =~ [1-9] && ${SWAP_S: -1} =~ (M|G) ]]; do
			if (( i > 0 )); then
				msg "Swap Size Error" \
					"\nSwap size must be 1(M|G) or greater, and can only contain whole numbers\n\nSize entered: $SWAP_S\n" 2
			fi
			if ! dlg SWAP_S input "Swap Setup" "$_swapsize" "$SYS_MEM"; then
				SWAP=''
				SWAP_S=''
				return 1
			fi
			(( i++ ))
		done
		part_swap "$MNT/$SWAP"
		SWAP="/$SWAP"
	else
		part_swap "$SWAP"
		part_countdec "$SWAP"
		SWAP_S="$(lsblk -lno SIZE $SWAP)"
	fi
	return 0
}

select_extra()
{
	local part dev size

	# walk partition list and skip ones that are < 1G
	if (( PART_COUNT )); then
		while read -r dev size; do
			s=${size%%__*}
			[[ ${s: -1:1} == 'M' ]] && part_countdec "$dev"
		done <<< "$PARTS"
	fi

	if (( ! PART_COUNT )); then
		msg "Mount Extra" "\nMounting Finished\n\nNo more partitions to mount, returning to main menu.\n" 2
	else
		while (( PART_COUNT )); do
			part=''
			dlg part menu 'Mount Extra' "$_expart" 'done' 'finish mounting step' $PARTS || break
			if [[ $part == 'done' ]]; then
				break
			elif select_filesystem "$part" && select_mountpoint && part_mount "$part" "$EXMNT"; then
				if (( BTRFS == 2 )); then
					btrfs_subvols "$part" "$EXMNT" || return 1
				fi
				EXMNTS+="$part: $EXMNT "
				[[ $EXMNT == '/usr' && $HOOKS != *usr* ]] && HOOKS+=" usr"
				BTRFS=0
			else
				return 1
			fi
		done
	fi
	return 0
}

select_mntopts()
{
	local part="$1"
	local fs="$2"
	local opts=''
	local title="${fs^} Mount Options"

	yesno "$title" "\nMount $part with default mount options?\n" && return 1
	for i in ${FS_OPTS[$fs]}; do
		opts+="$i - off "
	done
	until [[ $MNT_OPTS ]]; do
		dlg MNT_OPTS check "$title" "$_mount" $opts || return 1 # no options is auto mount
		MNT_OPTS="${MNT_OPTS// /,}"
		yesno "$title" "\nConfirm mount options: $MNT_OPTS\n" || MNT_OPTS=''
	done
	return 0
}

select_filesystem()
{
	local part="$1"
	local fs=''
	local cur txt pt
	cur="$(lsblk -lno FSTYPE "$part" 2> /dev/null)"
	txt="\nSelect which file system to use for $(part_pretty "$part")\n\ndefault:  ext4"

	if [[ $cur ]]; then
		txt+="\nexisting:  $cur"
		# bail early if the partition was created in part_auto()
		[[ $part == "$AUTO_ROOT" ]] && return 0
	fi

	BTRFS=0
	until [[ $fs ]]; do
		dlg fs menu "File System" "$txt" $([[ $cur ]] && printf "skip -") \
			ext4 "The evolution of the most used Linux file system, successor to Ext3" \
			ext3 "Third extended file system, successor to Ext2" \
			ext2 "Second extended file system, unlike 3/4 it is not journaled and obsolete" \
			vfat "File allocation table, a legacy file system which is simple and robust" \
			btrfs "A modern copy on write file system with advanced features, fault tolerance, repair, and easy administration" \
			ntfs "NT file system, a journaling file system created by Microsoft" \
			f2fs "Flash-friendly file system, intended for NAND-based flash memory" \
			jfs "Journaled file system created by IBM and open-sourced in 1999" \
			xfs "Journaled file system created by Silicon Graphics Inc. (SGI)" \
			nilfs2 "A log-structured file system implementation for the Linux kernel" \
			reiserfs "Journaled file system created by a team at Namesys led by Hans Reiser" || return 1

		[[ $fs == 'skip' ]] && return 0
		yesno "File System" "\nFormat $part as $fs?\n" || fs=''
	done

	[[ $part == "$ROOT" ]] && ROOTFS=$fs
	part_format "$part" "$fs" 1

	if [[ $fs == 'btrfs' ]]; then
		BTRFS=1
		yesno "Btrfs Subvolumes" "$_btrfs" && BTRFS=2
	fi
}

select_mountpoint()
{
	EXMNT=''
	until [[ $EXMNT ]]; do
		dlg EXMNT input "Extra Mount $(part_pretty "$part")" "$_exmnt" "/" || return 1
		if [[ ${EXMNT:0:1} != "/" || ${#EXMNT} -le 1 || $EXMNT =~ \ |\' || $EXMNTS == *"$EXMNT"* ]]; then
			msg "Mountpoint Error" "$_errexpart"
			EXMNT=''
		fi
	done
	return 0
}

###############################################################################
# installation
# main is the entry point which calls all other install functions, once
# complete it shows a dialog to edit files on the new system before reboot

install_main()
{
	install_base
	genfstab -U "$MNT" > "$MNT/etc/fstab" 2> "$ERR"
	errshow 1 "genfstab -U '$MNT' > '$MNT/etc/fstab'"
	[[ -f $MNT/swapfile ]] && sed -i "s~${MNT}~~" "$MNT/etc/fstab"
	install_packages
	install_tearfree "$MNT/etc/X11/xorg.conf.d"
	install_mkinitcpio
	install_bootldr
	chrun "hwclock --systohc --utc" || chrun "hwclock --systohc --utc --directisa"
	install_user
	install_login

	# changing distro name?
	if grep -q 'ArchLabs' "$MNT/etc/lsb-release" && [[ $DIST != 'ArchLabs' ]]; then
		sed -i "s/ArchLabs/$DIST/g" "$MNT/etc/lsb-release"
		sed -i "s/ArchLabs/$DIST/g" "$MNT/etc/os-release"
	else
		sed -i "s/Arch/$DIST/g" "$MNT/etc/lsb-release"
		sed -i "s/Arch/$DIST/g" "$MNT/etc/os-release"
	fi

	# allow members of the wheel group to run commands as root
	sed -i "s/# %wheel ALL=(ALL) ALL/%wheel ALL=(ALL) ALL/g" "$MNT/etc/sudoers"

	chrun "chown -Rf $NEWUSER:users /home/$NEWUSER"

	if [[ "$USER_CMD" ]]; then
		chrun "$USER_CMD" 2> "$ERR" 2>&1
		errshow 0 "chrun '$USER_CMD'"
	fi

	while :; do
		dlg choice menu "Finalization" "$_edit" \
			finished   "exit the installer and reboot" \
			keyboard   "${EDIT_FILES[keyboard]}" \
			console    "${EDIT_FILES[console]}" \
			locale     "${EDIT_FILES[locale]}" \
			hostname   "${EDIT_FILES[hostname]}" \
			sudoers    "${EDIT_FILES[sudoers]}" \
			mkinitcpio "${EDIT_FILES[mkinitcpio]}" \
			fstab      "${EDIT_FILES[fstab]}" \
			crypttab   "${EDIT_FILES[crypttab]}" \
			bootloader "${EDIT_FILES[bootloader]}" \
			pacman     "${EDIT_FILES[pacman]}" \
			login      "${EDIT_FILES[login]}"

		if [[ -z $choice || $choice == 'finished' ]]; then
			[[ $DEBUG == true && -r $DBG ]] && ${EDITOR:-vim} "$DBG"
			clear
			die 127
		else
			for f in ${EDIT_FILES[$choice]}; do
				if [[ -e ${MNT}$f ]]; then
					${EDITOR:-vim} "${MNT}$f"
				else
					msg "File Missing" "\nOne or more of the files selected do not exist:\n\n${MNT}$f\n"
				fi
			done
		fi
	done
}

install_base()
{
	clear
	tput cnorm
	if [[ $BG_PID ]] && kill -0 $BG_PID 2> /dev/null; then
		[[ -e /tmp/wmlist ]] && rm /tmp/wmlist
		printf "\nA background install process is still running, tailing the output...\n"
		tail -f --pid=$BG_PID "$BG"
		trap - EXIT
		unset BG_PID
	fi

	mkdir -pv "$MNT/etc/default"
	mkdir -pv "$MNT/etc/X11/xorg.conf.d/"

	if (( ! PACSTRAP )); then
		# remove archiso files when copying iso
		rm -rf "$MNT/etc/mkinitcpio-archiso.conf"
		find "$MNT/usr/lib/initcpio" -name 'archiso*' -type f -delete

		# vmlinuz, if this isn't copied the vanilla kernel may fail mkinitcpio
		cp -vf "$RUN/x86_64/vmlinuz" "$MNT/boot/vmlinuz-linux" 2> "$ERR"
		errshow 1 "cp -vf '$RUN/x86_64/vmlinuz' '$MNT/boot/vmlinuz-linux'"

		# remove/disable customizations done to airootfs during building
		chrun "systemctl disable pacman-init.service choose-mirror.service" > /dev/null 2>&1
		rm -f "$MNT/etc/systemd/scripts/choose-mirror"
		rm -f "$MNT/etc/systemd/system/"{choose-mirror.service,etc-pacman.d-gnupg.mount,pacman-init.service}
		sed -i 's/#\(Storage=\)volatile/\1auto/' "$MNT/etc/systemd/journald.conf"
		sed -i 's/\(HandleLidSwitch=\)ignore/#\1suspend/' "$MNT/etc/systemd/logind.conf"
		sed -i 's/\(HandleSuspendKey=\)ignore/#\1suspend/' "$MNT/etc/systemd/logind.conf"
		sed -i 's/\(HandleHibernateKey=\)ignore/#\1hibernate/' "$MNT/etc/systemd/logind.conf"
		find "$MNT/boot" -name '*-ucode.img' -delete
	elif [[ $DIST == "ArchLabs" ]]; then
		# we have some customizations in /etc on the iso we want to preserve
		cp -vf /etc/modprobe.d/* "$MNT/etc/modprobe.d/"  # */
		cp -vf /etc/X11/xorg.conf.d/* "$MNT/etc/X11/xorg.conf.d/"  # */
		cp -vf /etc/dialogrc "$MNT/etc/dialogrc"
		cp -vf /etc/os-release "$MNT/etc/os-release"
		cp -vf /etc/lsb-release "$MNT/etc/lsb-release"
		cp -vf /etc/skel/.zshrc "$MNT/etc/skel/.zshrc"
	fi

	# copy network settings
	[[ -f /etc/resolv.conf ]] && cp -fv /etc/resolv.conf "$MNT/etc/"
	[[ -d /etc/netctl/interfaces ]] && cp -rfv /etc/netctl/interfaces "$MNT/etc/netctl/"
	[[ -d /etc/NetworkManager/system-connections ]] && cp -rvf /etc/NetworkManager/system-connections "$MNT/etc/NetworkManager/"

	# stop pacman complaining
	chrun 'mkdir -p /var/lib/pacman/sync'
	chrun 'touch /var/lib/pacman/sync/{core.db,extra.db,community.db}'

	echo "LANG=$LOCALE" > "$MNT/etc/locale.conf"
	cp -fv "$MNT/etc/locale.conf" "$MNT/etc/default/locale"
	sed -i "s/#en_US.UTF-8/en_US.UTF-8/g; s/#${LOCALE}/${LOCALE}/g" "$MNT/etc/locale.gen"
	chrun "locale-gen"
	chrun "ln -svf /usr/share/zoneinfo/$ZONE/$SUBZ /etc/localtime"

	cat > "$MNT/etc/X11/xorg.conf.d/00-keyboard.conf" <<- EOF
	# Use localectl(1) to instruct systemd-localed to update it.
	Section "InputClass"
	    Identifier      "system-keyboard"
	    MatchIsKeyboard "on"
	    Option          "XkbLayout" "$KEYMAP"
	EndSection
	EOF

	cat > "$MNT/etc/default/keyboard" <<- EOF
	# KEYBOARD CONFIGURATION FILE
	# Consult the keyboard(5) manual page.
	XKBMODEL=""
	XKBLAYOUT="$KEYMAP"
	XKBVARIANT=""
	XKBOPTIONS=""
	BACKSPACE="guess"
	EOF
	printf "KEYMAP=%s\nFONT=%s\n" "$CMAP" "$FONT" > "$MNT/etc/vconsole.conf"

	echo "$NEWHOST" > "$MNT/etc/hostname"
	cat > "$MNT/etc/hosts" <<- EOF
	127.0.0.1	localhost
	127.0.1.1	$NEWHOST
	::1			localhost ip6-localhost ip6-loopback
	ff02::1		ip6-allnodes
	ff02::2		ip6-allrouters
	EOF
}

install_user()
{
	local i=0
	local groups='audio,video,floppy,log,network,rfkill,scanner,storage,optical,power,wheel'
	[[ -e $MNT/etc/X11/xorg.conf.d/20-nvida.conf && -e $MNT/usr/bin/optirun ]] && groups+=',bumblebee'

	rm -f "$MNT/root/.zlogin"  # remove welcome message

	chrun "chpasswd <<< 'root:$ROOT_PASS'" 2> "$ERR" 2>&1
	errshow 1 "chrun 'chpasswd <<< \"root:$ROOT_PASS\"'"
	if [[ $NEWSHELL != 'zsh' ]]; then # root uses zsh by default
		chrun "usermod -s /bin/$NEWSHELL root" 2> "$ERR" 2>&1
		errshow 1 "chrun 'usermod -s /bin/$NEWSHELL root'"
		# copy the default mkshrc to /root if it was selected
		[[ $NEWSHELL == 'mksh' ]] && cp -fv "$MNT/etc/skel/.mkshrc" "$MNT/root/.mkshrc"
	fi

	echo "Creating new user $NEWUSER and setting password"

	# check if there's an existing user home for new user (separate /home)
	[[ -d "$MNT/home/$NEWUSER" ]] && i=1

	chrun "useradd -m -u 1000 -g users -G $groups -s /bin/$NEWSHELL $NEWUSER" 2> "$ERR" 2>&1
	errshow 1 "chrun 'useradd -m -u 1000 -g users -G $groups -s /bin/$NEWSHELL $NEWUSER'"
	chrun "chpasswd <<< '$NEWUSER:$USER_PASS'" 2> "$ERR" 2>&1
	errshow 1 "chrun 'chpasswd <<< \"$NEWUSER:$USER_PASS\"'"

	[[ $INSTALL_WMS == *dwm* ]] && install_suckless "/home/$NEWUSER" chroot

	# upgrade existing home with new skeleton configs
	[[ $i == 1 ]] && cp -aT "$MNT/etc/skel/" "$MNT/home/$NEWUSER"

	install_cleanup "$NEWUSER"

	return 0
}

install_login()
{
	AUTOLOGIN_SERV="$MNT/etc/systemd/system/getty@tty1.service.d"

	if [[ -z $LOGIN_TYPE ]]; then
		rm -rf "$AUTOLOGIN_SERV"
		return 0
	fi

	echo "Setting up $LOGIN_TYPE"

	if [[ $LOGIN_TYPE != 'xinit' ]]; then
		[[ $INSTALL_WMS == *dwm* ]] && dwm_xsession
		rm -rf "$AUTOLOGIN_SERV" "$MNT/home/$NEWUSER/.xinitrc"
		chrun "systemctl enable $LOGIN_TYPE.service" 2> "$ERR"
		errshow 1 "chrun 'systemctl enable $LOGIN_TYPE.service'"
	fi

	config_${LOGIN_TYPE}
}

install_cleanup()
{
	local user="$1"

	# remove tint2 configs if bspwm and openbox aren't being installed
	[[ $INSTALL_WMS =~ (bspwm|openbox) ]] || rm -rf "$MNT/home/$user/.config/tint2"

	# remove jgmenu configs if bspwm, fluxbox, and openbox aren't being installed
	[[ $INSTALL_WMS =~ (fluxbox|bspwm|openbox) ]] || rm -rf "$MNT/home/$user/.config/jgmenu"

	# remove geany configs if it wasn't installed
	[[ ${USER_PKGS[*]} != *geany* ]] && rm -rf "$MNT/home/$user/.config/geany"

	# remove shell stuff for unused shells
	[[ $NEWSHELL != 'bash' ]] && rm -rf "$MNT/home/$user/.bash"*
	[[ $NEWSHELL != 'zsh' ]] && rm -rf "$MNT/home/$user/.z"*

	# cleanup default jwmrc
	if [[ $INSTALL_WMS == *jwm* ]]; then
		sed '7,14d; s/xlock -mode blank/i3-lock-fancy -p/g; s/root:1/rofi_run/g' "$MNT/etc/system.jwmrc" > "$MNT/home/$user/.jwmrc"
	fi

	# no picom (compton) or ksuperkey in dwm login
	[[ $LOGIN_WM == 'dwm' ]] && sed -i '/super/d; /picom/d' "$MNT/home/$user/.xprofile" "$MNT/root/.xprofile"

	# remove some commands from ~/.xprofile when using self contained sessions
	if [[ $LOGIN_WM =~ ($SELF_CONTAINED_SES) || ($LOGIN_TYPE != 'xinit' && $INSTALL_WMS =~ ($SELF_CONTAINED)) ]]; then
		sed -i '/super/d; /nitrogen/d; /picom/d' "$MNT/home/$user/.xprofile" "$MNT/root/.xprofile"
	fi

}

install_bootldr()
{
	local uuid_type="UUID"

	echo "Installing $BOOTLDR"

	if [[ $ROOT == /dev/mapper* ]]; then
		ROOT_ID="$ROOT"
	else
		[[ $BOOTLDR =~ (systemd-boot|refind-efi|efistub) ]] && uuid_type="PARTUUID"
		ROOT_ID="$uuid_type=$(blkid -s $uuid_type -o value $ROOT)"
	fi

	if [[ $SYS == 'UEFI' ]]; then
		# remove our old install and generic BOOT/ dir
		echo "Removing conflicting boot directories"
		if [[ -d "$MNT/boot/EFI/$DIST" ]]; then
			find "$MNT/boot/EFI/" -maxdepth 1 -mindepth 1 -iname "$DIST" -type d -delete -printf "remove %p\n"
			find "$MNT/boot/EFI/" -maxdepth 1 -mindepth 1 -iname 'BOOT' -type d -delete -printf "remove %p\n"
		fi
	fi

	if [[ $SWAP ]]; then # attempt to setup swap space for suspend/resume
		if [[ $SWAP == /dev/mapper* ]]; then
			RESUME="resume=$SWAP "
		elif [[ $SWAP == "/swapfile" ]]; then
			RESUME="resume=$ROOT_ID resume_offset=$(filefrag -v "${MNT}$SWAP" | awk '{if ($1=="0:") {gsub(/\./, ""); print $4}}') "
		else
			RESUME="resume=$uuid_type=$(blkid -s $uuid_type -o value "$SWAP") "
		fi
	fi

	prerun_$BOOTLDR
	chrun "${BCMDS[$BOOTLDR]}" 2> "$ERR" 2>&1
	errshow 1 "chrun '${BCMDS[$BOOTLDR]}'"

	if [[ -d $MNT/hostrun ]]; then
		echo "Unmounting chroot directories"
		# cleanup the bind mounts we made earlier for the grub-probe module
		umount_dir "$MNT/hostrun/"{udev,lvm}
		rm -rf "$MNT/hostrun" > /dev/null 2>&1
	fi

	if [[ $SYS == 'UEFI' ]]; then
		# some UEFI firmware requires a generic esp/BOOT/BOOTX64.EFI
		mkdir -pv "$MNT/boot/EFI/BOOT"
		case "$BOOTLDR" in
			grub)
				cp -fv "$MNT/boot/EFI/$DIST/grubx64.efi" "$MNT/boot/EFI/BOOT/BOOTX64.EFI"
				;;
			syslinux)
				cp -rf "$MNT/boot/EFI/syslinux/"* "$MNT/boot/EFI/BOOT/"
				cp -f "$MNT/boot/EFI/syslinux/syslinux.efi" "$MNT/boot/EFI/BOOT/BOOTX64.EFI"
				;;
			refind-efi)
				k="linux-hardened,linux-zen,linux-lts,linux"
				sed -i "/#extra_kernel_version_strings/ c extra_kernel_version_strings $k" "$MNT/boot/EFI/refind/refind.conf"
				cp -fv "$MNT/boot/EFI/refind/refind_x64.efi" "$MNT/boot/EFI/BOOT/BOOTX64.EFI"
				;;
		esac
	fi

	return 0
}

install_packages()
{
	typeset -a inpkg rmpkg loginpkg

	inpkg=("${SES_PKGS[@]}" "${USER_PKGS[@]}")

	if [[ $INSTALL_WMS ]]; then
		inpkg+=("${BASE_PKGS[@]}")
		[[ $INSTALL_WMS =~ ($WM_PKG_SES) ]] && inpkg+=("${WM_PKGS[@]}")
	fi

	for i in ${LOGIN_PKGS[$LOGIN_TYPE]}; do
		loginpkg+=("$i")
	done

	if [[ $PACSTRAP -eq 1 ]]; then
		blk="$(lsblk -f)"
		lspci | grep -qi 'broadcom' && inpkg+=('b43-firmware' 'b43-fwcutter' 'broadcom-wl')
		grep -qi 'ntfs' <<< "$blk" && inpkg+=('ntfs-3g')
		grep -qi 'jfs' <<< "$blk" && inpkg+=('jfsutils')
		grep -qi 'xfs' <<< "$blk" && inpkg+=('xfsprogs')
		grep -qi 'reiserfs' <<< "$blk" && inpkg+=('reiserfsprogs')
		[[ $LVM ]] && inpkg+=('lvm2')
		if [[ $BTRFS_MNT ]] || grep -qi 'btrfs' <<< "$blk"; then
			inpkg+=('btrfs-progs')
		fi
	else
		[[ $NEWSHELL == 'zsh' ]] || rmpkg+=('zsh')
		if pacman -Qq archlabs-installer >/dev/null 2>&1; then
			rmpkg+=('archlabs-installer')
		else
			rm -fv "$MNT/usr/bin/installer"
		fi
	fi

	[[ $INSTALL_WMS =~ dwm ]] && inpkg+=('git')
	[[ $NEWSHELL == 'zsh' ]] && inpkg+=('zsh-completions')
	[[ $NEWSHELL =~ (bash|zsh) ]] && inpkg+=('bash-completion')

	# remove the packages we don't want on the installed system
	[[ ${rmpkg[*]} ]] && chrun "pacman -Rnsc ${rmpkg[*]} --noconfirm"

	# install crucial packages first to avoid issues, reinstalling iputils fixes network issues for non-root users
	chrun "pacman -S $KERNEL $UCODE iputils --noconfirm" 2> "$ERR" 2>&1
	errshow 1 "chrun 'pacman -S $KERNEL $UCODE iputils --noconfirm'"

	# install the packages chosen throughout the install plus any extras added
	chrun "pacman -S ${inpkg[*]} ${loginpkg[*]} $NEWSHELL --needed --noconfirm" 2> "$ERR" 2>&1
	errshow 1 "chrun 'pacman -S ${inpkg[*]}${loginpkg[*]} $NEWSHELL --needed --noconfirm'"

	# bootloader packages
	if [[ $BOOTLDR == 'grub' ]]; then
		chrun "pacman -S os-prober grub --needed --noconfirm" 2> "$ERR" 2>&1
		errshow 1 "chrun 'pacman -S os-prober grub --needed --noconfirm'"
	elif [[ $BOOTLDR == 'refind-efi' ]]; then
		chrun "pacman -S refind-efi --needed --noconfirm" 2> "$ERR" 2>&1
		errshow 1 "chrun 'pacman -S refind-efi --needed --noconfirm'"
	elif [[ $BOOTLDR == 'syslinux' ]]; then
		chrun "pacman -S syslinux --needed --noconfirm" 2> "$ERR" 2>&1
		errshow 1 "chrun 'pacman -S syslinux --needed --noconfirm'"
	fi
	if [[ $SYS == 'UEFI' ]]; then
		chrun "pacman -S efibootmgr --needed --noconfirm" 2> "$ERR" 2>&1
		errshow 1 "chrun 'pacman -S efibootmgr --needed --noconfirm'"
	fi

	if [[ $VM == 'oracle' ]]; then
		chrun "pacman -S ${KERNEL}-headers virtualbox-guest-utils virtualbox-guest-dkms --needed --noconfirm"
	fi

	return 0
}

install_suckless()
{
	local dir="$1/suckless"
	shift

	if [[ $1 == 'chroot' ]]; then
		chrun "mkdir -pv '$dir'"
		for i in dwm dmenu st; do
			if chrun "git clone 'https://git.suckless.org/$i' '$dir/$i'"; then
				chrun "cd '$dir/$i' && make PREFIX=/usr install"
			else
				printf "failed to clone %s repo\n" "$i"
			fi
		done
	else
		mkdir -pv "$dir"
		for i in dwm dmenu st; do
			if git clone "https://git.suckless.org/$i" "$dir/$i"; then
				cd "$dir/$i" && make PREFIX=/usr install
			else
				printf "failed to clone %s repo\n" "$i"
			fi
		done
	fi
}

install_tearfree()
{
	local xpath="$1"

	if [[ $VM != 'none' ]]; then
		[[ -e "$xpath/40-touchpad.conf" ]] && rm -fv "$xpath/40-touchpad.conf"
	elif [[ $TEARFREE ]]; then
		if lspci | grep ' VGA ' | grep -q 'Intel'; then
			echo "Creating Intel Tear Free config /etc/X11/xorg.conf.d/20-intel.conf"
			cat > "$xpath/20-intel.conf" <<- EOF
			Section "Device"
				Identifier  "Intel Graphics"
				Driver      "intel"
				Option      "TearFree" "true"
			EndSection
			EOF
			cat "$xpath/20-intel.conf"
		elif lspci | grep ' VGA ' | grep -q 'AMD/ATI.*RX\|AMD/ATI.*R[579]'; then # newer RX, R5, R7, and R9 cards can use the amdgpu driver
			echo "Creating AMD Tear Free config /etc/X11/xorg.conf.d/20-amdgpu.conf"
			cat > "$xpath/20-amdgpu.conf" <<- EOF
			Section "Device"
				Identifier  "AMD Graphics"
				Driver      "amdgpu"
				Option      "TearFree" "true"
			EndSection
			EOF
			cat "$xpath/20-amdgpu.conf"
		elif lspci | grep ' VGA ' | grep -q 'AMD/ATI.*HD [2-6][0-9]*'; then # older HD 2xxx-6xxx cards must use the radeon driver
			echo "Creating Radeon Tear Free config /etc/X11/xorg.conf.d/20-radeon.conf"
			cat > "$xpath/20-radeon.conf" <<- EOF
			Section "Device"
				Identifier  "AMD Graphics"
				Driver      "radeon"
				Option      "TearFree" "on"
			EndSection
			EOF
			cat "$xpath/20-radeon.conf"
		elif lspci | grep ' VGA ' | grep -q 'NVIDIA'; then # nvidia cards require a bit of checking for notebook gpus
			echo "Trying nvidia driver install"
			if lspci | grep ' VGA ' | grep -q 'Intel\|AMD' && lspci | grep ' VGA ' | grep -q 'NVIDIA.*[6-9][1-8][05]M[X]\?\|NVIDIA.*Quadro.*[KMP][1-6][0-2][0]*M'; then
				if [[ $xpath == *"$MNT"* ]]; then
					chrun "nvidia-installer --bumblebee"
				else
					nvidia-installer --bumblebee
				fi
			else
				if [[ $xpath == *"$MNT"* ]]; then
					chrun "nvidia-installer" # unsure which card so try auto detection
				else
					nvidia-installer
				fi
			fi
			if [[ -e $xpath/20-nvidia.conf ]]; then
				cat "$xpath/20-nvidia.conf"
				echo
				echo "NVIDIA driver installed"
				if [[ $xpath == *"$MNT"* ]]; then
					echo "Trying to load the driver for live session"
					nvidia-smi -r
				fi
				echo "To enable driver vsync:"
				echo -e "\trun nvidia-settings (as root) on first boot\n\tenable 'ForceFullCompositionPipeline' under the advanced settings"
				echo -e "\tlastly save the change to your nvida xorg config /etc/X11/xorg.conf.d/20-nvidia.conf"
				echo -e "\tand remove everything but the Device and Screen sections from the file"
			else
				echo "Unable to install nvidia driver"
			fi
		fi

		if lspci | grep ' VGA ' | grep -q 'Intel\|AMD/ATI'; then
			if [[ $xpath == *"$MNT"* ]]; then
				sed -i 's/xrender/glx/g' "$MNT/etc/skel/.config/picom.conf"
			else
				sed -i 's/xrender/glx/g' /etc/skel/.config/picom.conf
			fi
		fi
	fi

	if [[ $PACSTRAP != 1 ]]; then
		# remove nvidia installer from installed system
		[[ $xpath == *"$MNT"* ]] && rm -rf "$MNT/usr/bin/nvidia-installer" "$MNT/var/lib/nvidia-installer"
	fi
}

install_mkinitcpio()
{
	local add=''

	[[ $LUKS ]] && add+=" encrypt"
	[[ $LVM ]] && add+=" lvm2"
	[[ $SWAP ]] && add+=" resume"
	sed -i "s/block filesystems/block${add} filesystems ${HOOKS}/g" "$MNT/etc/mkinitcpio.conf"
	chrun "mkinitcpio -p $KERNEL" 2> "$ERR" 2>&1
	errshow 1 "chrun 'mkinitcpio -p $KERNEL'"
}

install_mirrorlist()
{
	if [[ $AUTO_MIR ]]; then
		timedatectl set-ntp 1 && timedatectl > /dev/null 2>&1
		reflector --verbose --score 80 -l 40 -f 5 --sort rate --save /etc/pacman.d/mirrorlist
	else
		echo "ranking mirrorlist, this may take a while..."
		cp -f /etc/pacman.d/mirrorlist /tmp/mirrors
		rankmirrors -n 6 /tmp/mirrors > /etc/pacman.d/mirrorlist
	fi
}

install_background()
{
	local luks='' net='networkmanager'

	[[ ! -d /etc/NetworkManager/system-connections ]] && net='netctl'
	[[ $LUKS ]] && luks='cryptsetup'

	if hash reflector > /dev/null 2>&1 && yesno 'Mirrorlist' "$_mirrors"; then
		AUTO_MIR=true
	else
		AUTO_MIR=''
		install_mirror_country
	fi

	if hash rsync > /dev/null 2>&1; then
		yesno 'Background Install' "$_bginstall" 'Pacstrap' 'Copy ISO' || PACSTRAP=0
	fi
	(
		install_mirrorlist > /tmp/bgout 2>&1

		if [[ $PACSTRAP == 1 ]]; then
			pacman -Sy >> /tmp/bgout 2>&1
			pacstrap /mnt >> /tmp/bgout 2>&1
		else
			rsync -avh /run/archiso/sfs/airootfs/ "$MNT/" >> /tmp/bgout 2>&1
		fi

		cp /etc/pacman.conf "$MNT/etc/pacman.conf"
		cp /etc/pacman.d/mirrorlist "$MNT/etc/pacman.d/mirrorlist"
		al_repo "$MNT/etc/pacman.conf"

		if [[ $PACSTRAP == 1 ]]; then
			chrun "pacman -S ${ISO_PKGS[*]} $net $luks --noconfirm --needed" >> /tmp/bgout 2>&1
		else
			chrun 'pacman -Sy' >> /tmp/bgout 2>&1
			chrun "pacman -S $net --noconfirm --needed" >> /tmp/bgout 2>&1
		fi

		if [[ $net == "networkmanager" ]]; then
			chrun 'systemctl enable NetworkManager.service' >> /tmp/bgout 2>&1
		else
			chrun 'systemctl enable netctl.service' >> /tmp/bgout 2>&1
		fi

		if [[ -e /tmp/wmlist ]]; then
			chrun "pacman -S ${BASE_PKGS[*]} --noconfirm --needed" >> /tmp/bgout 2>&1
		fi
	) &

	BG_PID=$!
	# shellcheck disable=SC2064
	trap "kill $BG_PID 2> /dev/null" EXIT
}

install_mirror_country()
{
	local conf='' tmp=''

	until [[ $conf ]]; do
		local url=''
		dlg CODES check "Mirror Country" "\nSelect which countries to use for mirrors from the list below." \
			AU Australia "$(ofn AU "$CODES")"            AT Austria "$(ofn AT "$CODES")" \
			BA "Bosnia Herzegovina" "$(ofn BA "$CODES")" BY Belarus "$(ofn BY "$CODES")" \
			BE Belgium "$(ofn BE "$CODES")"              BR Brazil "$(ofn BR "$CODES")" \
			BG Bulgaria "$(ofn BG "$CODES")"             CA Canada "$(ofn CA "$CODES")" \
			CL Chile "$(ofn CL "$CODES")"                CN China "$(ofn CN "$CODES")" \
			CO Colombia "$(ofn CO "$CODES")"             CZ "Czech Republic" "$(ofn CZ "$CODES")" \
			DK Denmark "$(ofn DK "$CODES")"              EE Estonia "$(ofn EE "$CODES")" \
			FI Finland "$(ofn FI "$CODES")"              FR France "$(ofn FR "$CODES")" \
			DE Germany "$(ofn DE "$CODES")"              GB "United Kingdom" "$(ofn GB "$CODES")" \
			GR Greece "$(ofn GR "$CODES")"               HU Hungary "$(ofn HU "$CODES")" \
			IN India "$(ofn IN "$CODES")"                IE Ireland "$(ofn IE "$CODES")" \
			IL Israel "$(ofn IL "$CODES")"               IT Italy "$(ofn IT "$CODES")" \
			JP Japan "$(ofn JP "$CODES")"                KZ Kazakhstan "$(ofn KZ "$CODES")" \
			KR Korea "$(ofn KR "$CODES")"                LT Lithuania "$(ofn LT "$CODES")" \
			LV Latvia "$(ofn LV "$CODES")"               LU Luxembourg "$(ofn LU "$CODES")" \
			MK Macedonia "$(ofn MK "$CODES")"            NL Netherlands "$(ofn NL "$CODES")" \
			NC "New Caledonia" "$(ofn NC "$CODES")"      NZ "New Zealand" "$(ofn NZ "$CODES")" \
			NO Norway "$(ofn NO "$CODES")"               PL Poland "$(ofn PL "$CODES")" \
			PT Portugal "$(ofn PT "$CODES")"             RO Romania "$(ofn RO "$CODES")" \
			RU Russia "$(ofn RU "$CODES")"               RS Serbia "$(ofn RS "$CODES")" \
			SG Singapore "$(ofn SG "$CODES")"            SK Slovakia "$(ofn SK "$CODES")" \
			ZA "South Africa" "$(ofn ZA "$CODES")"       ES Spain "$(ofn ES "$CODES")" \
			LK "Sri Lanka" "$(ofn LK "$CODES")"          SE Sweden "$(ofn SE "$CODES")" \
			CH Switzerland "$(ofn CH "$CODES")"          TW Taiwan "$(ofn TW "$CODES")" \
			TR Turkey "$(ofn TR "$CODES")"               UA Ukraine "$(ofn UA "$CODES")" \
			US "United States" "$(ofn US "$CODES")"      UZ Uzbekistan "$(ofn UZ "$CODES")" \
			VN Vietnam "$(ofn VN "$CODES")" || return 1

		# build the url to use
		for i in $CODES; do
			if [[ $url ]]; then
				url+="&country=$i"
			else
				url="https://www.archlinux.org/mirrorlist/?country=$i"
			fi
		done
		url+="&use_mirror_status=on"

		msg "Mirror Country" "\nDownloading the latest mirrorlist for the chosen countries.\n\n$url\n" 0
		tmp="$(mktemp --suffix=-mirrorlist)"
		curl -fsSL $url -o $tmp 2> "$ERR"
		errshow 0 "curl -fsSL $url -o $tmp" || return 1
		sed -i 's/^#Server/Server/g' "$tmp"

		# let the user edit and confirm it
		$EDITOR "$tmp"
		if yesno "Mirror Country" "\nUse the newly created mirrorlist for installation?\n"; then
			conf=true
		else
			rm -f "$tmp"
		fi
	done
	cp -f "$tmp" /etc/pacman.d/mirrorlist
	chmod +r /etc/pacman.d/mirrorlist
}

###############################################################################
# display manager config
# these are called based on which DM is chosen after it is installed
# additional config can be handled here, for now only lightdm and xinit.

config_gdm()
{
	: #TODO
}

config_sddm()
{
	: #TODO
}

config_xinit()
{
	if [[ $INSTALL_WMS ]]; then
		sed -i "/exec/ c exec ${LOGIN_WM}" "$MNT/home/$NEWUSER/.xinitrc"
		if [[ $LOGIN_WM == 'gnome-session' ]]; then
			# see https://wiki.archlinux.org/index.php/GNOME#Manually
			sed -i '/exec/ i export XDG_SESSION_TYPE=x11' "$MNT/home/$NEWUSER/.xinitrc"
			sed -i '/exec/ i export GDK_BACKEND=x11' "$MNT/home/$NEWUSER/.xinitrc"
		fi
	else
		rm -rf "$MNT/home/$NEWUSER/.xinitrc" "$MNT/root/.xinitrc"
		return 0
	fi

	if [[ $AUTOLOGIN ]]; then
		mkdir -p "$AUTOLOGIN_SERV"
		cat > "$AUTOLOGIN_SERV/autologin.conf" <<- EOF
		[Service]
		ExecStart=
		ExecStart=-/sbin/agetty --autologin $NEWUSER --noclear %I 38400 linux
		EOF
	else
		rm -rf "$AUTOLOGIN_SERV"
	fi

	# run `startx` after logging in regardless of autologin
	cat > "$MNT/home/$NEWUSER/$LOGINRC" <<- EOF
	# automatically run startx when logging in on tty1
	[ -z "\$DISPLAY" ] && [ \$XDG_VTNR -eq 1 ] && startx
	EOF
}

config_lightdm()
{
	sed -i "/greeter-session=/ c greeter-session=lightdm-$LIGHTDM_GREETER" "$MNT/etc/lightdm/lightdm.conf"

	if [[ $LIGHTDM_GREETER == 'gtk-greeter' ]]; then
		cat > "$MNT/etc/lightdm/lightdm-gtk-greeter.conf" <<- EOF
		[greeter]
		default-user-image=/usr/share/icons/ArchLabs-Dark/64x64/places/distributor-logo-archlabs.png
		background=/usr/share/backgrounds/archlabs/archlabs.jpg
		theme-name=Adwaita-dark
		icon-theme-name=Adwaita
		font-name=DejaVu Sans Mono 11
		position=30%,end 50%,end
		EOF
	fi
}

###############################################################################
# bootloader setup
# prerun_* set up the configs needed before actually running the commands
# setup_* are run after selecting a bootloader and build the command used later
# they can also be used for further user input as these run before control is taken away

setup_grub()
{
	EDIT_FILES[bootloader]="/etc/default/grub"

	if [[ $SYS == 'BIOS' ]]; then
		[[ $BOOT_D ]] || { part_device 1 || return 1; }
		BCMDS[grub]="grub-install --verbose --recheck --force --target=i386-pc $BOOT_D"
	else
		BCMDS[grub]="mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1
		grub-install --verbose --recheck --force --target=x86_64-efi --efi-directory=/boot --bootloader-id='$DIST'"
		grep -q /sys/firmware/efi/efivars /proc/mounts || mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1
	fi

	BCMDS[grub]="mkdir -p /run/udev /run/lvm && mount --bind /hostrun/udev /run/udev && mount --bind /hostrun/lvm /run/lvm &&
		${BCMDS[grub]} && grub-mkconfig -o /boot/grub/grub.cfg && sleep 1 && umount /run/udev /run/lvm"

	return 0
}

prerun_grub()
{
	sed -i "s/GRUB_DISTRIBUTOR=.*/GRUB_DISTRIBUTOR=\"${DIST}\"/g; s/GRUB_CMDLINE_LINUX_DEFAULT=.*/GRUB_CMDLINE_LINUX_DEFAULT=\"\"/g" "$MNT/etc/default/grub"
	if [[ $LUKS_DEV ]]; then
		sed -i "s~#GRUB_ENABLE_CRYPTODISK~GRUB_ENABLE_CRYPTODISK~g; s~GRUB_CMDLINE_LINUX=.*~GRUB_CMDLINE_LINUX=\"${LUKS_DEV}\"~g" "$MNT/etc/default/grub"
	fi
	if [[ $SYS == 'BIOS' && $LVM && -z $SEP_BOOT ]]; then
		sed -i "s/GRUB_PRELOAD_MODULES=.*/GRUB_PRELOAD_MODULES=\"lvm\"/g" "$MNT/etc/default/grub"
	fi
	# setup for os-prober module
	mkdir -p /run/{lvm,udev} "$MNT/hostrun/"{lvm,udev}
	mount --bind /run/lvm "$MNT/hostrun/lvm"
	mount --bind /run/udev "$MNT/hostrun/udev"

	return 0
}

setup_efistub()
{
	EDIT_FILES[bootloader]=""
}

prerun_efistub()
{
	BCMDS[efistub]="mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1
		efibootmgr -v -d $BOOT_D -p $BOOT_NUM -c -L '${DIST} Linux' -l /vmlinuz-${KERNEL} \
			-u 'root=$ROOT_ID rw $(
					[[ $BTRFS_MNT ]] && printf '%s ' "$BTRFS_MNT"
					[[ $UCODE ]] && printf 'initrd=\%s.img ' "$UCODE"
					)initrd=\initramfs-${KERNEL}.img'"
}

setup_syslinux()
{
	if [[ $SYS == 'BIOS' ]]; then
		EDIT_FILES[bootloader]="/boot/syslinux/syslinux.cfg"
	else
		EDIT_FILES[bootloader]="/boot/EFI/syslinux/syslinux.cfg"
		BCMDS[syslinux]="mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1
		efibootmgr -v -c -d $BOOT_D -p $BOOT_NUM -l /EFI/syslinux/syslinux.efi -L $DIST"
	fi
}

prerun_syslinux()
{
	local c="$MNT/boot/syslinux" s="/usr/lib/syslinux/bios"
	local d=".." # for non-UEFI systems we need to use ../path

	if [[ $SYS == 'UEFI' ]]; then
		 c="$MNT/boot/EFI/syslinux" s="/usr/lib/syslinux/efi64" d='';
	fi

	mkdir -pv "$c"
	cp -rfv "$s/"* "$c/"
	cp -fv "$RUN/syslinux/splash.png" "$c/"

	cat > "$c/syslinux.cfg" <<- EOF
	UI vesamenu.c32
	MENU TITLE $DIST Boot Menu
	MENU BACKGROUND splash.png
	TIMEOUT 50
	DEFAULT $DIST

	# see: https://www.syslinux.org/wiki/index.php/Comboot/menu.c32
	MENU WIDTH 78
	MENU MARGIN 4
	MENU ROWS 4
	MENU VSHIFT 10
	MENU TIMEOUTROW 13
	MENU TABMSGROW 14
	MENU CMDLINEROW 14
	MENU HELPMSGROW 16
	MENU HELPMSGENDROW 29
	MENU COLOR border       30;44   #40ffffff #a0000000 std
	MENU COLOR title        1;36;44 #9033ccff #a0000000 std
	MENU COLOR sel          7;37;40 #e0ffffff #20ffffff all
	MENU COLOR unsel        37;44   #50ffffff #a0000000 std
	MENU COLOR help         37;40   #c0ffffff #a0000000 std
	MENU COLOR timeout_msg  37;40   #80ffffff #00000000 std
	MENU COLOR timeout      1;37;40 #c0ffffff #00000000 std
	MENU COLOR msg07        37;40   #90ffffff #a0000000 std
	MENU COLOR tabmsg       31;40   #30ffffff #00000000 std

	LABEL $DIST
	MENU LABEL $DIST Linux
	LINUX $d/vmlinuz-$KERNEL
	APPEND root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT")
	INITRD $([[ $UCODE ]] && printf "%s" "$d/$UCODE.img,")$d/initramfs-$KERNEL.img

	LABEL ${DIST}fallback
	MENU LABEL $DIST Linux Fallback
	LINUX $d/vmlinuz-$KERNEL
	APPEND root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT")
	INITRD $([[ $UCODE ]] && printf "%s" "$d/$UCODE.img,")$d/initramfs-$KERNEL-fallback.img
	EOF
	return 0
}

setup_refind-efi()
{
	EDIT_FILES[bootloader]="/boot/refind_linux.conf"
	BCMDS[refind-efi]="mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1; refind-install"
}

prerun_refind-efi()
{
	cat > "$MNT/boot/refind_linux.conf" <<- EOF
	"$DIST Linux"          "root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT") add_efi_memmap $([[ $UCODE ]] &&
						printf "initrd=%s " "/$UCODE.img")initrd=/initramfs-%v.img"
	"$DIST Linux Fallback" "root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT") add_efi_memmap $([[ $UCODE ]] &&
						printf "initrd=%s " "/$UCODE.img")initrd=/initramfs-%v-fallback.img"
	EOF

	mkdir -p "$MNT/etc/pacman.d/hooks"

	cat > "$MNT/etc/pacman.d/hooks/refind.hook" <<- EOF
	[Trigger]
	Operation = Upgrade
	Type = Package
	Target = refind-efi

	[Action]
	Description = Updating rEFInd on ESP
	When = PostTransaction
	Exec = /usr/bin/refind-install
	EOF
}

setup_systemd-boot()
{
	EDIT_FILES[bootloader]="/boot/loader/entries/$DIST.conf"
	BCMDS[systemd-boot]="mount -t efivarfs efivarfs /sys/firmware/efi/efivars > /dev/null 2>&1; systemd-machine-id-setup && bootctl --path=/boot install"
}

prerun_systemd-boot()
{
	mkdir -pv "$MNT/boot/loader/entries"

	cat > "$MNT/boot/loader/loader.conf" <<- EOF
	default  $DIST.conf
	timeout  5
	editor   no
	EOF

	cat > "$MNT/boot/loader/entries/$DIST.conf" <<- EOF
	title   $DIST Linux
	linux   /vmlinuz-${KERNEL}$([[ $UCODE ]] && printf "\ninitrd  %s" "/$UCODE.img")
	initrd  /initramfs-$KERNEL.img
	options root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT")
	EOF

	cat > "$MNT/boot/loader/entries/$DIST-fallback.conf" <<- EOF
	title   $DIST Linux Fallback
	linux   /vmlinuz-${KERNEL}$([[ $UCODE ]] && printf "\ninitrd  %s" "/$UCODE.img")
	initrd  /initramfs-$KERNEL-fallback.img
	options root=$ROOT_ID ${LUKS_DEV}${RESUME}rw$([[ $BTRFS_MNT ]] && printf ' %s' "$BTRFS_MNT")
	EOF

	mkdir -pv "$MNT/etc/pacman.d/hooks"

	cat > "$MNT/etc/pacman.d/hooks/systemd-boot.hook" <<- EOF
	[Trigger]
	Type = Package
	Operation = Upgrade
	Target = systemd

	[Action]
	Description = Updating systemd-boot
	When = PostTransaction
	Exec = /usr/bin/bootctl update
	EOF
	return 0
}

###############################################################################
# btrfs functions

btrfs_name()
{
	local txt="$1"
	local exists="$2"

	SUBVOL=''
	until [[ $SUBVOL ]]; do
		dlg SUBVOL input "Subvolume Name" "$txt" || return 1
		if [[ -z $SUBVOL ]]; then
			return 1
		elif [[ $SUBVOL =~ \ |\' || $exists == *"$SUBVOL"* ]]; then
			msg "Subvolume Name Error" "$_errvolname"
			SUBVOL=''
		fi
	done
	return 0
}

btrfs_mount()
{
	local part="$1"
	local mntp="$2"
	local subvol="$3"

	[[ $mntp == "$MNT" ]] && BTRFS_MNT="rootflags=subvol=$subvol"
	select_mntopts "$part" 'btrfs' && [[ $MNT_OPTS ]] && MNT_OPTS+=','
	mount -o ${MNT_OPTS}subvol="$subvol" "$part" "$mntp" 2> "$ERR"
	errshow 0 "mount -o ${MNT_OPTS}subvol=$subvol $part $mntp" || return 1
	msg "Mount Complete" "\nMounted $part subvol=$subvol at $mntp\n" 1
}

btrfs_subvols()
{
	local part="$1"
	local mntp="${MNT}$2"
	local mvol=''

	btrfs_name "\nEnter a name for the initial subvolume on $part e.g. 'subvol_root'." || return 1
	mvol="$SUBVOL"
	btrfs subvolume create "$mntp/$mvol" > /dev/null 2> "$ERR"
	errshow 0 "btrfs subvolume create $mntp/$mvol" || return 1

	umount_dir "$mntp" || return 1
	btrfs_mount "$part" "$mntp" "$mvol" || return 1

	btrfs_extsubvols "$mntp" "$mvol" || return 1
	msg "Btrfs Setup" "\nSubvolume(s) created successfully.\n\nSubvolume root '$mvol' mounted at $mntp\n$([[ $SUBVOL_COUNT -gt 0 ]] && ls -R "$mntp")"
}

btrfs_extsubvols()
{
	local mntp="$1"
	local mvol="$2"
	local list=''
	local n=0

	SUBVOL_COUNT=0
	dlg SUBVOL_COUNT menu "Subvolume Count" "\nSelect the number of subvolumes to create in: $mvol" \
		0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 -
	while (( ++n <= SUBVOL_COUNT )); do
		local txt="\nEnter a name for subvolume $n within '$mvol'."
		if (( n > 1 )); then
			btrfs_name "$txt\n\nCreated subvolumes: $list" "$list $mvol" || return 1
		else
			btrfs_name "$txt" "$mvol" || return 1
		fi
		btrfs subvolume create "$mntp/$SUBVOL" > /dev/null 2> "$ERR"
		errshow 0 "btrfs subvolume create $mntp/$SUBVOL" || return 1
		list+="$SUBVOL "
	done
	return 0
}

###############################################################################
# lvm functions

lvm_menu()
{
	is_bg_install || return 1
	lvm_detect
	local choice
	while :; do
		dlg choice menu "Logical Volume Management" "$_lvmmenu" \
			'create'     "Create a new volume group and volumes" \
			'remove'     "Delete an existing volume group" \
			'remove_all' "Delete ALL volume groups and volumes" \
			"back"       "Return to the device management menu"
		case "$choice" in
			'create') lvm_create && break ;;
			'remove') lvm_del_one && yesno "Remove Volume Group" "$_lvmdelask" && vgremove -f "$DEL_VG" > /dev/null 2>&1 ;;
			'remove_all') lvm_del_all ;;
			*) break ;;
		esac
	done
	return 0
}

lvm_detect()
{
	if [[ $(vgs -o vg_name --noheading 2> /dev/null) ]]; then
		if [[ $(lvs -o vg_name,lv_name --noheading --separator - 2> /dev/null) && $(pvs -o pv_name --noheading 2> /dev/null) ]]; then
			msg "LVM Setup" "\nActivating existing logical volume management.\n" 0
			modprobe dm-mod > /dev/null 2> "$ERR"
			errshow 0 'modprobe dm-mod > /dev/null'
			vgscan > /dev/null 2>&1
			vgchange -ay > /dev/null 2>&1
		fi
	fi
}

lvm_create()
{
	VGROUP='' LVM_PARTS='' VOL_COUNT=0 VGROUP_MB=0
	umount_dir "$MNT"
	lvm_mkgroup || return 1

	local txt="\nThe last (or only) logical volume will automatically use all remaining space in the volume group."
	dlg VOL_COUNT menu "Create Volume Group" "\nSelect the number of logical volumes (LVs) to create in: $VGROUP\n$txt" \
		1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 -
	[[ $VOL_COUNT ]] || return 1
	lvm_extra_lvs || return 1

	lvm_volume_name "$_lvmlvname\nNOTE: This LV will use up all remaining space in the volume group (${VGROUP_MB}MB)" || return 1
	msg "Create Volume Group (LV:$VOL_COUNT)" "\nCreating volume $VNAME from remaining space in $VGROUP\n" 0
	lvcreate -l +100%FREE "$VGROUP" -n "$VNAME" > /dev/null 2> "$ERR"
	errshow 0 "lvcreate -l +100%FREE $VGROUP -n $VNAME" || return 1

	LVM='logical volume'
	sleep 0.5
	txt="\nDone, volume: $VGROUP-$VNAME (${VOLUME_SIZE:-${VGROUP_MB}MB}) has been created.\n"
	msg "Create Volume Group (LV:$VOL_COUNT)" "$txt\n$(lsblk -o NAME,SIZE $LVM_PARTS)\n"
	return 0
}

lvm_lv_size()
{
	local txt="${VGROUP}: ${SIZE}$SIZE_UNIT (${VGROUP_MB}MB remaining).$_lvmlvsize"

	while :; do
		ERR_SIZE=0
		dlg VOLUME_SIZE input "Create Volume Group (LV:$VOL_COUNT)" "$txt"
		if [[ -z $VOLUME_SIZE ]]; then
			ERR_SIZE=1
			break # allow bailing with escape or an empty choice
		elif (( ! ${VOLUME_SIZE:0:1} )); then
			ERR_SIZE=1 # size values can't begin with '0'
		else
			# walk the string and make sure all but the last char are digits
			local lv=$((${#VOLUME_SIZE} - 1))
			for (( i=0; i<lv; i++ )); do
				[[ ${VOLUME_SIZE:$i:1} =~ [0-9] ]] || { ERR_SIZE=1; break; }
			done
			if (( ERR_SIZE != 1 )); then
				case ${VOLUME_SIZE:$lv:1} in
					[mMgG])
						local s=${VOLUME_SIZE:0:$lv} m=$((s * 1000))
						case ${VOLUME_SIZE:$lv:1} in
							[Gg])
								if (( m >= VGROUP_MB )); then
									ERR_SIZE=1
								else
									VGROUP_MB=$((VGROUP_MB - m))
								fi
								;;
							[Mm])
								if (( ${VOLUME_SIZE:0:$lv} >= VGROUP_MB )); then
									ERR_SIZE=1
								else
									VGROUP_MB=$((VGROUP_MB - s))
								fi
								;;
							*) ERR_SIZE=1
						esac
						;;
					*) ERR_SIZE=1
				esac
			fi
		fi
		(( ERR_SIZE )) || break
		msg "Invalid Logical Volume Size" "$_lvmerrlvsize" 2
	done

	return $ERR_SIZE
}

lvm_mkgroup()
{
	local named=''

	until [[ $named ]]; do
		lvm_partitions || return 1
		lvm_group_name || return 1
		yesno "Create Volume Group" "\nCreate volume group: $VGROUP\n\nusing these partition(s): $LVM_PARTS\n" && named=true
	done

	msg "Create Volume Group" "\nCreating volume group: $VGROUP\n" 0
	vgcreate -f "$VGROUP" $LVM_PARTS > /dev/null 2> "$ERR"
	errshow 0 "vgcreate -f '$VGROUP' $LVM_PARTS >/dev/null" || return 1

	SIZE=$(vgdisplay "$VGROUP" | awk '/VG Size/ { gsub(/[^0-9.]/, ""); print int($0) }')
	SIZE_UNIT="$(vgdisplay "$VGROUP" | awk '/VG Size/ { print substr($NF, 0, 1) }')"

	if [[ $SIZE_UNIT == 'G' ]]; then
		VGROUP_MB=$((SIZE * 1000))
	else
		VGROUP_MB=$SIZE
	fi

	msg "Create Volume Group" "\nVolume group $VGROUP (${SIZE}$SIZE_UNIT) successfully created\n" 2
}

lvm_del_all()
{
	local v pv
	pv="$(pvs -o pv_name --noheading 2> /dev/null)"
	v="$(lvs -o vg_name,lv_name --noheading --separator - 2> /dev/null)"
	VGROUP="$(vgs -o vg_name --noheading 2> /dev/null)"

	if [[ $VGROUP || $v || $pv ]]; then
		if yesno "Remove All Volume Groups" "$_lvmdelask"; then
			for i in $v; do lvremove -f "/dev/mapper/$i" > /dev/null 2>&1; done
			for i in $VGROUP; do vgremove -f "$i" > /dev/null 2>&1; done
			for i in $pv; do pvremove -f "$i" > /dev/null 2>&1; done
			LVM=''
		fi
		for i in $(lvmdiskscan | grep 'LVM physical volume' | grep 'sd[a-z]' | sed 's/\/dev\///' | awk '{print $1}'); do
			dd if=/dev/zero bs=512 count=512 of=/dev/${i} >/dev/null 2>&1
		done
	else
		msg "Delete LVM" "\nNo available LVM to remove...\n" 2
		LVM=''
	fi
}

lvm_del_one()
{
	DEL_VG=''
	VOL_GROUP_LIST=''

	for i in $(lvs --noheadings | awk '{print $2}' | sort | uniq); do
		VOL_GROUP_LIST+="$i $(vgdisplay "$i" | awk '/VG Size/ {print $3$4}') "
	done

	[[ $VOL_GROUP_LIST ]] || { msg "No Groups" "\nNo volume groups found."; return 1; }

	dlg DEL_VG menu "Logical Volume Management" "\nSelect volume group to delete.\n\nAll logical volumes within will also be deleted." $VOL_GROUP_LIST
	[[ $DEL_VG ]]
}

lvm_extra_lvs()
{
	while (( VOL_COUNT > 1 )); do
		lvm_volume_name "$_lvmlvname" || return 1
		lvm_lv_size || return 1

		msg "Create Volume Group (LV:$VOL_COUNT)" "\nCreating a $VOLUME_SIZE volume $VNAME in $VGROUP\n" 0
		lvcreate -L "$VOLUME_SIZE" "$VGROUP" -n "$VNAME" > /dev/null 2> "$ERR"
		errshow 0 "lvcreate -L '$VOLUME_SIZE' '$VGROUP' -n '$VNAME'" || return 1

		msg "Create Volume Group (LV:$VOL_COUNT)" "\nDone, logical volume (LV) $VNAME ($VOLUME_SIZE) has been created.\n"
		(( VOL_COUNT-- ))
	done
	return 0
}

lvm_partitions()
{
	part_find 'part|crypt' || return 1
	PARTS="$(awk 'NF > 0 {print $0 " off"}' <<< "$PARTS")"
	[[ $LUKS && $LUKS_PART ]] && part_countdec $LUKS_PART
	dlg LVM_PARTS check "Create Volume Group" "\nSelect the partition(s) to use for the physical volume (PV)." $PARTS
}

lvm_group_name()
{
	VGROUP=''
	until [[ $VGROUP ]]; do
		dlg VGROUP input "Create Volume Group" "$_lvmvgname"
		if [[ -z $VGROUP ]]; then
			return 1
		elif [[ ${VGROUP:0:1} == "/" || $VGROUP =~ \ |\' ]] || vgdisplay | grep -q "$VGROUP"; then
			msg "LVM Name Error" "$_errvolname"
			VGROUP=''
		fi
	done
	return 0
}

lvm_volume_name()
{
	VNAME=''
	local txt="$1"
	until [[ $VNAME ]]; do
		dlg VNAME input "Create Volume Group (LV:$VOL_COUNT)" "\n$txt"
		if [[ -z $VNAME ]]; then
			return 1
		elif [[ ${VNAME:0:1} == "/" || $VNAME =~ \ |\' ]] || lsblk | grep -q "$VNAME"; then
			msg "LVM Name Error" "$_errvolname"
			VNAME=''
		fi
	done
	return 0
}

###############################################################################
# luks functions

luks_menu()
{
	local choice
	is_bg_install || return 1
	while :; do
		dlg choice menu 'LUKS Encryption' "$_luksmenu" \
			'basic'    'LUKS setup with default settings' \
			'open'     'Open an existing LUKS partition' \
			'advanced' 'Specify cypher type and other flags for cryptsetup' \
			'back'     'Return to the device management menu'
		case "$choice" in
			'basic') luks_basic || return 1 ;;
			'open') luks_open || return 1 ;;
			'advanced') luks_advanced || return 1 ;;
			*) break ;;
		esac
	done
	return 0
}

luks_open()
{
	modprobe -a dm-mod dm_crypt > /dev/null 2>&1
	umount_dir "$MNT"
	part_find 'part|crypt|lvm' || return 1

	if (( PART_COUNT == 1 )); then
		LUKS_PART="$(awk 'NF > 0 {print $1}' <<< "$PARTS")"
	else
		[[ $LVM && $LVM_PARTS ]] && part_countdec $LVM_PARTS
		dlg LUKS_PART menu "LUKS Open" "\nSelect which partition to open." $PARTS
	fi

	[[ $LUKS_PART ]] || return 1

	luks_pass "LUKS Open" || return 1
	msg "LUKS Open" "\nOpening encryption: $LUKS_NAME\n\nUsing device/volume: $(part_pretty "$LUKS_PART")\n" 0
	cryptsetup open --type luks "$LUKS_PART" "$LUKS_NAME" <<< "$LUKS_PASS" 2> "$ERR"
	errshow 0 "cryptsetup open --type luks '$LUKS_PART' '$LUKS_NAME' <<< '$LUKS_PASS'" || return 1
	LUKS='encrypted'
	luks_show
	return 0
}

luks_pass()
{
	LUKS_PASS=''
	local t="$1"
	typeset -a ans=(cryptroot) # default name to start

	until [[ $LUKS_PASS ]]; do
		tput cnorm
		dialog --insecure --backtitle "$DIST Installer - $SYS - v$VER" \
			--separator $'\n' --title " $t " --mixedform "$_luksomenu" 0 0 0 \
			"Name:"      1 1 "${ans[0]}" 1  7 "$COLUMNS" 0 0 \
			"Password:"  2 1 ''          2 11 "$COLUMNS" 0 1 \
			"Password2:" 3 1 ''          3 12 "$COLUMNS" 0 1 2> "$ANS" || return 1

		mapfile -t ans <"$ANS"

		if [[ -z "${ans[0]}" ]]; then
			msg "Name Empty" "\nEncrypted device name cannot be empty.\n\nPlease try again.\n" 2
		elif [[ -z "${ans[1]}" || "${ans[1]}" != "${ans[2]}" ]]; then
			LUKS_NAME="${ans[0]}"
			msg "Password Mismatch" "\nThe passwords entered do not match.\n\nPlease try again.\n" 2
		else
			LUKS_NAME="${ans[0]}"
			LUKS_PASS="${ans[1]}"
		fi
	done

	return 0
}

luks_show()
{
	sleep 0.5
	msg "LUKS Encryption" "\nEncrypted partition ready for mounting.\n\n$(lsblk -o NAME,SIZE,FSTYPE "$LUKS_PART")\n\n"
}

luks_setup()
{
	modprobe -a dm-mod dm_crypt > /dev/null 2>&1
	umount_dir "$MNT"
	part_find 'part|lvm' || return 1

	if [[ $AUTO_ROOT ]]; then
		LUKS_PART="$AUTO_ROOT"
	elif (( PART_COUNT == 1 )); then
		LUKS_PART="$(awk 'NF > 0 {print $1}' <<< "$PARTS")"
	else
		[[ $LVM && $LVM_PARTS ]] && part_countdec $LVM_PARTS
		dlg LUKS_PART menu "LUKS Encryption" "\nSelect the partition you want to encrypt." $PARTS
	fi

	[[ $LUKS_PART ]] || return 1
	luks_pass "LUKS Encryption"
}

luks_basic()
{
	luks_setup || return 1
	msg "LUKS Encryption" "\nCreating encrypted partition: $LUKS_NAME\n\nDevice or volume used: $LUKS_PART\n" 0
	cryptsetup -q luksFormat "$LUKS_PART" <<< "$LUKS_PASS" 2> "$ERR"
	errshow 0 "cryptsetup -q luksFormat '$LUKS_PART' <<< '$LUKS_PASS'" || return 1
	cryptsetup open "$LUKS_PART" "$LUKS_NAME" <<< "$LUKS_PASS" 2> "$ERR"
	errshow 0 "cryptsetup open '$LUKS_PART' '$LUKS_NAME' <<< '$LUKS_PASS'" || return 1
	LUKS='encrypted'
	luks_show
	return 0
}

luks_advanced()
{
	luks_setup || return 1
	local cipher
	dlg cipher input "LUKS Encryption" "$_lukskey" "-s 512 -c aes-xts-plain64"
	[[ $cipher ]] || return 1
	msg "LUKS Encryption" "\nCreating encrypted partition: $LUKS_NAME\n\nDevice or volume used: $LUKS_PART\n" 0
	cryptsetup -q $cipher luksFormat "$LUKS_PART" <<< "$LUKS_PASS" 2> "$ERR"
	errshow 0 "cryptsetup -q $cipher luksFormat '$LUKS_PART' <<< '$LUKS_PASS'" || return 1
	cryptsetup open "$LUKS_PART" "$LUKS_NAME" <<< "$LUKS_PASS" 2> "$ERR"
	errshow 0 "cryptsetup open '$LUKS_PART' '$LUKS_NAME' <<< '$LUKS_PASS'" || return 1
	LUKS='encrypted'
	luks_show
	return 0
}

###############################################################################
# simple functions
# some help avoid repetition and improve usability of some commands
# others are initial setup functions used before reaching the main loop

ofn()
{
	[[ "$2" == *"$1"* ]] && printf "on" || printf "off"
}

die()
{
	# exit cleanly with exit code $1 or the last command's exit code
	# when $1 == 127 we unmount and reboot
	local e="${1:-$?}"

	trap - INT
	tput cnorm
	(( ! e )) && clear
	if [[ -d $MNT ]]; then
		umount_dir "$MNT"
		(( e == 127 )) && umount_dir /run/archiso/bootmnt && sleep 0.5 && reboot -f
	fi
	exit $e
}

dlg()
{
	local var="$1"   # assign output from dialog to var
	local dlg_t="$2" # dialog type (menu, check, input)
	local title="$3" # dialog title
	local body="$4"  # dialog message
	local n=0        # number of items to display for menu and check dialogs

	shift 4  # shift off args assigned above

	# adjust n when passed a large list
	local l=$((LINES - 20))
	(( ($# / 2) > l )) && n=$l

	case "$dlg_t" in
		menu)
			tput civis
			dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " $title " \
				--menu "$body" 0 0 $n "$@" 2> "$ANS" || return 1
			;;
		check)
			tput civis
			dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " $title " \
				--checklist "$body" 0 0 $n "$@" 2> "$ANS" || return 1
			;;
		input)
			tput cnorm
			if [[ $1 && $1 != 'limit' ]]; then
				local def="$1" # assign default value for input
				shift
			fi
			if [[ $1 == 'limit' ]]; then
				dialog --backtitle "$DIST Installer - $SYS - v$VER" --max-input 63 \
					--title " $title " --inputbox "$body" 0 0 "$def" 2> "$ANS" || return 1
			else
				dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " $title " \
					--inputbox "$body" 0 0 "$def" 2> "$ANS" || return 1
			fi
			;;
	esac
	# if answer file isn't empty read from it into $var
	[[ -s "$ANS" ]] && printf -v "$var" "%s" "$(< "$ANS")"
}

msg()
{
	# displays a message dialog
	# when more than 2 args the message will disappear after sleep time ($3)
	local title="$1"
	local body="$2"
	shift 2
	tput civis
	if (( $# )); then
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --sleep "$1" --title " $title " --infobox "$body\n" 0 0
	else
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " $title " --msgbox "$body\n" 0 0
	fi
}

live()
{
	local ses="$1"

	if ! select_keymap; then
		clear
		die 0
	elif ! net_connect; then
		msg "Not Connected" "\nRunning live requires an active internet connection to install packages.\n\nExiting..\n" 2
		die 1
	elif (( $(awk '/MemTotal/ {print int($2 * 1024 / 1000 / 1000)}' /proc/meminfo) < 4704)); then
		msg "Not Enough Memory" "\nLive session requires at least 4.5G of system memory for installing packages.\n\nExiting..\n" 2
		die 1
	fi

	clear
	echo "Sorting mirrorlist"
	if ! mount /run/archiso/cowspace -o remount,size=4G; then
		msg "Remount Fail" "\nUnable to remount root with a larger copy-on-write space, this is needed for installing packages.\n\nExiting..\n" 2
		die 1
	fi
	install_mirrorlist
	al_repo "/etc/pacman.conf"
	pacman -Syyu --noconfirm || die 1
	rm -rf /var/cache/pacman/pkg/* # */
	pacman -S ${BASE_PKGS[*]} xorg-xinit --needed --noconfirm || die 1
	rm -rf /var/cache/pacman/pkg/* # */
	case "$ses" in
		$WM_PKG_SES)
			pacman -S "$ses" ${WM_PKGS[*]} ${WM_EXT[$ses]} --needed --noconfirm || die 1
			;;
		$SELF_CONTAINED)
			pacman -S "$ses" ${WM_EXT[$ses]} --needed --noconfirm || die 1
			;;
		dwm)
			pacman -S git --needed --noconfirm || die 1
			install_suckless "/root" nochroot
			;;
	esac
	pacman -Scc --noconfirm
	rm -rf /var/cache/pacman/pkg/* # */
	cp -rfT /etc/skel /root
	install_tearfree "/etc/X11/xorg.conf.d"
	case "$ses" in
		$SELF_CONTAINED)
			sed -i '/super/d; /nitrogen/d; /picom/d' /root/.xprofile
			;;
		dwm)
			sed -i '/super/d; /picom/d' /root/.xprofile
			;;
	esac
	rm -f /root/.zlogin
	echo -e "pulseaudio &\n(sleep 1; pamixer --unmute --set-volume 50) &" >> /root/.xprofile
	sed -i "/exec/ c exec ${WM_SESSIONS[$ses]}" /root/.xinitrc
	printf "\n%s has been set as the login session in ~/.xinitrc, to start the session simply run\n\n\tstartx\n\n" "${WM_SESSIONS[$ses]}"
	die 0
}

usage()
{
	cat <<- EOF
	usage: $1 [-hDn] [-r ROOT] [-b BOOT] [-l SESSION] [-d DISTRO] [-m MOUNTPOINT]

	options:
	    -h		print this message and exit
	    -l		install and setup a live session
	    -D		enable xtrace and log output to $DBG
	    -m		set the mountpoint used for the new installation
	    -d		set the distribution name for the installed system
	    -n		no partitioning, mounting, or formatting (self mount)
	    -r		root partition to use for install, required when using -n
	    -b		boot partition to use for install, required on UEFI systems when using -n
	    -t		install and setup drivers for nvidia or tearfree xorg configs for other vendors
                if you experience boot issues with this option, remove /etc/X11/xorg.conf.d/20-*.conf

	sessions:
	    i3-gaps  - A fork of i3wm with more features including gaps
	    openbox  - A lightweight, powerful, and highly configurable stacking wm
	    dwm      - A dynamic WM for X that manages windows in tiled, floating, or monocle layouts
	    awesome  - A customized Awesome WM session created by @elanapan
	    lxqt     - A port of the lightweight desktop environment (LXDE) to Qt
	    bspwm    - A tiling wm that represents windows as the leaves of a binary tree
	    fluxbox  - A lightweight and highly-configurable window manager
	    jwm      - A lightweight window manager for Xorg written in C
	    gnome    - A desktop environment that aims to be simple and easy to use
	    cinnamon - A desktop environment combining traditional desktop with modern effects
	    plasma   - A kde software project currently comprising a full desktop environment
	    xfce4    - A lightweight and modular desktop environment based on gtk+2/3

	EOF
	exit 0
}

yesno()
{
	local title="$1"
	local body="$2"
	local yes='Yes'
	local no='No'
	(( $# >= 3 )) && yes="$3"
	(( $# >= 4 )) && no="$4"
	tput civis
	if (( $# == 5 )); then
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --defaultno \
			--title " $title " --yes-label "$yes" --no-label "$no" --yesno "$body\n" 0 0
	else
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " $title " \
			--yes-label "$yes" --no-label "$no" --yesno "$body\n" 0 0
	fi
}

chrun()
{
	arch-chroot "$MNT" bash -c "$1"
}

debug()
{
	export PS4='| ${BASH_SOURCE} LINE:${LINENO} FUNC:${FUNCNAME[0]:+ ${FUNCNAME[0]}()} |>  '
	set -x
	exec 3>| $DBG
	BASH_XTRACEFD=3
	DEBUG=true
}

errmsg()
{
	local err=""

	err="$(sed 's/[^[:print:]]//g; s/\[[0-9\;:]*\?m//g; s/==> //g; s/] ERROR:/]\nERROR:/g' "$ERR")"
	[[ -z $err ]] && err="no error message was output"
	printf "%s" "$err"
}

al_repo()
{
	local conf="$1"

	grep -q 'archlabs_repo' "$conf" && return 0

	cat >> "$conf" <<- EOF

	[archlabs_unstable]
	Server = https://bitbucket.org/archlabslinux/\$repo/raw/master/\$arch

	[archlabs_repo]
	Server = https://bitbucket.org/archlabslinux/\$repo/raw/master/\$arch
	Server = https://sourceforge.net/projects/archlabs-repo/files/\$repo/\$arch
	Server = https://github.com/ARCHLabs/\$repo/raw/master/\$arch

	EOF
}

termcol()
{
	local colors=(
	"\e]P0191919" # #191919
	"\e]P1D15355" # #D15355
	"\e]P2609960" # #609960
	"\e]P3FFCC66" # #FFCC66
	"\e]P4255A9B" # #255A9B
	"\e]P5AF86C8" # #AF86C8
	"\e]P62EC8D3" # #2EC8D3
	"\e]P7949494" # #949494
	"\e]P8191919" # #191919
	"\e]P9D15355" # #D15355
	"\e]PA609960" # #609960
	"\e]PBFF9157" # #FF9157
	"\e]PC4E88CF" # #4E88CF
	"\e]PDAF86C8" # #AF86C8
	"\e]PE2ec8d3" # #2ec8d3
	"\e]PFE1E1E1" # #E1E1E1
	)

	[[ $TERM == 'linux' ]] && printf "%b" "${colors[@]}" && clear
}

errshow()
{
	# shellcheck disable=SC2181
	[ $? -eq 0 ] && return 0

	local fatal=$1
	shift 1 # always shift off the fatal level arg

	if [[ $1 == *chrun* ]]; then
		local cmd="arch-chroot $MNT bash -c ${1##chrun }"
	else
		local cmd="$1"
	fi

	local txt
	txt="\nCommand: $cmd\n\n$(errmsg)\n\n"
	tput cnorm
	if (( fatal )); then
		dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " Install Error " --yes-label "Abort" --no-label "Continue" \
			--yesno "${txt}Errors at this stage must be fixed before the install can continue.\n$_errchoice\n" 0 0 || return 0
		[[ -r $DBG && $TERM == 'linux' ]] && less "$DBG"
		die 1
	fi
	dialog --backtitle "$DIST Installer - $SYS - v$VER" --title " Install Error " --yes-label "Abort" --no-label "Continue" \
		--yesno "${txt}Errors at this stage may not be serious depending on the command and error type.\n$_errchoice\n" 0 0 || return 0

	tput civis
	return 1
}

prechecks()
{
	local i=1

	if (( $1 >= 0 )) && ! grep -q " $MNT " /proc/mounts; then
		msg "Not Mounted" "\nPartition(s) must be mounted first.\n" 2
		if [[ $NOMOUNT ]]; then
			die 1
		else
			SEL=1
		fi
		i=0
	elif [[ $1 -ge 1 && -z $BOOTLDR ]]; then
		msg "No Bootloader" "\nBootloader must be selected first.\n" 2
		if [[ $NOMOUNT ]]; then
			SEL=0
		else
			SEL=2
		fi
		i=0
	elif [[ $1 -ge 2 && (-z $NEWUSER || -z $USER_PASS) ]]; then
		msg "No User" "\nA user must be created first.\n" 2
		if [[ $NOMOUNT ]]; then
			SEL=1
		else
			SEL=3
		fi
		i=0
	elif [[ $1 -ge 3 && -z $CONFIG_DONE ]]; then
		msg "No Config" "\nSystem configuration must be done first.\n" 2
		if [[ $NOMOUNT ]]; then
			SEL=2
		else
			SEL=4
		fi
		i=0
	fi
	(( i )) # return code
}

umount_dir()
{
	mount | grep -q 'swap' && swapoff -a
	for dir; do
		if [[ -d $dir ]] && grep -q " $dir " /proc/mounts; then
			if ! umount "$dir" 2> /dev/null; then
				sleep 0.5
				umount -f "$dir" 2> /dev/null || umount -l "$dir"
			fi
		fi
	done
}

chk_connect()
{
	if [[ ! -f /tmp/new ]]; then
		msg "Network Connect" "\nVerifying network connection\n" 0
		if [[ $VM != 'none' ]] && hash nm-online > /dev/null 2>&1; then
			nm-online > /dev/null 2>&1
		else
			ping -qc1 'archlinux.org' > /dev/null 2>&1
		fi
	fi
}

net_connect()
{
	if chk_connect; then
		return 0
	elif hash nmtui > /dev/null 2>&1; then
		tput civis
		if [[ $TERM == 'linux' ]]; then
			printf "%b" "\e]P1191919" "\e]P4191919" # fix up the nasty default colours of nmtui
			nmtui-connect
			printf "%b" "\e]P1D15355" "\e]P4255a9b" # restore defaults
		else
			nmtui-connect
		fi
	elif hash wifi-menu > /dev/null 2>&1; then
		wifi-menu
	else
		return 1
	fi
	chk_connect
}

dwm_xsession()
{
	mkdir -p "$MNT/usr/share/xsessions"
	cat > "$MNT/usr/share/xsessions/dwm.desktop" <<- EOF
	[Desktop Entry]
	Encoding=UTF-8
	Name=Dwm
	Comment=Dynamic Window Manager
	Exec=dwm
	TryExec=dwm
	Type=Application
	EOF
}

is_bg_install()
{
	[[ $BG_PID ]] || return 0
	msg "Install Running" "\nA background install process is currently running.\n" 2
	return 1
}

system_devices()
{
	IGNORE_DEV="$(lsblk -lno NAME,MOUNTPOINT | awk '/\/run\/archiso\/bootmnt/ {sub(/[1-9]/, ""); print $1}')"
	DEVS="$(lsblk -lno TYPE,PATH,SIZE,MODEL | awk '/disk/ && !'"/${IGNORE_DEV:-NONEXX}/"' {print $2, $3 "__" $4}')"
	DEV_COUNT=$(wc -l <<< "$DEVS")

	if [[ -z $DEVS ]]; then
		msg "Device Error" "\nNo available devices...\n\nExiting..\n" 2
		die 1
	fi
}

system_identify()
{
	if [[ $VM != 'none' ]]; then
		UCODE=''
	elif grep -q 'AuthenticAMD' /proc/cpuinfo; then
		UCODE="amd-ucode"
	elif grep -q 'GenuineIntel' /proc/cpuinfo; then
		UCODE="intel-ucode"
	fi

	modprobe -q efivarfs > /dev/null 2>&1

	if [[ -d /sys/firmware/efi/efivars ]]; then
		SYS="UEFI"
		grep -q /sys/firmware/efi/efivars /proc/mounts || mount -t efivarfs efivarfs /sys/firmware/efi/efivars
	else
		SYS="BIOS"
	fi
}

###############################################################################
# entry point

termcol

MISSING=""
for i in dialog find parted curl arch-chroot; do
	hash $i >/dev/null 2>&1 || MISSING+="$i "
done

if [[ $MISSING ]]; then
	printf "This installer requires the following package(s) to be installed:\n\n\t%s" "$MISSING"
	die 1
elif (( UID != 0 )); then
	msg "Not Root" "\nThis installer must be run as root.\n\nExiting..\n" 2
	die 1
elif ! grep -qm 1 ' lm ' /proc/cpuinfo; then
	msg "Not x86_64" "\nThis installer only supports x86_64 architectures.\n\nExiting..\n" 2
	die 1
fi

trap 'printf "\n^C\n" && die 1' INT

while getopts ":htl:Dnr:b:m:d:" OPT; do
	case "$OPT" in
		D) debug ;;
		h) usage "$0" ;;
		n) NOMOUNT=true ;;
		t) TEARFREE=true ;;
		m) MNT="$OPTARG" ;;
		d) DIST="$OPTARG" ;;
		r)
			[[ -b $OPTARG ]] || { msg "Invalid Root" "\nThe installer expects a full path to a block device for root.\n\nExiting..\n" 2; die 1; }
			ROOT="$OPTARG"
			;;
		b)
			[[ -b $OPTARG ]] || { msg "Invalid Boot" "\nThe installer expects a full path to a block device for boot.\n\nExiting..\n" 2; die 1; }
			BOOT="$OPTARG"
			;;
		l)
			[[ "${!WM_SESSIONS[*]}" =~ $OPTARG ]] || { echo "error: invalid session for -l, see -h for help"; die 1; }
			live "$OPTARG"
			;;
		\?)
			echo "invalid option: $OPTARG"
			die 2
			;;
	esac
done

if [[ ! -d $MNT ]]; then
	msg "Invalid Mountpoint" "\nThe installer expects an existing directory for mounting.\n\nExiting..\n" 2
	die 2
elif [[ -z $DIST ]]; then
	msg "Invalid Distribution" "\nThe distribution name cannot be empty.\n\nExiting..\n" 2
	die 2
fi

system_identify
system_devices

if [[ $NOMOUNT ]]; then
	if [[ -z $ROOT || ($SYS == 'UEFI' && -z $BOOT) ]]; then
		msg "Invalid Partitions" "$_errpart" 0
		die 2
	fi
	if [[ $BOOT ]]; then
		part_bootdev
		[[ $BOOT != "$ROOT" ]] && SEP_BOOT=true
	fi
fi

if [[ $TERM == 'linux' ]]; then
	if [[ -f /tmp/font ]]; then
		FONT="$(< /tmp/font)"
		setfont "$FONT"
	else
		fontsize=16
		while [[ $TERM == 'linux' && ! -f /tmp/font ]]; do
			dlg fontsize menu "Font Size" "\nSelect a font size from the list below.\n\nDefault: 16" \
				12 "setfont ter-i12n" 14 "setfont ter-i14n" 16 "setfont ter-i16n" 18 "setfont ter-i18n" \
				20 "setfont ter-i20n" 22 "setfont ter-i22n" 24 "setfont ter-i24n" 28 "setfont ter-i28n" \
				32 "setfont ter-i32n" || break

			FONT="ter-i${fontsize}n"
			setfont "$FONT"
			yesno "Font Size" "\nKeep the currently set font size?\n" && echo "ter-i${fontsize}n" > /tmp/font
		done
	fi
fi

if [[ ! -f /tmp/weld ]]; then
	msg "Welcome to the $DIST Installer" "\nThis will help you get $DIST installed and setup on your system.\n\nIf you are unsure about an option, the default or most common\nwill be mentioned or the first selected entry will be the default.\n\n\nMenu Navigation:\n\n - Select items with the arrow keys or the option number.\n - Use [Space] to toggle check boxes and [Enter] to accept.\n - Switch between fields using [Tab] or the arrow keys.\n - Use [Page Up] and [Page Down] to jump whole pages\n - Press the highlighted key of an option to select it.\n"
	touch /tmp/weld
fi

if ! select_keymap; then
	clear
	die 0
elif ! net_connect; then
	msg "Not Connected" "\nThis installer requires an active internet connection.\n\nExiting..\n" 2
	die 1
fi

if [[ ! -f /tmp/new ]]; then
	msg "Installer Update" "\nChecking for newer installer versions.\n" 1
	if curl -fsSL 'https://bitbucket.org/archlabslinux/installer/raw/master/installer' -o /tmp/new; then
		if (( $(vercmp "$(awk -F= '/^VER=/ {print $2}' /tmp/new)" "$VER") > 0 )); then
			cp /tmp/new /usr/bin/installer
			chmod +x /usr/bin/installer
			exec /usr/bin/installer "$@"
		fi
	else
		msg "Download Failed" "\nUnable to download the latest version, continuing with the current.\n" 2
	fi
fi

# warn before starting the background process
if [[ $NOMOUNT ]]; then
	wrn="\nA background install process will begin early when using -n flag\n\nSome files may be overwritten during the process\n"
	yesno "Data Warning" "$wrn\nProceed?\n" || die 0
	install_background
fi

while :; do
	main
done
# vim:fdm=marker:fmr={,}