Going to one-script solution

script/config.sh

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+# Configuration parameters for YaFDE 
+
+# Storage device to install the linux.  
+export DEV="/dev/sda"
+
+# Whether you want to erase all contents of the storage device or not.
+# 1 : Yes, I want to erase all.
+# 0 : No, I don't. I want to add to the existing LUKS volume. 
+export ERASEALL=1
+
+# Logical Volume name for your Linux installation. Keep it unique from other distribution.
+export LVROOTNAME="ubuntu"
+
+# Logical volume size of the Linux installation.
+# 30% mean, new logical volume will use 30% of the free space in the LVM volume group.
+# For example, assume the free space is 100GB, and LVROOTSIZE is 30%FREE. Script will create 30GB logical volume.  
+export LVROOTSIZE="50%FREE"
+
+# Set the size of EFI partition and swap partition. The unit is Byte. you can use M,G... notation.
+export EFISIZE="100M"
+export LVSWAPSIZE="8G"
+
+# Usually, these names can be left untouched. 
+# If you change, keep them consistent through all instllation in your system.
+export CRYPTPARTNAME="luks_volume"
+export VGNAME="vg1"
+export LVSWAPNAME="swap"
+
+# Void Linux only. Ignored in Ubuntu.
+# The font size of the void-installer
+export XTERMFONTSIZE=11
+
+# !!!!!!!!!!!!!! DO NOT EDIT FOLLOWING LINES. !!!!!!!!!!!!!!
+
+# Detect firmware type. 1 : EFI, 0 : BIOS
+if [ -d /sys/firmware/efi ]; then
+export ISEFI=1  # Yes, EFI
+else
+export ISEFI=0  # No, BIOS
+fi # is EFI firmaare? 
+
+# Set partition number based on the firmware type
+if [  ${ISEFI} -eq 1  ] ; then 
+# EFI firmware
+export EFIPARTITION=1
+export CRYPTPARTITION=2
+else
+# BIOS firmware
+export CRYPTPARTITION=1
+fi  # EFI firmware