From f1a43e9c5451184e5590a285168463ad85bc68ff Mon Sep 17 00:00:00 2001
From: Suikan <26223147+suikan4github@users.noreply.github.com>
Date: Thu, 1 Jul 2021 21:42:41 +0900
Subject: [PATCH] Refactored.

All function body is indented.
kaiten-yaki-* has main function.
"sourced" style is not enforced.
---
 script/common/confirmation.sh    | 134 +++++++--------
 script/common/parainstall.sh     |  65 ++++---
 script/common/parainstall_msg.sh |  38 ++---
 script/common/preinstall.sh      | 160 +++++++++---------
 script/ubuntu-kaiten-yaki.sh     | 258 ++++++++++++++--------------
 script/void-kaiten-yaki.sh       | 280 ++++++++++++++++---------------
 6 files changed, 475 insertions(+), 460 deletions(-)

diff --git a/script/common/confirmation.sh b/script/common/confirmation.sh
index 67803cf..c2fd49c 100644
--- a/script/common/confirmation.sh
+++ b/script/common/confirmation.sh
@@ -5,91 +5,91 @@
 
 function confirmation(){
 
-# Sanity check for volume group name
-if echo ${VGNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume group name.
-	cat <<HEREDOC 1>&2
-***** ERROR : VGNAME is "${VGNAME}" *****
-THe "-" is not allowed in the volume name. 
-Check passphrase and config.txt
+	# Sanity check for volume group name
+	if echo ${VGNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume group name.
+		cat <<- HEREDOC 1>&2
+		***** ERROR : VGNAME is "${VGNAME}" *****
+		THe "-" is not allowed in the volume name. 
+		Check passphrase and config.txt
 
-Installation terminated.
-HEREDOC
+		Installation terminated.
+		HEREDOC
 		return 1
-fi # "-" is found in the volume group name.
+	fi # "-" is found in the volume group name.
 
-# Sanity check for root volume name
-if echo ${LVROOTNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
-	cat <<HEREDOC 1>&2
-***** ERROR : LVROOTNAME is "${LVROOTNAME}" *****
-THe "-" is not allowed in the volume name. 
-Check passphrase and config.txt
+	# Sanity check for root volume name
+	if echo ${LVROOTNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
+		cat <<- HEREDOC 1>&2
+		***** ERROR : LVROOTNAME is "${LVROOTNAME}" *****
+		THe "-" is not allowed in the volume name. 
+		Check passphrase and config.txt
 
-Installation terminated.
-HEREDOC
+		Installation terminated.
+		HEREDOC
 		return 1
-fi # "-" is found in the volume name.
+	fi # "-" is found in the volume name.
 
-# Sanity check for swap volume name
-if echo ${LVSWAPNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
-	cat <<HEREDOC 1>&2
-***** ERROR : LVSWAPNAME is "${LVSWAPNAME}" *****
-THe "-" is not allowed in the volume name. 
-Check passphrase and config.txt
+	# Sanity check for swap volume name
+	if echo ${LVSWAPNAME} | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
+		cat <<- HEREDOC 1>&2
+		***** ERROR : LVSWAPNAME is "${LVSWAPNAME}" *****
+		THe "-" is not allowed in the volume name. 
+		Check passphrase and config.txt
 
-Installation terminated.
-HEREDOC
+		Installation terminated.
+		HEREDOC
 		return 1
-fi # "-" is found in the volume name.
+	fi # "-" is found in the volume name.
 
-# For surre ask the config.sh is edited
-cat <<HEREDOC
+	# For surre ask the config.sh is edited
+	cat <<- HEREDOC
 
-The destination logical volume label is "${LVROOTNAME}"
-"${LVROOTNAME}" uses ${LVROOTSIZE} of the LVM volume group.
-Are you ready to install? [Y/N]
-HEREDOC
-read YESNO
-if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
-	cat <<HEREDOC 1>&2
-
-Installation terminated.
-HEREDOC
-	return 1
-fi	# if YES
-
-# For sure ask ready to erase. 
-if [ ${ERASEALL} -eq 1 ] ; then
-	echo "Are you sure you want to erase entire ${DEV}? [Y/N]"
+	The destination logical volume label is "${LVROOTNAME}"
+	"${LVROOTNAME}" uses ${LVROOTSIZE} of the LVM volume group.
+	Are you ready to install? [Y/N]
+	HEREDOC
 	read YESNO
 	if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
-		cat <<HEREDOC 1>&2
-Check config.sh. The variable ERASEALL is ${ERASEALL}.
+		cat <<- HEREDOC 1>&2
 
-Installation terminated.
-HEREDOC
+		Installation terminated.
+		HEREDOC
 		return 1
 	fi	# if YES
-fi	# if erase all
 
-# ----- Set Passphrase -----
-# Input passphrase
-echo "Type passphrase for the disk encryption."
-read -sr PASSPHRASE
-export PASSPHRASE
+	# For sure ask ready to erase. 
+	if [ ${ERASEALL} -eq 1 ] ; then
+		echo "Are you sure you want to erase entire ${DEV}? [Y/N]"
+		read YESNO
+		if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
+			cat <<-HEREDOC 1>&2
+		Check config.sh. The variable ERASEALL is ${ERASEALL}.
 
-echo "Type passphrase again, to confirm."
-read -sr PASSPHRASE_C
+		Installation terminated.
+		HEREDOC
+		return 1
+		fi	# if YES
+	fi	# if erase all
 
-# Validate whether both are indentical or not
-if [ ${PASSPHRASE} != ${PASSPHRASE_C} ] ; then
-	cat <<HEREDOC 1>&2
-***** ERROR : Passphrase doesn't match *****
+	# ----- Set Passphrase -----
+	# Input passphrase
+	echo "Type passphrase for the disk encryption."
+	read -sr PASSPHRASE
+	export PASSPHRASE
 
-Installation terminated.
-HEREDOC
-	return 1
-fi	# passphrase validation
+	echo "Type passphrase again, to confirm."
+	read -sr PASSPHRASE_C
 
-# succesfull return
-return 0
+	# Validate whether both are indentical or not
+	if [ ${PASSPHRASE} != ${PASSPHRASE_C} ] ; then
+		cat <<-HEREDOC 1>&2
+		***** ERROR : Passphrase doesn't match *****
+
+		Installation terminated.
+		HEREDOC
+		return 1
+	fi	# passphrase validation
+
+	# succesfull return
+	return 0
 }
diff --git a/script/common/parainstall.sh b/script/common/parainstall.sh
index 6bf48d4..0dfdc79 100644
--- a/script/common/parainstall.sh
+++ b/script/common/parainstall.sh
@@ -5,44 +5,43 @@
 
 function parainstall() {
 
-# While the /etc/default/grub in the install target is NOT existing, keep sleeping.
-# If installer terminated without file copy, this script also terminates.
-while [ ! -e ${TARGETMOUNTPOINT}/etc/default/grub ]
-do
+	# While the /etc/default/grub in the install target is NOT existing, keep sleeping.
+	# If installer terminated without file copy, this script also terminates.
+	while [ ! -e ${TARGETMOUNTPOINT}/etc/default/grub ]
+	do
+		sleep 1 # 1sec.
+
+		# Check if installer still exist
+		if ! ps $installer_pid  > /dev/null ; then	# If not exists
+			cat <<-HEREDOC 1>&2
+			The installer terminated unexpectedly. 
+
+			Installation process terminated.
+			HEREDOC
+			return 1
+		fi
+	done # while
+
+	# Perhaps, too neuvous. Wait 1 more sectond to avoid the rece condition.
 	sleep 1 # 1sec.
 
-	 # Check if installer still exist
-	if ! ps $installer_pid  > /dev/null ; then	# If not exists
-	cat <<HEREDOC 1>&2
-The installer terminated unexpectedly. 
-
-Installation process terminated.
-HEREDOC
-	return 1
-
+	# Make target GRUB aware to the crypt partition
+	# This must do it after start of the file copy by installer, but before the end of the file copy.
+	# If the environment is not GUI, keep quiet not to bother the TUI installer. 
+	if [ ${PARAINSTMSG} -eq 1 ]; then
+		echo "...Add GRUB_ENABLE_CRYPTODISK entry to ${TARGETMOUNTPOINT}/etc/default/grub "
 	fi
-done # while
-
-# Perhaps, too neuvous. Wait 1 more sectond to avoid the rece condition.
-sleep 1 # 1sec.
-
-# Make target GRUB aware to the crypt partition
-# This must do it after start of the file copy by installer, but before the end of the file copy.
-# If the environment is not GUI, keep quiet not to bother the TUI installer. 
-if [ ${PARAINSTMSG} -eq 1 ]; then
-	echo "...Add GRUB_ENABLE_CRYPTODISK entry to ${TARGETMOUNTPOINT}/etc/default/grub "
-fi
-echo "GRUB_ENABLE_CRYPTODISK=y" >> ${TARGETMOUNTPOINT}/etc/default/grub
+	echo "GRUB_ENABLE_CRYPTODISK=y" >> ${TARGETMOUNTPOINT}/etc/default/grub
 
 
-# And then, wait for the end of installer process
-# If the environment is not GUI, keep quiet not to bother the TUI installer. 
-if [ ${PARAINSTMSG} -eq 1 ]; then
-	echo "...Waiting for the end of GUI/TUI installer."
-fi
-wait $installer_pid
+	# And then, wait for the end of installer process
+	# If the environment is not GUI, keep quiet not to bother the TUI installer. 
+	if [ ${PARAINSTMSG} -eq 1 ]; then
+		echo "...Waiting for the end of GUI/TUI installer."
+	fi
+	wait $installer_pid
 
-# succesfull return
-return 0
+	# succesfull return
+	return 0
 
 } # para install
diff --git a/script/common/parainstall_msg.sh b/script/common/parainstall_msg.sh
index 16f9c1d..3b84a88 100644
--- a/script/common/parainstall_msg.sh
+++ b/script/common/parainstall_msg.sh
@@ -2,29 +2,29 @@
 
 function parainstall_msg() {
 
-cat <<HEREDOC
-******************************************************************************
-The pre-install process is done. We are ready to install the Linux to the 
-target storage device. By pressing return key, GUI/TUI installer starts.
+	cat <<- HEREDOC
+	******************************************************************************
+	The pre-install process is done. We are ready to install the Linux to the 
+	target storage device. By pressing return key, GUI/TUI installer starts.
 
-Please pay attention to the partition/logical volume mapping configuration. 
-In this installation, you have to map the previously created partitions/logical
-volumes to the appropriate directories of the target system as followings :
+	Please pay attention to the partition/logical volume mapping configuration. 
+	In this installation, you have to map the previously created partitions/logical
+	volumes to the appropriate directories of the target system as followings :
 
-HEREDOC
+	HEREDOC
 
-# In the EFI system, add this mapping
-if [  ${ISEFI} -eq 1 ] ; then
-	echo "/boot/efi        : ${DEV}${EFIPARTITION}"
-fi
+	# In the EFI system, add this mapping
+	if [  ${ISEFI} -eq 1 ] ; then
+		echo "/boot/efi        : ${DEV}${EFIPARTITION}"
+	fi
 
-# Root volume mapping
-echo "/                : /dev/mapper/${VGNAME}-${LVROOTNAME}"
+	# Root volume mapping
+	echo "/                : /dev/mapper/${VGNAME}-${LVROOTNAME}"
 
-# In case of erased storage, add this mapping
-if [ ${ERASEALL} -eq 1 ] ; then
-	echo "swap             : /dev/mapper/${VGNAME}-${LVSWAPNAME}"
-fi
+	# In case of erased storage, add this mapping
+	if [ ${ERASEALL} -eq 1 ] ; then
+		echo "swap             : /dev/mapper/${VGNAME}-${LVSWAPNAME}"
+	fi
 
-return 0
+	return 0
 }
\ No newline at end of file
diff --git a/script/common/preinstall.sh b/script/common/preinstall.sh
index 6d51982..295a45d 100644
--- a/script/common/preinstall.sh
+++ b/script/common/preinstall.sh
@@ -6,90 +6,90 @@
 function pre_install() {
 
 
-# ----- Erase entire disk, create partitions, format them  and encrypt the LUKS partition -----
-if [ ${ERASEALL} -eq 1 ] ; then
+	# ----- Erase entire disk, create partitions, format them  and encrypt the LUKS partition -----
+	if [ ${ERASEALL} -eq 1 ] ; then
 
-	# Assign specified space and rest of disk to the EFI and LUKS partition, respectively.
-	if [  ${ISEFI} -eq 1 ] ; then
-		# Zap existing partition table and create new GPT
-		echo "...Initialize ${DEV} with GPT."
-		sgdisk --zap-all "${DEV}"
-		# Create EFI partition and format it
-		echo "...Create an EFI partition on ${DEV}."
-		sgdisk --new=${EFIPARTITION}:0:+${EFISIZE} --change-name=${EFIPARTITION}:"EFI System"  --typecode=${EFIPARTITION}:ef00 "${DEV}"  
-		echo "...Format the EFI parttion."
-		mkfs.vfat -F 32 -n EFI-SP "${DEV}${EFIPARTITION}"
-		# Create Linux partition
-		echo "...Create a Linux partition on ${DEV}."
-		sgdisk --new=${CRYPTPARTITION}:0:0    --change-name=${CRYPTPARTITION}:"Linux LUKS" --typecode=${CRYPTPARTITION}:8309 "${DEV}"
-		# Then print them
-		sgdisk --print "${DEV}"
+		# Assign specified space and rest of disk to the EFI and LUKS partition, respectively.
+		if [  ${ISEFI} -eq 1 ] ; then
+			# Zap existing partition table and create new GPT
+			echo "...Initialize ${DEV} with GPT."
+			sgdisk --zap-all "${DEV}"
+			# Create EFI partition and format it
+			echo "...Create an EFI partition on ${DEV}."
+			sgdisk --new=${EFIPARTITION}:0:+${EFISIZE} --change-name=${EFIPARTITION}:"EFI System"  --typecode=${EFIPARTITION}:ef00 "${DEV}"  
+			echo "...Format the EFI parttion."
+			mkfs.vfat -F 32 -n EFI-SP "${DEV}${EFIPARTITION}"
+			# Create Linux partition
+			echo "...Create a Linux partition on ${DEV}."
+			sgdisk --new=${CRYPTPARTITION}:0:0    --change-name=${CRYPTPARTITION}:"Linux LUKS" --typecode=${CRYPTPARTITION}:8309 "${DEV}"
+			# Then print them
+			sgdisk --print "${DEV}"
+		else
+			# Zap existing partition table
+			echo "...Erase partition table of ${DEV}."
+			dd if=/dev/zero of=${DEV} bs=512 count=1
+			# Create MBR and allocate max storage for Linux partition
+			echo "...Create a Linux partition on ${DEV} with MBR."
+			sfdisk ${DEV} <<- HEREDOC
+			2M,,L
+			HEREDOC
+		fi	# if EFI firmware
+
+		# Encrypt the partition to install Linux
+		echo "...Initialize ${DEV}${CRYPTPARTITION} as crypt partition"
+		printf %s "${PASSPHRASE}" | cryptsetup luksFormat --type=luks1 --key-file - --batch-mode "${DEV}${CRYPTPARTITION}"
+
+	fi	# if erase all
+
+	# ----- Open the LUKS partition -----
+	# Open the crypt partition. 
+	echo "...Open a crypt partition ${DEV}${CRYPTPARTITION} as \"${CRYPTPARTNAME}\""
+	printf %s "${PASSPHRASE}" | cryptsetup open -d - "${DEV}${CRYPTPARTITION}" ${CRYPTPARTNAME}
+
+	# Check whether successful open. If mapped, it is successful. 
+	if [ ! -e /dev/mapper/${CRYPTPARTNAME} ] ; then 
+		cat <<- HEREDOC 1>&2
+		***** ERROR : Cannot open LUKS volume "${CRYPTPARTNAME}" on ${DEV}${CRYPTPARTITION}. *****
+		Check passphrase and config.txt
+
+		Installation terminated.
+		HEREDOC
+		return 1
+	fi	# if crypt volume is unable to open
+
+	# ----- Configure the LVM in LUKS volume -----
+	# Check volume group ${VGNAME} exist or not
+	if  vgdisplay -s ${VGNAME} &> /dev/null ; then		# if exist
+		echo "...Volume group ${VGNAME} already exist. Skipped to create. No problem."
 	else
-		# Zap existing partition table
-		echo "...Erase partition table of ${DEV}."
-		dd if=/dev/zero of=${DEV} bs=512 count=1
-		# Create MBR and allocate max storage for Linux partition
-		echo "...Create a Linux partition on ${DEV} with MBR."
-		sfdisk ${DEV} <<HEREDOC
-2M,,L
-HEREDOC
-	fi	# if EFI firmware
+		echo "...Initialize a physical volume on \"${CRYPTPARTNAME}\""
+		pvcreate /dev/mapper/${CRYPTPARTNAME}
+		echo "...And then create Volume group \"${VGNAME}\"."
+		vgcreate ${VGNAME} /dev/mapper/${CRYPTPARTNAME}
+	fi # if /dev/volume-groupt exist
 
-	# Encrypt the partition to install Linux
-	echo "...Initialize ${DEV}${CRYPTPARTITION} as crypt partition"
-	printf %s "${PASSPHRASE}" | cryptsetup luksFormat --type=luks1 --key-file - --batch-mode "${DEV}${CRYPTPARTITION}"
+	# Create a SWAP Logical Volume on VG, if it doesn't exist
+	if [ -e /dev/mapper/${VGNAME}-${LVSWAPNAME} ] ; then 
+		echo "...Swap volume already exist. Skipped to create. No problem."
+	else
+		echo "...Create logical volume \"${LVSWAPNAME}\" on \"${VGNAME}\"."
+		lvcreate -L ${LVSWAPSIZE} -n ${LVSWAPNAME} ${VGNAME} 
+	fi	# if /dev/mapper/swap volume already exit. 
 
-fi	# if erase all
+	# Create a ROOT Logical Volume on VG. 
+	if [ -e /dev/mapper/${VGNAME}-${LVROOTNAME} ] ; then 
+		cat <<- HEREDOC 1>&2
+		***** ERROR : Logical volume "${VGNAME}-${LVROOTNAME}" already exists. *****
+		Check LVROOTNAME environment variable in config.txt.
 
-# ----- Open the LUKS partition -----
-# Open the crypt partition. 
-echo "...Open a crypt partition ${DEV}${CRYPTPARTITION} as \"${CRYPTPARTNAME}\""
-printf %s "${PASSPHRASE}" | cryptsetup open -d - "${DEV}${CRYPTPARTITION}" ${CRYPTPARTNAME}
+		Installation terminated.
+		HEREDOC
+		return 1
+	else
+		echo "...Create logical volume \"${LVROOTNAME}\" on \"${VGNAME}\"."
+		lvcreate -l ${LVROOTSIZE} -n ${LVROOTNAME} ${VGNAME}
+	fi	# if the root volun already exist
 
-# Check whether successful open. If mapped, it is successful. 
-if [ ! -e /dev/mapper/${CRYPTPARTNAME} ] ; then 
-	cat <<HEREDOC 1>&2
-***** ERROR : Cannot open LUKS volume "${CRYPTPARTNAME}" on ${DEV}${CRYPTPARTITION}. *****
-Check passphrase and config.txt
-
-Installation terminated.
-HEREDOC
-	return 1
-fi	# if crypt volume is unable to open
-
-# ----- Configure the LVM in LUKS volume -----
-# Check volume group ${VGNAME} exist or not
-if  vgdisplay -s ${VGNAME} &> /dev/null ; then		# if exist
-	echo "...Volume group ${VGNAME} already exist. Skipped to create. No problem."
-else
-	echo "...Initialize a physical volume on \"${CRYPTPARTNAME}\""
-	pvcreate /dev/mapper/${CRYPTPARTNAME}
-	echo "...And then create Volume group \"${VGNAME}\"."
-	vgcreate ${VGNAME} /dev/mapper/${CRYPTPARTNAME}
-fi # if /dev/volume-groupt exist
-
-# Create a SWAP Logical Volume on VG, if it doesn't exist
-if [ -e /dev/mapper/${VGNAME}-${LVSWAPNAME} ] ; then 
-	echo "...Swap volume already exist. Skipped to create. No problem."
-else
-	echo "...Create logical volume \"${LVSWAPNAME}\" on \"${VGNAME}\"."
-	lvcreate -L ${LVSWAPSIZE} -n ${LVSWAPNAME} ${VGNAME} 
-fi	# if /dev/mapper/swap volume already exit. 
-
-# Create a ROOT Logical Volume on VG. 
-if [ -e /dev/mapper/${VGNAME}-${LVROOTNAME} ] ; then 
-	cat <<HEREDOC 1>&2
-***** ERROR : Logical volume "${VGNAME}-${LVROOTNAME}" already exists. *****
-Check LVROOTNAME environment variable in config.txt.
-
-Installation terminated.
-HEREDOC
-	return 1
-else
-	echo "...Create logical volume \"${LVROOTNAME}\" on \"${VGNAME}\"."
-	lvcreate -l ${LVROOTSIZE} -n ${LVROOTNAME} ${VGNAME}
-fi	# if the root volun already exist
-
-# successful return
-return 0
+	# successful return
+	return 0
 }
diff --git a/script/ubuntu-kaiten-yaki.sh b/script/ubuntu-kaiten-yaki.sh
index 54d4192..a34928e 100644
--- a/script/ubuntu-kaiten-yaki.sh
+++ b/script/ubuntu-kaiten-yaki.sh
@@ -1,162 +1,170 @@
 #!/bin/bash -u
 
-# Load configuration parameter
-source config.sh
+function main() {
+	# Load configuration parameter
+	source config.sh
 
-# Load functions
-source common/confirmation.sh
-source common/preinstall.sh
-source common/parainstall.sh
-source common/parainstall_msg.sh
+	# Load functions
+	source common/confirmation.sh
+	source common/preinstall.sh
+	source common/parainstall.sh
+	source common/parainstall_msg.sh
 
-# Varidate whether script is executed as sourced or not
-(return 0 2>/dev/null) && sourced=1 || sourced=0
-if [ $sourced -eq 0 ] ; then
-	cat <<HEREDOC 1>&2
-***** ERROR : Must execute as "sourced" *****
-Execute as following : 
-source ubuntu-kaiten-yaki.sh
+	# Varidate whether script is executed as sourced or not
+	(return 0 2>/dev/null) && sourced=1 || sourced=0
+	if [ $sourced -eq 0 ] ; then
+		cat <<- HEREDOC 1>&2
+		***** ERROR : Must execute as "sourced" *****
+		Execute as following : 
+		source ubuntu-kaiten-yaki.sh
 
-Installation terminated.
-HEREDOC
-	exit    # use "exit" instead of "return", if not "sourced" execusion
-fi # "sourced" validation
+		Installation terminated.
+		HEREDOC
+		exit    # use "exit" instead of "return", if not "sourced" execusion
+	fi # "sourced" validation
 
-# This is the mount point of the install target. 
-export TARGETMOUNTPOINT="/target"
-# 1 : Show message during GUI/TUI installer, 0 : Do not show.
-export PARAINSTMSG=1
+	# This is the mount point of the install target. 
+	export TARGETMOUNTPOINT="/target"
+	# 1 : Show message during GUI/TUI installer, 0 : Do not show.
+	export PARAINSTMSG=1
 
-# Distribution check
-if ! uname -a | grep ubuntu -i > /dev/null  ; then	# "Ubuntu" is not found in the OS name.
-	echo "*******************************************************************************"
-	uname -a
-	cat <<HEREDOC 
-*******************************************************************************
-This system seems to be not Ubuntu, while this script is dediated to the Ubuntu.
-Are you sure you want to run this script? [Y/N]
-HEREDOC
-	read YESNO
-	if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
-		cat <<HEREDOC 1>&2
+	# Distribution check
+	if ! uname -a | grep ubuntu -i > /dev/null  ; then	# "Ubuntu" is not found in the OS name.
+		echo "*******************************************************************************"
+		uname -a
+		cat <<- HEREDOC 
+		*******************************************************************************
+		This system seems to be not Ubuntu, while this script is dediated to the Ubuntu.
+		Are you sure you want to run this script? [Y/N]
+		HEREDOC
+		read YESNO
+		if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
+			cat <<- HEREDOC 1>&2
 
-Installation terminated.
-HEREDOC
-		return
-	fi	# if YES
+			Installation terminated.
+			HEREDOC
+			return 1
+		fi	# if YES
 
-fi # "Ubuntu" is not found in the OS name.
+	fi # "Ubuntu" is not found in the OS name.
 
-# ******************************************************************************* 
-#                                Confirmation before installation 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Confirmation before installation 
+	# ******************************************************************************* 
 
-# Common part of the parameter confirmation
-if ! confirmation ; then
-	return 1
-fi
+	# Common part of the parameter confirmation
+	if ! confirmation ; then
+		return 1
+	fi
 
-# ******************************************************************************* 
-#                                Pre-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Pre-install stage 
+	# ******************************************************************************* 
 
-# Common part of the pre-install stage
-if ! pre_install ; then
-	return 1
-fi
+	# Common part of the pre-install stage
+	if ! pre_install ; then
+		return 1
+	fi
 
 
-# ******************************************************************************* 
-#                                Para-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Para-install stage 
+	# ******************************************************************************* 
 
-# Show common message to let the operator focus on the critical part
-parainstall_msg
+	# Show common message to let the operator focus on the critical part
+	parainstall_msg
 
-# Ubuntu dependent message
-cat <<HEREDOC
+	# Ubuntu dependent message
+	cat <<- HEREDOC
 
-************************ CAUTION! CAUTION! CAUTION! ****************************
- 
-Make sure to click "Continue Testing",  at the end of the Ubiquity installer.
-Just exit the installer without rebooting.
+	************************ CAUTION! CAUTION! CAUTION! ****************************
+	
+	Make sure to click "Continue Testing",  at the end of the Ubiquity installer.
+	Just exit the installer without rebooting.
 
-Type return key to start Ubiquity.
-HEREDOC
+	Type return key to start Ubiquity.
+	HEREDOC
 
-# waitfor a console input
-read dummy_var
+	# waitfor a console input
+	read dummy_var
 
-# Start Ubiquity installer 
-ubiquity &
+	# Start Ubiquity installer 
+	ubiquity &
 
-# Record the PID of the installer. 
-installer_pid=$!
+	# Record the PID of the installer. 
+	installer_pid=$!
 
-# Common part of the para-install. 
-# Record the install PID, modify the /etc/default/grub of the target, 
-# and then, wait for the end of sintaller. 
-if ! parainstall ; then
-	return 1
-fi
+	# Common part of the para-install. 
+	# Record the install PID, modify the /etc/default/grub of the target, 
+	# and then, wait for the end of sintaller. 
+	if ! parainstall ; then
+		return 1
+	fi
 
-# ******************************************************************************* 
-#                                Post-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Post-install stage 
+	# ******************************************************************************* 
 
-## Mount the target file system
-# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
-echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
-mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
+	## Mount the target file system
+	# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
+	echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
+	mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
 
-# And mount other directories
-echo "...Mount all other dirs."
-for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
+	# And mount other directories
+	echo "...Mount all other dirs."
+	for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
 
-# Change root and create the keyfile and ramfs image for Linux kernel. 
-echo "...Chroot to ${TARGETMOUNTPOINT}."
-cat <<HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
-# Mount the rest of partitions by target /etc/fstab
-mount -a
+	# Change root and create the keyfile and ramfs image for Linux kernel. 
+	echo "...Chroot to ${TARGETMOUNTPOINT}."
+	cat <<- HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
+	# Mount the rest of partitions by target /etc/fstab
+	mount -a
 
-# Set up the kernel hook of encryption
-echo "...Install cryptsetup-initramfs package."
-apt -qq install -y cryptsetup-initramfs
+	# Set up the kernel hook of encryption
+	echo "...Install cryptsetup-initramfs package."
+	apt -qq install -y cryptsetup-initramfs
 
-# Prepare a key file to embed in to the ramfs.
-echo "...Prepair key file."
-mkdir /etc/luks
-dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
-chmod u=rx,go-rwx /etc/luks
-chmod u=r,go-rwx /etc/luks/boot_os.keyfile
+	# Prepare a key file to embed in to the ramfs.
+	echo "...Prepair key file."
+	mkdir /etc/luks
+	dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
+	chmod u=rx,go-rwx /etc/luks
+	chmod u=r,go-rwx /etc/luks/boot_os.keyfile
 
-# Add a key to the key file. Use the passphrase in the environment variable. 
-echo "...Add a key to the key file."
-printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
+	# Add a key to the key file. Use the passphrase in the environment variable. 
+	echo "...Add a key to the key file."
+	printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
 
-# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
-echo "...Add LUKS volume info to /etc/crypttab."
-echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
+	# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
+	echo "...Add LUKS volume info to /etc/crypttab."
+	echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
 
-# Putting key file into the ramfs initial image
-echo "...Register key file to the ramfs"
-echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
-echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf
+	# Putting key file into the ramfs initial image
+	echo "...Register key file to the ramfs"
+	echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
+	echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf
 
-# Finally, update the ramfs initial image with the key file. 
-echo "...Upadte initramfs."
-update-initramfs -uk all
+	# Finally, update the ramfs initial image with the key file. 
+	echo "...Upadte initramfs."
+	update-initramfs -uk all
 
-# Leave chroot
-HEREDOC
+	# Leave chroot
+	HEREDOC
 
-# Unmount all
-echo "...Unmount all."
-umount -R ${TARGETMOUNTPOINT}
+	# Unmount all
+	echo "...Unmount all."
+	umount -R ${TARGETMOUNTPOINT}
 
-# Finishing message
-cat <<HEREDOC
-****************** Post-install process finished ******************
+	# Finishing message
+	cat <<- HEREDOC
+	****************** Post-install process finished ******************
 
-...Ready to reboot.
-HEREDOC
+	...Ready to reboot.
+	HEREDOC
+
+	# Normal end
+	return 0
+}
+
+# Execute
+main
\ No newline at end of file
diff --git a/script/void-kaiten-yaki.sh b/script/void-kaiten-yaki.sh
index 5e2ac6b..483bcd7 100644
--- a/script/void-kaiten-yaki.sh
+++ b/script/void-kaiten-yaki.sh
@@ -1,175 +1,183 @@
 #!/bin/bash -u
 
-# Load configuration parameter
-source config.sh
+function main() {
+	# Load configuration parameter
+	source config.sh
 
-# Load functions
-source common/confirmation.sh
-source common/preinstall.sh
-source common/parainstall.sh
-source common/parainstall_msg.sh
+	# Load functions
+	source common/confirmation.sh
+	source common/preinstall.sh
+	source common/parainstall.sh
+	source common/parainstall_msg.sh
 
-# Varidate whether script is executed as sourced or not
-(return 0 2>/dev/null) && sourced=1 || sourced=0
-if [ $sourced -eq 0 ] ; then
-	cat <<HEREDOC 1>&2
-***** ERROR : Must execute as "sourced" *****
-Execute as following : 
-source void-kaiten-yaki.sh
+	# Varidate whether script is executed as sourced or not
+	(return 0 2>/dev/null) && sourced=1 || sourced=0
+	if [ $sourced -eq 0 ] ; then
+		cat <<- HEREDOC 1>&2
+	***** ERROR : Must execute as "sourced" *****
+	Execute as following : 
+	source void-kaiten-yaki.sh
 
-Installation terminated.
-HEREDOC
-	exit    # use "exit" instead of "return", if not "sourced" execusion
-fi # "sourced" validation
+	Installation terminated.
+	HEREDOC
+		exit    # use "exit" instead of "return", if not "sourced" execusion
+	fi # "sourced" validation
 
-# This is the mount point of the install target. 
-export TARGETMOUNTPOINT="/mnt/target"
-# 1 : Show message during GUI/TUI installer, 0 : Do not show.
-export PARAINSTMSG=0
+	# This is the mount point of the install target. 
+	export TARGETMOUNTPOINT="/mnt/target"
+	# 1 : Show message during GUI/TUI installer, 0 : Do not show.
+	export PARAINSTMSG=0
 
-# Distribution check
-if ! uname -a | grep void -i > /dev/null ; then	# "Void" is not found in the OS name.
-	echo "*********************************************************************************"
-	uname -a
-	cat <<HEREDOC 
-*********************************************************************************
-This system seems to be not Void Linux, while this script is dediated to the Void Linux.
-Are you sure you want to run this script for installation? [Y/N]
-HEREDOC
-	read YESNO
-	if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
-		cat <<HEREDOC 1>&2
+	# Distribution check
+	if ! uname -a | grep void -i > /dev/null ; then	# "Void" is not found in the OS name.
+		echo "*********************************************************************************"
+		uname -a
+		cat <<- HEREDOC 
+		*********************************************************************************
+		This system seems to be not Void Linux, while this script is dediated to the Void Linux.
+		Are you sure you want to run this script for installation? [Y/N]
+		HEREDOC
+		read YESNO
+		if [ ${YESNO} != "Y" -a ${YESNO} != "y" ] ; then
+			cat <<- HEREDOC 1>&2
 
-Installation terminated.
-HEREDOC
-		return
-	fi	# if YES
+			Installation terminated.
+			HEREDOC
+			return
+		fi	# if YES
 
-fi # "Void" is not found in the OS name.
+	fi # "Void" is not found in the OS name.
 
-# ******************************************************************************* 
-#                                Confirmation before installation 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Confirmation before installation 
+	# ******************************************************************************* 
 
-# Common part of the parameter confirmation
-if ! confirmation ; then
-	return 1
-fi
+	# Common part of the parameter confirmation
+	if ! confirmation ; then
+		return 1
+	fi
 
-# ******************************************************************************* 
-#                                Pre-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Pre-install stage 
+	# ******************************************************************************* 
 
-# Install essential packages.
-xbps-install -y -Su xbps gptfdisk
+	# Install essential packages.
+	xbps-install -y -Su xbps gptfdisk
 
 
-# Common part of the pre-install stage
-if ! pre_install ; then
-	return 1
-fi
+	# Common part of the pre-install stage
+	if ! pre_install ; then
+		return 1
+	fi
 
-# ADD "rd.auto=1 cryptdevice=/dev/sda2:${LUKS_NAME} root=/dev/mapper/${VGNAME}-${ROOTNAME}" to GRUB.
-# This is magical part. I have not understood why this is required. 
-# Anyway, without this modification, Void Linux doesn't boot. 
-# Refer https://wiki.voidlinux.org/Install_LVM_LUKS#Installation_using_void-installer
-echo "...Modify /etc/default/grub."
-sed -i "s#loglevel=4#loglevel=4 rd.auto=1 cryptdevice=/dev/sda2:${LUKS_NAME} root=/dev/mapper/${VGNAME}-${LVROOTNAME}#" /etc/default/grub
+	# ADD "rd.auto=1 cryptdevice=/dev/sda2:${LUKS_NAME} root=/dev/mapper/${VGNAME}-${ROOTNAME}" to GRUB.
+	# This is magical part. I have not understood why this is required. 
+	# Anyway, without this modification, Void Linux doesn't boot. 
+	# Refer https://wiki.voidlinux.org/Install_LVM_LUKS#Installation_using_void-installer
+	echo "...Modify /etc/default/grub."
+	sed -i "s#loglevel=4#loglevel=4 rd.auto=1 cryptdevice=/dev/sda2:${LUKS_NAME} root=/dev/mapper/${VGNAME}-${LVROOTNAME}#" /etc/default/grub
 
-# ******************************************************************************* 
-#                                Para-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Para-install stage 
+	# ******************************************************************************* 
 
-# Show common message to let the operator focus on the critical part
-parainstall_msg
-# Ubuntu dependent message
-cat <<HEREDOC
+	# Show common message to let the operator focus on the critical part
+	parainstall_msg
+	# Ubuntu dependent message
+	cat <<- HEREDOC
 
-************************ CAUTION! CAUTION! CAUTION! ****************************
- 
-Make sure to click "NO", if the void-installer ask you to reboot.
-Just exit the installer without rebooting.
+	************************ CAUTION! CAUTION! CAUTION! ****************************
+	
+	Make sure to click "NO", if the void-installer ask you to reboot.
+	Just exit the installer without rebooting.
 
-Type return key to start void-installer.
-HEREDOC
+	Type return key to start void-installer.
+	HEREDOC
 
-# waitfor a console input
-read dummy_var
+	# waitfor a console input
+	read dummy_var
 
-# Start void-installer 
-void-installer &
+	# Start void-installer 
+	void-installer &
 
 
-# Record the PID of the installer. 
-installer_pid=$!
+	# Record the PID of the installer. 
+	installer_pid=$!
 
-# Common part of the para-install. 
-# Record the install PID, modify the /etc/default/grub of the target, 
-# and then, wait for the end of sintaller. 
-if ! parainstall ; then
-	return 1
-fi
+	# Common part of the para-install. 
+	# Record the install PID, modify the /etc/default/grub of the target, 
+	# and then, wait for the end of sintaller. 
+	if ! parainstall ; then
+		return 1
+	fi
 
-# ******************************************************************************* 
-#                                Post-install stage 
-# ******************************************************************************* 
+	# ******************************************************************************* 
+	#                                Post-install stage 
+	# ******************************************************************************* 
 
-## Mount the target file system
-# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
-echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
-mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
+	## Mount the target file system
+	# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
+	echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
+	mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
 
-# And mount other directories
-echo "...Mount all other dirs."
-for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
+	# And mount other directories
+	echo "...Mount all other dirs."
+	for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
 
-# Change root and create the keyfile and ramfs image for Linux kernel. 
-echo "...Chroot to ${TARGETMOUNTPOINT}."
-cat <<HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
-# Mount the rest of partitions by target /etc/fstab
-mount -a
+	# Change root and create the keyfile and ramfs image for Linux kernel. 
+	echo "...Chroot to ${TARGETMOUNTPOINT}."
+	cat <<- HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
+	# Mount the rest of partitions by target /etc/fstab
+	mount -a
 
-# Set up the kernel hook of encryption
-echo "...Install cryptsetup-initramfs package."
-xbps-install -y lvm2 cryptsetup
+	# Set up the kernel hook of encryption
+	echo "...Install cryptsetup-initramfs package."
+	xbps-install -y lvm2 cryptsetup
 
-# Prepare a key file to embed in to the ramfs.
-echo "...Prepair key file."
-mkdir /etc/luks
-dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
-chmod u=rx,go-rwx /etc/luks
-chmod u=r,go-rwx /etc/luks/boot_os.keyfile
+	# Prepare a key file to embed in to the ramfs.
+	echo "...Prepair key file."
+	mkdir /etc/luks
+	dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
+	chmod u=rx,go-rwx /etc/luks
+	chmod u=r,go-rwx /etc/luks/boot_os.keyfile
 
-# Add a key to the key file. Use the passphrase in the environment variable. 
-echo "...Add a key to the key file."
-printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
+	# Add a key to the key file. Use the passphrase in the environment variable. 
+	echo "...Add a key to the key file."
+	printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
 
-# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
-echo "...Add LUKS volume info to /etc/crypttab."
-echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
+	# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
+	echo "...Add LUKS volume info to /etc/crypttab."
+	echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
 
-# Putting key file into the ramfs initial image
-echo "...Register key file to the ramfs"
-echo 'install_items+=" /etc/luks/boot_os.keyfile /etc/crypttab " ' > /etc/dracut.conf.d/10-crypt.conf
+	# Putting key file into the ramfs initial image
+	echo "...Register key file to the ramfs"
+	echo 'install_items+=" /etc/luks/boot_os.keyfile /etc/crypttab " ' > /etc/dracut.conf.d/10-crypt.conf
 
-# Finally, update the ramfs initial image with the key file. 
-echo "...Upadte initramfs."
-xbps-reconfigure -fa
-echo "...grub-mkconfig."
-grub-mkconfig -o /boot/grub/grub.cfg
-echo "...update-grub."
-update-grub
+	# Finally, update the ramfs initial image with the key file. 
+	echo "...Upadte initramfs."
+	xbps-reconfigure -fa
+	echo "...grub-mkconfig."
+	grub-mkconfig -o /boot/grub/grub.cfg
+	echo "...update-grub."
+	update-grub
 
-# Leave chroot
-HEREDOC
+	# Leave chroot
+	HEREDOC
 
-# Unmount all
-echo "...Unmount all."
-umount -R ${TARGETMOUNTPOINT}
+	# Unmount all
+	echo "...Unmount all."
+	umount -R ${TARGETMOUNTPOINT}
 
-# Finishing message
-cat <<HEREDOC
-****************** Post-install process finished ******************
+	# Finishing message
+	cat <<- HEREDOC
+	****************** Post-install process finished ******************
 
-...Ready to reboot.
-HEREDOC
+	...Ready to reboot.
+	HEREDOC
+
+	# Normal end
+	return 0
+}
+
+# Execute
+main
\ No newline at end of file