An old Arch to Artix conversion script that might be of use to someone

arch2artix.sh

#!/bin/bash

# LICENSE: MIT

#TODO:
# - need to check and make sure this script is up to date with the migration process [ ]
# - the script doesn't seem to work when I have been testing it. it does most of the stuff
# 	properly, however it doesn't seem to get the install *quite* right. I need to do
#	much, much more testing before I can properly use this

#run this script as root

#also checkout the new migration article on artix's website, they added in init specific documentation
#url=https://wiki.artixlinux.org/Main/Migration

artix_mirrorlist="https://gitea.artixlinux.org/artixlinux/packages/raw/branch/master/artix-mirrorlist/trunk/mirrorlist"
artix_pacman_conf="https://gitea.artixlinux.org/artixlinux/packages/raw/branch/master/pacman/trunk/pacman.conf"
arch_pacman_conf_backup="/etc/pacman-conf-backup"
arch_mirrorlist_backup="/etc/pacman.d/mirrorlist-backup"
cache_dir="$HOME/.cache"
init="openrc" #runit, s6, or openrc
disk="/dev/sda"

die(){
	printf "$1 Exiting...\n"
	exit 1
}

give_warning(){
	echo "This script can cause potentially unwanted changes to your arch based system.
Please inspect this script yourself before running it!!!
Now's your last chance to turn back!\n"
	printf "Continue with conversion? (y/n):"
	read -r answer
	answer=$(printf $answer | tr [:upper:] [:lower:]) # clean up answer
	[ "$answer" = "y" ] && return 0 || return 1 # 0 if yes, 1 if no
}

# no root needed
backup(){
	# if backup files dont exist, create them
	[ -f ${arch_pacman_conf_backup}  ] || cp /etc/pacman.conf "$arch_pacman_conf_backup" && echo "Copied /etc/pacman.conf to ${arch_pacman_conf_backup}"
	[ -f ${arch_mirrorlist_backup} ] || cp /etc/pacman.d/mirrorlist "$arch_mirrorlist_backup" && echo "Copied /etc/pacman.d/mirrorlist to ${arch_mirrorlist_backup}"
}

# no root needed
fetch_artix_files(){
	[ -d $cache_dir ] || mkdir -p $cache_dir
	cd $cache_dir
	curl -LO "$artix_mirrorlist"
	curl -LO "$artix_pacman_conf"
}

# root needed
move_arch_mirrors(){
	mv /etc/pacman.d/mirrorlist /etc/pacman.d/mirrorlist-arch
}

# root needed
move_artix_files_to_place(){
	cp -f "$cache_dir/pacman.conf" /etc/pacman.conf
	cp -f "$cache_dir/mirrorlist" /etc/pacman.d/mirrorlist
}

# root needed
remove_pacman_cache(){
	pacman -Scc && pacman -Syy
}

remove_sig_req(){
	# improve regex
	sed -i 's/Required DatabaseOptional/Never/' /etc/pacman.conf
}

install_artix_key(){
	pacman -S artix-keyring
	pacman-key --populate artix
	pacman-key --lsign-key 95AEC5D0C1E294FC9F82B253573A673A53C01BC2
}

restore_sig_req(){
	# improve regex
	sed -i 's/Never/Required DatabaseOptional/' /etc/pacman.conf
}

backup_daemons(){
	systemctl list-units --state=running |
		grep -v systemd |
		awk '{print $1}' |
		grep service > daemon.list
}

down_artix_pkgs(){
	pacman -Sw --noconfirm base \
		base-devel \
		${init}-system \
		grub \
		linux \
		linux-headers \
		elogind-${init} \
		${init} \
		netifrc \
		grub \
		mkinitcpio \
		archlinux-mirrorlist \
		net-tools \
		rsync \
		nano \
		lsb-release \
		opensysusers \
		opentmpfiles
}

rem_sysd(){
	pacman -Rdd --noconfirm systemd systemd-libs systemd-sysvcompat pacman-mirrorlist dbus
	rm -fv /etc/resolv.conf

	# restore artix mirrorlist
	cp -vf /etc/pacman.d/mirrorlist.pacsave /etc/pacman.d/mirrorlist
}

install_artix_pkgs(){
	pacman -S --needed --noconfirm base \
		base-devel \
		${init}-system \
		grub \
		linux \
		linux-headers \
		elogind-${init} \
		${init} \
		netifrc \
		grub \
		mkinitcpio \
		archlinux-mirrorlist \
		net-tools \
		rsync \
		nano \
		lsb-release \
		opensysusers \
		opentmpfiles
}

reinstall_pkgs(){
	 pacman -Sl system | grep installed | cut -d" " -f2 | pacman -S -
	 pacman -Sl world | grep installed | cut -d" " -f2 | pacman -S -
	 pacman -Sl galaxy | grep installed | cut -d" " -f2 | pacman -S -
}

# use the backed up init services
#install_init_scripts(){
enable_init_scripts(){
	echo "Enabling Init scripts..."
	if [ $init = openrc ]
	then
		for daemon in acpid alsasound autofs cronie cupsd xdm fuse haveged hdparm smb sshd syslog-ng; do rc-update add $daemon default; done
		rc-update add udev sysinit
	elif [ $init = runit ]
	then
		 for daemon in acpid alsasound autofs cronie cupsd dbus elogind xdm fuse haveged hdparm smb sshd syslog-ng; do ln -s /etc/runit/sv/$daemon /etc/runit/runsvdir/default; done
	 elif [ $init = s6 ]
	 then
		  s6-rc-bundle -c /etc/s6/rc/compiled add default acpid alsasound autofs cronie cupsd elogind xdm fuse haveged hdparm smb sshd syslog-ng
	fi
}

conf_networking(){
	echo "Configuring Networking..."
	echo "8.8.8.8" > /etc/resolv.conf
}

lvm_enable(){
	if [ $init = openrc ]
	then
		rc-update add lvm boot
		rc-update add device-mapper boot
	elif [ $init = runit ]
	then
		ln -s /etc/runit/sv/lvm2 /etc/runit/runsvdir/default
		ln -s /etc/runit/sv/device-mapper /etc/runit/runsvdir/default
	elif [ $init = s6 ]
	then
		s6-rc-bundle-update add default lvm2
		s6-rc-bundle-update add default device-mapper
	fi

}

remove_sysd_cruft(){
	 for user in systemd-journal systemd-journal-gateway systemd-timesync systemd-network systemd-bus-proxy systemd-journal-remote systemd-journal-upload
	 do userdel $user
	 done
	 rm -vfr /{etc,var/lib}/systemd
}

update_bootloader_initramfs(){
	cp /etc/mkinitcpio.pacnew /etc/mkinitcpio
	cp /etc/default/grub.pacnew /etc/default/grub
	# merge any changes in mkinitcpio.conf to new one
	mkinitcpio -P
	update-grub
}

reinstall_grub(){
	#check if uefi or bios system
	# potentially change the efi-directory=...
	grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub
	grub-install $disk
	# bios
	#grub-install $disk		#/dev/sd
}

reboot_directions(){
echo "Enter these commands to reboot:
sync
umount -a
mount -f / -o remount,ro
echo s >| /proc/sysrq-trigger
echo u >| /proc/sysrq-trigger
echo b >| /proc/sysrq-trigger
"
}

main(){
	[ $(whoami) = root ] || die "You need to be root!"
	give_warning || die "Conversion Cancelled."
	backup
	fetch_artix_files
	move_arch_mirrors
	move_artix_files_to_place

	remove_pacman_cache
	remove_sig_req
	install_artix_key
	restore_sig_req

	backup_daemons

	down_artix_pkgs
	rem_sysd
	install_artix_pkgs
	reinstall_pkgs

	enable_init_scripts
	lvm_enable
	remove_sysd_cruft

	update_bootloader_initramfs
	reinstall_grub
	reboot_directions
}

#main