part1.sh

#!/bin/bash

#check network connection
con=$(ping -q -w 1 -c 1 `ip r | grep default | cut -d ' ' -f 3` > /dev/null && echo ok || echo error)
if [ $con == "error" ]; then
    exit -1
fi

timedatectl set-ntp true
lsblk
dest_disk=""
while [[ ! $dest_disk =~ ^sd[a-z]$ ]]; do # while $dest_disk != ^sd?$
    read -p "Please select the disk you want to install ArchLinux [sda,sdb...]" dest_disk
done
cgdisk /dev/$dest_disk

# function part_init {
#     local __flag=""
#     read -p "Have $1? [y/n]" __flag
#     if [ $__flag == "y" ]; then
#         local __part_flag=""
#         while [[ ! $__part_flag =~ ^sd[a-z][0-9]$ ]]; do
#             read -p "Please provide $1 partition [sda1/sdb2...]" __part_flag
#         done
#         echo $__part_flag
#     else
#         echo ""
#     fi
# }

# eg fmt_part sda1 swap
# eg2 fmt_part sda2 / btrfs
function fmt_part {
    #syntax checked in main
    local __part=$1
    
    # won't check mnt pt syntax
    if [ $2=="swap" ]; then
        mkswap /dev/$__part
        swapon /dev/$__part
    else
        mkfs.$3 /dev/$__part
    fi
}

#hash table of mount_point-partition
declare -A mnt_part_table

#format partition
fin_part=()
choice=""
fs_list=$(ls /bin|grep '^mkfs.'|cut -d '.' -f 2)
mnt_list=("/boot","swap","/","/home")

while [ $choice!="y" ] || [ $choice!="Y" ]; do
    lsblk
    local __part=""
    while [[ ! $__part =~ ^sd[a-z][0-9]$ ]]; do
        read -p "Please choose the partition [sda1,sdb2...]" __part
    done
    local __mnt=""
    read -p "What is the mount point? [${mnt_list[*]}]" __mnt
    local __fs=""
    read -p "What is the file system of /dev/$__part? [${fs_list[*]}]" __fs
    fmt_part $__part $__mnt $__fs
    fin_part+=($__part)
    mnt_part_table+=(["$__mnt"]="$__part")
    echo "Finished parts: ${fin_part[*]}"
done

# mount: root -> boot -> home
mount /dev/${mnt_part_table["/"]} /mnt
mkdir /mnt/boot
mkdir /mnt/home
mount /dev/${mnt_part_table["/boot"]} /mnt/boot
mount /dev/${mnt_part_table["/home"]} /mnt/home

#sort the mirrorlist according to their speed first
rankmirrors -g
pacstrap /mnt base base-devel

genfstab -U /mnt >> /mnt/etc/fstab
cp part2.sh /mnt/part2.sh
arch-chroot /mnt