install_sys.sh

#!/bin/bash

# Never run pacman -Sy on your system!
pacman -Sy dialog --noconfirm

timedatectl set-ntp true

# Welcome message of type yesno - see `man dialog`
dialog --defaultno --title "Are you sure?" --yesno \
"This is my personnal arch linux install. \n\n\
It will just DESTROY EVERYTHING on the hard disk of your choice. \n\n\
Don't say YES if you are not sure about what you're doing! \n\n\
Are you sure?" 15 60 || exit

dialog --no-cancel --inputbox "Enter a name for your computer." \
    10 60 2> comp

comp=$(cat comp) && rm comp

# Verify boot (UEFI or BIOS)
uefi=0
ls /sys/firmware/efi/efivars 2> /dev/null && uefi=1

# Choosing the hard drive
devices_list=($(lsblk -d | awk '{print "/dev/" $1 " " $4 " on"}' \
    | grep -E 'sd|hd|vd|nvme|mmcblk'))

dialog --title "Choose your hard drive" --no-cancel --radiolist \
"Where do you want to install your new system? \n\n\
Select with SPACE, valid with ENTER. \n\n\
WARNING: Everything will be DESTROYED on the hard disk!" \
15 60 4 "${devices_list[@]}" 2> hd

hd=$(cat hd) && rm hd

# Ask for the size of the swap partition
default_size="8"
dialog --no-cancel --inputbox \
"You need four partitions: Boot, Root and Swap \n\
The boot partition will be 512M \n\
The root partition will be the remaining of the hard disk \n\n\
Enter below the partition size (in Gb) for the Swap. \n\n\
If you don't enter anything, it will default to ${default_size}G. \n" \
20 60 2> swap_size

size=$(cat swap_size) && rm swap_size

[[ $size =~ ^[0-9]+$ ]] || size=$default_size

dialog --no-cancel \
--title "!!! DELETE EVERYTHING !!!" \
--menu "Choose the way you'll wipe your hard disk ($hd)" \
15 60 4 \
1 "Use dd (wipe all disk)" \
2 "Use schred (slow & secure)" \
3 "No need - my hard disk is empty" 2> eraser

hderaser=$(cat eraser); rm eraser

# This function can wipe out a hard disk.
# DO NOT RUN THIS FUNCTION ON YOUR ACTUAL SYSTEM!
# If you did it, DO NOT CALL IT!!
# If you did it, I'm sorry.
function eraseDisk() {
    case $1 in
        1) dd if=/dev/zero of="$hd" status=progress 2>&1 \
            | dialog \
            --title "Formatting $hd..." \
            --progressbox --stdout 20 60;;
        2) shred -v "$hd" \
            | dialog \
            --title "Formatting $hd..." \
            --progressbox --stdout 20 60;;
        3) ;;
    esac
}

eraseDisk "$hderaser"

boot_partition_type=1
[[ "$uefi" == 0 ]] && boot_partition_type=4

# Create the partitions

#g - create non empty GPT partition table
#n - create new partition
#p - primary partition
#e - extended partition
#w - write the table to disk and exit

partprobe "$hd"

fdisk "$hd" << EOF
g
n


+512M
t
$boot_partition_type
n


+${size}G
n



w
EOF

partprobe "$hd"

# Format the partitions

mkswap "${hd}2"
swapon "${hd}2"
mkfs.ext4 "${hd}3"
mount "${hd}3" /mnt

if [ "$uefi" = 1 ]; then
    mkfs.fat -F32 "${hd}1"
    mkdir -p /mnt/boot/efi
    mount "${hd}1" /mnt/boot/efi
fi

# Install Arch Linux! Glory and fortune!
pacstrap /mnt base base-devel linux linux-firmware
genfstab -U /mnt >> /mnt/etc/fstab

# Persist important values for the next script
echo "$uefi" > /mnt/var_uefi
echo "$hd" > /mnt/var_hd
mv comp /mnt/comp

# Download install_chroot.sh
curl https://raw.githubusercontent.com/ajkingio/arch_installer/main/install_chroot.sh > /mnt/install_chroot.sh

arch-chroot /mnt bash install_chroot.sh

rm /mnt/var_uefi
rm /mnt/var_hd
rm /mnt/install_chroot.sh
rm /mnt/comp

dialog --title "To reboot or not to reboot?" --yesno \
"Congrats! The install is done! \n\n\
Do you want to reboot your computer?" 20 60

response=$?

case $response in
    0) reboot;;
    1) clear;;
esac