arch_install.sh

#!/bin/bash

################################################################################
###  Variables                                                               ###
################################################################################
TARGET_DRIVER="/dev/sda"
SWAP="FALSE"  

################################################################################
###  Functions                                                               ###
################################################################################
helpFunction() {
   echo ""
   echo "Usage: $0 [options...]"
   echo -e " --mbr \tSet the boot configuration to use MBR/Legacy"
   echo -e " --uefi \tSet the boot configuration to use UEFI"
   echo -e " --swap \tSet swap as a partition instead of file(default)"
   echo -e " --about \tAbout this script"
   echo -e " -v, --version \tShows the Script version"
   echo -e " -h, --help \tThis help"
   exit 1 # Exit script after printing help
}

################################################################################
###  Arguments parser                                                        ###
################################################################################
if [[ $# == 0 ]]; then
  echo -e "You should pass the required arguments"
  helpFunction
  exit 1
fi

while [[ $# -gt 0 ]]; do
  case "$1" in
    --uefi*)
      UEFI="TRUE"
      if [[ $MBR == "TRUE" ]]; then
        echo -e "You should choosse only one boot configuration: MBR or UEFI"
        exit 1
      fi
      # echo "UEFI: $UEFI"
      ;;
    --mbr*)
      MBR="TRUE"
      if [[ $UEFI == "TRUE" ]]; then
        echo -e "You should choosse only one boot configuration: MBR or UEFI"
        exit 1
      fi
      # echo "MBR: $MBR"
      ;;
    --swap*)
      SWAP="TRUE"
      ;;
    --help|-h*)
      helpFunction
      exit 0
      ;;
    *)
      >&2 printf "Error: Invalid argument\n"
      exit 1
      ;;
  esac
  shift
done

################################################################################
###  Partitioning                                                            ###
################################################################################

# to create the partitions programatically (rather than manually)
# we're going to simulate the manual input to fdisk
# The sed script strips off all the comments so that we can 
# document what we're doing in-line with the actual commands
# Note that a blank line (commented as "defualt" will send a empty
# line terminated with a newline to take the fdisk default.

(
if [[ $MBR == "TRUE" ]]; then
  echo o # Create a new empty DOS partition table
  echo n # Add a new partition
  echo p # Primary partition
  echo   # Partition number (Accept default: 1)
  echo   # default, start immediately after preceding partition
  echo   # default, extend partition to end of disk
  echo a # make a partition bootable
elif [[ $UEFI == "TRUE" ]]; then
  echo g #Create a new empty GPT partition table
  echo n # Add a new partition
  echo p # Primary partition
  echo 1 # Partition number 1
  echo   # First sector (Accept default: 1) - start at beginning of disk 
  echo +512M # 512 MB boot parttion
  echo n # Add a new partition
  echo p # Primary partition
  echo 2 # Partition number 2
  echo   # default, start immediately after preceding partition
  echo   # default, extend partition to end of disk
  echo a # make a partition bootable
  echo 1 # bootable partition is partition 1 -- /dev/sda1
fi
echo p # print the in-memory partition table
echo w # Write changes
# echo q # We're done
) | sudo fdisk ${TARGET_DRIVER}

sleep 5
################################################################################
###  Partition formatting                                                    ###
################################################################################
if [[ $MBR == "TRUE" ]]; then
  # Make EXT4 Filesystem on /dev/sda1
  mkfs.ext4 /dev/sda1 
elif [[ $UEFI == "TRUE" ]]; then
  # Make FAT32 Filesystem on /dev/sda1 (bootable)
  mkfs.fat -F32 /dev/sda1
  
  # Make EXT4 Filesystem on /dev/sda2
  mkfs.ext4 /dev/sda2 
fi

if [[ $SWAP == "TRUE" ]]; then
  # Make Swap on /dev/sda4
  mkswap /dev/sda4 
fi

sleep 5
################################################################################
###  Partition mounting                                                      ###
################################################################################
if [[ $MBR == "TRUE" ]]; then
  mount /dev/sda1 /mnt
elif [[ $UEFI == "TRUE" ]]; then
  mkdir /mnt/boot
  mkdir /mnt/boot/efi 
  mount /dev/sda1 /mnt/boot/efi
  mount /dev/sda2 /mnt
fi

if [[ $HOME == "TRUE" ]]; then
  mkdir /mnt/home
  mount /dev/sda3 /mnt/home
fi

if [[ $SWAP == "TRUE" ]]; then
  swapon /dev/sda4
fi

sleep 5
################################################################################
###  System installing                                                       ###
################################################################################
pacstrap /mnt base linux linux-firmware

sleep 5

genfstab -U -p /mnt >> /mnt/etc/fstab

sleep 5

arch-chroot /mnt

sleep 5

ln -sf /usr/share/zoneinfo/America/Sao_Paulo /etc/localtime