Install Arch Linux with full encrypted btrfs subvolume inside luks

install-arch-linux-on-btrfs-subvolume-inside-luks

# Install Arch Linux with full encrypted btrfs subvolume inside luks
# Hardware: BIOS system, Intel GPU, Nvidia Optimus, Toshiba SSD, Wifi
# Please adjust for your needs.
# filename: install-arch-linux-on-btrfs-subvolume-inside-luks.txt
# The official guide: https://wiki.archlinux.org/index.php/Installation_Guide

# Download the archiso image from https://www.archlinux.org/download/
# Copy to a usb-drive
dd bs=4M if=archlinux.iso of=/dev/sdx status=progress oflag=sync # on linux

# Boot from the usb.

# Set your keymap
loadkeys es

# Connect to Internet:
# Ethernet - plug in the cable
# WLAN - use iwctl utility
# WWAN - use mmcli utility

# Connect to WLAN using wlan0:
iwctl
[iwd]# station wlan0 connect SSID
# enter the passphras
# or directly connect from zsh:
iwctl --passphrase passphrase station wlan0 connect SSID

# Check connection:
ping archilinux.org

# Create a primary partition - entire disk
parted -s /dev/sda mklabel msdos
parted -s /dev/sda mkpart primary 2048s 100%

# Create luks container (luks1 for compatibility with grub)
cryptsetup --type luks1 --cipher aes-xts-plain64 --hash sha512 \
           --use-random --verify-passphrase luksFormat /dev/sda1

# Create btrfs filesystem
cryptsetup open /dev/sda1 archlinux
mkfs.btrfs --force --label archlinux -n 32k /dev/mapper/archlinux

# ... and subvolumes
mount -t btrfs -o compress=lzo /dev/mapper/archlinux /mnt
btrfs subvolume create /mnt/@
btrfs subvolume create /mnt/@home
btrfs subvolume create /mnt/@snapshots

# Unmount and remount with the corect partitions
umount /mnt

# Mount options
o=defaults,x-mount.mkdir
o_btrfs=$o,compress=zstd,ssd,noatime,nodiratime,space_cache

# Remount the partitions
mount -o compress=lzo,subvol=@,$o_btrfs /dev/mapper/archlinux /mnt
mount -o compress=lzo,subvol=@home,$o_btrfs /dev/mapper/archlinux /mnt/home
mount -o compress=lzo,subvol=@snapshots,$o_btrfs /dev/mapper/archlinux /mnt/.snapshots

# Install the system, wifi and some tools
pacstrap /mnt base base-devel btrfs-progs snapper zsh mlocate htop \
                net-tools wireless_tools wpa_supplicant dialog vim \
                intel-ucode grub aria2 hping elinks bash-completion

# Generate fstab
genfstab -L -p /mnt >> /mnt/etc/fstab

# Enter the new system
arch-chroot /mnt /bin/bash

# Setup system clock
ln -s /usr/share/zoneinfo/Europe/Madrid /etc/localtime
hwclock --systohc --utc

# Set the hostname
echo arch > /etc/hostname

# Generate and set default locale
vim /etc/locale.gen
# Uncomment en_US.UTF-8
locale-gen
echo LANG=en_US.utf8 >> /etc/locale.conf
echo LANGUAGE=en_US >> /etc/locale.conf
echo LC_ALL=C >> /etc/locale.conf

# Set virtul console lang and font
echo KEYMAP=es > /etc/vconsole.conf
echo FONT=Lat2-Terminus16 >> /etc/vconsole.conf

# Set password for root
passwd

# Create user
useradd -m -G wheel angel
passwd angel

# Configure mkinitcpio
vim /etc/mkinitcpio.conf

# Early modules load
MODULES=(atkbd intel_agp i915)
# Embed btrfs to initramfs
BINARIES=(/usr/sbin/btrfs)
# Add 'encrypt' to HOOKS before filesystems
HOOKS="base udev autodetect modconf block encrypt filesystems keyboard fsck"

# Regenerate initrd image
mkinitcpio -p linux

# Setup grub
# Edit /etc/default/grub, add GRUB_ENABLE_CRYPTODISK=y and GRUB_DISABLE_SUBMENU=y
GRUB_CMDLINE_LINUX="cryptdevice=/dev/sda1:archlinux:allow-discards"

# Extra kernel options to add to GRUB_CMDLINE_LINUX (for old laptop 2011-2012)
# https://forum.manjaro.org/t/howto-power-savings-setup-20180906/1445
# ACPI
acpi_osi=Linux acpi_osi='!Windows 2012' acpi=force acpi_enforce_resources=lax
# i915
i915.modeset=1 i915.fastboot=1 i915.enable_rc6=1 i915.enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1 
# Varios power saving and performance settings
net.ifnames=0 spectre_v2=off nopti nowatchdog vsyscall=emulate ath9k.ps_enable=1 pcie_aspm=force ipv6.disable=1
# Audit
audit=1 audit_backlog_limit=8192
# Quite boot
quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3

# My actual CMDLINE for ThinkPad T480s
BOOT_IMAGE=/vmlinuz-linux-zen root=/dev/mapper/archlinux rw rootflags=subvol=root \
cryptdevice=/dev/nvme0n1p4:archlinux:allow-discards rd.luks.options=discards rw \
acpi_osi=! "acpi_osi=Windows 2018" acpi=force acpi_enforce_resources=lax drm.vblankoffdelay=1 acpi_backlight=native \
i915.modeset=1 i915.fastboot=1 i915.enable_psr=1 i915.enable_guc=3 i915.enable_fbc=1 \
net.ifnames=0 spectre_v2=off nopti nowatchdog vsyscall=emulate audit=1 audit_backlog_limit=8192 \
fan_control=1 psmouse.elantech_smbus=0 ec_sys.write_support=1 \
quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3

# Install grub and create configuration
grub-install --target=i386-pc /dev/sda
grub-mkconfig -o /boot/grub/grub.cfg

# Exit new system and go into the cd shell
exit

# Unmount all partitions
umount -R /mnt

# Reboot into the new system, don't forget to remove the usb
reboot

# Create keyfile for paswordless login
dd bs=512 count=4 if=/dev/urandom of=/crypto_keyfile.bin
cryptsetup luksAddKey /dev/sda1 /crypto_keyfile.bin
and add to /etc/mkinitcpio.conf
FILES=(/crypto_keyfile.bin)
# run:
mkinitcpio -p linux
# Reboot again, you’ll only need to enter your password once.
reboot

# Secure keyfile and /boot
chmod 000 /crypto_keyfile.bin  # actually, even root doesn't need to access this
chmod -R g-rwx,o-rwx /boot     # just to be safe

# Optional: Install Aur helper, X, WM, Software and Configure the System

# Install AUR helper - yaourt
wget https://aur.archlinux.org/cgit/aur.git/snapshot/package-query.tar.gz
wget https://aur.archlinux.org/cgit/aur.git/snapshot/yaourt.tar.gz
# Install as regular user (extract, run makepkg, pacman -U)

::TODO:: Update the installed packages. Finish configuration.

# Install Zen Kernel , X, DE, some basic tools
pacman -S linux-zen linux-zen-headers irqbalance cpupower x86_energy_perf_policy \
pacman -S xorg-server xf86-video-intel xf86-video-nouveau xf86-input-synaptics \
            xorg-xbacklight xorg-xinit xterm rxvt-unicode compton openbox tint2 \
            conky  dmenu  volumeicon slock feh nitrogen scrot xarchiver p7zip \
            unzip unrar rfkill ttf-liberation ttf-droid ttf-hack terminus-font \
            powertop wget whois ethtool archey3 gvim

# Look and feel
pacman -S gtk-engine-murrine numix-themes faenza-icon-theme

# Office programs

# Some graphics applications
pacman -S gimp inkscape dia mtpaint gpicview graphicsmagick cups-pdf simple-scan

# Utilities
pacman -S stardict-lite aspell-en aspell-es hunspell-en hunspell-es \
            mythes-en mythes-es hyphen-en hyphen-es perl-file-mimeinfo \
            keepassx cherrytree zim gprename galculator gsimplecal

# System tools
pacman -S bleachbit nethogs gparted dosfstools ntfs-3g grsync gsmartcontrol \
            lxterminal lxappearance lxtask obconf geany scite sshfs gpart \
            nmap macchanger ghex yajl pssh wpa_actiond ifplugd gvfs dnsutils\
            ifplugd gvfs dnsutils grsync xdotool alsa-plugins alsa-utils lsof

# Multimedia
pacman -S avidemux-gtk audacity guvcview gtk-recordmydesktop pragha winff \
            handbrake mpv easytag smplayer deadbeef gst-plugins-bad \
            gst-plugins-ugly gst-libav openshot libquicktime \
            frei0r-plugins flashplayer youtube-dl rtmpdump atomicparsley

# Network
pacman -S pidgin pidgin-otr purple-skypeweb linphone xchat transmission-gtk \
            uget filezilla claws-mail opera wireshark-gtk openvpn pptpclient \
            xl2tpd torsocks

# Virtualisation
pacman -S virtualbox virtualbox-host-dkms wine winetricks

# Nvidia Optimus
pacman -S --needed bumblebee primus bbswitch-dkms libva-intel-driver \
            libva-mesa-driver  libva-vdpau-driver mesa-vdpau nvidia-dkms \
            nvidia-utils nvidia-settings mesa-demos

# Development
pacman -S nginx-mainline php php-apcu php-fpm php-gd php-mcrypt php-snmp \
            php-tidy composer apache nghttp2 lighttpd openvpn \
            mariadb xdebug nodejs ruby npm colordiff git jdk8-openjdk

# Security
pacman -S rkhunter clamav gufw

yaourt -S   ananicy-git cdw csslint dbeaver freeplane freshplayerplugin  gtk-theme-numix-sx icecat-bin \
            lostfiles nodejs-jshint pepper-flash playerctl profile-cleaner purple-facebook purple-hangouts-hg \
            virtualbox-ext-oracle clipit spacefm-git scite sublime-text-dev megasync thermald genymotion

You are right - it's not necessary... or better say, we are both right - one need to add cryptkey in case the key is not named crypto_keyfile.bin. From Arch Wiki dm-crypt Device Encryption page:

The encrypt hook lets the user specify a keyfile with the cryptkey kernel parameter: in the case of initramfs, the syntax is rootfs:path. See dm-crypt/System configuration#cryptkey. Besides, this kernel parameter defaults to use /crypto_keyfile.bin, and if the initramfs contains a valid key with this name, decryption will occur automatically without the need to configure the cryptkey parameter.

In my case, I've named it differently (just following some steps from some other guide I found), so I needed the cryptkey argument included.

Sorry for bothering you, I've just started with diving deeper into Arch Linux and there is so many information that I just overlooked this one. Anyway, thanks for sharing your script, it gave me few good pointers!