404 lines
14 KiB
Bash
Executable File
404 lines
14 KiB
Bash
Executable File
#!/usr/bin/env bash
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# arch-autoinstall.sh — automated Arch Linux base installer
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#
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# If /answerfile.json exists (e.g. embedded in the ISO via build.sh --preconf),
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# all prompts are answered from it. Missing fields fall back to interactive prompts.
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#
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# Answerfile fields: drive, kernel, hostname, username, encrypt, fido2_root,
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# fido2_user, run_tui (password always prompted interactively)
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set -euo pipefail
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############################################
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# LOGGING
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############################################
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LOGFILE="$HOME/arch-autoinstall.log"
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{
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echo
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echo "############################################"
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echo " Arch Auto-Install Log - Started $(date)"
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echo "############################################"
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echo
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} >> "$LOGFILE"
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exec > >(tee -a "$LOGFILE") 2>&1
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############################################
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# ANSWERFILE
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############################################
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ANSWERFILE="${ANSWERFILE:-/answerfile.json}"
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AF_MODE=false
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[[ -f "$ANSWERFILE" ]] && AF_MODE=true
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af_get() {
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# af_get <jq-filter> [default]
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local val
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val=$(jq -r "${1} // empty" "$ANSWERFILE" 2>/dev/null || true)
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if [[ -z "$val" ]]; then printf '%s' "${2:-}"; else printf '%s' "$val"; fi
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}
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af_bool() {
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# Returns YES or NO from a JSON boolean field
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local val; val=$(jq -r "${1} // false" "$ANSWERFILE" 2>/dev/null || true)
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[[ "$val" == "true" ]] && echo "YES" || echo "NO"
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}
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get_mac_suffix() {
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local mac
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mac=$(ip link show 2>/dev/null \
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| awk '/^[0-9]+: [^l][^o]/{iface=1} iface && /link\/ether/{print $2; iface=0; exit}')
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printf '%s' "${mac//:/}"
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}
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if $AF_MODE; then
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echo "Answerfile detected: $ANSWERFILE"
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# Ensure jq is available
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command -v jq &>/dev/null || pacman -Sy --noconfirm jq
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fi
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############################################
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# SAFETY WARNING
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############################################
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if $AF_MODE; then
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echo "WARNING: Automated install — all data on $(af_get '.drive' '/dev/?') will be ERASED."
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echo "Proceeding in 5 seconds... (Ctrl-C to abort)"
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sleep 5
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else
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echo "WARNING: This will ERASE ALL DATA on the selected drive!"
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read -rp "Type 'YES' to continue: " confirm
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[[ "$confirm" == "YES" ]] || { echo "Aborted."; exit 1; }
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fi
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############################################
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# REQUIRED PACKAGES FOR INSTALL ENVIRONMENT
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############################################
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pacman -Sy --noconfirm parted cryptsetup libfido2 pam-u2f
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############################################
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# DRIVE SELECTION
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############################################
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lsblk
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if $AF_MODE && [[ -n "$(af_get '.drive')" ]]; then
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DRIVE=$(af_get '.drive')
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echo "Drive (from answerfile): $DRIVE"
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else
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read -rp "Enter target drive (e.g., /dev/sda): " DRIVE
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fi
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############################################
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# USER INPUT
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############################################
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if $AF_MODE; then
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KERNEL=$(af_get '.kernel' 'linux')
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RAW_HOSTNAME=$(af_get '.hostname' '')
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if [[ -n "$RAW_HOSTNAME" ]]; then
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HOSTNAME="${RAW_HOSTNAME}-$(get_mac_suffix)"
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else
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HOSTNAME="arch"
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fi
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USERNAME=$(af_get '.username' '')
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ENCRYPT_DISK=$(af_bool '.encrypt')
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FIDO_ROOT=$(af_bool '.fido2_root')
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FIDO_USER=$(af_bool '.fido2_user')
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RUN_TUI=$(af_bool '.run_tui')
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echo "Kernel: $KERNEL"
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echo "Hostname: $HOSTNAME"
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echo "Username: $USERNAME"
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echo "Encrypt: $ENCRYPT_DISK / FIDO2 root: $FIDO_ROOT / FIDO2 user: $FIDO_USER"
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else
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read -rp "Enter kernel package (e.g., linux, linux-lts): " KERNEL
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read -rp "Enter hostname: " HOSTNAME
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read -rp "Enter username: " USERNAME
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read -rp "Enable disk encryption? (YES/NO): " ENCRYPT_DISK
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FIDO_ROOT="NO"
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if [[ "$ENCRYPT_DISK" == "YES" ]]; then
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read -rp "Enable FIDO2 unlocking for root partition? (YES/NO): " FIDO_ROOT
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fi
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read -rp "Enable FIDO2 authentication for user login? (YES/NO): " FIDO_USER
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fi
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# Password always prompted — never stored in answerfile
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read -rsp "Enter password for $USERNAME: " USERPASS; echo
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[[ -z "$USERPASS" ]] && { echo "Error: password cannot be empty."; exit 1; }
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if ! $AF_MODE; then
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read -rp "Run dotfiles TUI setup inside chroot now? [YES/no]: " _RUN_TUI_IN
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_RUN_TUI_IN="${_RUN_TUI_IN:-YES}"
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[[ "${_RUN_TUI_IN^^}" == "YES" ]] && RUN_TUI="YES" || RUN_TUI="NO"
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fi
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############################################
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# RAM / PARTITION SIZING
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############################################
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RAM_GB=$(free --giga | awk '/^Mem:/ {print $2}')
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BOOT_SIZE=15GiB
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SWAP_SIZE="${RAM_GB}GiB"
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DISK_SIZE=$(lsblk -b -dn -o SIZE "$DRIVE")
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DISK_GIB=$((DISK_SIZE / 1024 / 1024 / 1024))
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ROOT_GIB=$((DISK_GIB - RAM_GB - 15))
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echo "Partition plan:"
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echo " Boot: ${BOOT_SIZE}"
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echo " Root: ${ROOT_GIB}GiB"
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echo " Swap: ${SWAP_SIZE}"
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############################################
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# PARTITION DISK
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############################################
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parted "$DRIVE" --script mklabel gpt \
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mkpart ESP fat32 1MiB 15GiB \
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set 1 boot on \
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mkpart ROOT 15GiB "$((15 + ROOT_GIB))"GiB \
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mkpart SWAP "$((15 + ROOT_GIB))"GiB 100%
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BOOT_PART="${DRIVE}1"
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ROOT_PART="${DRIVE}2"
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SWAP_PART="${DRIVE}3"
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############################################
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# FORMAT BOOT + SWAP
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############################################
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mkfs.fat -F32 "$BOOT_PART"
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mkswap "$SWAP_PART"
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swapon "$SWAP_PART"
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############################################
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# ENCRYPTION (OPTIONAL)
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############################################
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LUKS_BACKUP_KEY="" # path to key file, set only when encryption is active
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if [[ "$ENCRYPT_DISK" == "YES" ]]; then
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echo "Encrypting root partition..."
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cryptsetup -v luksFormat "$ROOT_PART"
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cryptsetup open "$ROOT_PART" cryptroot
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# ── Auto-generate backup LUKS key ──────────────────────────────────────────
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# A random key is enrolled as a second LUKS slot so recovery is possible
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# without the primary passphrase. It is written to /_LUKS_BACKUP_KEY in the
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# new system (inside the encrypted container) where only root can read it.
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LUKS_BACKUP_KEY=$(mktemp /tmp/luks-backup-key.XXXXXX)
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dd if=/dev/urandom bs=64 count=1 2>/dev/null | base64 -w0 > "$LUKS_BACKUP_KEY"
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echo "Enrolling auto-generated backup LUKS key..."
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cryptsetup luksAddKey "$ROOT_PART" "$LUKS_BACKUP_KEY"
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# ── Optional FIDO2 enrollment ─────────────────────────────────────────────
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if [[ "$FIDO_ROOT" == "YES" ]]; then
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echo "Insert FIDO2 key for LUKS and touch when prompted..."
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systemd-cryptenroll "$ROOT_PART" --fido2-device=auto --fido2-with-client-pin=no
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fi
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############################################
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# BTRFS ON ENCRYPTED ROOT
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############################################
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mkfs.btrfs /dev/mapper/cryptroot
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mount /dev/mapper/cryptroot /mnt
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btrfs subvolume create /mnt/@
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btrfs subvolume create /mnt/@home
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umount /mnt
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mount -o subvol=@ /dev/mapper/cryptroot /mnt
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mkdir -p /mnt/home
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mount -o subvol=@home /dev/mapper/cryptroot /mnt/home
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else
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echo "Skipping encryption — formatting root directly."
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############################################
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# BTRFS ON UNENCRYPTED ROOT
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############################################
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mkfs.btrfs "$ROOT_PART"
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mount "$ROOT_PART" /mnt
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btrfs subvolume create /mnt/@
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btrfs subvolume create /mnt/@home
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umount /mnt
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mount -o subvol=@ "$ROOT_PART" /mnt
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mkdir -p /mnt/home
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mount -o subvol=@home "$ROOT_PART" /mnt/home
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fi
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mkdir -p /mnt/boot
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mount "$BOOT_PART" /mnt/boot
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# Place backup key inside the new system (only accessible when disk is unlocked)
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if [[ -n "$LUKS_BACKUP_KEY" ]]; then
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install -m 400 "$LUKS_BACKUP_KEY" /mnt/_LUKS_BACKUP_KEY
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rm -f "$LUKS_BACKUP_KEY"
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echo "Backup LUKS key written to /_LUKS_BACKUP_KEY in new system."
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fi
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############################################
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# GPU DETECTION
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############################################
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GPU_INFO=$(lspci | grep -E "VGA|3D" || true)
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GPU_PKGS=""
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if echo "$GPU_INFO" | grep -qi "NVIDIA"; then
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GPU_PKGS="nvidia nvidia-utils"
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elif echo "$GPU_INFO" | grep -qi "AMD"; then
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GPU_PKGS="xf86-video-amdgpu"
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elif echo "$GPU_INFO" | grep -qi "Intel"; then
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GPU_PKGS="xf86-video-intel"
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fi
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echo "Detected GPU: ${GPU_INFO:-none}"
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############################################
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# BASE INSTALL
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############################################
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# shellcheck disable=SC2086
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pacstrap -K /mnt base base-devel "$KERNEL" linux-firmware vim bash zsh git less btop fastfetch \
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networkmanager grub cryptsetup libfido2 pam-u2f efibootmgr sudo btrfs-progs lvm2 jq $GPU_PKGS
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############################################
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# FSTAB
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############################################
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genfstab -U /mnt >> /mnt/etc/fstab
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############################################
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# COPY ANSWERFILE INTO NEW SYSTEM
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############################################
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if $AF_MODE; then
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install -m 644 "$ANSWERFILE" /mnt/answerfile.json
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fi
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############################################
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# PASS VARIABLES INTO CHROOT
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############################################
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export HOSTNAME USERNAME USERPASS ROOT_PART KERNEL FIDO_ROOT FIDO_USER ENCRYPT_DISK
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############################################
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# CHROOT CONFIGURATION
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############################################
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arch-chroot /mnt /bin/bash <<'CHROOT_EOF'
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set -euo pipefail
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# Locale
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echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
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locale-gen
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echo "LANG=en_US.UTF-8" > /etc/locale.conf
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# Time / hostname
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ln -sf /usr/share/zoneinfo/Europe/Vienna /etc/localtime
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hwclock --systohc
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echo "$HOSTNAME" > /etc/hostname
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# NetworkManager
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systemctl enable NetworkManager
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# User
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useradd -m -G wheel -s /bin/zsh "$USERNAME"
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echo "$USERNAME:$USERPASS" | chpasswd
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echo "%wheel ALL=(ALL:ALL) ALL" >> /etc/sudoers
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###################################################
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# INITRAMFS CONFIG
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###################################################
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if [[ "$ENCRYPT_DISK" == "YES" && "$FIDO_ROOT" == "YES" ]]; then
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sed -i 's/^HOOKS=.*/HOOKS=(base udev systemd autodetect microcode modconf kms consolefont block sd-encrypt lvm2 btrfs filesystems keyboard keymap fsck)/' /etc/mkinitcpio.conf
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elif [[ "$ENCRYPT_DISK" == "YES" ]]; then
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sed -i 's/^HOOKS=.*/HOOKS=(base udev autodetect microcode modconf kms consolefont block encrypt lvm2 btrfs filesystems keyboard keymap fsck)/' /etc/mkinitcpio.conf
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else
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sed -i 's/^HOOKS=.*/HOOKS=(base udev autodetect microcode modconf kms consolefont block btrfs filesystems keyboard fsck)/' /etc/mkinitcpio.conf
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fi
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mkinitcpio -p "$KERNEL"
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###################################################
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# GRUB CONFIG
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###################################################
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UUID=$(blkid -s UUID -o value "$ROOT_PART")
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if [[ "$ENCRYPT_DISK" == "YES" ]]; then
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if [[ "$FIDO_ROOT" == "YES" ]]; then
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KERNEL_CMD="rd.luks.name=${UUID}=cryptroot root=/dev/mapper/cryptroot"
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else
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KERNEL_CMD="cryptdevice=UUID=${UUID}:cryptroot root=/dev/mapper/cryptroot"
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fi
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else
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KERNEL_CMD="root=UUID=${UUID} rootflags=subvol=@"
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fi
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sed -i "s|^GRUB_CMDLINE_LINUX=.*|GRUB_CMDLINE_LINUX=\"$KERNEL_CMD\"|" /etc/default/grub
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grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=M-Archy-GRUB
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grub-mkconfig -o /boot/grub/grub.cfg
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###################################################
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# USER FIDO2 LOGIN
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###################################################
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if [[ "$FIDO_USER" == "YES" ]]; then
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mkdir -p "/home/$USERNAME/.config/Yubico"
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echo "Insert FIDO2 key for user login and touch when prompted..."
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sudo -u "$USERNAME" pamu2fcfg -u "$USERNAME" > "/home/$USERNAME/.config/Yubico/u2f_keys"
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chown "$USERNAME":"$USERNAME" "/home/$USERNAME/.config/Yubico/u2f_keys"
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echo "auth required pam_u2f.so" >> /etc/pam.d/system-local-login
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fi
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###################################################
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# CLONE DOTFILES
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###################################################
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echo "Cloning dotfiles..."
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git clone https://git.abdelbaki.eu/The_miro/Dotfiles.git "/home/$USERNAME/Dotfiles" \
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&& chown -R "$USERNAME":"$USERNAME" "/home/$USERNAME/Dotfiles" \
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|| echo "Warning: dotfiles clone failed — clone manually after first boot."
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CHROOT_EOF
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############################################
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# DOTFILES TUI SETUP (in-chroot, optional)
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############################################
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if [[ "${RUN_TUI^^}" == "YES" ]]; then
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echo "${USERNAME} ALL=(ALL) NOPASSWD: ALL" \
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| arch-chroot /mnt tee /etc/sudoers.d/99-setup-nopasswd > /dev/null
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echo "Running tui-install.sh as ${USERNAME} inside chroot..."
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arch-chroot /mnt runuser -u "${USERNAME}" -- \
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bash "/home/${USERNAME}/Dotfiles/setup/tui-install.sh" \
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|| echo "Warning: tui-install exited with errors — check ~/dotfiles-install.log in the new system."
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arch-chroot /mnt rm -f /etc/sudoers.d/99-setup-nopasswd
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fi
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# Remove answerfile from new system after setup is complete (contains sensitive paths/config)
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if $AF_MODE && [[ -f /mnt/answerfile.json ]]; then
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rm -f /mnt/answerfile.json
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fi
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############################################
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# SUMMARY
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############################################
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echo
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echo "############################################"
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echo " INSTALL SUMMARY"
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echo "############################################"
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echo "Drive: $DRIVE"
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echo "Boot partition: $BOOT_PART"
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echo "Root partition: $ROOT_PART"
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echo "Swap partition: $SWAP_PART"
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echo
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echo "Hostname: $HOSTNAME"
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echo "Username: $USERNAME"
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echo "Kernel: $KERNEL"
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echo "GPU detected: ${GPU_INFO:-none}"
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echo
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echo "Disk encryption: $ENCRYPT_DISK"
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echo "FIDO2 root unlock: $FIDO_ROOT"
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echo "FIDO2 user login: $FIDO_USER"
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[[ "$ENCRYPT_DISK" == "YES" ]] && echo "LUKS backup key: /_LUKS_BACKUP_KEY (in new system)"
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echo
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echo "Boot size: $BOOT_SIZE"
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echo "Root size: ${ROOT_GIB}GiB"
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echo "Swap size: $SWAP_SIZE"
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echo
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echo "Log file: $LOGFILE"
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echo "############################################"
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echo
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cp "$LOGFILE" /mnt/boot/ 2>/dev/null || true
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echo "Installation complete! Unmount and reboot:"
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echo " umount -R /mnt && reboot"
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if [[ "${RUN_TUI^^}" != "YES" ]]; then
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echo
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echo "After first boot, login as $USERNAME and run:"
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echo " ~/Dotfiles/setup/tui-install.sh"
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fi
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