Refactored installer into modular library structure with improved error handling and logging.

The changes include:
- Split monolithic script into lib/, config/, profiles/, and files/ directories
- Added error handling with cleanup on failure
- Added installation logging to /var/log/arch-install.log
- Added username validation

lib/system/bootloader.sh

@@ -0,0 +1,88 @@
+#!/bin/bash
+
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# bootloader.sh - systemd-boot configuration
+#
+# Installs and configures systemd-boot as the bootloader:
+# - Runs bootctl install to set up EFI boot manager
+# - Creates boot entry with LUKS unlock parameters
+# - Supports both single-disk and RAID1 configurations
+# - Configures loader.conf timeout setting
+
+# Install systemd-boot bootloader
+install_bootloader() {
+    print "Installing bootloader..."
+    run_visible_cmd chroot_run bootctl install
+}
+
+# Create boot entry for single-disk installation
+# Arguments:
+#   $1 - LUKS UUID
+create_boot_entry_single() {
+    local luks_uuid="$1"
+
+    chroot_run sh -c "cat > /boot/loader/entries/arch.conf" <<EOF
+title   Arch Linux
+linux   /vmlinuz-linux
+initrd  /initramfs-linux.img
+options rd.luks.name=${luks_uuid}=cryptroot rd.luks.options=discard root=/dev/mapper/cryptroot
+EOF
+}
+
+# Create boot entry for RAID1 installation
+# Arguments:
+#   $1 - first LUKS UUID
+#   $2 - second LUKS UUID
+create_boot_entry_raid1() {
+    local luks_uuid_1="$1"
+    local luks_uuid_2="$2"
+
+    chroot_run sh -c "cat > /boot/loader/entries/arch.conf" <<EOF
+title   Arch Linux
+linux   /vmlinuz-linux
+initrd  /initramfs-linux.img
+options rd.luks.name=${luks_uuid_1}=cryptroot-primary rd.luks.name=${luks_uuid_2}=cryptroot-secondary rd.luks.options=${luks_uuid_1}=discard rd.luks.options=${luks_uuid_2}=discard root=/dev/mapper/cryptroot-primary
+EOF
+}
+
+# Create appropriate boot entry based on storage mode
+# Arguments:
+#   $1 - storage mode (single, raid1)
+create_boot_entry() {
+    local storage_mode="$1"
+
+    if [ "$storage_mode" = "raid1" ]; then
+        create_boot_entry_raid1 "$LUKS_UUID" "$LUKS_UUID_2"
+    else
+        create_boot_entry_single "$LUKS_UUID"
+    fi
+}
+
+# Configure loader.conf timeout
+configure_loader() {
+    chroot_run sed -i '/^#timeout 3/s/^#//' /boot/loader/loader.conf
+}
+
+# Full bootloader setup
+# Arguments:
+#   $1 - storage mode
+setup_bootloader() {
+    local storage_mode="$1"
+
+    install_bootloader
+    create_boot_entry "$storage_mode"
+    configure_loader
+}