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

config/defaults.conf

@@ -0,0 +1,54 @@
+#!/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.
+
+# defaults.conf - Default configuration values for the Arch Linux Installer
+#
+# Central configuration file for paths, URLs, and base packages.
+
+# Installer identification
+INSTALLER_NAME="LogalDeveloper's Arch Linux Installer"
+
+# Network configuration
+INTERNET_CHECK_URL="https://logal.dev/"
+MIRROR_URL='https://mirrors.logal.dev/archlinux/$repo/os/$arch'
+
+# Paths
+CA_CERT_PATH="${SCRIPT_DIR}/files/certs/logalnet-internal-ca.crt"
+CONFIG_SRC_DIR="${SCRIPT_DIR}/files/etc"
+HOME_CONFIG_DIR="${SCRIPT_DIR}/files/home"
+MOUNT_POINT="/mnt"
+
+# Base packages to install with pacstrap
+BASE_PACKAGES=(
+    base
+    linux
+    linux-firmware
+    bash-completion
+    btrfs-progs
+    smartmontools
+    lm_sensors
+    man-db
+    btop
+    htop
+    nano
+    less
+    tmux
+    rsync
+    sudo
+    iptables-nft
+    openssh
+    usbguard
+)

config/luks.conf

@@ -0,0 +1,28 @@
+#!/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.
+
+# luks.conf - LUKS encryption parameters
+#
+# Cryptographic settings for full-disk encryption using LUKS2.
+
+LUKS_TYPE="luks2"
+LUKS_CIPHER="aes-xts-plain64"
+LUKS_HASH="sha512"
+LUKS_KEY_SIZE="512"
+LUKS_PBKDF="argon2id"
+LUKS_PBKDF_ITERATIONS="8"
+LUKS_PBKDF_MEMORY="4194304"
+LUKS_PBKDF_PARALLEL="4"