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/network.sh

@@ -0,0 +1,95 @@
+#!/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.
+
+# network.sh - Network configuration
+#
+# Handles network setup for both installation and target system:
+# - Verifies internet connectivity before installation begins
+# - Checks system time synchronization via systemd-timesyncd
+# - Configures pacman mirrorlist to use private mirror
+# - Enables systemd-resolved, systemd-networkd, and systemd-timesyncd
+# - Optionally installs iwd for Wi-Fi support
+
+# Check internet connectivity
+check_internet() {
+    print "Checking internet connectivity..."
+
+    if curl -s --head "$INTERNET_CHECK_URL" | grep "200" >/dev/null; then
+        print_success "Internet connection is available!"
+        return 0
+    else
+        print_error "Internet connection appears not available (HTTP request to \"$INTERNET_CHECK_URL\" failed). Please check network settings and re-run this script."
+        return 1
+    fi
+}
+
+# Check system time synchronization
+check_time_sync() {
+    print "Checking system time synchronization state..."
+
+    if timedatectl status | grep -q "System clock synchronized: yes"; then
+        print_success "System time is synchronized!"
+        return 0
+    else
+        print_error "The system time is not synchronized. Please check systemd-timesyncd and re-run this script."
+        return 1
+    fi
+}
+
+# Configure pacman mirrorlist
+configure_mirrorlist() {
+    print "Setting mirrorlist to use private mirror..."
+    echo "Server = ${MIRROR_URL}" > /etc/pacman.d/mirrorlist
+}
+
+# Enable systemd-resolved
+enable_resolved() {
+    print "Enabling systemd-resolved..."
+
+    chroot_enable systemd-resolved.service
+    ln -sf ../run/systemd/resolve/stub-resolv.conf "${MOUNT_POINT}/etc/resolv.conf"
+}
+
+# Enable systemd-networkd
+enable_networkd() {
+    print "Enabling systemd-networkd..."
+    chroot_enable systemd-networkd.service
+}
+
+# Enable systemd-timesyncd
+enable_timesyncd() {
+    print "Enabling systemd-timesyncd..."
+    chroot_enable systemd-timesyncd.service
+}
+
+# Prompt and install iwd for Wi-Fi support
+prompt_install_wifi() {
+    print "Would you like to install iwd for Wi-Fi support? Enter 'y' exactly for yes, otherwise anything else to skip."
+    read -r install_iwd
+
+    if [ "$install_iwd" = "y" ]; then
+        print "Installing iwd..."
+        chroot_install iwd
+        chroot_enable iwd.service
+    fi
+}
+
+# Full network setup
+setup_network() {
+    enable_resolved
+    enable_networkd
+    enable_timesyncd
+}