Initial shared NixOS modules

system/default/editor.nix

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+{ ... }:
+{
+  # Configure nano as a more user-friendly editor
+  environment.variables = {
+    EDITOR = "nano";
+    VISUAL = "nano";
+  };
+}

system/default/nix.nix

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+{ ... }:
+{
+  # Nix package manager configuration
+  nix = {
+    settings = {
+      # Enable experimental features for modern Nix functionality
+      # - "nix-command": Enables the new unified 'nix' command interface
+      # - "flakes": Enables Nix flakes for reproducible and composable configurations
+      experimental-features = "nix-command flakes";
+
+      # Specify which users are allowed to run nix commands
+      allowed-users = [ "tb" ];
+
+      # Users who can act as trusted users (can override settings)
+      # Trusted users can use --option flags and import from derivations
+      trusted-users = [ "root" "tb" ];
+
+      # Show more lines of build output on failure
+      log-lines = 50;
+    };
+
+    # Automatic garbage collection configuration
+    # Helps manage disk space by cleaning up unused store paths
+    gc = {
+      # Enable automatic garbage collection
+      automatic = true;
+
+      # Delete store paths older than 30 days during garbage collection
+      options = "--delete-older-than 30d";
+    };
+
+    # Automatic store optimization configuration
+    # Reduces disk usage by hard-linking identical files in the Nix store
+    optimise = {
+      # Enable automatic store optimization
+      # This deduplicates files to save disk space
+      automatic = true;
+
+      # Run optimization weekly
+      dates = [ "weekly" ];
+    };
+  };
+
+  # Nixpkgs package collection configuration
+  nixpkgs = {
+    config = {
+      # Allow installation of packages with non-free licenses
+      # This includes proprietary software like Discord, Slack, etc.
+      # Without this, only free/open-source packages can be installed
+      allowUnfree = true;
+
+      # Allow packages marked as broken (use with caution)
+      #allowBroken = false;
+    };
+  };
+}

system/default/packages.nix

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+# Default commandline utility packages.
+# These are installed on all systems for essential functionality.
+# Organized by category for maintainability.
+
+{ config, pkgs, ... }: {
+
+  environment.systemPackages = with pkgs; [
+
+    # === CORE SYSTEM UTILITIES ===
+    # Essential command-line tools for basic system operations
+
+    bc                 # Command-line calculator
+    coreutils          # Basic file, shell and text manipulation utilities
+    file               # Determine file types
+    which              # Locate commands in PATH
+
+    # === TEXT EDITORS AND VIEWERS ===
+    # Basic text editing and viewing capabilities
+
+    nano               # Simple, user-friendly text editor
+
+    # === VERSION CONTROL ===
+    # Source code management
+
+    git                # Distributed version control system
+
+    # === SEARCH AND FILTERING ===
+    # Tools for finding and processing text/files
+
+    gnugrep            # Pattern matching and text search
+    ripgrep            # Fast text search tool (rg)
+
+    # === FILE MANAGERS ===
+    # Interactive file management
+
+    mc                 # Midnight Commander - text-based file manager
+
+    # === NETWORK UTILITIES ===
+    # Network diagnostics and file transfer
+
+    curl               # Command-line HTTP client
+    nmap               # Network exploration and security auditing
+    openssl            # Cryptographic toolkit and SSL/TLS library
+    wget               # File downloader
+
+    # === SYNC AND BACKUP ===
+    # File synchronization and backup tools
+
+    rclone             # Cloud storage sync tool
+    rsync              # Fast, versatile file copying tool
+
+    # === FILE UTILITIES ===
+    # File manipulation and organization
+
+    jq                 # JSON processor
+    ncdu               # Disk usage analyzer with ncurses interface
+    pv                 # Progress viewer for data through pipes
+    renameutils        # Bulk file renaming utilities
+
+    # === COMPRESSION AND ARCHIVES ===
+    # Support for various compression formats
+
+    lzip               # Lzip compression
+    pigz               # Parallel gzip implementation
+    unzip              # Extract ZIP archives
+    xz                 # XZ compression utilities
+    zip                # Create ZIP archives
+    zstd               # Zstandard compression
+
+    # === SYSTEM MONITORING ===
+    # Performance monitoring and system information
+
+    bmon               # Network bandwidth monitor
+    htop               # Interactive process viewer
+    lsof               # List open files and network connections
+
+    # === TERMINAL AND SHELL ===
+    # Terminal functionality and shell tools
+
+    screen             # Terminal multiplexer
+    rxvt-unicode-unwrapped.terminfo  # Terminal info for urxvt
+
+    # === DEVELOPMENT TOOLS ===
+    # Development and debugging utilities
+
+    xxd                # Hex dump utility
+
+    # === HARDWARE UTILITIES ===
+    # Hardware information and diagnostics
+
+    lshw               # Hardware information tool
+    pciutils           # PCI bus utilities (lspci)
+    smartmontools      # Hard drive health monitoring
+
+    # === DISK AND STORAGE ===
+    # Storage testing and management
+
+    disk-filltest      # Disk testing utility
+
+  ] ++ (if pkgs.stdenv.isLinux then [
+    # === LINUX-SPECIFIC PACKAGES ===
+    # Packages that are only available/useful on Linux systems
+
+    # --- KERNEL AND SYSTEM ---
+
+    config.boot.kernelPackages.cpupower  # CPU frequency utilities
+
+    # --- NETWORK ADMINISTRATION ---
+
+    iptables           # Firewall administration
+    ethtool            # Ethernet device configuration
+
+    # --- HARDWARE MANAGEMENT ---
+
+    hdparm             # Hard disk parameter tuning
+    usbutils           # USB device utilities (lsusb)
+    dmidecode          # DMI/SMBIOS information
+
+    # --- PROCESS AND SYSTEM MONITORING ---
+
+    iotop              # I/O monitoring by process
+    psmisc             # Additional process utilities (killall, pstree)
+
+    # --- COMPRESSION (Linux-specific) ---
+
+    unrar              # Extract RAR archives (non-free)
+
+    # --- FILE SYSTEM UTILITIES ---
+
+    inotify-tools      # File system event monitoring
+    sshfs              # Mount remote filesystems over SSH
+
+  ] else [
+  ]) ++ (if pkgs.stdenv.isDarwin then [
+
+    # === MACOS-SPECIFIC PACKAGES ===
+    # Packages specifically for macOS systems
+
+    # Currently empty - add macOS-specific tools here as needed
+    # Examples: darwin.apple_sdk.frameworks.Security
+
+  ] else []);
+}

system/default/system.nix

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+{ ... }:
+{
+  # Environment package management
+  # Remove unnecessary default packages to keep system minimal
+  # Default packages usually include basic utilities that might not be needed
+  environment.defaultPackages = [ ];
+
+  # Clean up temporary files on every boot
+  # This prevents /tmp from accumulating old files and filling up
+  boot.tmp.cleanOnBoot = true;
+
+  # Disable coredumps to prevent filling up /var/lib/systemd/coredump/
+  # Coredumps can quickly consume large amounts of disk space
+  systemd.coredump.enable = false;
+}