refactor: rename custom/ to installer/ for clarity

The custom/ directory name was an archiso implementation detail. Renamed
to installer/ which clearly communicates that this directory contains the
installer scripts and utilities that ship on the ISO.

Updated all references in build.sh, Makefile, test-install.sh, and README.

1 files changed, 173 insertions, 0 deletions

diff --git a/installer/lib/common.sh b/installer/lib/common.sh
new file mode 100644
index 0000000..0f02e37
--- /dev/null
+++ b/installer/lib/common.sh
@@ -0,0 +1,173 @@
+#!/usr/bin/env bash
+# common.sh - Shared functions for archangel installer
+# Source this file: source "$(dirname "$0")/lib/common.sh"
+
+#############################
+# Output Functions
+#############################
+
+# Colors (optional, gracefully degrade if not supported)
+if [[ -t 1 ]]; then
+    RED='\033[0;31m'
+    GREEN='\033[0;32m'
+    YELLOW='\033[0;33m'
+    BLUE='\033[0;34m'
+    BOLD='\033[1m'
+    NC='\033[0m' # No Color
+else
+    RED=''
+    GREEN=''
+    YELLOW=''
+    BLUE=''
+    BOLD=''
+    NC=''
+fi
+
+info()   { echo -e "${GREEN}[INFO]${NC} $1"; }
+warn()   { echo -e "${YELLOW}[WARN]${NC} $1"; }
+error()  { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }
+step()   { echo ""; echo -e "${BOLD}==> $1${NC}"; }
+prompt() { echo -e "${BLUE}$1${NC}"; }
+
+# Log to file if LOG_FILE is set
+log() {
+    local msg
+    msg="[$(date +'%Y-%m-%d %H:%M:%S')] $1"
+    if [[ -n "$LOG_FILE" ]]; then
+        echo "$msg" >> "$LOG_FILE"
+    fi
+}
+
+#############################
+# Validation Functions
+#############################
+
+require_root() {
+    if [[ $EUID -ne 0 ]]; then
+        error "This script must be run as root"
+    fi
+}
+
+command_exists() {
+    command -v "$1" &>/dev/null
+}
+
+require_command() {
+    command_exists "$1" || error "Required command not found: $1"
+}
+
+#############################
+# FZF Prompts
+#############################
+
+# Check if fzf is available
+has_fzf() {
+    command_exists fzf
+}
+
+# Generic fzf selection
+# Usage: result=$(fzf_select "prompt" "option1" "option2" ...)
+fzf_select() {
+    local prompt="$1"
+    shift
+    local options=("$@")
+
+    if has_fzf; then
+        printf '%s\n' "${options[@]}" | fzf --prompt="$prompt " --height=15 --reverse
+    else
+        # Fallback to simple select
+        PS3="$prompt "
+        select opt in "${options[@]}"; do
+            if [[ -n "$opt" ]]; then
+                echo "$opt"
+                break
+            fi
+        done
+    fi
+}
+
+# Multi-select with fzf
+# Usage: readarray -t results < <(fzf_multi "prompt" "opt1" "opt2" ...)
+fzf_multi() {
+    local prompt="$1"
+    shift
+    local options=("$@")
+
+    if has_fzf; then
+        printf '%s\n' "${options[@]}" | fzf --prompt="$prompt " --height=20 --reverse --multi
+    else
+        # Fallback: just return all options (user must edit)
+        printf '%s\n' "${options[@]}"
+    fi
+}
+
+#############################
+# Filesystem Selection
+#############################
+
+# Select filesystem type (ZFS or Btrfs)
+# Sets global FILESYSTEM variable
+select_filesystem() {
+    step "Select Filesystem"
+
+    local options=(
+        "ZFS - Built-in encryption, best data integrity (recommended)"
+        "Btrfs - Copy-on-write, LUKS encryption, GRUB snapshot boot"
+    )
+
+    local selected
+    selected=$(fzf_select "Filesystem:" "${options[@]}")
+
+    case "$selected" in
+        ZFS*)
+            FILESYSTEM="zfs"
+            info "Selected: ZFS"
+            ;;
+        Btrfs*)
+            FILESYSTEM="btrfs"
+            info "Selected: Btrfs"
+            ;;
+        *)
+            error "No filesystem selected"
+            ;;
+    esac
+}
+
+#############################
+# Disk Utilities
+#############################
+
+# Get disk size in human-readable format
+get_disk_size() {
+    local disk="$1"
+    lsblk -dno SIZE "$disk" 2>/dev/null | tr -d ' '
+}
+
+# Get disk model
+get_disk_model() {
+    local disk="$1"
+    lsblk -dno MODEL "$disk" 2>/dev/null | tr -d ' ' | head -c 20
+}
+
+# Check if disk is in use (mounted or has holders)
+disk_in_use() {
+    local disk="$1"
+    [[ -n "$(lsblk -no MOUNTPOINT "$disk" 2>/dev/null | grep -v '^$')" ]] && return 0
+    [[ -n "$(ls /sys/block/"$(basename "$disk")"/holders/ 2>/dev/null)" ]] && return 0
+    return 1
+}
+
+# List available disks (not in use)
+list_available_disks() {
+    local disks=()
+    for disk in /dev/nvme[0-9]n[0-9] /dev/sd[a-z] /dev/vd[a-z]; do
+        [[ -b "$disk" ]] || continue
+        disk_in_use "$disk" && continue
+        local size
+        size=$(get_disk_size "$disk")
+        local model
+        model=$(get_disk_model "$disk")
+        disks+=("$disk ($size, $model)")
+    done
+    printf '%s\n' "${disks[@]}"
+}