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#!/usr/bin/env bash
# =============================================================================
# tools/boot-image.sh — Create a bootable disk image from the ESP directory
#
# Produces a raw disk image (bootable via UEFI) for dd-ing to a USB stick
# or attaching to QEMU as a hard disk.
#
# Usage:
# ./tools/boot-image.sh [output.img]
#
# Default output: raisernics.img
# =============================================================================
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
cd "$SCRIPT_DIR"
OUTPUT="${1:-raisernics.img}"
ESP_DIR="${ESP_DIR:-esp}"
MBR_SZ=1 # 1 MB reserved at start for GPT/pmbr
SECTOR_SZ=512
# Rebuild ESP if stale
make all
if [ ! -d "$ESP_DIR" ]; then
echo "ERROR: ESP directory '$ESP_DIR' not found. Run 'make all' first."
exit 1
fi
# Calculate required size: ESP contents + MBR gap + some slack
ESP_SIZE_MB=$(du -sm "$ESP_DIR" 2>/dev/null | cut -f1 || echo 1)
TOTAL_MB=$((ESP_SIZE_MB + MBR_SZ + 1)) # +1 MB slack
echo "Creating ${TOTAL_MB} MB disk image: ${OUTPUT}"
# Create empty image with MBR gap
dd if=/dev/zero of="$OUTPUT" bs=1M count="$TOTAL_MB" status=none 2>/dev/null
# Partition table: single GPT partition, type EFI System (C12A7328-F81F-11D2-BA4B-00A0C93EC93B)
sgdisk --clear \
--new=1:${MBR_SZ}M:0 \
--typecode=1:C12A7328-F81F-11D2-BA4B-00A0C93EC93B \
--change-name=1:"raisernics" \
"$OUTPUT" >/dev/null
# Find partition offset
PART_START=$(sgdisk --info=1 "$OUTPUT" 2>/dev/null | grep "Partition start sector" | awk '{print $NF}')
if [ -z "$PART_START" ]; then
PART_START=$((MBR_SZ * 1024 * 1024 / SECTOR_SZ))
fi
# Format as FAT32
mformat -i "$OUTPUT"@$((PART_START * SECTOR_SZ)) -h 32 -s 32 -t "$((TOTAL_MB * 2))" >/dev/null 2>&1 || true
# Copy the ESP contents onto the partition
mcopy -i "$OUTPUT"@$((PART_START * SECTOR_SZ)) -s "$ESP_DIR"/* ::/ 2>/dev/null
echo " -> ${OUTPUT} ($(ls -lh "$OUTPUT" | awk '{print $5}'))"
echo ""
echo "To write to USB: sudo dd if=${OUTPUT} of=/dev/sdX bs=4M status=progress"
echo "To test with QEMU: qemu-system-x86_64 -bios <OVMF> -drive file=${OUTPUT},format=raw"
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