#!/bin/bash

set -e

. script_env

# Delete stale output file.
rm -f "$SDCARD_IMG"

# Create empty SD card image.
dd if=/dev/zero of="$SDCARD_IMG" bs=1M seek=507 count=1

# Create partition table.
cat <<END | /sbin/sfdisk "$SDCARD_IMG"
label: dos
start=8192, size=512000, type=e
start=524288, size=512000, type=83
END

# Create DOS partition.
/sbin/mkdosfs -F 16 --offset 8192 ${SDCARD_IMG} 256000

# Copy files to SD card.
mcopy -i ${SDCARD_IMG}@@4M ${SDCARD_DIR}/* ::

# Create empty ext4 partition for configuration.
/sbin/mke2fs -t ext4 -b 4096 -E offset=$((524288 * 512)) ${SDCARD_IMG} 256000k