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#!/usr/bin/env bash
#
# scripts/mkdisk.sh — create (or re-create) the FAT32 data disk that the
# kernel mounts at /disk.
#
# Usage:
# ./scripts/mkdisk.sh # create /tmp/disk.img (64M) if missing
# ./scripts/mkdisk.sh --fresh # re-format (wipes the image!)
# ./scripts/mkdisk.sh --size 128M # different size (default 64M)
# ./scripts/mkdisk.sh /path/img # custom image path
# ./scripts/mkdisk.sh --no-seed # skip the seed/ directory
# ./scripts/mkdisk.sh --label CRASHLOG # volume label (default RSDOS)
#
# The image is created with `mkfs.fat -C`, which is the option that
# actually creates the file — plain `mkfs.fat` only writes into an
# existing one. Files from seed/ (if present) are copied in with mtools.
#
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
IMG="/tmp/disk.img"
SIZE="64M"
FRESH=0
SEED_DIR="$PROJECT_DIR/seed"
LABEL="RSDOS"
while [ $# -gt 0 ]; do
case "$1" in
--fresh) FRESH=1 ;;
--size)
shift
SIZE="$1"
;;
--no-seed) SEED_DIR="" ;;
--label)
shift
LABEL="$1"
;;
--help | -h)
head -20 "$0" | grep "^#" | sed 's/^# \?//'
exit 0
;;
*)
IMG="$1"
;;
esac
shift
done
if [ -f "$IMG" ] && [ "$FRESH" -eq 0 ]; then
echo "mkdisk: $IMG already exists (use --fresh to re-format)"
exit 0
fi
if ! command -v mkfs.fat >/dev/null 2>&1; then
echo "mkdisk: mkfs.fat not found — install dosfstools (sudo apt install dosfstools)" >&2
exit 1
fi
# mkfs.fat sizes are 1024-byte blocks; accept M/G/K suffixes too.
case "$SIZE" in
*G) SIZE_BLOCKS=$((${SIZE%G} * 1024 * 1024)) ;;
*M) SIZE_BLOCKS=$((${SIZE%M} * 1024)) ;;
*K) SIZE_BLOCKS=$((${SIZE%K})) ;;
*) SIZE_BLOCKS="$SIZE" ;;
esac
if [ -z "$SIZE_BLOCKS" ] || [ "$SIZE_BLOCKS" -le 0 ] 2>/dev/null; then
echo "mkdisk: bad size '$SIZE' (use e.g. 64M or 65536)" >&2
exit 1
fi
echo "mkdisk: creating $IMG ($SIZE FAT32, label $LABEL)"
rm -f "$IMG"
mkfs.fat -C -F 32 -n "$LABEL" "$IMG" "$SIZE_BLOCKS"
if [ -n "$SEED_DIR" ] && [ -d "$SEED_DIR" ]; then
if ! command -v mcopy >/dev/null 2>&1; then
echo "mkdisk: warning: mcopy not found — skipping seed files (install mtools)" >&2
else
echo "mkdisk: seeding from $SEED_DIR/"
for f in "$SEED_DIR"/*; do
[ -f "$f" ] || continue
mcopy -i "$IMG" "$f" "::/$(basename "$f")"
echo " -> $(basename "$f")"
done
fi
fi
echo "mkdisk: done — boot with: make run (or: ./scripts/boot.sh)"
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