scripts: automate the data-disk workflow (mkdisk / sendkeys / test-disk)

- scripts/mkdisk.sh: create the FAT32 disk with mkfs.fat -C (the flag
  that actually creates the file — plain mkfs.fat fails on a missing
  path), accept M/G/K sizes, seed seed/ files via mtools; --fresh
  re-formats, --no-seed skips seeding
- scripts/sendkeys.py: type lines into the guest via the QEMU monitor
  (US layout).  Punctuation must use QEMU's named keys (minus, slash,
  dot, ...) — bare '-', '.', '/' are not valid sendkey names, and '-'
  is the modifier separator, so they were silently dropped before
- scripts/test-disk.sh: full automated round trip — build, deploy,
  ensure image, boot headless QEMU, drive the shell (ls /disk, mkdir,
  echo >, cat, poweroff), then verify with fsck.fat (must be clean)
  and mtype (file content must have survived poweroff)
- Makefile: make disk / disk-fresh / inspect / test-disk; run, run-gui
  and debug now auto-create a missing DISK_IMG; fix the stale comment
  (mkfs.fat without -C)
- scripts/boot.sh: auto-create a missing DISK_IMG via mkdisk.sh
- seed/: motd.txt + lines.txt seeded onto fresh images
- Verified end to end: ./scripts/test-disk.sh --fresh passes

1 files changed, 111 insertions, 0 deletions

diff --git a/scripts/test-disk.sh b/scripts/test-disk.sh
new file mode 100755
index 0000000..f7be7c6
--- /dev/null
+++ b/scripts/test-disk.sh
@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+#
+# scripts/test-disk.sh — full automated data-disk round trip.
+#
+# Builds the kernel, ensures the FAT32 image exists (with --fresh it is
+# re-formatted and re-seeded), boots QEMU headless, drives the shell via
+# the monitor, then verifies the results with mtools and fsck.
+#
+# Usage:
+#   ./scripts/test-disk.sh            # reuse existing image
+#   ./scripts/test-disk.sh --fresh    # re-format the image first
+#
+# Environment:
+#   DISK_IMG  data disk path (default: /tmp/disk.img)
+#   OVMF      firmware (default: /usr/share/edk2/x64/OVMF.4m.fd)
+#   QEMU      qemu binary (default: qemu-system-x86_64)
+#
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+cd "$PROJECT_DIR"
+
+FRESH=0
+[ "${1:-}" = "--fresh" ] && FRESH=1
+
+OVMF="${OVMF:-/usr/share/edk2/x64/OVMF.4m.fd}"
+QEMU="${QEMU:-qemu-system-x86_64}"
+IMG="${DISK_IMG:-/tmp/disk.img}"
+ESP_DIR="$PROJECT_DIR/esp"
+QPID=/tmp/rsdos-test-qpid
+SOCK=/tmp/rsdos-test-qmon.sock
+LOG=/tmp/rsdos-test-serial.log
+STAMP="$(date +%s)"
+
+fail() {
+        echo "FAIL: $1"
+        [ -f "$LOG" ] && tail -20 "$LOG"
+        exit 1
+}
+
+# wait_log FILE PATTERN TIMEOUT-SECONDS — poll a file for a regex.
+wait_log() {
+        local i=0
+        while [ "$i" -lt $(( ${3:-60} * 10 )) ]; do
+                grep -q "$2" "$1" 2>/dev/null && return 0
+                sleep 0.1
+                i=$((i + 1))
+        done
+        return 1
+}
+
+# wait_qemu_exit TIMEOUT-SECONDS — poll until the pid is gone.
+wait_qemu_exit() {
+        local i=0
+        while [ "$i" -lt $(( ${1:-30} * 10 )) ]; do
+                kill -0 "$(cat "$QPID" 2>/dev/null)" 2>/dev/null || return 0
+                sleep 0.1
+                i=$((i + 1))
+        done
+        return 1
+}
+
+echo "==> 1/6 build kernel (debug)"
+cargo build --package rsdos --target x86_64-unknown-uefi
+
+echo "==> 2/6 deploy to ESP + ensure disk image"
+mkdir -p "$ESP_DIR/EFI/BOOT"
+cp target/x86_64-unknown-uefi/debug/rsdos.efi "$ESP_DIR/EFI/BOOT/BOOTX64.EFI"
+"$SCRIPT_DIR/mkdisk.sh" $([ "$FRESH" -eq 1 ] && echo --fresh) "$IMG"
+
+echo "==> 3/6 boot QEMU (headless)"
+kill "$(cat "$QPID" 2>/dev/null)" 2>/dev/null || true
+sleep 1
+rm -f "$SOCK" "$LOG"
+"$QEMU" -bios "$OVMF" \
+        -drive file="$IMG",format=raw,if=none,id=disk \
+        -device ide-hd,drive=disk,bus=ide.0 \
+        -drive file=fat:rw:"$ESP_DIR",format=raw,if=none,id=esp \
+        -device ide-hd,drive=esp,bus=ide.1 \
+        -serial file:"$LOG" \
+        -monitor unix:"$SOCK",server,nowait \
+        -m 256M -machine q35 -cpu qemu64 -no-reboot -display none &
+echo $! > "$QPID"
+
+wait_log "$LOG" "boot: entering shell" 90 || fail "kernel never reached the shell"
+sleep 1
+
+echo "==> 4/6 drive the shell (ls / mkdir / echo > / cat / poweroff)"
+python3 "$SCRIPT_DIR/sendkeys.py" --sock "$SOCK" \
+        "ls /disk" \
+        "mkdir /disk/sub" \
+        "echo disk-test-$STAMP > /disk/sub/hello.txt" \
+        "cat /disk/sub/hello.txt" \
+        "poweroff"
+
+echo "==> 5/6 wait for shutdown"
+wait_qemu_exit 30 || fail "QEMU did not exit after poweroff"
+
+echo "==> 6/6 verify"
+grep -a "disk-test-$STAMP" "$LOG" >/dev/null || fail "cat output missing from serial log"
+if ! fsck.fat -n "$IMG" >/tmp/rsdos-fsck.out 2>&1; then
+        fail "fsck.fat reports problems: $(cat /tmp/rsdos-fsck.out | tail -3)"
+fi
+MT="$(mtype -i "$IMG" "::/sub/hello.txt" 2>/dev/null || true)"
+[ "$MT" = "disk-test-$STAMP" ] || fail "mtype mismatch: got '$MT'"
+
+echo ""
+echo "PASS — disk round trip OK (fsck clean, file survived poweroff)"
+echo "  image:      $IMG"
+echo "  written:    /disk/sub/hello.txt = \"disk-test-$STAMP\""