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, 5 insertions, 0 deletions

diff --git a/scripts/boot.sh b/scripts/boot.sh
index 26064f9..99fd103 100755
--- a/scripts/boot.sh
+++ b/scripts/boot.sh
@@ -95,6 +95,11 @@ echo "  gui:   $([ -n "$GUI" ] && echo yes || echo no)"
 echo "  gdb:   $([ -n "$DEBUG" ] && echo ':1234' || echo off)"
 echo ""
 
+if [ ! -f "$DISK_IMG" ]; then
+        echo "  (creating missing disk image: $DISK_IMG)"
+        "$SCRIPT_DIR/mkdisk.sh" "$DISK_IMG"
+fi
+
 if [ -f "$DISK_IMG" ]; then
         DISK_ARGS=(
                 -drive "file=$DISK_IMG,format=raw,if=none,id=disk"