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, 4 insertions, 1 deletions

diff --git a/rsnix/src/ahci.rs b/rsnix/src/ahci.rs
index 2efe3b4..427345d 100644
--- a/rsnix/src/ahci.rs
+++ b/rsnix/src/ahci.rs
@@ -182,7 +182,10 @@ fn start_port(abar: usize, port_idx: u32) -> Option<Disk> {
     };
     // IDENTIFY DEVICE as a sanity check + to learn the capacity.
     if issue(&d, ATA_IDENTIFY, 0, 1, false).is_err() {
-        crate::serial_println!("ahci: IDENTIFY failed on port {} (not an ATA disk?)", port_idx);
+        crate::serial_println!(
+            "ahci: IDENTIFY failed on port {} (not an ATA disk?)",
+            port_idx
+        );
         return None;
     }
     let id = unsafe { core::slice::from_raw_parts(d.buf as *const u16, 256) };