# Minesweeper Minesweeper X, running under wine on a headless X display, streamed into an Officer panel. It is a game. It is also the smallest honest proof that Officer can put an arbitrary X11 program in a panel — a framebuffer, a process on it, a VNC server reading it, a client in the browser — and it is the first plugin to use the platform's per-plugin websocket relay. ## What it needs Six host binaries, declared in `manifest.ts` and checked before install: `wine`, `Xvfb`, `x11vnc`, `xdotool`, `xdpyinfo`, `winetricks`. The awkward one is wine. Minesweeper X is a **32-bit** PE (machine `0x014c`, Visual Basic 6), so the host needs i386 multiarch and a `win32` prefix. A 64-bit-only wine cannot load it, and the failure is a bare `Bad EXE format`. On Debian or Ubuntu: ``` sudo dpkg --add-architecture i386 sudo apt update sudo apt install wine wine32:i386 xvfb x11vnc x11-utils xdotool winetricks ``` ## The game [Minesweeper X](https://minesweepergame.com/download/minesweeper-x.zip) — the competition build, with timing and replay extras. `game/Minesweeper X.exe` is committed; it is 68 KB and it is the thing being run rather than state produced by running it. | | | | --- | --- | | zip sha256 | `21089193924919ef876a5b464f06bed9cc149867c51e40c259288ebe623014f0` | | exe sha256 | `e414c207adaa14999b0464c3d0a701f20ed11282d5ed0f84b27b62d25389f661` | The download needs a browser `User-Agent`; the site answers `403` to curl's default. ## Where its state lives `DATA_PATH/minesweeper/` — never in this directory, which `plugins:update` will `git pull` over. - `prefix/` — the wine prefix, ~600 MB, built on first `POST /start`. Deleting it is still the standard fix for a wedged wine and the next start rebuilds it — but it now takes the replays with it, see below. - `prefix/drive_c/Minesweeper/` — where the game RUNS from, and where its replays land. The executable is copied here on every start; `C:` is the only drive the prefix has, so this is the only directory the game has a writable path to. Launched from the plugin checkout instead, its own path came back as `\\?\unix\home\…` and finishing a game raised `Run-time error '76': Path not found` while it tried to auto-save the recording. - `run/` — pid state, logs, and `vnc.sock`. **Mode 0700, and that is load-bearing.** ## Two gaps, both from having no window manager Worth knowing before you conclude something is broken. Neither is hard to fix; neither is fixed. **Some dialogs cannot be closed.** There is no window manager, so no window has a title bar. A dialog with its own OK button is fine — the run-time error box is — but Extras → Auto Options has neither an OK button nor a Cancel, and its only exit was the title bar. Restarting the sidecar clears it. **The panel sends no keyboard events at all.** `MinesweeperPanel` forwards pointer events and nothing else, so Escape does not reach the game and a Custom board cannot be typed in. Adding keys to the RFB client is the smaller half of this; wine also expects a window manager to hand it focus. ## Two things worth knowing before you change anything **x11vnc has no password, and that is correct — but only because it also has no port.** It binds a unix socket inside `run/`, mode 0700. The kernel refuses every other account before x11vnc is asked anything, so a password would be a second lock on a door only one person can reach. The version this replaced bound `127.0.0.1:5907` with `-nopw`, which is a different claim entirely — every local account could open it and take the display. **`-unixsock` does not remove the TCP listener, and the first alpha shipped believing it did.** It adds a unix socket beside the port; x11vnc was on `0.0.0.0:5900` and `[::]:5900` with no password, reachable from the whole tailnet and the whole LAN, under a comment saying there was no port at all. Three flags close it and each one earns its place: `-rfbport 0` for IPv4, `-rfbportv6 0` for IPv6 — `-rfbport 0` alone leaves `[::]:5900` up — and `-noipv6` for outgoing sockets. The check that matters is `ss -lntp` against the **running** process. Reading the arguments cannot show a listener that exists because a flag is missing, and running the same arguments by hand did not reproduce it either. **The game is centred on a fixed stage, and the whole stage is what you see.** The framebuffer is 560x400 whatever the difficulty, `sidecar/session.ts` keeps the window in the middle of it, and the panel draws the framebuffer entire — scaled to fit, never cropped. So changing difficulty moves the board rather than resizing the panel, and the surround is teal (`-solid`) rather than the root's black. **The stage is small because the panel scales it by whole numbers.** Pixel art at a fractional scale gets uneven cells — some three screen pixels wide, their neighbours two — which reads as "not quite right" rather than as blur, and `image-rendering: pixelated` does not help because unevenness is not blur. So the panel picks the largest whole number of DEVICE pixels per source pixel and every pixel of empty stage is panel the game does not get: in an 1866-device-pixel panel, 800 wide lands on 2x and 560 wide lands on 3x. 560x400 is expert (504x342) plus a margin. A custom board bigger than that is clipped at the right and bottom rather than shrunk, with the menu bar kept reachable. It used to park the window at the origin and have the client crop to the window's size, polled every four seconds. That resized the panel under the player, and it was off by the 3x29 wine puts between the root origin and the window — a black strip along the top and a row of cut-off cells along the bottom, worst on expert. `GET /status` still reports the window geometry; nothing consumes it now, it is a diagnostic. **The wine prefix is confined to `C:` on every start.** A fresh prefix maps the whole filesystem to `Z:` and symlinks the profile into the real home, and Minesweeper X has Open and Save dialogs for its replays. That is why this was an ungrantable `execution` capability in the platform. `sidecar/prefix.ts` closes it instead, which is what makes the plugin's permission safe to grant. Wine restores `z:` whenever it updates a prefix, so the confinement is re-asserted rather than done once. ## Contract ``` GET /api/minesweeper/status { installed, running, window, error? } POST /api/minesweeper/start idempotent; builds the prefix on a cold install (minutes) POST /api/minesweeper/stop /api/plugin-ws/minesweeper the display, as RFB ``` ## Where this came from Built first as a standalone directory, `officer-dev/wine-minesweeper`, and folded in here when it became a plugin. Two things from that work are worth keeping, because both are judgement calls somebody will otherwise make again from scratch. **Wine came from Ubuntu noble, not the WineHQ repository.** The distribution package is older — 9.0 — and that is fine for a 2017 VB6 application. The alternative was adding a third-party apt source, with its key and its update cadence, to a machine that runs a bitcoin wallet and a mail store, for a game of Minesweeper. If a future version genuinely needs newer wine, that trade is worth revisiting; until then it is not. **Enabling i386 pulled four krb5 libraries forward** within noble-updates. That was checked before installing rather than after: nothing moved near libc, systemd, openssl or postgres. Worth re-checking on any host where `dpkg --add-architecture i386` is new, since it is the one step here that changes how the whole machine resolves packages and is never undone by uninstalling the plugin. ### The original verification baseline From the standalone build, on Ubuntu noble with wine 9.0. Useful as a comparison when something feels wrong rather than as a test to run: - The game launches in about a second and draws the classic beginner board at **152x214**. - A synthetic `xdotool` click opens a region and starts the timer — so **input reaches the game**, which is the part that matters for a playable stream and the part a screenshot cannot tell you. - x11vnc completes an **RFB 003.008** handshake and reports an 800x600 32bpp framebuffer. - Cold start, display through to game window, in under two seconds. That excludes building the prefix, which happens once and takes minutes. The shell prototype that ran all this (`bin/session.sh`) is not kept. Everything it knew — waiting for a usable display rather than a live pid, parking the window at the origin, and clearing the whole wine process family on stop — is in `sidecar/session.ts`, with the reasoning attached to the code that depends on it.