ducoterra
c5da9461a2
A wall display is now a target client: Fedora Silverblue running GNOME Kiosk, auto-logged in as kiosk, showing /watch fullscreen in Firefox. docs/kiosk-silverblue/ carries the idempotent installer, a read-only checker and a probe that measures what the browser actually renders, so a second client is a copy-paste and nothing about it needs a keyboard. The runbook records what the upstream tutorial leaves out: gsettings only commits from inside the session (gnome-kiosk sets DCONF_PROFILE, so a system dconf db is never read at all), window-config.ini wins by being found first and therefore silently loses the shipped notification rules, AccountsService caches Session= until its daemon restarts, and /watch survives a bare LAN IP while /mirror cannot. Verified on the reference client: cold boot back to a subscribed wall in under 60s, viewport == window == screen at 3840x2160, and the sharer's own peer connection to it reports connected. LLM-Generated: true
111 lines
4.1 KiB
Python
111 lines
4.1 KiB
Python
#!/usr/bin/env python3
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"""dim-probe.py — measure what a headless kiosk actually renders.
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A kiosk has no keyboard, no monitor you can read and (on Silverblue) no
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xdotool/grim to ask the compositor. So ask the browser instead: this serves one
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page that reports its own viewport and screen size back as a request, which
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lands in this server's log.
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Run it on a machine the kiosk can reach:
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python3 dim-probe.py # listens on 0.0.0.0:8099
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then point the kiosk at it for a moment:
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sudo KIOSK_URL=http://<this-host>:8099/ sh install-kiosk.sh
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sudo pkill -u kiosk firefox # the kiosk loop reloads and relaunches
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`innerWidth == screen.width` and `fullscreenElement == null` is the signature of
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a real fullscreen window: the page occupies the whole output, so there is no
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browser chrome and no panel left over to measure. (Firefox does not report
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itself as a document.fullscreenElement when the window is fullscreen at
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startup — that API is for in-page requestFullscreen.)
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Read-only, no dependencies, ctrl-C to stop.
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"""
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from __future__ import annotations
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import http.server
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import socketserver
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import sys
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import time
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PORT = int(sys.argv[1]) if len(sys.argv) > 1 else 8099
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PAGE = b"""<!doctype html><html><head><meta charset="utf-8"><title>dim-probe</title></head>
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<body style="margin:0;background:#0a0f14;color:#4fd1c5;font:700 8vmin system-ui">
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<div id="t">dim-probe</div>
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<script>
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function report(tag) {
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const q = new URLSearchParams({
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tag: tag,
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inner: window.innerWidth + "x" + window.innerHeight,
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outer: window.outerWidth + "x" + window.outerHeight,
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screen: screen.width + "x" + screen.height,
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avail: screen.availWidth + "x" + screen.availHeight,
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dpr: window.devicePixelRatio,
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fsElement: document.fullscreenElement ? document.fullscreenElement.tagName : "null",
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ua: encodeURIComponent(navigator.userAgent.slice(0, 40)),
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});
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new Image().src = "/d?" + q.toString();
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}
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report("load");
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// Two more samples: if the window is still settling, the numbers move.
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setTimeout(() => report("t2s"), 2000);
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setTimeout(() => report("t6s"), 6000);
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setInterval(() => report("poll"), 10000);
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</script>
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</body></html>
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"""
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PNG1x1 = bytes.fromhex(
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"89504e470d0a1a0a0000000d49484452000000010000000108060000001f15c489"
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"0000000d4944415478da6360000002000100fdff03fd0000000049454e44ae426082"
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)
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class Handler(http.server.BaseHTTPRequestHandler):
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def do_GET(self) -> None:
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if self.path.startswith("/d?"):
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query = self.path.split("?", 1)[1]
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fields = dict(kv.split("=", 1) for kv in query.split("&") if "=" in kv)
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print(
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f"{time.strftime('%H:%M:%S')} "
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f"{self.client_address[0]:<15} "
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f"{fields.get('tag', '?'):<5} "
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f"viewport={fields.get('inner', '?'):<11} "
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f"window={fields.get('outer', '?'):<11} "
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f"screen={fields.get('screen', '?'):<11} "
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f"available={fields.get('avail', '?'):<11} "
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f"fsElement={fields.get('fsElement', '?')}",
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flush=True,
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)
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self.send_response(200)
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self.send_header("Content-Type", "image/png")
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self.send_header("Cache-Control", "no-store")
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self.send_header("Content-Length", str(len(PNG1x1)))
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self.end_headers()
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self.wfile.write(PNG1x1)
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return
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self.send_response(200)
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self.send_header("Content-Type", "text/html; charset=utf-8")
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self.send_header("Cache-Control", "no-store")
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self.send_header("Content-Length", str(len(PAGE)))
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self.end_headers()
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self.wfile.write(PAGE)
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def log_message(self, *args: object) -> None:
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"""Silence the default access log; the /d beacon above is the signal."""
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if __name__ == "__main__":
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socketserver.TCPServer.allow_reuse_address = True
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with socketserver.ThreadingTCPServer(("0.0.0.0", PORT), Handler) as httpd:
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print(f"dim-probe on http://0.0.0.0:{PORT}/ — waiting for the kiosk…", flush=True)
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try:
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httpd.serve_forever()
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except KeyboardInterrupt:
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sys.exit(0)
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