deploy: version systemd runtime setup

deploy/systemd/bin/metin-game-instance-start.in

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+instance="${1:?missing instance name}"
+root_dir="{{RUNTIME_ROOT}}/channels"
+channel_dir="${instance%_*}"
+core_dir="${instance##*_}"
+workdir="${root_dir}/${channel_dir}/${core_dir}"
+binary="./${instance}"
+
+if [ ! -d "$workdir" ]; then
+  echo "Missing workdir for instance ${instance}: ${workdir}" >&2
+  exit 1
+fi
+
+cd "$workdir"
+
+if [ ! -x "$binary" ]; then
+  echo "Missing executable for instance ${instance}: ${workdir}/${instance}" >&2
+  exit 1
+fi
+
+exec "$binary"

deploy/systemd/bin/metin-wait-port

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+import socket
+import sys
+import time
+
+
+def main() -> int:
+    if len(sys.argv) < 3:
+        print("usage: metin-wait-port <host> <port> [timeout_secs]", file=sys.stderr)
+        return 2
+
+    host = sys.argv[1]
+    port = int(sys.argv[2])
+    timeout_secs = float(sys.argv[3]) if len(sys.argv) > 3 else 30.0
+    deadline = time.monotonic() + timeout_secs
+
+    while time.monotonic() < deadline:
+        try:
+            with socket.create_connection((host, port), timeout=0.5):
+                return 0
+        except OSError:
+            time.sleep(0.2)
+
+    print(f"Timed out waiting for {host}:{port}", file=sys.stderr)
+    return 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())