Add ledctl locate/off LED controls to drive detail modal

services/leds.py

@@ -0,0 +1,29 @@
+import asyncio
+import re
+
+
+async def set_led(device: str, state: str) -> dict:
+    """Set the locate LED on a drive via ledctl.
+
+    Args:
+        device: Block device name (e.g. "sda"). Must be alphanumeric.
+        state: "locate" to turn on the locate LED, "off" to turn it off.
+    """
+    if not re.fullmatch(r"[a-zA-Z0-9]+", device):
+        raise ValueError(f"Invalid device name: {device}")
+    if state not in ("locate", "off"):
+        raise ValueError(f"Invalid state: {state}")
+
+    proc = await asyncio.create_subprocess_exec(
+        "ledctl",
+        f"{state}=/dev/{device}",
+        stdout=asyncio.subprocess.PIPE,
+        stderr=asyncio.subprocess.PIPE,
+    )
+    stdout, stderr = await proc.communicate()
+
+    if proc.returncode != 0:
+        err = stderr.decode().strip() or stdout.decode().strip()
+        raise RuntimeError(f"ledctl failed (rc={proc.returncode}): {err}")
+
+    return {"device": device, "state": state}