99 lines
3.1 KiB
Plaintext
99 lines
3.1 KiB
Plaintext
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#!/usr/bin/env python3
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"""lvx-resolve-links — create /dev/lvx6048-N symlinks keyed to PI18 serial.
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Globs /dev/hidraw*, sends PI18 `ID` to each, and creates
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/dev/lvx6048-1 -> /dev/hidrawX where X's serial matches SERIAL_UNIT_1
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/dev/lvx6048-2 -> /dev/hidrawX where X's serial matches SERIAL_UNIT_2
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Must run as root. Intended as a systemd oneshot before powermon*.service.
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Runs a single discovery pass with exclusive access — unlike powermon's native
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resolve_path which each service performs independently at startup, causing
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collisions when a sibling service is already holding the target hidraw.
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Edit SERIAL_UNIT_1 / SERIAL_UNIT_2 when a unit is replaced.
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"""
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from __future__ import annotations
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import asyncio
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import glob
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import os
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import sys
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SERIAL_UNIT_1 = "1496142109100037000000"
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SERIAL_UNIT_2 = "1496142408100255000000"
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LINK_FOR_SERIAL = {
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SERIAL_UNIT_1: "/dev/lvx6048-1",
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SERIAL_UNIT_2: "/dev/lvx6048-2",
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}
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sys.path.insert(0, "/home/noise/.local/share/uv/tools/powermon/lib/python3.11/site-packages")
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from powermon.protocols import get_protocol_definition # noqa: E402
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from powermon.ports.usbport import USBPort # noqa: E402
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async def probe_serial(path: str) -> str | None:
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proto = get_protocol_definition(protocol="PI18")
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port = USBPort(path=path, protocol=proto)
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port.path = path
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try:
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await port.connect()
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if not port.is_connected():
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return None
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cmd = proto.get_id_command()
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res = await port.send_and_receive(command=cmd)
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await port.disconnect()
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except Exception as e:
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print(f" probe {path}: {e.__class__.__name__}: {e}", file=sys.stderr)
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return None
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if res is None or not getattr(res, "is_valid", False) or not res.readings:
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return None
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return str(res.readings[0].data_value)
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def _relink(link: str, target: str) -> None:
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target_basename = os.path.basename(target)
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try:
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if os.path.islink(link) or os.path.exists(link):
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os.unlink(link)
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except FileNotFoundError:
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pass
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os.symlink(target_basename, link)
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async def main() -> int:
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candidates = sorted(glob.glob("/dev/hidraw*"))
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if not candidates:
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print("no /dev/hidraw* devices present", file=sys.stderr)
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return 1
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sn_to_path: dict[str, str] = {}
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for p in candidates:
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sn = await probe_serial(p)
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if sn:
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print(f"{p}: serial {sn}")
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sn_to_path[sn] = p
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else:
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print(f"{p}: no PI18 response (probably not an LVX6048)")
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missing = []
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for sn, link in LINK_FOR_SERIAL.items():
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if sn in sn_to_path:
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_relink(link, sn_to_path[sn])
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print(f"symlink {link} -> {os.path.basename(sn_to_path[sn])}")
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else:
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missing.append((link, sn))
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try:
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if os.path.islink(link):
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os.unlink(link)
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except FileNotFoundError:
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pass
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print(f"WARNING: {link} serial {sn} not found on any /dev/hidraw*")
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return 0 if not missing else 2
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if __name__ == "__main__":
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sys.exit(asyncio.run(main()))
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