From c77c1572f0eb79720d78ab20b173a76bf356d407 Mon Sep 17 00:00:00 2001 From: Donald Buczek Date: Mon, 7 Jan 2019 10:24:27 +0100 Subject: [PATCH] blinkd: Use system python This is the second part of the blinkd fix (issue #54). PR #64 prevented the deadlock during service start. However, currently blinkd is not starting at system boot, because it uses `env python3` in the shebang. This will activate our default (big, scientific) python3 which is located in /pkg and depends on the automounter. One solution to this problem would be to add After=automount.service to blinkd.service. This would delay the startup of blinkd to the point, when automounter has finished startup. However, experiments showed, that this doesn't work. It looks like the startup command of automount.service exists after daemon process has been forked but before the automount paths have been mounted. So systemd regards automount.service has started before the automount paths are really available and services with After=automount.service are still started to early to use them. That aside, although /usr/bin/python3 does not to go via NFS under normal circumstances because of the local mechanism of mxpkg, under expectional circumstances this can happen (e.g. when the python3 version is updates). We don't want long-running deamons to lock nfs mounts, so this would not be a good solution, even if made to work. A python3 with the blink1 package from PyPi has been added to the system [1] and is available as /usr/local/system/python3/bin/python3. This python3 installation is guaranteed to be on a local disk, so use this path in the shebang. [1] https://github.molgen.mpg.de/mariux64/pkg-scripts/commit/8e149c1fd114e75479dae3338711891e04b0e6fa --- blink/blinkd.py | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/blink/blinkd.py b/blink/blinkd.py index 6df6bd3b..a4fa731d 100755 --- a/blink/blinkd.py +++ b/blink/blinkd.py @@ -1,5 +1,4 @@ -#!/usr/bin/env python3 - +#! /usr/local/system/python3/bin/python3 from blink1.blink1 import Blink1, Blink1ConnectionFailed from multiprocessing import cpu_count