GNU bug report logs - #76811
[PATCH] services: nginx: Replace invoke with spawn-command.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Christopher Baines <mail <at> cbaines.net>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#76811: closed ([PATCH] services: nginx: Replace invoke with
 spawn-command.)
Date: Fri, 07 Mar 2025 17:19:02 +0000

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Your message dated Fri, 07 Mar 2025 17:18:52 +0000
with message-id <87v7skn4hv.fsf <at> cbaines.net>
and subject line Re: [bug#76811] [PATCH] services: nginx: Replace invoke with spawn-command.
has caused the debbugs.gnu.org bug report #76811,
regarding [PATCH] services: nginx: Replace invoke with spawn-command.
to be marked as done.

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From: Christopher Baines <mail <at> cbaines.net>
To: guix-patches <at> gnu.org
Subject: [PATCH] services: nginx: Replace invoke with spawn-command.
Date: Fri,  7 Mar 2025 13:02:15 +0000

I'm not sure where invoke is coming from here, but it could be from (guix
build utils), that uses system* which uses waitpid, which might cause problems
with recent versions of the shepherd?

At least I'm seeing issues on multiple machines where attempting to restart
the nginx service sometimes causes the shepherd to hang.

* gnu/services/web.scm (nginx-shepherd-service): Replace invoke with
spawn-command.

Change-Id: Ie9ce4be9a4df121465b28148612b4fbc45fb5126
---
 gnu/services/web.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index 7593cd2eaa..b46a4db73f 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -870,7 +870,8 @@ (define (nginx-shepherd-service config)
           (nginx-action
            (lambda args
              #~(lambda _
-                 (invoke #$nginx-binary "-c" #$config-file #$@args)
+                 (spawn-command
+                  (list #$nginx-binary "-c" #$config-file #$@args))
                  (match '#$args
                    (("-s" . _) #t)
                    (_

base-commit: 9bc4c9f521caab8aa8d88aa948a650945bb55838
-- 
2.48.1

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From: Christopher Baines <mail <at> cbaines.net>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 76811-close <at> debbugs.gnu.org
Subject: Re: [bug#76811] [PATCH] services: nginx: Replace invoke with
 spawn-command.
Date: Fri, 07 Mar 2025 17:18:52 +0000

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Ludovic Courtès <ludo <at> gnu.org> writes:

> Christopher Baines <mail <at> cbaines.net> skribis:
>
>> I'm not sure where invoke is coming from here, but it could be from (guix
>> build utils), that uses system* which uses waitpid, which might cause problems
>> with recent versions of the shepherd?
>>
>> At least I'm seeing issues on multiple machines where attempting to restart
>> the nginx service sometimes causes the shepherd to hang.
>>
>> * gnu/services/web.scm (nginx-shepherd-service): Replace invoke with
>> spawn-command.
>>
>> Change-Id: Ie9ce4be9a4df121465b28148612b4fbc45fb5126
>
> Hi!  ‘invoke’ uses ‘system*’, which is an alias for ‘spawn-command’ (see
> ‘replace-core-bindings!’ in ‘shepherd.scm’) so the only effect of this
> patch is that errors from “nginx -c nginx.conf …” would be ignored.

Ah, yes, I see, I've tried to verify this and it does seem that the
nginx server is using this system* replacement.

> I think we need a reproducer for the hang so we can pinpoint the
> problem because it’s a pretty serious bug!

I did try restarting nginx over and over again in the system test os,
but that seemed to work.

On a VM I have though, it only takes a few restarts for it to hang, I'm
not sure why though.

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