[Buildroot] [PATCH] package/nginx: fix NGINX pidfile handling systemd

[Yann E. MORIN <yann.morin.1998@free.fr>]

Arnout, All,

On 2021-05-28 13:51 +0200, Arnout Vandecappelle spake thusly:
> On 28/05/2021 13:39, Yann E. MORIN wrote:
> > On 2021-05-27 22:49 +0200, Arnout Vandecappelle spake thusly:
> >> On 26/05/2021 22:48, Yann E. MORIN wrote:
> >>> On 2021-05-21 09:41 -0500, Matthew Weber via buildroot spake thusly:
> >>>> Upstream bug: (deferred fix)
> >>>> https://trac.nginx.org/nginx/ticket/1897?cversion=0&cnum_hist=2
> >>> So, basically, upstream refused to fix that bug [...]
> > [--SNIP--]
> >>> If so, maybe we could then tweak the unit to make use of it, instead of
> >>> the sleep workaround?
> >>  I think there was one useful comment on the Ubuntu bug [1]:
> >>>>>
> >> As far as I can tell, this daemonization is not needed for the systemd service
> >> use-case. The service should be Type=simple, and 'daemon off'. The standard file
> >> handles get redirected by systemd anyway, and non-stop upgrade cannot be used in
> >> this case either. (See:
> >> http://nginx.org/en/docs/faq/daemon_master_process_off.html )
> >> <<<
> >>  So I rather think we should go for that solution.
> > 
> > Indeed, that seems an even better solution, and probably an actual fix.
> 
>  Unfortunately, not so easy in practice. "daemon off" means a change in the
> configuration file, which is typically going to be modified by the user. Also,
> it's something that comes from nginx itself, so we'd have to patch the one that
> gets installed by nginx (and that one will probably be overwritten anyway in an
> overlay).
> 
>  Also, daemon off should only be done in systemd; sysvinit still wants nginx to
> daemonize! So it's conditional patching, and we don't like that... Well, I guess
> it can be done post-install with a sed script that inserts an aditional line at
> the beginning of the file.

Well, except for the overlay issue, it seems to be pretty easy to do;

    diff --git a/package/nginx/nginx.mk b/package/nginx/nginx.mk
    index e93e802fd3..411d686cdd 100644
    --- a/package/nginx/nginx.mk
    +++ b/package/nginx/nginx.mk
    @@ -314,6 +314,10 @@ endef
     define NGINX_INSTALL_INIT_SYSTEMD
     	$(INSTALL) -D -m 0644 package/nginx/nginx.service \
     		$(TARGET_DIR)/usr/lib/systemd/system/nginx.service
    +	mkdir -p $(TARGET_DIR)/etc/systemd/system/nginx.d
    +	$(SED) '1idaemon off;' $(TARGET_DIR)/etc/nginx.conf
    +	printf '[Service]\nType=simple\n' \
    +		>$(TARGET_DIR)/etc/systemd/system/nginx.d/buildroot-no-daemon.conf
     endef
     
     define NGINX_INSTALL_INIT_SYSV

But of course, is a user provides their daemon-using config file, they'd
be out of luck...

In the end, maybe the sleep-based workaround is just good-enough?

Regards,
Yann E. MORIN.

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