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Subject: bug#30706: Nginx service fails
Resent-From: Andreas Enge <andreas@HIDDEN>
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Date: Mon, 5 Mar 2018 00:06:37 +0100
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Well, I am turning this into a bug report, since it still occurs with
the latest git commit ac1a9ce8b07f3b80900ee08436ff6e683e8dc195 .

This is the result of "./pre-inst-env guix system reconfigure ...",
where "..." is my configuration file:

...
creating nginx log directory '/var/log/nginx'
creating nginx run directory '/var/run/nginx'
creating nginx temp directories '/var/run/nginx/{client_body,proxy,fastcgi,uwsgi,scgi}_temp'
nginx: [alert] could not open error log file: open() "/gnu/store/pp71iff1qxwhh82vm34g18h9kmn0xrg5-nginx-1.13.9/logs/error.log" failed (2: No such file or directory)
nginx: the configuration file /gnu/store/5ixkryw6jl32cm6d1g9jb8dm9rbz8csc-nginx.conf syntax is ok
nginx: configuration file /gnu/store/5ixkryw6jl32cm6d1g9jb8dm9rbz8csc-nginx.conf test is successful
`/gnu/store/zchh8s3r1bbmia3zfxsyhsz3c4b9fmps-openssh-authorized-keys/root' -> `/etc/ssh/authorized_keys.d/root'
`/gnu/store/zchh8s3r1bbmia3zfxsyhsz3c4b9fmps-openssh-authorized-keys/andreas' -> `/etc/ssh/authorized_keys.d/andreas'
guix system: loading new services: user-homes term-auto nginx...
shepherd: Evaluating user expression (register-services (primitive-load "/gnu/st?") ?).
guix system: error: exception caught while executing 'eval' on service 'root':
find-long-options: unbound variable
Installing for i386-pc platform.
/gnu/store/1dnbfda2p1bxwyl0rcm96ka9pmi0wb88-grub-2.02/sbin/grub-install: warning: disk does not exist, so falling back to partition device /dev/xvda2.
/gnu/store/1dnbfda2p1bxwyl0rcm96ka9pmi0wb88-grub-2.02/sbin/grub-install: warning: disk does not exist, so falling back to partition device /dev/xvda2.
/gnu/store/1dnbfda2p1bxwyl0rcm96ka9pmi0wb88-grub-2.02/sbin/grub-install: warning: disk does not exist, so falling back to partition device /dev/xvda2.
/gnu/store/1dnbfda2p1bxwyl0rcm96ka9pmi0wb88-grub-2.02/sbin/grub-install: error: cannot find a GRUB drive for /dev/sda.  Check your device.map.
guix system: error: failed to install bootloader /gnu/store/9iv63jm07klxvrr4fpwv6q5vpnca13ja-bootloader-installer

The final error is "normal", since I am installing in a Xen virtual machine,
where /dev/sda does not exist; it did not matter before.
The real error occurs above, the "uncaught exception".

But:
# herd status nginx
herd: service 'nginx' could not be found

Then I do a
# ./pre-inst-env guix system roll-back
# herd status nginx
herd: service 'nginx' could not be found

Otherwise said, I can go back, but my previously running web server has
definitely gone! How do I get it back?

Andreas

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To: Andreas Enge <andreas@HIDDEN>
Subject: bug#30706: Acknowledgement (Nginx service fails)
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Subject: bug#30706: Nginx service fails
Resent-From: Ricardo Wurmus <rekado@HIDDEN>
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From: Ricardo Wurmus <rekado@HIDDEN>
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Date: Mon, 05 Mar 2018 08:23:18 +0100
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Andreas Enge <andreas@HIDDEN> writes:

> Well, I am turning this into a bug report, since it still occurs with
> the latest git commit ac1a9ce8b07f3b80900ee08436ff6e683e8dc195 .
>
> This is the result of "./pre-inst-env guix system reconfigure ...",
> where "..." is my configuration file:
>
> ...
> creating nginx log directory '/var/log/nginx'
> creating nginx run directory '/var/run/nginx'
> creating nginx temp directories '/var/run/nginx/{client_body,proxy,fastcgi,uwsgi,scgi}_temp'
> nginx: [alert] could not open error log file: open() "/gnu/store/pp71iff1qxwhh82vm34g18h9kmn0xrg5-nginx-1.13.9/logs/error.log" failed (2: No such file or directory)
> nginx: the configuration file /gnu/store/5ixkryw6jl32cm6d1g9jb8dm9rbz8csc-nginx.conf syntax is ok
> nginx: configuration file /gnu/store/5ixkryw6jl32cm6d1g9jb8dm9rbz8csc-nginx.conf test is successful
> `/gnu/store/zchh8s3r1bbmia3zfxsyhsz3c4b9fmps-openssh-authorized-keys/root' -> `/etc/ssh/authorized_keys.d/root'
> `/gnu/store/zchh8s3r1bbmia3zfxsyhsz3c4b9fmps-openssh-authorized-keys/andreas' -> `/etc/ssh/authorized_keys.d/andreas'
> guix system: loading new services: user-homes term-auto nginx...
> shepherd: Evaluating user expression (register-services (primitive-load "/gnu/st?") ?).
> guix system: error: exception caught while executing 'eval' on service 'root':
> find-long-options: unbound variable

I had the same error when updating my i686 netbook after a long while.
After a reboot everything seemed to be fine, though.

--
Ricardo

GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
https://elephly.net

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Subject: bug#30706: Nginx service fails
Resent-From: Andreas Enge <andreas@HIDDEN>
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To: Ricardo Wurmus <rekado@HIDDEN>
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Date: Mon, 5 Mar 2018 08:43:24 +0100
From: Andreas Enge <andreas@HIDDEN>
Message-ID: <20180305074324.GA7822@jurong>
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On Mon, Mar 05, 2018 at 08:23:18AM +0100, Ricardo Wurmus wrote:
> I had the same error when updating my i686 netbook after a long while.
> After a reboot everything seemed to be fine, though.

Ah, thanks for the information! A reboot made things worse in my case -
I rebooted the virtual machine, and now I cannot ssh into it any more.
So it looks like I will have to set it up from scratch again...

In my case, the problem occurred between February 28 and March 4.

Andreas

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Andreas Enge <andreas@HIDDEN> skribis:

> guix system: loading new services: user-homes term-auto nginx...
> shepherd: Evaluating user expression (register-services (primitive-load "=
/gnu/st?") ?).
> guix system: error: exception caught while executing 'eval' on service 'r=
oot':
> find-long-options: unbound variable

The problem we have here is that the agetty service expects
=E2=80=98find-long-options=E2=80=99 from linux-boot.scm, and it expects it =
at the top
level.

So what happens above is that we evaluate in PID=C2=A01 code like:

  (make <service>
    ;; =E2=80=A6
    #:start (let ((tty =E2=80=A6 (find-long-options =E2=80=A6) =E2=80=A6))
               =E2=80=A6))

If you run this on an =E2=80=9Cold=E2=80=9D GuixSD, =E2=80=98find-long-opti=
ons=E2=80=99 is undefined.

Thus the whole (register-services =E2=80=A6) expression fails to evaluate, =
and
we end up with some of the services missing.

Conclusions:

  1. =E2=80=98guix system reconfigure=E2=80=99 should probably register ser=
vices one by
     one so that if one of the service expressions is erroneous, we
     don=E2=80=99t bork everything.  See =E2=80=98upgrade-shepherd-services=
=E2=80=99.

  2. IWBN to delay execution of this whole default-tty thing to the
     #:start method.  Ideas, Danny?

In general we should do as little as possible at the top level in the
Shepherd config file.

Ludo=E2=80=99.

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Hi Ludo,

> If you run this on an =E2=80=9Cold=E2=80=9D GuixSD, =E2=80=98find-long-op=
tions=E2=80=99 is undefined.

How can it be that (gnu services base) with find-long-options call is prese=
nt
but the (gnu build linux-boot)'s find-long options isn't present?

Aren't they either both added by "guix system reconfigure" (or both removed=
)?

Also when selecting an old generation in the Grub boot menu, isn't both
(gnu build linux-boot) and (gnu services base) at the same generation when
starting up the service (as opposed to stopping the old service)?

>   1. =E2=80=98guix system reconfigure=E2=80=99 should probably register s=
ervices one by
>      one so that if one of the service expressions is erroneous, we
>      don=E2=80=99t bork everything.  See =E2=80=98upgrade-shepherd-servic=
es=E2=80=99.

Yes please.

>   2. IWBN to delay execution of this whole default-tty thing to the
>      #:start method.  Ideas, Danny?

The idea was that if you specify a serial console at boot that you can
actually log in at that console.

So it's trying to find out whether, at the time of service start,
there is a serial console specified (in the Linux command line), and if
so, start an agetty.  Otherwise do not start that agetty.

We could also do that without a guix service - but I thought it would be
nice to have a guix service for it as well.

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retitle 30706 'guix system reconfigure' can fail to load new system services

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severity 30706 important

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To: Danny Milosavljevic <dannym@HIDDEN>
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From: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <20180304222749.GA23799@jurong> <20180304230637.GA24077@jurong>
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Heya,

Danny Milosavljevic <dannym@HIDDEN> skribis:

>> If you run this on an =E2=80=9Cold=E2=80=9D GuixSD, =E2=80=98find-long-o=
ptions=E2=80=99 is undefined.
>
> How can it be that (gnu services base) with find-long-options call is pre=
sent
> but the (gnu build linux-boot)'s find-long options isn't present?

The service-upgrade code loads new service definitions in PID=C2=A01.
However, it does not force a reload of already-loaded modules.

What happens here is that (gnu build linux-boot), the one without
=E2=80=98find-long-options=E2=80=99, is already available in PID=C2=A01.  T=
hus, when end up
using that one, which lacks =E2=80=98find-long-options=E2=80=99.

We could call =E2=80=98reload-module=E2=80=99, but that=E2=80=99s probably =
not a great idea as
it could cause breakage in previously-loaded code in PID=C2=A01.  So I think
the current approach is the safest, and breakage of this sort should be
quite rare; we should pay attention to such issues, though, and try hard
to avoid them.

(Note that there=E2=80=99s no problem once you reboot, of course.)

>>   1. =E2=80=98guix system reconfigure=E2=80=99 should probably register =
services one by
>>      one so that if one of the service expressions is erroneous, we
>>      don=E2=80=99t bork everything.  See =E2=80=98upgrade-shepherd-servi=
ces=E2=80=99.
>
> Yes please.
>
>>   2. IWBN to delay execution of this whole default-tty thing to the
>>      #:start method.  Ideas, Danny?
>
> The idea was that if you specify a serial console at boot that you can
> actually log in at that console.
>
> So it's trying to find out whether, at the time of service start,
> there is a serial console specified (in the Linux command line), and if
> so, start an agetty.  Otherwise do not start that agetty.
>
> We could also do that without a guix service - but I thought it would be
> nice to have a guix service for it as well.

I agree.  I think what you did in
c32e3ddedd103318ca3f0a4bf0c91c91e2517806 is good.  The effect here is
just that agetty would fail to start upon reconfigure, but that=E2=80=99s an
acceptable limitation IMO.

Thanks,
Ludo=E2=80=99.

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