GNU bug report logs - #78758
shepherd: 'herd graph' shows root node

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: burban <at> opopop.net
To: bug-guix <at> gnu.org
Subject: shepherd: herd graph issue
Date: Tue, 10 Jun 2025 20:03:30 +0000

Hello,

I noticed that "herd graph" always creates a link to root, which IMO
clobbers the picture (I can send pictures if that is allowed on this
list or their source)

This is due to these lines in herd.scm (around line 782):

                          (if (memq 'root (live-service-provision service))
                              (live-service-requirement service)
                              (cons 'root (live-service-requirement service)))))

The line (live-service-requirement service) is enough to produce
an understandable dependency graph.

Sincerely.

-- 

Bernard

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: burban--- via Bug reports for GNU Guix <bug-guix <at> gnu.org>
Cc: 78758 <at> debbugs.gnu.org, burban <at> opopop.net
Subject: Re: bug#78758: shepherd: herd graph issue
Date: Sat, 14 Jun 2025 00:50:04 +0200

Hi,

burban--- via Bug reports for GNU Guix <bug-guix <at> gnu.org> writes:

> I noticed that "herd graph" always creates a link to root, which IMO
> clobbers the picture (I can send pictures if that is allowed on this
> list or their source)

Yeah I wondered about that at the time but found that not having a clear
source node on the graph looked weird (and inaccurate).

So hmm, I don’t know!

Ludo’.

Message #16 received at 78758 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: burban <at> opopop.net
Cc: 78758 <at> debbugs.gnu.org
Subject: Re: bug#78758: shepherd: herd graph issue
Date: Sun, 15 Jun 2025 00:19:07 +0200

Hi,

burban <at> opopop.net writes:

> It would perhaps make everyone happy to add the root service in the
> graph only if #:requirement is empty.

I think it would be confusing.  It should either always show the ‘root’
node, or never show it.

Ludo’.

Message #19 received at 78758 <at> debbugs.gnu.org (full text, mbox):

From: burban <at> opopop.net
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 78758 <at> debbugs.gnu.org
Subject: Re: bug#78758: shepherd: herd graph issue
Date: Sat, 14 Jun 2025 19:23:57 +0000

Hello,

My remark was in the context of booting, where a service depends always
on some #:requirement (file systems mounted, udev present etc...),
and transitiveley to an ultimate ancestor (which #:requirement
I force to be root, may be this isn't necessary)

If you run shepherd for user services, it makes sense to have
#:requirement empty.

It would perhaps make everyone happy to add the root service in the
graph only if #:requirement is empty.

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

> Hi,
>
> burban--- via Bug reports for GNU Guix <bug-guix <at> gnu.org> writes:
>
>> I noticed that "herd graph" always creates a link to root, which IMO
>> clobbers the picture (I can send pictures if that is allowed on this
>> list or their source)
>
> Yeah I wondered about that at the time but found that not having a clear
> source node on the graph looked weird (and inaccurate).
>
> So hmm, I don’t know!
>
> Ludo’.

Sincerely.

--

Bernard

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