#36855 'guix system switch-generation' does not reload Shepherd services

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Subject: Re: guix system switch-generation doesn't
From: Robert Vollmert <rob@vllmrt.net>
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Could we get some input on this bug?

Maybe I’m misunderstanding something, but it seems that a core guix
feature (atomic rollbacks) doesn’t work…

> On 30. Jul 2019, at 12:00, Robert Vollmert <rob@vllmrt.net> wrote:
> 
> What I see:
> 
> 1. edit ~/pzprnode/pzprnode
> 
> rob@garp ~/pzprnode$ git diff
> diff --git a/pzprnode b/pzprnode
> index 612e6a8..d8ef0ea 100755
> --- a/pzprnode
> +++ b/pzprnode
> @@ -190,5 +190,6 @@ const server = http.createServer((req, res) => {
> });
> 
> server.listen(port, hostname, () => {
> +       console.log("updated version");
>       console.log(`Server running at http://${hostname}:${port}/`);
> });
> 
> 2. sudo guix system reconfigure -L ~/garp-config ~/garp-config/config.scm
> 3. sudo herd restart pzprnode
> 4. less /var/log/messages
> 
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been stopped. 
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been started. 
> Jul 30 11:46:58 localhost pzprnode[4954]: updated version 
> Jul 30 11:46:58 localhost pzprnode[4954]: Server running at http://127.0.0.1:3456/ 
> 
> 5. sudo guix system list-generations
> 
> Generation 151	Jul 30 2019 10:37:06
> file name: /var/guix/profiles/system-151-link
> canonical file name: /gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
> Generation 152	Jul 30 2019 11:43:13	(current)
> file name: /var/guix/profiles/system-152-link
> canonical file name: /gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
> 
> 6. sudo guix system switch-generation 151
> 
> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
> The following derivation will be built:
>  /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
> building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
> switched from generation 152 to 151
> 
> 7. sudo herd restart pzprnode
> 8. less /var/log/messages
> 
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been stopped. 
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been started. 
> Jul 30 11:48:03 localhost pzprnode[4994]: updated version 
> Jul 30 11:48:03 localhost pzprnode[4994]: Server running at http://127.0.0.1:3456/ 
> 
> The line with “updated version” should not be there.
> 
> Presumably, this is due to switch-generations not calling upgrade-shepherd-services.
> 

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