bug#22039: [PATCH] 'guix system reconfigure' must start/restart/stop services

[Carlo Zancanaro]

On Sun, Sep 02 2018, Ludovic Courtès wrote:
> First, could you check (in a VM) whether the boot failure is 
> reproducible when that patch that removes ‘EINTR-safe’ is 
> applied?

As far as I can tell it's completely reproducible.

> If it’s 100% reproducible, could you share the VM’s output?

Sure. It's attached.

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> Indeed.  In addition, some low-level services such as file 
> system mounts cannot be restarted without rebooting, so it’s not 
> useful to mention them.  Perhaps we should simply print (1) the 
> list of services that were restarted, and (2) a message saying 
> that users should explicitly run “herd restart SERVICE” to 
> upgrade other services.
>
> WDYT?

If there are services that must never be restarted, then maybe we 
don't want to indiscriminately print out a message to restart 
everything. We need some way to mark services that must not be 
restarted. If that's the case, then we might as well just 
automatically restart the services that we can rather than 
printing a message saying to do so. What do we gain by adding an 
extra step to that process?

Carlo

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