Re: Run a system command in home configuration file

[Reza Housseini <reza.housseini@gmail.com>]

On 3/8/22 11:33, Ludovic Courtès wrote:
> Hi,
>
> Reza Housseini <reza.housseini@gmail.com> skribis:
>
>> I want to run a system command and use the output inside my ssh config
>> file. Below is the service configuration I'm talking about and my current
>> implementation which does not work, probably because the command is run
>> from the daemon, but I need it to run from the current user. Has anyone an
>> idea how to achieve this?
>>
>> (simple-service 'ssh-config
>>   home-files-service-type
>>   (list `("ssh/config"
>>   ,(mixed-text-file "config" "
>> Host *
>>    IdentityAgent " #~(system* #$(file-append gnupg "/bin/gpgconf")
>> "--list-dirs" "agent-ssh-socket")"
>> "))))
> Instead of #~(system* …) above, you could do something like:
>
>    (let* ((pipe (open-input-pipe "gpgconf" …))
>           (data (get-string-all pipe)))
>      (close-pipe pipe)
>      data)
>
> The effect will be that ‘gpgconf’ will run when you invoke ‘guix system
> reconfigure’, as the user who invokes it.  (You need the (ice-9 popen)
> and (rnrs io bytevectors) modules.)
>
> I can’t necessarily recommend it because it’s kinda wild, but it should
> do the trick.
>
> HTH,
> Ludo’.


Hi Ludo

Thanks for the reply, it really looks kinda wild :)

Isn't there a general need to run certain commands for  specific user 
especially in the context of guix home?

Cheers,

Reza