Re: Run a system command in home configuration file

[Efraim Flashner <efraim@flashner.co.il>]

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On Tue, Mar 08, 2022 at 03:38:19PM +0100, Reza Housseini wrote:
> 
> 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.
> > 
> 
> 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?
> 

One option is a one-off shepherd service. For finding the
SSH_AUTH_SOCKET using gpgconf I stuck with the tried and true method of
setting it in .bash_profile¹.

¹ https://git.sr.ht/~efraim/guix-config/tree/master/item/efraim-home.scm#L694

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