bug#66659: (home-)on-first-login script broken when no gexps are added

[Rostislav Svoboda]

> > I've just pushed something similar to what you provided, Carlo, in
> > commit e098ba2f499bbddfea50c85058e4077e39b85513.
> >
> > We should be good now.
>
> I'm afraid this did not fix the issue. It results in
> (when (claim-first-run flag-file-path) (begin))
>
> which leads to the new error message "Syntax error:
> /home/nl/.guix-home/on-first-login:3:1272: sequence of zero expressions in 
> form (begin)"

Adding *unspecified* works for me. I.e.:

    (when (claim-first-run flag-file-path)
      ;; GEXPS can be empty, hence 'begin *unspecified*'. Having just
      ;; 'begin' without '*unspecified*' leads to
      ;; "Syntax error: ... sequence of zero expressions in form (begin)"
      (begin *unspecified* #$@gexps))

The patch is in the attachment.

Cheers Bost

0001-home-services-Fix-regression-in-generated-on-first-l.patch
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