bug#24988: Guix requests substitute for non-substitutable package

[Ludovic Courtès]

Ricardo Wurmus <address@hidden> skribis:

> Guix requests a substitute for “texlive-texmf” even though it is marked
> as not substitutable.  This is a problem for many users because hydra
> does not offer a substitute for this package.  Users have to pass
> “--fallback” to make Guix build the package from source.
>
> Only the “texlive-texmf” package is marked as not substitutable.

I believe this was fixed in bdb59b331bac0dea4a75b055334313ddc7bfecc8.
Now I get:

--8<---------------cut here---------------start------------->8---
$ guix package -e '(@@ (gnu packages tex) texlive-texmf)' -n
The following package would be installed:
   texlive-texmf        2016    
/gnu/store/qnz85bcaw899rkv1bpgb0121ma5b9vzk-texlive-texmf-2016

substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 
100.0%
The following derivations would be built:
   /gnu/store/dawkcdisqbkhcdh7jnvv4riyn776il1j-profile.drv
   /gnu/store/izfgalbxmalakjwqg3dv67g4cg6i5j2h-fonts-dir.drv
   /gnu/store/3g2j8m7kfbr49277007qivx01h2mm88d-texlive-texmf-2016.drv
   /gnu/store/37ghxb96mnjamid1vqgbmlllqqd6yl6k-ca-certificate-bundle.drv
   /gnu/store/2dqinwxwg5fanbcsnxlw5rh15pgzanps-info-dir.drv
   /gnu/store/5bmwih8gdncsdxlvv1fn2az3jy55s6w1-manual-database.drv
2105.2 MB would be downloaded:
   /gnu/store/459shrba10iz1g4wqkf4y2fyiravla6v-mkfontscale-1.1.2
   /gnu/store/g7lnq940sn01iiaj1pvm72r2c29pgbp4-mkfontdir-1.0.7
   /gnu/store/y3nhc5n2misr91ydp907s50irjcssdfv-texlive-20160523b-texmf.tar.xz
[...]
--8<---------------cut here---------------end--------------->8---

Ludo’.