Re: More robust substitute*

[ludo@gnu.org (Ludovic Courtès)]

Hello!

Andreas Enge <andreas@enge.fr> skribis:

> Am Samstag, 2. Februar 2013 schrieb Ludovic Courtès:
>> Andreas Enge <andreas@enge.fr> skribis:
>> > in texlive, there are lots of scripts to be installed in share; thus,
>> > the patch-shebang phase does not catch them.
>> Do you know why it doesn’t catch them?  The ‘patch-source-shebangs’
>> phase patches all the files found under “.”, recursively.
>
> I am not speaking about patch-source-shebangs, but patch-shebangs.

Ah right, the ‘patch-shebangs’ phase just looks at files in ‘bin’ and
‘sbin’ (see gnu-build-system.scm).

Perhaps you can add a phase somewhere that does along the lines of:

  (lambda* (#:key outputs #:allow-other-keys)
    (for-each (match-lambda
                ((_ . dir)
                 (for-each patch-shebang
                           (find-files (string-append dir "/share")
                                       ".*"))))
              outputs)
    #t)

> In any case, I have a working texlive! It contains over 100000 files (that 
> are symlinked from the user profile...) and takes over 3GB, but it works!

Woow, congratulations!  :-)

I’m not sure if that would help here, but do you know about
“multiple-output derivations”?  It’s used for Libtool for instance: the
‘outputs’ field there means that binaries go into one directory, and the
rest goes into another directory (you see them when typing ‘guix-build
libtool’).

So if there are several kinds of files, you may want to separate them in
different outputs.

> Actually, I think one does not need to symlink the files from the user 
> profile; tex has its own way of finding files via the binary "kpsewhich" 
> (linked from the user profile), which points directly to the nix store:
> $ kpsewhich article.sty
> /nix/store/2cc4xyivn5f52gywl5mnz6fi90bj24xh-texlive-2012/share/texmf-
> dist/tex/latex/base/article.sty
>
> So maybe by splitting into two or three packages, one could hide the data 
> in the nix store. I will think about it.

Hmm, intriguing.  :-)

Thanks!

Ludo’, coming back from FOSDEM.