bug#23666: guix download fails for large files

[Leo Famulari]

On Tue, May 31, 2016 at 09:56:31PM +0200, Andreas Enge wrote:
> since I am regularly rebuilding texlive (who is not!), I would like to keep
> the source tarball on my machine, and whenever I garbage collect it from the
> store, add it back via
>    guix download file:texlive-20150523-texmf.tar.xz
>
> On my Novena with a 32 bit processor and 4 GB of main memory, this fails with
>    guix download: error: sendfile: Broken pipe
> 
> The file itself has 1,8 GB.
> 
> Downloading the file via http as part of "guix build" works, and
> "guix download file:" also works on my x86_64 machine with 8 GB of RAM.

As a temporary workaround, you could make the tarball a gcroot:

# ln -sf /gnu/store/...-texlive-20150523-texmf.tar.xz \
/var/guix/gcroots/texlive-texmf.tar.xz