[bug#52731] [PATCH] import: texlive: Check if Subversion is installed.

[Xinglu Chen <public@yoctocell.xyz>]

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Am Mittwoch, der 22. Dezember 2021, um 12:50 +01, schrieb Liliana Marie Prikler:

> Am Mittwoch, dem 22.12.2021 um 10:01 +0100 schrieb Xinglu Chen:
>> Exit with a friendlier error message instead of throwing throwing a
>> “failed with
>> signal 11” error if ‘svn’ isn’t in the user’s PATH.
>> 
>>   $ guix import texlive getmap
>>   command "svn" "export" "--non-interactive" "--trust-server-cert" "-
>> r" "59745"
>> "svn://
>> www.tug.org/texlive/tags/texlive-2021.3/Master/texmf-dist/doc/latex/getmap/
>> " "/tmp/guix-directory.YgfGgo/doc/latex/getmap/" failed with signal
>> 11
> Shouldn't we use a guix-built svn here (as in svn-fetch)?

Which ‘svn-fetch’ are you referring to (there are two AFAICS)?  The
Texlive importer uses ‘download-multi-svn-to-store’, which itself uses
‘svn-fetch’ from (guix build svn), but it requires the ‘svn’ program to
be in PATH.

There is another ‘svn-fetch’ procedure, in (guix svn-download), but that
one returns a fixed-output derivation, so it can only be used if we
already know the hash (which we don’t, that’s why we are fetching the
SVN repo).

Importers that fetch a Git repo don’t need ‘git’ to be in PATH since
they use the Guile-Git bindings to libgit2.  But we don’t have Guile
bindings to SVN (or Hg, CVS, Bzr), so the program has to be installed on
the host system.

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