guix import texlive fails because of svn

[Matthew Leach <matthew@mattleach.net>]

Hi Guix,

I'm trying to import a texlive package with the command: `guix import
texlive savetrees'.  I get the following output:

--8<---------------cut here---------------start------------->8---
following redirection to `https://ctan.org/xml/1.2/pkg/savetrees'...
Backtrace:
          11 (primitive-load "/home/matthew/.config/guix/current/bin…")
In guix/ui.scm:
  1806:12 10 (run-guix-command _ . _)
In guix/scripts/import.scm:
   116:11  9 (guix-import . _)
In guix/scripts/import/texlive.scm:
    91:19  8 (guix-import-texlive . _)
In guix/memoization.scm:
     98:0  7 (_ #<hash-table 7fd23756dfe0 0/31> ("savetrees" "lat…") _)
In unknown file:
           6 (_ #<procedure 7fd237593e80 at guix/memoization.scm:17…> …)
In guix/store.scm:
   625:10  5 (call-with-store #<procedure 7fd2375c0060 at guix/impor…>)
In guix/import/texlive.scm:
   148:23  4 (_ #<store-connection 256.99 7fd237de1960>)
In guix/utils.scm:
    661:8  3 (call-with-temporary-directory #<procedure 7fd2364e1420…>)
In guix/svn-download.scm:
   160:14  2 (_ "/tmp/guix-directory.FEVjRH")
In guix/build/svn.scm:
     39:2  1 (svn-fetch _ _ _ #:svn-command _ #:recursive? _ # _ # _)
In guix/build/utils.scm:
    652:6  0 (invoke _ . _)

guix/build/utils.scm:652:6: In procedure invoke:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: "svn" arguments: ("export" "--non-interactive" "--trust-server-cert" "-r" "49435" "svn://www.tug.org/texlive/tags/texlive-2018.2/Master/texmf-dist/source/latex/savetrees" "/tmp/guix-directory.FEVjRH") exit-status: 1 term-signal: #f stop-signal: #f] 7fd2360bbe40>)'.
--8<---------------cut here---------------end--------------->8---

I have subversion installed and when I try to execute the subversion
command manutally it succeeds:

--8<---------------cut here---------------start------------->8---
matthew@picard ~ $ svn export --non-interactive --trust-server-cert -r 49435 svn://www.tug.org/texlive/tags/texlive-2018.2/Master/texmf-dist/source/latex/savetrees /tmp/foobar
A    /tmp/foobar
A    /tmp/foobar/savetrees.dtx
A    /tmp/foobar/savetrees.ins
Exported revision 49435.
--8<---------------cut here---------------end--------------->8---

Am I doing something wrong or is this a bug?

Regards,
-- 
Matt