inkscape: openclipart integration is broken

[bjornfor]

Issue description

Inkscape has support for openclipart but it doesn't work in the package provided by nixpkgs.

Steps to reproduce

1. Start inkscape
2. Go to File -> Import Clip Art...
3. Enter a search term and click the Search button.
4. See the Could not connect to the Open Clip Art in the GUI and

** (inkscape:19026): WARNING **: 14:25:09.396: ImportDialog::on_xml_file_read():
	Failed to retrieve 'http://openclipart.org/media/feed/rss/car'
	TLS support is not available

in the terminal.

Technical details

NixOS 18.09 and nixpkgs master.

[bjornfor]

I researched a bit and thought adding glib-networking would fix it. I wrote the following patch, but it doesn't seem to have any effect:

diff --git a/pkgs/applications/graphics/inkscape/default.nix b/pkgs/applications/graphics/inkscape/default.nix
index 01243f6bdee..9821b02f48c 100644
--- a/pkgs/applications/graphics/inkscape/default.nix
+++ b/pkgs/applications/graphics/inkscape/default.nix
@@ -3,6 +3,7 @@
 , glibmm, libsigcxx, lcms, boost, gettext
 , gsl, python2, poppler, imagemagick, libwpg, librevenge
 , libvisio, libcdr, libexif, potrace, cmake, hicolor-icon-theme
+, glib-networking, wrapGAppsHook
 }:
 
 let
@@ -40,13 +41,13 @@ stdenv.mkDerivation rec {
       --replace '"python-interpreter", "python"' '"python-interpreter", "${python2Env}/bin/python"'
   '';
 
-  nativeBuildInputs = [ pkgconfig cmake python2Env ]
+  nativeBuildInputs = [ pkgconfig cmake python2Env wrapGAppsHook ]
     ++ (with perlPackages; [ perl XMLParser ]);
   buildInputs = [
     libXft libpng zlib popt boehmgc
     libxml2 libxslt glib gtkmm2 glibmm libsigcxx lcms boost gettext
     gsl poppler imagemagick libwpg librevenge
-    libvisio libcdr libexif potrace hicolor-icon-theme
+    libvisio libcdr libexif potrace hicolor-icon-theme glib-networking
 
     python2Env perlPackages.perl
   ];

[FRidh]

I wonder whether it really is because TLS support is unavailable, or because openclipart.org uses an invalid security certificate?

[bjornfor]

Good point.

Hm, that's weird. I followed that URL (http://openclipart.org/media/feed/rss/car) a day or two ago (when I first noticed this) and was redirected to https:// without problems. But now I see the certificate warning in firefox.

[bjornfor]

I think it may be a packaging bug after all. Look at this grep:

$ grep -rn -exclude="*.po" "TLS support is not available" glib-2.58.1/ glib-networking-2.58.0/
glib-2.58.1/gio/gdummytlsbackend.c:195:		       _("TLS support is not available"));
glib-2.58.1/gio/gdummytlsbackend.c:317:		       _("TLS support is not available"));
glib-2.58.1/gio/gdummytlsbackend.c:419:                       _("DTLS support is not available"));
glib-2.58.1/gio/gdummytlsbackend.c:509:                       _("TLS support is not available"));

The message only appears in the glib tree, in the gdummytlsbackend.c file. No matches from glib-networking, which AFAIK, provides TLS support.

[jtojnar]

I tried the patch and am getting

** (inkscape:11980): WARNING **: 20:52:11.251: ImportDialog::on_xml_file_read():
	Failed to retrieve 'http://openclipart.org/media/feed/rss/hello'
	Operation not supported

Probably because the site is down.

[bjornfor]

https://openclipart.org/ is not down for me.

[bjornfor]

@jtojnar: Thank you!