The graphviz.pm plug-in currently attempts to read PNG data in UTF-8 mode, which sometimes fail with a message similar to the following (depending on the input):

utf8 "\x89" does not map to Unicode at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 53, <IN> chunk 1.
Wide character in subroutine entry at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 68.

Ok, will remove the binmode IN then. done --Joey

Thanks --HenrikBrixAndersen

It also generates image URLs relative to the page being rendered, which means the URLs wont work when previewing a graph from the CGI script.

(preview bug split to Problems with graphviz.pm plug-in previews)

Here is an updated patch againt ikiwiki-2.5:

Applied, thanks. --Joey

The patch below fixes these two issues.

--- graphviz.pm.orig    Thu Jun  7 15:45:16 2007
+++ graphviz.pm Fri Jun  8 12:03:38 2007
@@ -41,7 +41,6 @@ sub render_graph (\%) {
        $pid=open2(*IN, *OUT, "$params{prog} -Tpng");

        # open2 doesn't respect "use open ':utf8'"
-       binmode (IN, ':utf8');
        binmode (OUT, ':utf8');

        print OUT $src;
@@ -70,7 +69,12 @@ sub render_graph (\%) {
        }
    }

-   return "<img src=\"".urlto($dest, $params{page})."\" />\n";
+   if ($params{preview}) {
+       return "<img src=\"".urlto($dest, "")."\" />\n";
+   }
+   else {
+       return "<img src=\"".urlto($dest, $params{page})."\" />\n";
+   }
 }

 sub graph (@) {