Created attachment 217968 [details]
Minimal working example PDF and source

I've included a minimum working example of the problem. It occurred when I was trying to embed an auxiliary file within a PDF using the attachfile2 package of the LaTeX distribution. The included PDF was generated with the sequence

    xelatex minimal
    pdfatfi minimal
    xelatex minimal

Then when the PDF is opened with Evince and the annotation link is clicked, instead of opening the attached file (here, the Evince icon SVG), the error messages


    (evince:9550): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
    
    (evince:9550): EvinceView-WARNING **: Failed to create a temporary file: No such file or directory

are shown instead.

After recompiling Evince with debugging enabled, I was able to determine that the problem was occurring because of the embedded file's name. Note that the embedded file is contained within a subdirectory; apparently the attachfile2 package uses the whole relative path where the file is sourced from as the annotation's file name, so when Evince goes to create a temporary file, the file cannot be opened since the parent directory does not exist (so in this case, /tmp/attachment/icons.svg.XXXX can't be opended).

The attached patch fixes this problem by first extracting the basename from the attachment's name before trying to generate a temporary file. Arguably, this issue should also be resolved in the attachfile2 (or {pdf,xe}latex engines), but Evince should still attempt to function given less than ideal inputs.