I can't add any attachment to my wiki. When I select file using "Browse" button and click "Upload Attachment", then ikiwiki.cgi file displays the error message like below:

Błąd: failed to get filehandle

Can you do some debugging? If you edit attachment.pm line 136, to print out what it did get, and show me what that yields, maybe I can figure this out.

error("failed to get filehandle ($fh)");

Sure. I've done the change and it seems that $fh variable is undefined:

Use of uninitialized value in concatenation (.) or string at /usr/share/perl5/IkiWiki/Plugin/attachment.pm line 135.
failed to get filehandle ()

Also, what web server and version of perl is this? --Joey

It's Apache2 2.2.8-1ubuntu0.3 and Perl 5.8.8-12 from Ubuntu Hardy. --Paweł

Hmm, is your CGI.pm perhaps creating the attachment temp file, but not providing an open filehandle to it via the upload method? Change the debugging line to this: --Joey

error("failed to get filehandle:$fh ; file:$filename ; is ref:".ref($q->param('attachment')));

Now my Ikiwiki returns:

failed to get filehandle: ; file:sandbox/test.txt ; is ref:

Is it helpful for you? --Paweł

Yes, this suggests that CGI.pm's upload function is not working, but that it is returning a filehandle pointing at the attachment using the old method. Hmm, so I'll bet you have a CGI.pm version older than 2.47. Can you find your system's CGI.pm and grep for "VERSION" in it to determine the version? I checked debian stable. and its perl 5.8.8 has version 3.15, so is not affected, I think.

I have CGI.pm 3.15 too:

$ grep VERSION= /usr/share/perl/5.8.8/CGI.pm
$CGI::VERSION='3.15';

I've just checked in a fix that should work, can you test it? 71f10579c00a8ddc20ada1a1efd33aac25a3da7e --Joey

I've patched attachment.pm module, but the bug still occurs. However I can see a little progress. I changed invoking error() subroutine like you showed me before and now Ikiwiki prints

failed to get filehandle:test.txt ; file:sandbox/test.txt ; is ref:

--Paweł

Well then, your CGI.pm is somehow not behaving as its documentation describes, in two ways: 1. upload() is not returning a reference to the filehandle 2. The filename returned by param("attachment") is not also a file handle. That seems very broken. I can try to work around it some more though. I've checked in a second try at dealing with things, can you try it? --Joey

Do you mean that 66f35e30dcea03c631a293e2341771277543b4ae? If so, then it causes "Internal Server Error" for me:

Can't use string ("test.txt") as a symbol ref while "strict refs" in use at /usr/share/perl5/IkiWiki/Plugin/attachment.pm line 144.

I can rebuild Debian stable source package with CGI for Perl. Maybe it will help me? What do you think? --Paweł

Silly thinko on my part, fixed that in git.. --Joey

Thanks for the fix, Joey! Now CGI doesn't fails, but still no success with attaching file:

failed to open : No such file or directory

Do you have any another idea how to resolve that problem? I can try with rebuilding package perl-modules if it's necessary in that situation. --Paweł

If CGI.pm is not creating a temp file, not providing a filehandle by either of its documented methods, then it's just broken; ikiwiki can't deal with that level of brokennecess. I need to find out if this affects stable in general, or just you/ubuntu. --Joey

Same thing on FreeBSD using CGI.pm 3.15. Looks like $self->{'.tmpfiles'} in CGI.pm is not populated with the information about the uploaded file, causing tmpFileName() to return '' (unloadInfo(), which uses the same lookup method fails in the same manner), but I have yet to find out why this happens. --HenrikBrixAndersen

The same message I can see in the Apache log file. There is also following warning:

Use of uninitialized value in length at /usr/share/perl5/IkiWiki/Plugin/attachment.pm line 36.

This is unrelated, I've fixed the warning message. --Joey

Is it Ikiwiki bug or my attachment plugin is misconfigured? --Paweł

I've reproduced the bug, and it does seem to be a bug with the perl in debian stable/ubuntu hardy. Trying to figure it out --Joey

This was amazingly disgusting, see commit message for the full horror of the details. I think it's done -- at least it works on debian stable now. --Joey

Wow! It's probably the biggest Ikiwiki commit message I've ever seen

Yes, I can confirm that now the plugin works for me and I'm able to add attachments to my wiki. Yupiii! Thanks a lot, Joey! You're really great! --Paweł

Thank you very much for your effort, Joey! --Paweł