https://bugzilla.wikimedia.org/show_bug.cgi?id=30789

--- Comment #1 from Brion Vibber <[email protected]> 2011-09-07 00:59:15 UTC 
---
Ok, so the good news is the bug isn't in thumb-handler.php etc. :)
Seems odd...

With this original URL:

 
http://upload.wikimedia.org/wikipedia/en/thumb/archive/d/db/20110906223017!Ex_1%25_ample.jpg/111px-Ex_1%25_ample.jpg

it should be getting run via the thumb-handler.php on the upload server's 404
handler:

 
http://svn.wikimedia.org/viewvc/mediawiki/trunk/tools/upload-scripts/thumb-handler.php?view=markup

which should end up fetching something like:

 
http://en.wikipedia.org/w/thumb.php?f=20110906223017!Ex_1%25_ample.jpg&width=111&archived=1

This gives the same error when we fetch it directly:

  Error generating thumbnail

  Error creating thumbnail: convert: unable to open image
`/mnt/thumbs/wikipedia/en/thumb/archive/d/db/20110906223017!Ex_1%%_ample.jpg/111px-Ex_1%%_ample.jpg':
@ error/blob.c/OpenBlob/2498.

Now, the '1%%' looks wrong -- it should be '1%' here.


So, the good news is:
* it's not in thumb-handler.php (whew!) since it happens to direct thumb.php
calls

* it does the same for archived and current version files

And in fact I can reproduce it locally simply by uploading a local copy of 'Ex
1% ample.jpg' and trying to see the current-version page. This shows an error
right there on the page.

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