as you hopefully have not noticed (well, there was some downtime, but not more than usually afflicted by cablecom) i switched xyzzyxyzzy.net from gentoo to running ubuntu server 7.10 on monday.² along with that came a reorganization of the web server directory layout — and i took the chance to clean up. pretty much everything is running again (and thx to having that complete backup of the mysql databases all blogs and photo blogs are back as well :-) — with the exception of the QR code stuff, which was not really generating QR codes for new posts anymore.

this had me baffled as all the path names and what have you were looking ok, permission were fine, the works. still no QR codes and the test image wouldn’t work either…i did manage to get it working, here’s a brief overview¹ of what i did:

# install command line php5 so that we can poke at the php code manually, so to speak
% sudo apt-get install php5-cli

# qrcode lib lives in /usr/local/share/qrcode/qrcode_php0.50beta10
% cd /usr/local/share/qrcode/qrcode_php0.50beta10

# let's try invoking the sample.php via php5
% php5 sample.php
[...lots of error messages...]

those error messages revealed that i had forgotten to adjust QRCODE_DATA_PATH — for some strange reason, wp-qrcode doesn’t get that across from the wordpress configuration — fixing that path fixed the problem. sweat :-)

define ("QRCODE_DATA_PATH","/usr/local/share/qrcode/qrcode_php0.50beta10/qrcode_data");