Scratch that WordPress Etch

This post comes via notes taken from another blog… seemingly gone awol.   Here for posterity.

Etch naturally has an older version of WordPress.  To upgrade to a more recent, possibly though unlikely more secure version,  the easiest way is to change your tracking to testing, install WordPress and then change back.  How to do it:

1.  Edit your /etc/apt/sources.list to track testing. If your sources.list says etch or stable, change that to testing.  For example if your source.list has:

deb http://debian.lcs.mit.edu/debian etch main contrib non-free
deb-src http://debian.lcs.mit.edu/debian etch main contrib non-free

change those to:

deb http://debian.lcs.mit.edu/debian testing main contrib non-free
deb-src http://debian.lcs.mit.edu/debian testing main contrib non-free

2.  After you change your tracking to testing do an apt-get update.

apt-get update

3.  Install WordPress

apt-get install wordpress

this may pull in a few new php libraries, such as libphp-phpmailer.  Let it.

(Note that you do not want to do an “upgrade”, but rather “install” as listed above.   “upgrade” will try to upgrade a ridiculous number of packages, whereas install will focus only on packages required for installing and/or upgrading WordPress.)

4.  Change your tracking back to Etch. just reverse what you did in step 1. that is change testing back to etch.

5.  Clean everything up.

apt-get clean && apt-get update

After all this is done, login back in as admin to WordPress, and it will tell you that you have to update your WordPress database tables.  Do that and you’re done.

WordPress Category Intersections Revisited

WordPress has included native support for intersections since (I think) version 2.3. Unfortunately, however, robust post retrieval support is only available for tags (eg. tag=A,B retrieves the union of “A” and “B”; tag=A+B retrieves the intersection of “A” and “B”).

Categories still require a hack, and the old plugins for this of course now no longer work.

To get intersection working, try adding the following line before the loop:

<br />
<?php <span style="color: #ff0000;">if ($_GET['cat']) query_posts(array('category__and'=>preg_split('/[\s,]+/',$_GET['cat'])));</span> ?><br />
<?php while( have_posts()) : the_post(); ?><br />

This applies an intersection to any list of categories separated by space, comma, or “plus” signs in the request.

See Ryan Boren’s post on WordPress intersection and union taxonomies for details on the various forms of post retrieval queries now available.

Visual editor broken in WordPress 1.3.2

Seems there is a bug in the latest WordPress check for gzip support which breaks visual editing. I’m not sure which condition below is causing the confusion

but if you modify the $supportsGzip variable to always return false as above, the problem goes away.

Intersecting Categories in WordPress

The default behavior of WordPress is to pull the union of multiple categories rather than the intersection. So, for example, ?cat=3,4 will show all items tagged to categories three and four. I think most people would expect this to be the reverse.

iSusi from Korea has a nice little plugin to fix this. InterCat sets the default behavior to generate, without additional joins, intersected category lists. Great for using WordPress to publish select streams of data to different sites.

Also of note: Olivier Crête’s Intersect Plugin

Working out karmic issues in WordPress

“Spam Karma” that is.

I’ve set up a couple of WordPress blogs over the last year or so. Some (unlike, say, this one) have become quite popular. Especially with comment and trackback spam.

Tried Dr. Dave’s Spam Karma 2 for awhile. SK2 comes with a host of modularized spam countermeasures. The good Doctor calculates a spam “karma” per module for each inbound comment. Comments with good karma pass through to enlightenment and… the dashboard. Those with outstanding karmic issues find themselves in purgatory to await ultimate review.

SK2 worked quite well for us, though there was the occasional false positive. And periodically reviewing hundreds of messages in comment purgatory was getting to be troublesome.

Recently however I’ve come across two plugins that seem to completely eliminate spam: WP Hashcash and Simple Trackback Validation.

Hashcash uses a JavaScript proof of work countermeasure to test that a browser, not a robot, is visiting one’s site. (Robots don’t run JavaScript.) STV uses two simple checks to confirm the validity of incoming trackback links.

Since implementing these two plugins last month, spam has gone from hundreds per day, to zero. What’s more, no missed comments.

All due respect to the good Doctor, but enough of karma. I’ve finally seen the light.