OH NOES, a DRUPAL CORE HACK DETECTED!

After working on some 50-odd Drupal projects over the past few years and inheriting a number of (often questionable) others, it occurred to us it'd be a good idea to have a script that detects hacks and/or "modifications" to Drupal core for a given Drupal install. The result is this remedial PHP script (or core agent) that detects your version of Drupal, downloads the appropriate tarball from Drupal.org, runs a diff on /modules, /misc and /includes, and returns you the results.

Here's some sample output:

************************************
* Drupal Core Agent v1.0 *
************************************
No argument specified; running in current directory
Fetching Drupal version 5.10
Drupal version 5.10 downloaded. Extracting..
Drupal core files extracted. Comparing..
+---------------------------------------------------+
Comparing modules ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/aggregator ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/block ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/blog ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/blogapi ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/book ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/color ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/color/images ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/comment ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/contact ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/drupal ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/filter ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/forum ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/help ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/legacy ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/locale ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/menu ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/node ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/path ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/ping ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/poll ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/profile ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/search ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/statistics ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/system ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/taxonomy ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/throttle ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/tracker ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/upload ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/user ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing modules/watchdog ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing misc ..
+---------------------------------------------------+
FILE NOT PRESENT IN 5.10 CORE: misc/.htaccess
DRUPAL CORE HACK DETECTED: misc/collapse.js
+---------------------------------------------------+
Comparing misc/farbtastic ..
+---------------------------------------------------+
DRUPAL CORE HACK DETECTED: misc/jquery.js
DRUPAL CORE HACK DETECTED: misc/tableselect.js
DRUPAL CORE HACK DETECTED: misc/upload.js
+---------------------------------------------------+
Comparing includes ..
+---------------------------------------------------+
DRUPAL CORE HACK DETECTED: includes/common.inc
FILE NOT PRESENT IN 5.10 CORE: includes/common.inc.orig
+---------------------------------------------------+
Comparing themes ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/bluemarine ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/chameleon ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/chameleon/marvin ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/engines ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/engines/phptemplate ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/garland ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/garland/color ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/garland/images ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/garland/minnelli ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/garland/minnelli/color ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing themes/pushbutton ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing profiles ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing profiles/default ..
+---------------------------------------------------+
+---------------------------------------------------+
Comparing scripts ..
+---------------------------------------------------+
Cleaning up ..
Finished.


You can find more information and grab the latest release here:

http://code.google.com/p/coreagent/

NEXT UP: Adding support for contrib modules, and--more immediately--turning it into a Drupal module with hooks for Drush.

UPDATE:

I've added an optional parameter so you can now specify the version of Drupal you want to diff against - this is particularly useful when doing upgrades, since it will allow you to see what files have changed from your previous version.