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Easy Drupal Upgrades Using Subversion

I’ve long been puzzled by the official advice on upgrading Drupal

It basically says you should delete everything, unpack a new Drupal version, and replace your customisations.

I like to use version control to manage my site.

My current project uses the pressflow fork of Drupal, I downloaded the current and new versions of this, added them to my repository and then upgrading my working copy is as easy as

svn merge –ignore-ancestry ./

This merges in all the changes (including file/directory additions/deletes).

Then I play around with the newly upgraded site, have a look at the code that changed, check all is OK and when I’m happy - commit the changes.

If I later find a bug that might be related to an upgrade I’ve got the changes ready via the usual tools (annotate, log, diff).

Even better - this retains any changes I’ve made to core without any need to keep a list of patches. If the core update contains a fix I’ve applied locally then I’ll get a conflict which I can resolve.