The official LiveJournal source repository at code.livejournal.org has been closed to those who don't work for LiveJournal since early 2014.
As a way of preserving (part of) the history of LiveJournal for posterity, I've created an archive repository, converted from Subversion to git so it's more usable with modern tools, that reflects every change from the LJ Subversion repository up to the end of March 2014.
After a considerable amount of history spelunking (with the help of burr86) I've been able to preserve the authorship information for many of the committers during the coversion to git, where possible using current email addresses to allow the commits to be attributed to each person's current github account.
I doubt anyone wants to run this code anymore (for that, the Dreamwidth code fork is probably an easier starting point) but I personally think LiveJournal made a significant contribution to the disciplines of collaborative development, scalable web application deployment and the social web, and thus I think its history (of which this codebase is a significant part) is worth preserving.
I hope someone finds this useful or interesting someday.