Freeze Rails to Edge RC2 via SVN Externals
cd ~/Sites/railsapp
svn propedit svn:externals vendor
# An editor will pop up, change RC1 to RC2 and save
svn up
svn ci -m "* Upgrade to RC2"
<3 SVN Externals
Bonus tip: I'm a habitual 'svn stat'er, and this helped speed up the process:
svn --ignore-externals stat