Warning: This is a procedure that can bork your working copy. Backup and test to make sure you can recover before you even think about doing this.
Quickly remove .svn directories from a working copy linux
find . -type d -name .svn | xargs rm -rf
Checkout a fresh copy of the working copy somewhere else.
cd $HOME svn co http://yourreposserver/path/to/squid cd squid find . -type d -name .svn | xargs -ISVN cp -arv SVN /etc/squid/SVN