Adding a new branch

When a new branch has been added into SVN repo, a corresponding Git branch must be created and set up for tracking.

• in the SVN history, find the "version" commit that precedes branch creation, obtain its hash (git svn find-rev rXXXX on the trunk branch);
• in the Git repo, create a file in the .git/refs/remotes/branches with the name of the branch (say 3.3), and write the commit hash there;
• in .git/config, add the new branch (in the list of branches, and a section);
• create a git branch for tracking: git branch --track 3.3 refs/remotes/branches/3.3;
• erase git-svn cache: rm -rf .git/svn;
• git svn fetch (will take awhile);
• add the new branch into the list in update.sh script.

Forcing git-svn to fetch a particular branch (in case it skips it for some reason):

in .git/config:

[svn-remote "svn"]
        url = https://v8.googlecode.com/svn
        fetch = 3.11:refs/remotes/branches/3.11
        branches = branches/{3.11}:refs/remotes/branches/*

then just do git svn fetch (takes awhile as usual).