How to clone our codebase

  git svn clone http://xxx.xxx.xxx/trunk

How to setup your local git svn repo

  git svn init --stdlayout http://xxx.xxx.xxx
  git fetch

How to update your current codebase

  git svn rebase

How to make changes and commit

  git add xxx   # this will stage your changes
  git commit    # this will commit your changes to your local git repo
  git svn dcommit  # this will push the diffs between your git head and remote/git-svn to the remote svn repo and update your local repo to the latest svn head

How to make tag/branch

  git svn reset -r<n> # choose the svn revision you want to tag/branch for
  git svn tag -m "xxxxx" mytag
  git svn branch -m "xxxx" mybranch

How to checkout specific revision

   git checkout <revision-commint-sha>

How to push local commits into different svn branch

  git rebase remotes/xxx
  git svn dcommit --dry-run # this check if the commits go to the right remote branch
  git svn dcommit

How to find more helps

  git help svn