svn: make the branches directory before make a branch

http://dryice.name/blog/freebsd/svn-make-the-branches-directory-before-make-a-branch/

Well, this is a short note to myself so the next time I want to create a branch of a new project, I won't need to search through the Internet.

Before doing

$ svn copy http://svn.example.com/repos/calc/trunk \
http://svn.example.com/repos/calc/branches/my-calc-branch \
-m "Creating a private branch of /calc/trunk."

to make a new branch of a new project (which don't have any branches yet), I'll need to do

svn mkdir http://svn.example.com/repos/calc/branches \
-m "make the branches directory to hold all the branches"

first.

Or I'll get an error message like

svn: Path 'branches' not present

The reason is, like the error message said, there is no directory "branches" in the repo, and svn copy, like the "cp" command, won't make a directory if it's not there. It will assume I made a typo. A safe guard. And I need to explicitly create the directory.