Using Subversion Ruby bindings

I tried to do some subversion hacking from Ruby, very simple things like add/remove files,
commits and so, and realized that there’s no documentation at all out there, just blog posts
here and there.

I finally got something working, including user authentication (that is not as easy as you would
expect) and ignoring https certificates not signed by a trusted CA. Something like committing a file is not as simple as it would seem.

You have to make sure you have the latest version installed. In linux it means installing the subversion-ruby package. In OS X is more complicated, you need to remove the preinstalled subversion, install the newer one from Collabnet, and move some files around.

mv /Library/Ruby/Site/1.8/svn /Library/Ruby/Site/1.8/svn.bak
mv /Library/Ruby/Site/1.8/universal-darwin9.0/svn /Library/Ruby/Site/1.8/universal-darwin9.0/svn.bak
ln -s /opt/subversion/lib/svn-ruby/svn /Library/Ruby/Site/1.8/svn
ln -s /opt/subversion/lib/svn-ruby/universal-darwin/svn /Library/Ruby/Site/1.8/universal-darwin9.0/svn

Once you have it installed then you can call the svn libraries

  require "svn/core"
  require "svn/client"
  require "svn/wc"
  require "svn/repos"

  make_context("") do |ctx|
    # checkout
    ctx.checkout SVN_URL, "/tmp"
  end

  # Add a file and commit with a message
  make_context("Adding a file") do |ctx|
    ctx.add f
    ctx.commit f
  end

  # from http://svn.collab.net/repos/svn/trunk/subversion/bindings/swig/ruby/test/util.rb
  def make_context(log)
    ctx = Svn::Client::Context.new

    # Function for commit messages
    ctx.set_log_msg_func do |items|
      [true, log]
    end

    # don't fail on non CA signed ssl server
    ctx.add_ssl_server_trust_file_provider

    # username and password
    ctx.add_simple_prompt_provider(0) do |cred, realm, username, may_save|
      cred.username = "myusername"
      cred.password = "mypassword"
      cred.may_save = false
    end
    # setup_auth_baton(ctx.auth_baton)
    return ctx unless block_given?
    begin
      yield ctx
    ensure
      ctx.destroy
    end
  end

One thought on “Using Subversion Ruby bindings

  1. Thanks for putting this together. I’m just learning to grasp OO concepts and this is helping me. Plus I have a need to script something to access an subversion repo. This is a perfect start for me.

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