/app/models/repository_observer.rb

class RepositoryObserver < ActiveRecord::Observer
# CREATE DIR Manually
# KNOWN Problem: Changing BitBucket Git Dir in use
# KNOWN Problem: Two Repositorys with the same name from different users

  def before_save(repository)
      if repository.type == 'Git' && repository.url.match('.*bitbucket.org.*')
          base_dir_name = repository.url[/[^\/]+.git/]
          url = repository.url
          user = /^\S*[:\/](.*)\/\S*$/.match( url )
          user = user[1]
          git_dir = Setting.plugin_redmine_bitbucketgit_hook[:bitbucketgit_dir].to_s
          git_dir = git_dir  + '/' + user + '_' + base_dir_name 
          p git_dir
          redminedir = RAILS_ROOT + '/'
          p redminedir+git_dir
          if Dir[redminedir+git_dir] == []
          	exec('git clone --mirror '+ url + ' "'+ redminedir + git_dir +'"')
          else
          	p "Dir already in use..."
          end
          repository.url = redminedir + git_dir
      end
  end
  
  private
  def exec(command)
  p "BitbucketGitHook: Executing command: '#{command}'"
    output = `#{command}`
    p "BitbucketGitHook: Shell returned '#{output}'"
  end

end