googlecode_svn2_git.rb

#!/usr/bin/env ruby

########################################################################
# Convert a googlecode svn project to git and also can push to github
#  - It's a wrapper around svn2git
#  - uses ssh to push to github
#  requires:
#    svn2git and git-svn
# muquit@muquit.com 2013-12-29 15:07:04 -0500 - first cut
########################################################################

require 'logger'
require 'date'
require 'fileutils'
require 'pp'


me = __FILE__
while File.symlink?(me)
    me = File.expand_path(File.readlink(me), File.dirname(me))
end
MYDIR = File.expand_path(File.dirname(me))

$: << MYDIR
require 'loadgems.rb'
require 'trollop'


class GoogleCode2Git
  STDERRLOGGER = Logger.new(STDERR)
  ME = File.basename($0)
  VERSION = "1.01"

  def initialize
    @topts = nil
    @svn_url = nil
  end

  def log(msg)
    STDERRLOGGER.info "#{msg}"
  end

  def directory_exists?(dir)
    return false if !dir
    return File.exists?(dir) && File.directory?(dir)
    return false
  end


  def make_dir(dir)
    if !directory_exists?(dir)
      pwd = Dir.pwd
      begin
        FileUtils.mkdir_p(dir)
      rescue => e
        log "Error: Could not create directory #{dir} #{e}"
        exit 1
      end
    end
  end

  def convert
    gc_project = @topts[:gproject]
    if !gc_project
      puts <<-EOF
  Error: specify googlecode project namae with --gproject
EOF
      exit 1
    end
    if !@topts[:dir]
      puts <<-EOF
  Error: specify the path of a non existent directory to convert to with --dir
EOF
      exit
    end
    dir = @topts[:dir]
    if directory_exists?(dir)
      log "Error: directory #{dir} already exists. exiting.."
      exit 1
    end
    pwd = Dir.pwd
    make_dir(dir)
    Dir.chdir(dir)

    log "Working directory: #{Dir.pwd}"
    @svn_url = ""
    @svn_url << "http://" + gc_project + ".googlecode.com/svn"
    log "SVN url: #{@svn_url}"
    cmd = ""
    cmd << "svn2git"
    cmd << " "
    cmd << "\"#{@svn_url}\""
    if @topts[:authors]
      cmd << " "
      cmd << "--authors"
      cmd << " "
      cmd << @topts[:authors]
    end
    cmd << " "
    cmd << "--verbose"
    log "run: #{cmd}"
    system(cmd)
    Dir.chdir(pwd)
  end
  def push_to_github
    username = @topts[:gituser]
    gitproject = @topts[:gitproject]
    if !username
      puts <<-EOF
 Error: sepcify the github user name with --gituser
EOF
      exit 1
    end
    if !gitproject
      puts <<-EOF
 Error: sepcify the github project name with --gitproject
EOF
      exit 1
    end

    cmd = ""
    cmd << "git"
    cmd << " "
    cmd << "remote add origin git@github.com"
    cmd << ":"
    cmd << username
    cmd << "/"
    cmd << gitproject
    cmd << ".git"
    log "run: #{cmd}"
    system(cmd)

    cmd = "git push -u origin master"
    log "run #{cmd}"
    system(cmd)
  end

  def show_examples
      puts <<-EOF
 For help, type:
 #{ME} --help

 - To convert a googlecode project to git:
  #{ME} --convert --gproject <project name> --dir <directory>
 The directory must not exist, it will be created

 Example:
  #{ME} --convert --gproject mailsend /tmp/mailend

 - To push the converted project to github, first create a rspository
 for the project in github. Then do the following:
  #{ME} --push --gituser <user> --gitproject <project name>
  
 Example:
  #{ME} -push \\
    --gituser muquit --gitproject mailsend

EOF

  end

  def doit
    parse_args
    if @topts[:push]
      push_to_github
      exit 0
    elsif @topts[:convert]
      convert
      exit 0
    else
      show_examples
      exit 0
    end
  end

  def parse_args
    @topts = Trollop::options do
      version "#{ME} v#{VERSION}"
       banner <<-EOS
#{version}
 A script to convert svn googlecode to git
 Usage: #{ME} options
 Where the options are:
EOS
      opt :convert,   "Convert googlecode project to git"
      opt :dir, "The directory to convert the project to", :type => :string
      opt :gproject,  "Name of google project", :type => :string
      opt :authors,  "Path of authors.txt file", :type => :string
      opt :gituser, "github username", :type => :string
      opt :gitproject, "Name of the github project", :type => :string
      opt :push, "push git project to github"
    end
  end

end

if __FILE__ == $0
  GoogleCode2Git.new.doit
end