updater.rb

#!/usr/bin/env ruby1.9
require 'tmpdir'
require 'date'
require 'iconv'

class String
  def quote
    gsub(/([$"\\])/, '\\\\\1')
  end
end

class NginxUpdater

  module Config
    NGINX_SRC_PATH = ARGV[0]
    TMP_DIR_SUFFIX = "nginx-updater"
    AUTHOR         = "Igor Sysoev <igor@sysoev.ru>"
  end
  
  class Version < Array
    def to_s
      "#{self[0]}.#{self[1]}.#{self[2]}"
    end
    
    def url
      "http://sysoev.ru/nginx/nginx-#{self}.tar.gz"
    end
  end
  
  def initialize
    @ic = Iconv.new('UTF-8//IGNORE', 'UTF-8')
    @branches = ["0.7", "0.8", "0.9"]
    ENV["GIT_DIR"] = "#{Config::NGINX_SRC_PATH}.git/"
  end
  
  def run
    Dir.chdir(Config::NGINX_SRC_PATH)
    
    unless `git st` =~ /working directory clean/
      warn "error: working directory is not clean"
      return 1
    end
    
    @branches.each do |branch|
      update_branch branch
    end
    
    return 0
  end

  def update_branch git_branch
    
    git_checkout(git_branch)
    
    while true do
      get_latest
      
      current = guess_current_nginx_version
      puts "Current version is #{current}"
      
      nxt = guess_next_version(current)
      unless nxt
        puts "Current version is the latest"
        return
      end
      
      puts "Next version is #{nxt}"
      
      prepare_temp_dir
      get_version nxt
      changes = get_changes nxt
      commit nxt, changes["message"], changes["date"]
    end
  end
  
  def prepare_temp_dir
    @tmp = "#{Dir.tmpdir}/#{Config::TMP_DIR_SUFFIX}"
    FileUtils.rm_rf(@tmp)
    FileUtils.mkdir_p(@tmp)
  end
  
  def guess_next_version v
    n = v.dup
    
    found = nil
    misses = 0
    while misses < 3
      n[2] += 1
      if check_version(n)
        return n
      end
      misses += 1
    end
    found
  end
  
  def check_version v
    puts "..checking for #{v}"
    !!`curl -sI #{v.url}`.match(/200 OK/)
  end
  
  def get_version v
    `curl -so #{@tmp}/nginx.tar.gz #{v.url}`
    `tar -xzf #{@tmp}/nginx.tar.gz -C #{@tmp}`
  end
  
  def get_changes v
    changes = @ic.iconv(File.read("#{@tmp}/nginx-#{v}/CHANGES"))
    changes.scan(/^Changes\s+with\s+nginx\s+(\d+\.\d+\.\d+)\s+(\d+\s+\w+\s+\d+)\n(.+?)\n\n\n/m) do |m|
      unless m[0] == v.to_s
        next
      end
      return {
        "date" => Date.parse(m[1]),
        "message" => m[2]
      }
    end
    nil
  end
  
  def commit v, message, date
    ENV["GIT_AUTHOR_DATE"] = date.strftime("%Y-%m-%d 12:00:00")
    
    system(%Q{
      cd #{@tmp}/nginx-#{v}/
      git add . && git add -u . && git status
      git commit --author="#{Config::AUTHOR}" --message="nginx #{v}\n\n#{message.quote}"
      git tag #{v}
    })
  end
  
  def git_checkout branch
    system("git checkout #{branch} && git reset --hard && git clean -f -d")
  end
  
  def get_latest
    system("git reset --hard && git clean -f -d")
  end
  
  def guess_current_nginx_version
    source = File.read("src/core/nginx.h")
    Version.new(source.scan(/#define\s+NGINX_VERSION\s+"(\d+)\.(\d+)\.(\d+)"/)[0].map{ |v| v.to_i })
  end
  
end

exit NginxUpdater.new.run