git リポジトリにデカい（1MB以上）バイナリファイルが push されそうになったら阻止するスクリプト

update

#!/usr/bin/ruby

class Custom
  def self.get_log(old_value, new_value)
   if old_value == "0000000000000000000000000000000000000000"
     git_log = `git log --stat #{new_value}`
   else
     git_log = `git log --stat #{old_value}..#{new_value}`
   end
  end

  def self.get_bigs(log)
    big_files = Array.new

    log.each_line {|line|
      if not line.start_with?(" ")
        # this is not file
        next
      elsif line.start_with?("    ")
        # this is comment text
        next
      elsif not line.include?("|")
        # this is support sentence. e.g. "1 file changed, 1 insertion(+)" 
        next
      elsif not line.split("|")[1].include?("Bin")
        # this is just text file, then ignore 
        next
      end

      # to avoid confusing by space-included file name. last string must be "bytes" 
      splitted = line.split(" ")
      byte = splitted[(splitted.length - 2)]

      # TODO hard coding file size limitation
      if byte.to_i > 1024 * 1024
        big_files.push("*  " + line)
      end
    }

    big_files
  end

  def self.big_binary?(old_value, new_value)
    git_log = get_log(old_value, new_value)
    big_files = get_bigs(git_log)
    if big_files.empty?
      return false
    else
      puts ""
      puts "********** ********** ********** ********** ********** **********"
      puts "* DO NOT commit binary files directly, use git-media."
      puts "* see https://info.hue.workslan/redmine/projects/hue-ci-infra/wiki/How-to-use-git-media"
      puts "* "
      puts "* BINARY FILES are..."
      puts big_files
      puts "********** ********** ********** ********** ********** **********"
      puts ""
      return true
    end
  end
end

old_value = ARGV[1]
new_value = ARGV[2]

if not Custom::big_binary?(old_value, new_value)
  exit 0
else
  exit 1
end