recursive zip compare (deep zipcmp)

zipcmp.rb

#!/usr/bin/ruby

require 'fileutils'

def run(args)
  args = args.gsub /$/, ''
  `#{args}`
end

def listzip(file)
  (run <<-EOF
    unzip -l "#{file}" | tail -n+4 | head -n-2 | cut -c31-
  EOF
  ).split ("\n")
end

def md5sum(file)
  (run <<-EOF
    md5sum "#{file}" | cut -c1-32
  EOF
  ).chomp
end

def quote_args(*args)
  "\"#{args.join('" "')}\"".gsub /""/,''
end

@tmps = []
def extract_zip(file, *args)
  out = `mktemp -d`.strip
  @tmps << out
  run <<-EOF
    unzip -d "#{out}" "#{file}" #{quote_args args}
  EOF
  return out
end

def should_recurse(f)
  (run <<-EOF
    file "#{f}"
  EOF
  )=~ /zip/i
end

def zip_diff(z1, z2)
  files1 = listzip(z1)
  files2 = listzip(z2)

  md5_1 = md5sum z1
  md5_2 = md5sum z2

  return if md5_1 == md5_2

  puts
  puts "--- #{z1} #{md5_1}"
  puts "+++ #{z2} #{md5_2}"

  {z1 => files2-files1, z2 => files1-files2}.each_with_index do |(src,array),i|
    if !array.empty?
      array.each { |f| puts "#{0 == i ? "+" : "-"} #{f}" }
    end
  end

  both = files1 & files2
  if !both.empty?
    dir1 = extract_zip z1
    dir2 = extract_zip z2
    both.each do |f|
      if should_recurse "#{dir1}/#{f}"
        zip_diff "#{dir1}/#{f}", "#{dir2}/#{f}"
      end
    end
  end
end

zip_diff ARGV[0], ARGV[1]

FileUtils.rm_r @tmps