compare two directories using a sha-256 hash digest

checker.rb

#!/usr/bin/env ruby

require 'sequel'
require 'digest'

CHECK_DIR = '/home/javier/my_dir'
DB = Sequel.sqlite('/home/javier/scanner.db')

PATHS = Dir.glob(File.join(CHECK_DIR, '**/{*,.*}'))

counter = 0
not_found_counter = 0
total = PATHS.length
checksums = DB[:checksums]

PATHS.each do |file|
  if File.file? file
    digest = Digest::SHA256.file( file ).hexdigest

    unless checksums.first( digest: digest )
      puts file
      not_found_counter += 1
    end

    counter += 1

    if counter % 100 == 0
      puts "#{counter}/#{total}"
    end
  end
end

puts "#{not_found_counter} files not found!"

Gemfile

source 'https://rubygems.org'

gem 'sequel'
gem 'sqlite3'

indexer.rb

#!/usr/bin/env ruby

require 'sequel'
require 'digest'

SCAN_DIR = '/home/javier/Dropbox'
DB = Sequel.sqlite('/home/javier/scanner.db')

unless DB.table_exists?(:checksums)
  DB.create_table(:checksums) do
    primary_key :id
    String :path, text: true
    String :digest, size: 64
  end
end

PATHS = Dir.glob(File.join(SCAN_DIR, '**/{*,.*}'))

counter = 0
total = PATHS.length
checksums = DB[:checksums]

PATHS.each do |file|
  if File.file? file
    digest = Digest::SHA256.file( file ).hexdigest
    checksums.insert path: file, digest: digest
    counter += 1

    if counter % 100 == 0
      puts "#{counter}/#{total}"
    end
  end
end