Class: Backup

Inherits:
Object
  • Object
show all
Defined in:
lib/backup/backup.rb

Direct Known Subclasses

DbBackup, EtcBackup

Constant Summary collapse

DATE_FORMAT = 
'%Y-%m-%d-%H-%M'

Instance Method Summary collapse

Constructor Details

#initialize(compress: true, encrypt: nil) ⇒ Backup

Returns a new instance of Backup.



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# File 'lib/backup/backup.rb', line 7

def initialize compress: true, encrypt: nil
  @compress = compress
  @encrypt = encrypt.nil? ? !ENV['GPGKEY'].nil? : encrypt
  raise "GPGKEY environment variable should be specified for encryption" if encrypt? && ENV['GPGKEY'].nil?
  ensure_path
end

Instance Method Details

#backup_command ⇒ Object

Main pipe, which generates data for backup



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# File 'lib/backup/backup.rb', line 47

def backup_command
  "echo Just text to backup"
end

#backup_type ⇒ Object 



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# File 'lib/backup/backup.rb', line 26

def backup_type
  self.class.to_s.gsub('Backup', '').downcase
end

#clean_files ⇒ Object 



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# File 'lib/backup/backup.rb', line 92

def clean_files
  result = {} # true - delete file, false - do not delete
  months_taken = []
  days_taken = []
  files = Dir.entries(path) - ['.', '..']
  files.each do |file|
    datetime = get_datetime_from_filename(file)
    day_id = datetime.strftime('%Y-%m-%d')
    month_id = datetime.strftime('%Y-%m')
    if datetime < (DateTime.now << 2)     # 2 month ago
      if datetime.day == 1 && !(months_taken.include? month_id)
        result[file] = false
        months_taken << month_id
      else
        result[file] = true
      end
    elsif datetime < DateTime.now - 14 # 2 weeks ago
      if [1, 7, 14, 21].include?(datetime.day) && !(days_taken.include?(day_id))
        result[file] = false
        days_taken << day_id
      else
        result[file] = true
      end
    end
  end

  puts "Candidates to removal: #{result.select{|file, delete| delete }.keys.inspect}"
end

#compress? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/backup/backup.rb', line 14

def compress?
  @compress
end

#debug? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/backup/backup.rb', line 22

def debug?
  ENV['DEBUG'] == 'true'
end

#encrypt? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/backup/backup.rb', line 18

def encrypt?
  @encrypt
end

#encrypt_compress_pipe_command ⇒ Object 



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# File 'lib/backup/backup.rb', line 51

def encrypt_compress_pipe_command
  if encrypt?
    "| gpg2 --encrypt #{"--compress-algo=bzip2" if compress?} --recipient=#{ENV['GPGKEY']}"
  else
    "| bzip2" if compress?
  end
end

#ensure_path ⇒ Object 



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# File 'lib/backup/backup.rb', line 71

def ensure_path
  `mkdir -p #{path}`
end

#filename ⇒ Object 



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# File 'lib/backup/backup.rb', line 30

def filename
  "#{backup_type}-#{DateTime.now.strftime(DATE_FORMAT)}.#{filename_extension}"
end

#filename_extension(base = 'tar') ⇒ Object 



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# File 'lib/backup/backup.rb', line 34

def filename_extension(base = 'tar')
  if encrypt?
    "#{base}.gpg"
  else
    if compress?
      "#{base}.bz2"
    else
      base
    end
  end
end

#filepath ⇒ Object 



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# File 'lib/backup/backup.rb', line 67

def filepath
  "#{path}/#{filename}"
end

#get_datetime_from_filename(filename) ⇒ Object 



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# File 'lib/backup/backup.rb', line 75

def get_datetime_from_filename filename
  DateTime.strptime(filename.split('-')[2], DATE_FORMAT)
end

#output_command ⇒ Object 



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# File 'lib/backup/backup.rb', line 59

def output_command
  "> #{filepath}"
end

#path ⇒ Object 



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# File 'lib/backup/backup.rb', line 63

def path
  "#{Techinform::BACKUPS_LOCAL_PREFIX}/#{backup_type}"
end

#print_info ⇒ Object 



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# File 'lib/backup/backup.rb', line 79

def print_info
  puts "Run backup to #{filepath}..."
end

#run ⇒ Object 



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# File 'lib/backup/backup.rb', line 83

def run
  print_info
  command = "#{backup_command} #{encrypt_compress_pipe_command} #{output_command}"
  puts "Command: #{command}" if debug?
  output = `#{command}`
  puts output unless output.empty?
end