Class: Backarch::TarWrapper

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

Constant Summary collapse

BLOCKSIZE =

BLOCKSIZE = 10737418 # 10MB

1_073_741_824

Class Method Summary collapse

Class Method Details

.create_multiple_volumes(origin, destination) ⇒ Object

Invokes GNU tar to generate a multi-volume tar for parallel upload and download. eg: gtar -cML 30720 -f file1.tar -f file2.tar -C /tmp/elasticsearch_snapshots/full 20140605



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# File 'lib/backarch/tar_wrapper.rb', line 11

def create_multiple_volumes(origin, destination)
  FileUtils.mkdir_p destination

  tar = validate_gnu_tar_installed
  output_files = generate_output_files(origin, destination)
  tape_limit = BLOCKSIZE / 1024
  working_directory = File.dirname origin
  basename = File.basename origin

  command = "#{tar} -cML #{tape_limit} -f #{output_files.join(" -f ")} -C #{working_directory} #{basename}"
  LOG.info "Creating tar volumes: #{command}"
  return StandardError, "Failed to create tar volumes" unless system(command)
end

.restore_from_volumes(origin, destination) ⇒ Object 



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# File 'lib/backarch/tar_wrapper.rb', line 25

def restore_from_volumes(origin, destination)
  FileUtils.mkdir_p destination

  tar = validate_gnu_tar_installed
  input_files = generate_input_files(origin)
  command = "#{tar} -xMf #{input_files.join(" -f ")} -C #{destination}"
  LOG.info "Restoring from tar volumes: #{command}"
  return StandardError, "Failed to restore from tar volumes" unless system(command)
end