class Backupsss::Tar

The Tar class is used for creating a tar archive.

Attributes

compress_archive[R]
dest[R]
src[R]

Public Class Methods

new(src, dest, compress_archive = true) click to toggle source
# File lib/backupsss/tar.rb, line 8
def initialize(src, dest, compress_archive = true)
  @src              = src
  @dest             = dest
  @compress_archive = compress_archive
end

Public Instance Methods

filename() click to toggle source
# File lib/backupsss/tar.rb, line 53
def filename
  dest.split('/').last
end
make() click to toggle source
# File lib/backupsss/tar.rb, line 14
def make
  return unless valid_dest? && valid_src?
  _, err, status = Open3.capture3("#{tar_command} #{dest} #{src}")
  File.open(dest) if valid_exit?(status, err) && valid_file?
end
messages() click to toggle source
# File lib/backupsss/tar.rb, line 38
def messages
  {
    no_file:   'ERROR: Tar destination file does not exist.',
    zero_byte: 'ERROR: Tar destination file is 0 bytes.'
  }
end
tar_command() click to toggle source
# File lib/backupsss/tar.rb, line 57
def tar_command
  compress_archive ? 'tar -zcvf' : 'tar -cvf'
end
valid_dest?() click to toggle source
# File lib/backupsss/tar.rb, line 45
def valid_dest?
  dir_exists?(dest_dir) && dest_writable?
end
valid_exit?(status, err) click to toggle source
# File lib/backupsss/tar.rb, line 20
def valid_exit?(status, err)
  output = []
  output << "command.......#{tar_command}"
  output << "stderr........#{err}" unless err.empty?
  output << "status........#{status}"
  output << "exit code.....#{status.to_i}"
  $stdout.puts output.join("\n")

  return true if success_cases(status.to_i, err)
  raise "ERROR: #{tar_command} exited #{status.to_i}"
end
valid_file?() click to toggle source
# File lib/backupsss/tar.rb, line 32
def valid_file?
  raise messages[:no_file] unless File.exist?(dest)
  raise messages[:zero_byte] if File.size(dest).zero?
  true
end
valid_src?() click to toggle source
# File lib/backupsss/tar.rb, line 49
def valid_src?
  dir_exists?(src) && src_readable?
end

Private Instance Methods

clean_exit(status) click to toggle source
# File lib/backupsss/tar.rb, line 63
def clean_exit(status)
  status.zero?
end
dest_dir() click to toggle source
# File lib/backupsss/tar.rb, line 67
def dest_dir
  File.dirname(dest)
end
dest_writable?() click to toggle source
# File lib/backupsss/tar.rb, line 71
def dest_writable?
  File.writable?(dest_dir) || raise_sys_err(dest_dir, Errno::EPERM::Errno)
end
dir_exists?(dir) click to toggle source
# File lib/backupsss/tar.rb, line 75
def dir_exists?(dir)
  File.exist?(File.open(dir)) || raise_sys_err(dir, Errno::ENOENT::Errno)
end
file_changed?(err) click to toggle source
# File lib/backupsss/tar.rb, line 79
def file_changed?(err)
  err.match(/file changed as we read it/)
end
raise_sys_err(dir, err) click to toggle source
# File lib/backupsss/tar.rb, line 91
def raise_sys_err(dir, err)
  raise SystemCallError.new(dir.to_s, err)
end
src_readable?() click to toggle source
# File lib/backupsss/tar.rb, line 83
def src_readable?
  File.readable?(src) || raise_sys_err(src, Errno::EPERM::Errno)
end
success_cases(signal_int, err) click to toggle source
# File lib/backupsss/tar.rb, line 87
def success_cases(signal_int, err)
  clean_exit(signal_int) || file_changed?(err)
end