Class: Backup::FileBackup

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

Overview

Backup directories and files to a backup directory

Instance Method Summary collapse

Constructor Details

#initialize(files = []) ⇒ FileBackup

Initializes the files to be backed up. If no file is provided an error is returned



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# File 'lib/backup/file_backup.rb', line 16

def initialize(files=[])
  @files = files
end

Instance Method Details

#backup(backup_folder) ⇒ Object

The files to be backed up are initilized when creating an instance of FileBackup. These files are then backed up to the backup directory



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

def backup(backup_folder)

  inexistent_files = []

  @files.each do |file|
    inexistent_files << file unless File.exists? file
  end

  unless inexistent_files.empty?
    STDERR.puts "Cannot backup inexistent files"
    STDERR.puts "Following #{inexistent_files.size} file(s) do not exist"
    STDERR.puts "#{inexistent_files.join(', ')}"
    exit 1
  end
  
  backup_folder += '/' unless backup_folder.match(/.*\/\Z/)
  
  Dir.mkdir backup_folder unless File.exists? backup_folder

  backup_files = []

  @files.each.with_index do |file, index|
    backup_files << backup_file = backup_folder+File.basename(file)
    FileUtils.cp file, backup_file
  end

  backup_files

end

#check_for_inexistent(files) ⇒ Object

Checks if the files all exist. Files that do not exist are returned in an Array



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

def check_for_inexistent (files)
  inexistent_files = []
  files.each do |f|
    inexistent_files << f unless File.exists? f
  end

  inexistent_files
end

#compress(files, backup_folder) ⇒ Object

Compress the files to the backup directory



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# File 'lib/backup/file_backup.rb', line 21

def compress(files, backup_folder)
  inexistent_files = check_for_inexistent files
  unless inexistent_files.empty?
    STDERR.puts "Cannot compress inexistent files"
    STDERR.puts "Following #{inexistent_files.size} file(s) do not exist"
    STDERR.puts inexistent_files.join(" ")
    exit 2
  end

  timestamp = Time.now.strftime("%Y%m%d-%H%M%S")
  backup_folder += '/' unless backup_folder.match(/.*\/\Z/)
  compress_file = backup_folder + timestamp + "_" + "files.tar.gz"

  tar_command = "tar cfz #{compress_file} " + files.join(" ")

  stdout_str, stderr_str, status = Open3.capture3(tar_command)

  unless status.exitstatus == 0
    STDERR.puts "There was a problem running tar command"
    STDERR.puts "--> #{tar_command}"
    STDERR.puts stderr_str
    exit(2)
  end

  status.exitstatus

end