Class: I18nContextGenerator::Writers::AtomicFile

Inherits:
Object
  • Object
show all
Defined in:
lib/i18n_context_generator/writers/atomic_file.rb

Overview

Safely replaces an existing file after optionally validating the candidate.

Class Method Summary collapse

Class Method Details

.replace(path, content) ⇒ Object 



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# File 'lib/i18n_context_generator/writers/atomic_file.rb', line 11

def replace(path, content)
  original_mode = File.stat(path).mode & 0o7777
  directory = File.dirname(File.expand_path(path))
  basename = File.basename(path)
  temporary_file = Tempfile.new([".#{basename}.", '.tmp'], directory)
  temporary_path = temporary_file.path

  begin
    temporary_file.binmode
    temporary_file.write(content)
    temporary_file.flush
    temporary_file.fsync
    temporary_file.chmod(original_mode)
    temporary_file.close

    yield temporary_path if block_given?

    File.rename(temporary_path, path)
  ensure
    temporary_file.close unless temporary_file.closed?
    FileUtils.rm_f(temporary_path)
  end
end