Class: RunLoop::Directory

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

Overview

Class for performing operations on directories.

Class Method Summary collapse

Class Method Details

.directory_digest(path, options = {}) ⇒ Object

Computes the digest of directory.

Parameters:

  • path

    A path to a directory.

  • options (defaults to: {})

    Control the behavior of the method.

Options Hash (options):

  • :handle_errors_by (Object) — default: :raising

    Controls what to do when File.read causes an error. The default behavior is to raise. Other options are: :logging and :ignoring. Logging will only happen if running in debug mode.

Raises:

  • ArgumentError When `path` is not a directory or path does not exist.

  • ArgumentError When options has n unsupported value.


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# File 'lib/run_loop/directory.rb', line 33

def self.directory_digest(path, options={})
  default_options = {
    :handle_errors_by => :raising
  }

  merged_options = default_options.merge(options)
  handle_errors_by = merged_options[:handle_errors_by]
  unless [:raising, :logging, :ignoring].include?(handle_errors_by)
    raise ArgumentError,
%Q{Expected :handle_errors_by to be :raising, :logging, or :ignoring;
found '#{handle_errors_by}'
}
  end

  unless File.exist?(path)
    raise ArgumentError, "Expected '#{path}' to exist"
  end

  unless File.directory?(path)
    raise ArgumentError, "Expected '#{path}' to be a directory"
  end

  entries = self.recursive_glob_for_entries(path)

  if entries.empty?
    raise ArgumentError, "Expected a non-empty dir at '#{path}' found '#{entries}'"
  end

  debug = RunLoop::Environment.debug?

  sha = OpenSSL::Digest::SHA256.new
  entries.each do |file|
    unless self.skip_file?(file, 'SHA1', debug)
      begin
        sha << File.read(file)
      rescue => e
        case handle_errors_by
        when :logging
          message =
%Q{RunLoop::Directory.directory_digest raised an error:

     #{e}

   while trying to find the SHA of this file:

     #{file}

   This is not a fatal error; it can be ignored.
}
          RunLoop.log_debug(message)
        when :raising
          raise e.class, e.message
        when :ignoring
           # nop
        else
           # nop
        end
      end
    end
  end
  sha.hexdigest
end

.recursive_glob_for_entries(base_dir) ⇒ Object

Dir.glob ignores files that start with '.', but we often need to find dotted files and directories.

Ruby 2.* does the right thing by ignoring '..' and '.'.

Ruby < 2.0 includes '..' and '.' in results which causes problems for some of run-loop's internal methods. In particular `reset_app_sandbox`.


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# File 'lib/run_loop/directory.rb', line 16

def self.recursive_glob_for_entries(base_dir)
  Dir.glob("#{base_dir}/{**/.*,**/*}").select do |entry|
    !(entry.end_with?('..') || entry.end_with?('.'))
  end
end

.size(path, format) ⇒ Object


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# File 'lib/run_loop/directory.rb', line 96

def self.size(path, format)

  allowed_formats = [:bytes, :kb, :mb, :gb]
  unless allowed_formats.include?(format)
    raise ArgumentError, "Expected '#{format}' to be one of #{allowed_formats.join(', ')}"
  end

  unless File.exist?(path)
    raise ArgumentError, "Expected '#{path}' to exist"
  end

  unless File.directory?(path)
    raise ArgumentError, "Expected '#{path}' to be a directory"
  end

  entries = self.recursive_glob_for_entries(path)

  if entries.empty?
    raise ArgumentError, "Expected a non-empty dir at '#{path}' found '#{entries}'"
  end

  size = self.iterate_for_size(entries)

  case format
    when :bytes
      size
    when :kb
      size/1000.0
    when :mb
      size/1000.0/1000.0
    when :gb
      size/1000.0/1000.0/1000.0
    else
      # Not expected to reach this.
      size
  end
end