~/bin/mkram - creating temporary ram-disk

gistfile1.rb

#!/usr/bin/env ruby
module MkRam
  class Path
    def initialize
      @path = File.expand_path( "~/ram" )
    end

    def to_s
      @path
    end
  end

  class Options
    def initialize( args )
      @unmount_only = args.include?( "-u" )
      @size = ( args.first || 16 ).to_i
      @quiet = args.include?( "-q" )
    end

    attr_reader :unmount_only, :size, :quiet
  end

  class Runner
    def initialize( args )
      @path = Path.new
      @options = Options.new( args )
    end

    def run
      result = if @options.unmount_only
                 self.unmount
               else
                 self.mount
               end

      self.lsof unless result
    end


  protected

    def unmount
      if mounted?
        log( "Trying to unmount #{path}.." )
        system( "sudo umount #{path} 2>&1 >/dev/null" )
        if mounted?
          log( "Failed to unmount" )
          false
        else
          log( "Unmounted successfully" )
          true
        end
      else
        true
      end
    end

    def mount
      if !mounted? || self.unmount
        log( "Mounting #{size}M into #{path}.." )
        system( "sudo mount -t tmpfs -o size=#{size}M #{path} #{path}" )
        true
      else
        false
      end
    end

    def mounted?
      ( `mount | grep #{path} | wc -l` ).to_i > 0
    end

    def path
      @path.to_s
    end

    def size
      @options.size
    end

    def lsof
      system( "lsof #{path}" ) unless @options.quiet
    end

    def log( msg )
      puts msg unless @options.quiet
    end
  end
end

if $0 == __FILE__
  MkRam::Runner.new( ARGV ).run
end