script to generate symlinks to a ramdisk (good for logs) TODO: * repair symlink targets after reboot * run automatically after chdir

ramir.rb

#!/usr/bin/env ruby

require 'pathname'

# global setup
ramdisk = Pathname.new( Dir.home(ENV['USER']) ).join('tmp')

if File.read('/etc/mtab').lines.grep(%r~ #{ramdisk} ~).empty?
  system "mount", ramdisk.to_s
end

arg = ARGV.shift || raise("must give directory to mirror")
arg = Pathname.new(arg).expand_path
arg.file? && raise("is a file: #{arg}")

logs = ramdisk.join(arg.basename)

if arg.directory?
  Pathname.glob(arg.join('*.log')).each do |old|
    system "rm", "-i", old.to_s
  end
  arg.children.empty? || raise("still contains files: #{arg}\n#{arg.children.join(' ')}")
  system "rmdir", arg.to_s
end


name = arg.dirname.basename
log = logs.join name
system "mkdir", '-p', log.to_s
system "ln", "-s", log.to_s, arg.to_s