When USB drives are mounted, check them for a script called plz_verify.sh and run it if found.

plz_verify

#!/usr/bin/env ruby

# When USB drives are mounted, check them for a script called plz_verify.sh
# and run it if found.
#
# symlink all USB volumes you want to check into ~/usb
# ln -s /Volumes/mmb ~/usb/mmb

require 'logger'
require 'set'

logger = Logger.new(STDOUT)
state = Set.new

while true do
  # the extra stars are for symlinks
  current = Set.new(Dir.glob("#{Dir.home}/usb/**/*/**/plz_verify.sh"))
  gone = state - current
  new = current - state
  state = current

  gone.each do |script|
    logger.info("#{script} unmounted")
  end

  new.each do |script|
    logger.info("running #{script}")
    script_contents = File.read(script)
    IO.popen('sh', 'w') do |io|
      io.write(script_contents)
    end
  end

  sleep 2
end