Create a hierarchy of files and directories based on the output of find

make-dir-hierarchy.rb

#!/bin/env ruby
#
# Given output from find(1) listing files and directories, reproduce that
# hierarchy with random data in the files.
#
# Usage: ruby make-dir-hierarchy.rb [find-output-file]
#

require 'securerandom'

def make_directory(path)
  puts "mkdir #{path}"
  Dir.mkdir(path) unless File.directory?(path)
end

def make_file(path, size)
  dirname = File.dirname(path)
  Dir.mkdir(dirname) unless File.directory?(dirname)  # nneeded

  puts "creating #{path} with #{size} bytes"
  File.open(path, "w") { |fd| fd.puts SecureRandom.hex(size / 2) }
end

# Each line looks something like:
# 7306719   8 -rw-rw-r--  1 bart staff  2586 Feb 20 13:23 ./core/misc/displace.js
def process_line(line)
  toks = line.split
  mode_str = toks[2]
  size = toks[6].to_i
  path = toks[-1]   # does not handle spaces in names

  case mode_str
  when /^d/
    make_directory(path)
  when /^-/
    make_file(path, size)
  else
    # we shouldn't see any symlinks??
    puts "Unknown file mode: #{mode_str} for #{path}"
  end
end

ARGF.each do |line|
  process_line(line)
end