Graphic diff of file across multiple remote machines via SSH

ddiff

#!/usr/bin/env ruby
#osx: brew install diffuse
#linux rpm: rpm install diffuse
require 'optparse'
require 'pp'

options = {}
OptionParser.new do |parser|
	parser.define_head "Distributed Diff"
	parser.on('-h', '--hosts HOSTS') do |v|
		options[:hosts] = v
	end
	parser.on('-f', '--file FILE') do |v|
		options[:file] = v
	end
end.parse!

unless options.include?(:hosts)
	puts("You need to specify hosts with --hosts")
	exit! 1
end

unless options.include?(:file)
	puts("You need to specify a file path with --file")
	exit! 1
end
hosts = options[:hosts]
file = options[:file]

host_list = hosts.split(",")

def create_ssh_command(host,file)
	#if osx, need to use the brew version of ssh /usr/local/bin/ssh
	return "<(ssh -ttt -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o ConnectTimeout=5 #{host} sudo cat #{file})"
end

def create_diff_command(diff_cmd,host_list,file)
	host_list.each do |host|
		diff_cmd += " " + create_ssh_command(host,file)
	end
	return diff_cmd
end

diff_cmd = create_diff_command("/bin/bash -c 'diffuse",host_list, file) + "'"
exec diff_cmd
#diffuse messes up terminal.  run 'reset' to fix after running this.