chef cookbook diff

cookbookdiff.py

#!/usr/bin/env python
'''\
Usage: cookbookdiff COOKBOOK_NAME COOKBOOK_VER LOCAL_PATH [--nocolor]
Diff your LOCAL_PATH against what is on the chef server for a
given cookbook and version.

  --nocolor: don't pipe output through 'colordiff' (in case you want to pipe to something else)

Examples:
  cookbookdiff percona_toolkit 0.0.4 ~/chef-repo/cookbooks/percona_toolkit
  cookbookdiff percona_toolkit 0.0.4 ~/chef-repo/cookbooks/percona_toolkit --nocolor
'''

import os

def system(cmd):
    print "#", cmd
    os.system(cmd)

def main(name, ver, local, color):
    system("rm -rf /tmp/%s-%s" % (name, ver))
    system("knife cookbook download %s %s -d /tmp/" % (name, ver))

    pipeoutput = "| colordiff" if color else ""
    system("diff -ur %s /tmp/%s-%s %s" % (local, name, ver, pipeoutput))

if __name__ == "__main__":
    import sys
    sys.argv.pop(0)
    try:
        (name, ver, local) = sys.argv[:3]
        sys.argv = sys.argv[3:]
    except ValueError:
        print __doc__
        raise SystemExit(1)

    color = '--nocolor' not in sys.argv

    main(name, ver, local, color)

cookbookdiff.rb

require 'chef/knife'

class CookbookDiff < Chef::Knife
  banner "knife cookbook diff NAME VERSION LOCALPATH"

  option :nocolor,
    :long => '--nocolor',
    :boolean => true,
    :description => "Turn off colordiff (if you don't have it or want to pipe to something else)"

  def run
    name, ver, local = name_args
    if [name,ver,local].include?(nil)
      show_usage
      exit 1
    end

    pipeoutput = config[:nocolor] ? "" : "| colordiff"
    system("rm -rf /tmp/#{name}-#{ver}")
    system("knife cookbook download #{name} #{ver} -d /tmp/")
    system("diff -ur #{local} /tmp/#{name}-#{ver} #{pipeoutput}")
  end
end