require 'puppet/util/execution' module Puppet::Parser::Functions newfunction(:validate_cmd, :doc => <<-'ENDHEREDOC') do |args| Perform validation of a string with an external command. The first argument of this function should be a string to test, and the second argument should be a path to a test command taking a file as last argument. If the command, launched against a tempfile containing the passed string, returns a non-null value, compilation will abort with a parse error. If a third argument is specified, this will be the error message raised and seen by the user. A helpful error message can be returned like this: Example: validate_cmd($sudoerscontent, '/usr/sbin/visudo -c -f', 'Visudo failed to validate sudoers content') ENDHEREDOC if (args.length < 2) or (args.length > 3) then raise Puppet::ParseError, ("validate_cmd(): wrong number of arguments (#{args.length}; must be 2 or 3)") end msg = args[2] || "validate_cmd(): failed to validate content with command #{args[1].inspect}" content = args[0] checkscript = args[1] # Test content in a temporary file tmpfile = Tempfile.new("validate_cmd") begin tmpfile.write(content) if Puppet::Util::Execution.respond_to?('execute') Puppet::Util::Execution.execute("#{checkscript} #{tmpfile.path}") else Puppet::Util.execute("#{checkscript} #{tmpfile.path}") end rescue Puppet::ExecutionFailure => detail msg += "\n#{detail}" raise Puppet::ParseError, msg ensure tmpfile.unlink end end end