require 'tempfile' module Puppet::Parser::Functions newfunction(:validate_augeas, :doc => <<-'ENDHEREDOC') do |args| Perform validation of a string using an Augeas lens The first argument of this function should be a string to test, and the second argument should be the name of the Augeas lens to use. If Augeas fails to parse the string with the lens, the compilation will abort with a parse error. A third argument can be specified, listing paths which should not be found in the file. The `$file` variable points to the location of the temporary file being tested in the Augeas tree. For example, if you want to make sure your passwd content never contains a user `foo`, you could write: validate_augeas($passwdcontent, 'Passwd.lns', ['$file/foo']) Or if you wanted to ensure that no users used the '/bin/barsh' shell, you could use: validate_augeas($passwdcontent, 'Passwd.lns', ['$file/*[shell="/bin/barsh"]'] If a fourth argument is specified, this will be the error message raised and seen by the user. A helpful error message can be returned like this: validate_augeas($sudoerscontent, 'Sudoers.lns', [], 'Failed to validate sudoers content with Augeas') ENDHEREDOC unless Puppet.features.augeas? raise Puppet::ParseError, ("validate_augeas(): this function requires the augeas feature. See http://projects.puppetlabs.com/projects/puppet/wiki/Puppet_Augeas#Pre-requisites for how to activate it.") end if (args.length < 2) or (args.length > 4) then raise Puppet::ParseError, ("validate_augeas(): wrong number of arguments (#{args.length}; must be 2, 3, or 4)") end msg = args[3] || "validate_augeas(): Failed to validate content against #{args[1].inspect}" require 'augeas' aug = Augeas::open(nil, nil, Augeas::NO_MODL_AUTOLOAD) begin content = args[0] # Test content in a temporary file tmpfile = Tempfile.new("validate_augeas") begin tmpfile.write(content) ensure tmpfile.close end # Check for syntax lens = args[1] aug.transform( :lens => lens, :name => 'Validate_augeas', :incl => tmpfile.path ) aug.load! unless aug.match("/augeas/files#{tmpfile.path}//error").empty? error = aug.get("/augeas/files#{tmpfile.path}//error/message") msg += " with error: #{error}" raise Puppet::ParseError, (msg) end # Launch unit tests tests = args[2] || [] aug.defvar('file', "/files#{tmpfile.path}") tests.each do |t| msg += " testing path #{t}" raise Puppet::ParseError, (msg) unless aug.match(t).empty? end ensure aug.close tmpfile.unlink end end end