Awesome

Puppet Function Updater

Port legacy Puppet 3.x functions to the new function API automatically.

Run this command with a space separated list of either function file paths, or directories containing functions. If omitted, it will default to porting all the legacy functions, so you can just run this in the root of a Puppet module and it will do the right thing.

Installation

$ gem install puppet-function-updater

Usage

Run the command puppet_function_updater in the root of a Puppet module, then inspect all the generated functions for suitability when it’s done. If you pass the --clean argument it will delete the legacy function file from disk after validating that the new function works.

You might see some warnings. Many can be ignored. For example, the following warning just means that the function attempted to require a library file outside of the the function block. You might evaluate whether you could remove the call or move it inside the function declaration so it's lazily loaded.

INFO: Creating lib/puppet/functions/stdlib/deep_merge.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/parser/functions (ignored)

On the other hand, errors like below indicate that the function code doesn't parse properly after porting. It's generally an issue with the original source code.

INFO: Creating lib/puppet/functions/stdlib/validate_x509_rsa_key_pair.rb
ERROR: Oh crap; the generated function isn't valid Ruby code!
ERROR: <compiled>:47: dynamic constant assignment
    NUM_ARGS = 2 unless defined? NUM_ARGS
             ^

After porting

Two files will be generated, the function file and the spec test for that function.

lib/puppet/functions/<namespace>/<function>.rb
spec/functions/<namespace>_<function>_spec.rb

After porting, you should inspect the generated files. At a minimum, you'll want to clean up the documentation comments, but I'd also suggest reading a bit on the new function API and writing better dispatches to provide proper type checking and reduce the amount of manual argument validation your function must do.

The test simply validates that the function compiles and defines a function properly, so you'll also want to write more test cases. If your legacy function has unit tests, you might consider porting them to the new function, following the examples provided as comments.

See a tutorial on its usage on my blog.

Example:

[~/Projects/puppetlabs-stdlib]$ puppet_function_updater --verbose
INFO: Creating lib/puppet/functions/stdlib/abs.rb
INFO: Creating lib/puppet/functions/stdlib/any2array.rb
INFO: Creating lib/puppet/functions/stdlib/any2bool.rb
INFO: Creating lib/puppet/functions/stdlib/assert_private.rb
INFO: Creating lib/puppet/functions/stdlib/base64.rb
INFO: Creating lib/puppet/functions/stdlib/basename.rb
INFO: Creating lib/puppet/functions/stdlib/bool2num.rb
INFO: Creating lib/puppet/functions/stdlib/bool2str.rb
INFO: Creating lib/puppet/functions/stdlib/camelcase.rb
INFO: Creating lib/puppet/functions/stdlib/capitalize.rb
INFO: Creating lib/puppet/functions/stdlib/ceiling.rb
INFO: Creating lib/puppet/functions/stdlib/chomp.rb
INFO: Creating lib/puppet/functions/stdlib/chop.rb
INFO: Creating lib/puppet/functions/stdlib/clamp.rb
INFO: Creating lib/puppet/functions/stdlib/concat.rb
INFO: Creating lib/puppet/functions/stdlib/convert_base.rb
INFO: Creating lib/puppet/functions/stdlib/count.rb
INFO: Creating lib/puppet/functions/stdlib/deep_merge.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/parser/functions (ignored)
INFO: Creating lib/puppet/functions/stdlib/defined_with_params.rb
INFO: Creating lib/puppet/functions/stdlib/delete.rb
INFO: Creating lib/puppet/functions/stdlib/delete_at.rb
INFO: Creating lib/puppet/functions/stdlib/delete_regex.rb
INFO: Creating lib/puppet/functions/stdlib/delete_undef_values.rb
INFO: Creating lib/puppet/functions/stdlib/delete_values.rb
INFO: Creating lib/puppet/functions/stdlib/deprecation.rb
INFO: Creating lib/puppet/functions/stdlib/difference.rb
INFO: Creating lib/puppet/functions/stdlib/dig.rb
INFO: Creating lib/puppet/functions/stdlib/dig44.rb
INFO: Creating lib/puppet/functions/stdlib/dirname.rb
INFO: Creating lib/puppet/functions/stdlib/dos2unix.rb
INFO: Creating lib/puppet/functions/stdlib/downcase.rb
INFO: Creating lib/puppet/functions/stdlib/empty.rb
INFO: Creating lib/puppet/functions/stdlib/enclose_ipv6.rb
INFO: Creating lib/puppet/functions/stdlib/ensure_packages.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/parser/functions (ignored)
INFO: Creating lib/puppet/functions/stdlib/ensure_resource.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/parser/functions (ignored)
INFO: Creating lib/puppet/functions/stdlib/ensure_resources.rb
INFO: Creating lib/puppet/functions/stdlib/flatten.rb
INFO: Creating lib/puppet/functions/stdlib/floor.rb
INFO: Creating lib/puppet/functions/stdlib/fqdn_rand_string.rb
INFO: Creating lib/puppet/functions/stdlib/fqdn_rotate.rb
INFO: Creating lib/puppet/functions/stdlib/fqdn_uuid.rb
INFO: Creating lib/puppet/functions/stdlib/get_module_path.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/parser/functions (ignored)
INFO: Creating lib/puppet/functions/stdlib/getparam.rb
INFO: Creating lib/puppet/functions/stdlib/getvar.rb
INFO: Creating lib/puppet/functions/stdlib/glob.rb
INFO: Creating lib/puppet/functions/stdlib/grep.rb
INFO: Creating lib/puppet/functions/stdlib/has_interface_with.rb
INFO: Creating lib/puppet/functions/stdlib/has_ip_address.rb
INFO: Creating lib/puppet/functions/stdlib/has_ip_network.rb
INFO: Creating lib/puppet/functions/stdlib/has_key.rb
INFO: Creating lib/puppet/functions/stdlib/hash.rb
INFO: Creating lib/puppet/functions/stdlib/intersection.rb
INFO: Creating lib/puppet/functions/stdlib/is_absolute_path.rb
INFO: Creating lib/puppet/functions/stdlib/is_array.rb
INFO: Creating lib/puppet/functions/stdlib/is_bool.rb
INFO: Creating lib/puppet/functions/stdlib/is_domain_name.rb
INFO: Creating lib/puppet/functions/stdlib/is_email_address.rb
INFO: Creating lib/puppet/functions/stdlib/is_float.rb
INFO: Creating lib/puppet/functions/stdlib/is_function_available.rb
INFO: Creating lib/puppet/functions/stdlib/is_hash.rb
INFO: Creating lib/puppet/functions/stdlib/is_integer.rb
INFO: Creating lib/puppet/functions/stdlib/is_ip_address.rb
INFO: Creating lib/puppet/functions/stdlib/is_ipv4_address.rb
INFO: Creating lib/puppet/functions/stdlib/is_ipv6_address.rb
INFO: Creating lib/puppet/functions/stdlib/is_mac_address.rb
INFO: Creating lib/puppet/functions/stdlib/is_numeric.rb
INFO: Creating lib/puppet/functions/stdlib/is_string.rb
INFO: Creating lib/puppet/functions/stdlib/join.rb
INFO: Creating lib/puppet/functions/stdlib/join_keys_to_values.rb
INFO: Creating lib/puppet/functions/stdlib/keys.rb
INFO: Creating lib/puppet/functions/stdlib/load_module_metadata.rb
INFO: Creating lib/puppet/functions/stdlib/loadjson.rb
INFO: Creating lib/puppet/functions/stdlib/loadyaml.rb
INFO: Creating lib/puppet/functions/stdlib/lstrip.rb
INFO: Creating lib/puppet/functions/stdlib/max.rb
INFO: Creating lib/puppet/functions/stdlib/member.rb
INFO: Creating lib/puppet/functions/stdlib/merge.rb
INFO: Creating lib/puppet/functions/stdlib/min.rb
INFO: Creating lib/puppet/functions/stdlib/num2bool.rb
INFO: Creating lib/puppet/functions/stdlib/parsejson.rb
INFO: Creating lib/puppet/functions/stdlib/parseyaml.rb
INFO: Creating lib/puppet/functions/stdlib/pick.rb
INFO: Creating lib/puppet/functions/stdlib/pick_default.rb
INFO: Creating lib/puppet/functions/stdlib/prefix.rb
INFO: Creating lib/puppet/functions/stdlib/private.rb
INFO: Creating lib/puppet/functions/stdlib/pry.rb
INFO: Creating lib/puppet/functions/stdlib/pw_hash.rb
INFO: Creating lib/puppet/functions/stdlib/range.rb
INFO: Creating lib/puppet/functions/stdlib/regexpescape.rb
INFO: Creating lib/puppet/functions/stdlib/reject.rb
INFO: Creating lib/puppet/functions/stdlib/reverse.rb
INFO: Creating lib/puppet/functions/stdlib/round.rb
INFO: Creating lib/puppet/functions/stdlib/rstrip.rb
INFO: Creating lib/puppet/functions/stdlib/seeded_rand.rb
INFO: Creating lib/puppet/functions/stdlib/shell_escape.rb
INFO: Creating lib/puppet/functions/stdlib/shell_join.rb
INFO: Creating lib/puppet/functions/stdlib/shell_split.rb
INFO: Creating lib/puppet/functions/stdlib/shuffle.rb
INFO: Creating lib/puppet/functions/stdlib/size.rb
INFO: Creating lib/puppet/functions/stdlib/sort.rb
INFO: Creating lib/puppet/functions/stdlib/squeeze.rb
INFO: Creating lib/puppet/functions/stdlib/str2bool.rb
INFO: Creating lib/puppet/functions/stdlib/str2saltedsha512.rb
INFO: Creating lib/puppet/functions/stdlib/strftime.rb
INFO: Creating lib/puppet/functions/stdlib/strip.rb
INFO: Creating lib/puppet/functions/stdlib/suffix.rb
INFO: Creating lib/puppet/functions/stdlib/swapcase.rb
INFO: Creating lib/puppet/functions/stdlib/time.rb
INFO: Creating lib/puppet/functions/stdlib/to_bytes.rb
INFO: Creating lib/puppet/functions/stdlib/try_get_value.rb
INFO: Creating lib/puppet/functions/stdlib/type.rb
INFO: Creating lib/puppet/functions/stdlib/type3x.rb
INFO: Creating lib/puppet/functions/stdlib/union.rb
INFO: Creating lib/puppet/functions/stdlib/unique.rb
INFO: Creating lib/puppet/functions/stdlib/unix2dos.rb
INFO: Creating lib/puppet/functions/stdlib/upcase.rb
INFO: Creating lib/puppet/functions/stdlib/uriescape.rb
INFO: Creating lib/puppet/functions/stdlib/validate_absolute_path.rb
INFO: Creating lib/puppet/functions/stdlib/validate_array.rb
INFO: Creating lib/puppet/functions/stdlib/validate_augeas.rb
INFO: Creating lib/puppet/functions/stdlib/validate_bool.rb
WARN: The function attempted to load libraries outside the function block.
WARN: cannot load such file -- puppet/util/execution (ignored)
INFO: Creating lib/puppet/functions/stdlib/validate_cmd.rb
INFO: Creating lib/puppet/functions/stdlib/validate_domain_name.rb
INFO: Creating lib/puppet/functions/stdlib/validate_email_address.rb
INFO: Creating lib/puppet/functions/stdlib/validate_hash.rb
INFO: Creating lib/puppet/functions/stdlib/validate_integer.rb
INFO: Creating lib/puppet/functions/stdlib/validate_ip_address.rb
INFO: Creating lib/puppet/functions/stdlib/validate_ipv4_address.rb
INFO: Creating lib/puppet/functions/stdlib/validate_ipv6_address.rb
INFO: Creating lib/puppet/functions/stdlib/validate_numeric.rb
INFO: Creating lib/puppet/functions/stdlib/validate_re.rb
INFO: Creating lib/puppet/functions/stdlib/validate_slength.rb
INFO: Creating lib/puppet/functions/stdlib/validate_string.rb
INFO: Creating lib/puppet/functions/stdlib/validate_x509_rsa_key_pair.rb
ERROR: Oh crap; the generated function isn't valid Ruby code!
ERROR: <compiled>:47: dynamic constant assignment
    NUM_ARGS = 2 unless defined? NUM_ARGS
             ^
INFO: Creating lib/puppet/functions/stdlib/values.rb
INFO: Creating lib/puppet/functions/stdlib/values_at.rb
INFO: Creating lib/puppet/functions/stdlib/zip.rb
INFO: Functions generated. Please inspect for suitability and then
INFO: update any Puppet code with the new function names.
INFO: See https://puppet.com/docs/puppet/latest/custom_functions_ruby.html
INFO: for more information about Puppet's modern Ruby function API.

Limitations

This is super early in development and has not yet been battle tested.

Disclaimer

I take no liability for the use of this tool.

Contact

binford2k@gmail.com