cloudlib.no-yaml-anchors.patch

commit d9d38c14c11fa7c15eae01c96f839f2278021ada (origin/brody/no-yaml-anchors, brody/no-yaml-anchors)
Author: Andy Brody <andrew.brody@gsa.gov>
Date:   Mon Aug 5 17:31:34 2019 -0400

    WIP

diff --git a/cloudlib/lib/cloudlib/lambda.rb b/cloudlib/lib/cloudlib/lambda.rb
index 94b75d46..dcb6e8dd 100644
--- a/cloudlib/lib/cloudlib/lambda.rb
+++ b/cloudlib/lib/cloudlib/lambda.rb
@@ -18,6 +18,9 @@ module Cloudlib
     CloudlibSourceConfigName = '.cloudlib-source.yaml'
     CloudlibYamlName = 'cloudlib.yaml'
 
+    # Version upgrade ratchet
+    ConfigProtocolVersion = 2
+
     def initialize
       log.debug('#initialize')
     end
@@ -242,7 +245,10 @@ module Cloudlib
 
     def cloudlib_yaml_data!
       log.debug("Loading main config from #{cloudlib_yaml_path.inspect}")
-      YAML.safe_load(File.read(cloudlib_yaml_path), aliases: true)
+      data = YAML.safe_load(File.read(cloudlib_yaml_path))
+      verify_config_protocol_version(data)
+      populate_aliases!(data)
+      data
     end
 
     # @return [Hash]
@@ -362,6 +368,7 @@ module Cloudlib
       if ref.start_with?('-')
         raise ArgumentError.new('Ref cannot start with -')
       end
+
       cmd = %W[git rev-parse --verify #{ref} --]
       log.debug('+ ' + cmd.join(' '))
       Subprocess.check_output(cmd).chomp
@@ -433,5 +440,44 @@ module Cloudlib
                                   cl_source_path.inspect)
       end
     end
+
+    # Given a data hash loaded from YAML, look for any environment aliases and
+    # turn them into actual environments.
+    def populate_aliases!(data)
+      return unless data.include?('environments')
+
+      new_envs = {}
+
+      data.fetch('environments').each_pair do |env, env_data|
+        # copy primary env to output
+        new_envs[env] = env_data
+
+        env_data.fetch('aliases', []).each do |alias_name|
+          # Create a new environment under the alias name, copying everything
+          # except the list of aliases.
+          new_envs[alias_name] = env_data.reject { |x| x == 'aliases' }
+        end
+      end
+
+      data['environments'] = new_envs
+
+      nil
+    end
+
+    # This can be used as a ratchet to ensure that users have newer versions of
+    # Cloudlib. Returns the protocol version from
+    # data['config_protocol_version'].
+    # @param [Hash] data
+    def verify_config_protocol_version(data)
+      theirs = data.fetch('config_protocol_version', 0)
+      if theirs > ConfigProtocolVersion
+        raise Cloudlib::CLIError.new(
+          "Config protocol version from config #{theirs.inspect} exceeds" +
+          ' version from this Cloudlib codebase. Try upgrading cloudlib?'
+        )
+      end
+
+      theirs
+    end
   end
 end