(PUP-11452) Shell out to list packages in puppetserver_gem

Prior to this commit, the puppetserver_gem listed local packages using
the GEM command line, which resulted in innacurate results if a gem was
already loaded. This commit switches the listing of puppetserver gems to
use the shell command.

Author: Jarret Lavallee

lib/puppet/provider/package/puppetserver_gem.rb

@@ -53,7 +53,7 @@ def self.gemlist(options)
     end
 
     if options[:local]
-      list = execute_rubygems_list_command(gem_regex)
+      list = execute_rubygems_list_command(command_options)
     else
       begin
         list = puppetservercmd(command_options)
@@ -137,7 +137,7 @@ def uninstall
   # for example: json (1.8.3 java)
   # but java platform gems should not be managed by this (or any) provider.
 
-  def self.execute_rubygems_list_command(gem_regex)
+  def self.execute_rubygems_list_command(command_options)
     puppetserver_default_gem_home            = '/opt/puppetlabs/server/data/puppetserver/jruby-gems'
     puppetserver_default_vendored_jruby_gems = '/opt/puppetlabs/server/data/puppetserver/vendored-jruby-gems'
     puppet_default_vendor_gems               = '/opt/puppetlabs/puppet/lib/ruby/vendor_gems'
@@ -157,24 +157,15 @@ def self.execute_rubygems_list_command(gem_regex)
       gem_env['GEM_PATH'] = puppetserver_conf['jruby-puppet'].key?('gem-path') ? puppetserver_conf['jruby-puppet']['gem-path'].join(':') : puppetserver_default_gem_path
     end
     gem_env['GEM_SPEC_CACHE'] = "/tmp/#{$$}"
-    Gem.paths = gem_env
-
-    sio_inn = StringIO.new
-    sio_out = StringIO.new
-    sio_err = StringIO.new
-    stream_ui = Gem::StreamUI.new(sio_inn, sio_out, sio_err, false)
-    gem_list_cmd = Gem::Commands::ListCommand.new
-    gem_list_cmd.options[:domain] = :local
-    gem_list_cmd.options[:args] = [gem_regex] if gem_regex
-    gem_list_cmd.ui = stream_ui
-    gem_list_cmd.execute
+
+    # Remove the 'gem' from the command_options
+    command_options.shift
+    gem_out = execute_gem_command(Puppet::Type::Package::ProviderPuppet_gem.provider_command, command_options, gem_env)
 
     # There is no method exclude default gems from the local gem list,
     # for example: psych (default: 2.2.2)
     # but default gems should not be managed by this (or any) provider.
-    gem_list = sio_out.string.lines.reject { |gem| gem =~ / \(default\: / }
+    gem_list = gem_out.lines.reject { |gem| gem =~ / \(default\: / }
     gem_list.join("\n")
-  ensure
-    Gem.clear_paths
   end
 end

spec/unit/provider/package/puppetserver_gem_spec.rb

@@ -105,9 +105,9 @@
 
   describe ".gemlist" do
     context "listing installed packages" do
-      it "uses the puppet rubygems library to list local gems" do
+      it "uses the puppet_gem provider_command to list local gems" do
         expected = { name: 'world_airports', provider: :puppetserver_gem, ensure: ['1.1.3'] }
-        expect(described_class).to receive(:execute_rubygems_list_command).with(nil).and_return(File.read(my_fixture('gem-list-local-packages')))
+        expect(described_class).to receive(:execute_rubygems_list_command).with(['gem', 'list', '--local']).and_return(File.read(my_fixture('gem-list-local-packages')))
         expect(described_class.gemlist({ local: true })).to include(expected)
       end
     end