[PROF-7145] Remove support for profiling Ruby 2.2

Rakefile

@@ -21,7 +21,7 @@ namespace :spec do
                         ' spec/**/{auto_instrument,opentelemetry}_spec.rb'
     t.rspec_opts = args.to_a.join(' ')
   end
-  if RUBY_ENGINE == 'ruby' && OS.linux? && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.2.0')
+  if RUBY_ENGINE == 'ruby' && OS.linux? && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.3.0')
     # "bundle exec rake compile" currently only works on MRI Ruby on Linux
     Rake::Task[:main].enhance([:clean])
     Rake::Task[:main].enhance([:compile])

ddtrace.gemspec

@@ -41,6 +41,7 @@ Gem::Specification.new do |spec|
     ]]
     .select { |fn| File.file?(fn) } # We don't want directories, only files
     .reject { |fn| fn.end_with?('.so', '.bundle') } # Exclude local profiler binary artifacts
+    .reject { |fn| fn.end_with?('skipped_reason.txt') } # Generated by profiler; should never be distributed
 
   spec.executables   = ['ddtracerb']
   spec.require_paths = ['lib']

ext/ddtrace_profiling_native_extension/native_extension_helpers.rb

@@ -88,7 +88,7 @@ def self.unsupported_reason
             on_macos? ||
             on_unknown_os? ||
             not_on_amd64_or_arm64? ||
-            on_ruby_2_1? ||
+            on_ruby_2_1_or_2_2? ||
             expected_to_use_mjit_but_mjit_is_disabled? ||
             libdatadog_not_available? ||
             libdatadog_not_usable?
@@ -260,13 +260,13 @@ def self.pkg_config_missing?(command: $PKGCONFIG) # rubocop:disable Style/Global
           architecture_not_supported unless RUBY_PLATFORM.start_with?('x86_64', 'aarch64', 'arm64')
         end
 
-        private_class_method def self.on_ruby_2_1?
+        private_class_method def self.on_ruby_2_1_or_2_2?
           ruby_version_not_supported = explain_issue(
-            'the profiler only supports Ruby 2.2 or newer.',
+            'the profiler only supports Ruby 2.3 or newer.',
             suggested: UPGRADE_RUBY,
           )
 
-          ruby_version_not_supported if RUBY_VERSION.start_with?('2.1.')
+          ruby_version_not_supported if RUBY_VERSION.start_with?('2.1.', '2.2.')
         end
 
         # On some Rubies, we require the mjit header to be present. If Ruby was installed without MJIT support, we also skip

integration/apps/rack/spec/integration/basic_spec.rb

@@ -11,10 +11,9 @@
     it { is_expected.to be_a_kind_of(Net::HTTPOK) }
   end
 
-  let(:expected_profiler_available) { RUBY_VERSION >= '2.2' }
+  let(:expected_profiler_available) { RUBY_VERSION >= '2.3' }
 
   let(:expected_profiler_threads) do
-    # NOTE: Threads can't be named on Ruby 2.2
     contain_exactly('Datadog::Profiling::Collectors::OldStack', 'Datadog::Profiling::Scheduler') unless RUBY_VERSION < '2.3'
   end
 

integration/apps/sinatra2-classic/spec/integration/basic_spec.rb

@@ -11,10 +11,9 @@
     it { is_expected.to be_a_kind_of(Net::HTTPOK) }
   end
 
-  let(:expected_profiler_available) { RUBY_VERSION >= '2.2' }
+  let(:expected_profiler_available) { RUBY_VERSION >= '2.3' }
 
   let(:expected_profiler_threads) do
-    # NOTE: Threads can't be named on Ruby 2.2
     contain_exactly('Datadog::Profiling::Collectors::OldStack', 'Datadog::Profiling::Scheduler') unless RUBY_VERSION < '2.3'
   end
 

integration/apps/sinatra2-modular/spec/integration/basic_spec.rb

@@ -11,10 +11,9 @@
     it { is_expected.to be_a_kind_of(Net::HTTPOK) }
   end
 
-  let(:expected_profiler_available) { RUBY_VERSION >= '2.2' }
+  let(:expected_profiler_available) { RUBY_VERSION >= '2.3' }
 
   let(:expected_profiler_threads) do
-    # NOTE: Threads can't be named on Ruby 2.2
     contain_exactly('Datadog::Profiling::Collectors::OldStack', 'Datadog::Profiling::Scheduler') unless RUBY_VERSION < '2.3'
   end
 

integration/images/include/build_ddtrace_profiling_native_extension.rb

@@ -1,8 +1,8 @@
 #!/usr/bin/env ruby
 
 if local_gem_path = ENV['DD_DEMO_ENV_GEM_LOCAL_DDTRACE']
-  if RUBY_VERSION.start_with?('2.1.')
-    puts "\n== Skipping build of profiler native extension on Ruby 2.1 =="
+  if (RUBY_VERSION.start_with?('2.1.') || RUBY_VERSION.start_with?('2.2.'))
+    puts "\n== Skipping build of profiler native extension on Ruby 2.1/2.2 =="
   else
     puts "\n== Building profiler native extension =="
     success =

spec/datadog/profiling/native_extension_helpers_spec.rb

@@ -129,8 +129,8 @@
         end
 
         shared_examples 'supported ruby validation' do
-          context 'when not on Ruby 2.1' do
-            before { stub_const('RUBY_VERSION', '2.2.0') }
+          context 'when not on Ruby 2.1 or 2.2' do
+            before { stub_const('RUBY_VERSION', '2.3.0') }
 
             shared_examples 'libdatadog available' do
               context 'when libdatadog fails to activate' do
@@ -191,7 +191,13 @@
           context 'when on Ruby 2.1' do
             before { stub_const('RUBY_VERSION', '2.1.10') }
 
-            it { is_expected.to include 'profiler only supports Ruby 2.2 or newer' }
+            it { is_expected.to include 'profiler only supports Ruby 2.3 or newer' }
+          end
+
+          context 'when on Ruby 2.2' do
+            before { stub_const('RUBY_VERSION', '2.2.10') }
+
+            it { is_expected.to include 'profiler only supports Ruby 2.3 or newer' }
           end
         end
 

spec/datadog/profiling/spec_helper.rb

@@ -34,7 +34,7 @@ def build_stack_sample(
   def skip_if_profiling_not_supported(testcase)
     testcase.skip('Profiling is not supported on JRuby') if PlatformHelpers.jruby?
     testcase.skip('Profiling is not supported on TruffleRuby') if PlatformHelpers.truffleruby?
-    testcase.skip('Profiling is not supported on Ruby 2.1') if RUBY_VERSION.start_with?('2.1.')
+    testcase.skip('Profiling is not supported on Ruby 2.1/2.2') if RUBY_VERSION.start_with?('2.1.', '2.2.')
 
     # Profiling is not officially supported on macOS due to missing libdatadog binaries,
     # but it's still useful to allow it to be enabled for development.