Drop support for ruby < 2.3; update and unskip distrib tests

Rakefile

@@ -124,10 +124,10 @@ task 'gem:native' do
         "invoked on macos with ruby #{RUBY_VERSION}. The ruby macos artifact " \
         "build should be running on ruby 2.5."
     end
-    system "rake cross native gem RUBY_CC_VERSION=2.6.0:2.5.0:2.4.0:2.3.0:2.2.2 V=#{verbose} GRPC_CONFIG=#{grpc_config}"
+    system "rake cross native gem RUBY_CC_VERSION=2.6.0:2.5.0:2.4.0:2.3.0 V=#{verbose} GRPC_CONFIG=#{grpc_config}"
   else
     Rake::Task['dlls'].execute
-    docker_for_windows "gem update --system --no-document && bundle && rake cross native gem RUBY_CC_VERSION=2.6.0:2.5.0:2.4.0:2.3.0:2.2.2 V=#{verbose} GRPC_CONFIG=#{grpc_config}"
+    docker_for_windows "gem update --system --no-document && bundle && rake cross native gem RUBY_CC_VERSION=2.6.0:2.5.0:2.4.0:2.3.0 V=#{verbose} GRPC_CONFIG=#{grpc_config}"
   end
 end
 

grpc.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.description   = 'Send RPCs from Ruby using GRPC'
   s.license       = 'Apache-2.0'
 
-  s.required_ruby_version = '>= 2.0.0'
+  s.required_ruby_version = '>= 2.3.0'
 
   s.files = %w( Makefile .yardopts )
   s.files += %w( etc/roots.pem )

templates/grpc.gemspec.template

@@ -15,7 +15,7 @@
     s.description   = 'Send RPCs from Ruby using GRPC'
     s.license       = 'Apache-2.0'
 
-    s.required_ruby_version = '>= 2.0.0'
+    s.required_ruby_version = '>= 2.3.0'
 
     s.files = %w( Makefile .yardopts )
     s.files += %w( etc/roots.pem )

tools/dockerfile/distribtest/ruby_centos6_x64/Dockerfile

@@ -22,15 +22,15 @@ RUN yum install -y tar which
 RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 RUN curl -sSL https://get.rvm.io | bash -s stable
 
-# Install Ruby 2.2
+# Install Ruby 2.3
 # Running the installation twice to work around docker issue when using overlay.
 # https://github.com/docker/docker/issues/10180
-RUN (/bin/bash -l -c "rvm install ruby-2.2.10") || (/bin/bash -l -c "rvm install ruby-2.2.10")
+RUN (/bin/bash -l -c "rvm install ruby-2.3.8") || (/bin/bash -l -c "rvm install ruby-2.3.8")
-RUN /bin/bash -l -c "rvm use --default ruby-2.2.10"
+RUN /bin/bash -l -c "rvm use --default ruby-2.3.8"
 RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
 RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.2.10' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.3.8' >> ~/.bashrc"
-RUN /bin/bash -l -c "gem install bundler -v 1.17.3 --no-document"
+RUN /bin/bash -l -c "gem install bundler --no-document"
 
 RUN mkdir /var/local/jenkins
 

tools/dockerfile/distribtest/ruby_centos7_x64/Dockerfile

@@ -20,13 +20,13 @@ RUN yum update && yum install -y curl tar which
 RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 RUN curl -sSL https://get.rvm.io | bash -s stable
 
-# Install Ruby 2.2
+# Install Ruby 2.3
-RUN /bin/bash -l -c "rvm install ruby-2.2.10"
+RUN /bin/bash -l -c "rvm install ruby-2.3.8"
-RUN /bin/bash -l -c "rvm use --default ruby-2.2.10"
+RUN /bin/bash -l -c "rvm use --default ruby-2.3.8"
 RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
 RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.2.10' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.3.8' >> ~/.bashrc"
-RUN /bin/bash -l -c "gem install bundler -v 1.17.3 --no-document"
+RUN /bin/bash -l -c "gem install bundler --no-document"
 
 RUN mkdir /var/local/jenkins
 

tools/dockerfile/distribtest/ruby_fedora20_x64/Dockerfile

@@ -21,15 +21,15 @@ RUN yum clean all && yum update -y && yum distro-sync -y && yum install -y opens
 RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 RUN curl -sSL https://get.rvm.io | bash -s stable
 
-# Install Ruby 2.2
+# Install Ruby 2.3
 # Running the installation twice to work around docker issue when using overlay.
 # https://github.com/docker/docker/issues/10180
-RUN (/bin/bash -l -c "rvm install ruby-2.2.10") || (/bin/bash -l -c "rvm install ruby-2.2.10")
+RUN (/bin/bash -l -c "rvm install ruby-2.3.8") || (/bin/bash -l -c "rvm install ruby-2.3.8")
-RUN /bin/bash -l -c "rvm use --default ruby-2.2.10"
+RUN /bin/bash -l -c "rvm use --default ruby-2.3.8"
 RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
 RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.2.10' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.3.8' >> ~/.bashrc"
-RUN /bin/bash -l -c "gem install bundler -v 1.17.3 --no-document"
+RUN /bin/bash -l -c "gem install bundler --no-document"
 
 RUN mkdir /var/local/jenkins
 

tools/dockerfile/distribtest/ruby_fedora21_x64/Dockerfile

@@ -26,13 +26,13 @@ RUN yum clean all && yum update -y && yum distro-sync -y && yum install -y opens
 RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
 RUN curl -sSL https://get.rvm.io | bash -s stable
 
-# Install Ruby 2.2
+# Install Ruby 2.3
-RUN /bin/bash -l -c "rvm install ruby-2.2.10"
+RUN /bin/bash -l -c "rvm install ruby-2.3.8"
-RUN /bin/bash -l -c "rvm use --default ruby-2.2.10"
+RUN /bin/bash -l -c "rvm use --default ruby-2.3.8"
 RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
 RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.2.10' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.3.8' >> ~/.bashrc"
-RUN /bin/bash -l -c "gem install bundler -v 1.17.3 --no-document"
+RUN /bin/bash -l -c "gem install bundler --no-document"
 
 RUN mkdir /var/local/jenkins
 

tools/dockerfile/distribtest/ruby_jessie_x64_ruby_2_2/Dockerfile

@@ -1,40 +0,0 @@
-# Copyright 2015 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-FROM debian:jessie
-
-# Install Git and basic packages.
-RUN apt-get update && apt-get install -y \
-  curl \
-  gcc && apt-get clean
-
-#==================
-# Ruby dependencies
-
-# Install rvm
-RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
-RUN \curl -sSL https://get.rvm.io | bash -s stable
-
-# Install Ruby 2.2
-RUN /bin/bash -l -c "rvm install ruby-2.2.10"
-RUN /bin/bash -l -c "rvm use --default ruby-2.2.10"
-RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
-RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.2.10' >> ~/.bashrc"
-RUN /bin/bash -l -c "gem install bundler -v 1.17.3 --no-document"
-
-RUN mkdir /var/local/jenkins
-
-# Define the default command.
-CMD ["bash"]

tools/run_tests/artifacts/distribtest_targets.py

@@ -340,14 +340,12 @@ def targets():
         RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_4'),
         RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_5'),
         RubyDistribTest('linux', 'x64', 'jessie', ruby_version='ruby_2_6'),
-        # TODO(apolcyn): unskip these after upgrading the ruby versions
+        RubyDistribTest('linux', 'x64', 'centos6'),
-        # of these dockerfiles to >= 2.3.
+        RubyDistribTest('linux', 'x64', 'centos7'),
-        #   RubyDistribTest('linux', 'x64', 'centos6'),
+        RubyDistribTest('linux', 'x64', 'fedora20'),
-        #   RubyDistribTest('linux', 'x64', 'centos7'),
+        RubyDistribTest('linux', 'x64', 'fedora21'),
-        #   RubyDistribTest('linux', 'x64', 'fedora20'),
+        RubyDistribTest('linux', 'x64', 'fedora22'),
-        #   RubyDistribTest('linux', 'x64', 'fedora21'),
+        RubyDistribTest('linux', 'x64', 'fedora23'),
-        #   RubyDistribTest('linux', 'x64', 'fedora22'),
-        #   RubyDistribTest('linux', 'x64', 'fedora23'),
         RubyDistribTest('linux', 'x64', 'opensuse'),
         RubyDistribTest('linux', 'x64', 'ubuntu1204'),
         RubyDistribTest('linux', 'x64', 'ubuntu1404'),