Add GitHub Actions.

.github/workflows/test.yml

@@ -0,0 +1,56 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  build:
+    name: >-
+      ${{ matrix.os }} ruby ${{ matrix.ruby }} ${{ matrix.db }}
+    # Run all the tests on the new environment as much as possible.
+    # https://docs.github.com/en/free-pro-team@latest/actions/reference/specifications-for-github-hosted-runners
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.allow-failure }}
+    strategy:
+      matrix:
+        os:
+          # Comment out ubuntu-20.04 temporarily, as the oldest mysql is 8.0 on it, there is an issue.
+          # https://github.com/brianmario/mysql2/issues/1165
+          # - ubuntu-20.04 # focal
+          - ubuntu-18.04 # bionic
+          # - ubuntu-16.04 # xenial
+        ruby:
+          - '3.0'
+          - 2.7
+          - 2.6
+          - 2.5
+          - 2.4
+          - 2.3
+          - 2.2
+          - 2.1
+        db: ['']
+        allow-failure: [false]
+        include:
+          # Allow failure due to Mysql2::Error: Unknown system variable 'session_track_system_variables'.
+          - {os: ubuntu-16.04, ruby: 2.4, db: mariadb10.0, allow-failure: true}
+          # Comment out due to .travis_setup.sh freezing.
+          # - {os: ubuntu-18.04, ruby: 2.4, db: mariadb10.1, allow-failure: false}
+          # Allow failure due to the issue #1165.
+          - {os: ubuntu-20.04, ruby: 2.4, db: mariadb10.3, allow-failure: true}
+          - {os: ubuntu-18.04, ruby: 2.4, db: mysql57, allow-failure: false}
+          # Allow failure due to the issue #1165.
+          - {os: ubuntu-20.04, ruby: 2.4, db: mysql80, allow-failure: true}
+          - {os: ubuntu-18.04, ruby: 'head', db: '', allow-failure: true}
+      # On the fail-fast: true, it cancels all in-progress jobs
+      # if any matrix job fails unlike Travis fast_finish.
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v2
+      # https://github.com/ruby/setup-ruby
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - run: ruby -v
+      - run: bundle install --without benchmarks development
+      - if: matrix.db != ''
+        run: echo 'DB=${{ matrix.db }}' >> $GITHUB_ENV
+      - run: sudo echo "127.0.0.1 mysql2gem.example.com" | sudo tee -a /etc/hosts
+      - run: bash .travis_setup.sh
+      - run: bundle exec rake

.travis_mysql57.sh

@@ -6,9 +6,8 @@ apt-get purge -qq '^mysql*' '^libmysql*'
 rm -fr /etc/mysql
 rm -fr /var/lib/mysql
 apt-key add support/5072E1F5.asc
+# Verify the repository as add-apt-repository does not.
+wget -q --spider http://repo.mysql.com/apt/ubuntu/dists/$(lsb_release -cs)/mysql-5.7
 add-apt-repository 'http://repo.mysql.com/apt/ubuntu mysql-5.7'
 apt-get update -qq
 apt-get install -qq mysql-server libmysqlclient-dev
-
-# https://www.percona.com/blog/2016/03/16/change-user-password-in-mysql-5-7-with-plugin-auth_socket/
-mysql -u root -e "ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY ''"

.travis_mysql80.sh

@@ -6,9 +6,8 @@ apt-get purge -qq '^mysql*' '^libmysql*'
 rm -fr /etc/mysql
 rm -fr /var/lib/mysql
 apt-key add support/5072E1F5.asc
+# Verify the repository as add-apt-repository does not.
+wget -q --spider http://repo.mysql.com/apt/ubuntu/dists/$(lsb_release -cs)/mysql-8.0
 add-apt-repository 'http://repo.mysql.com/apt/ubuntu mysql-8.0'
 apt-get update -qq
 apt-get install -qq mysql-server libmysqlclient-dev
-
-# https://www.percona.com/blog/2016/03/16/change-user-password-in-mysql-5-7-with-plugin-auth_socket/
-mysql -u root -e "ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY ''"

.travis_setup.sh

@@ -2,6 +2,13 @@
 
 set -eux
 
+# Install the default used DB if DB is not set.
+if [[ -z ${DB-} ]]; then
+  sudo apt-get update -qq
+  sudo apt-get install -qq mysql-server-5.7 mysql-client-core-5.7 mysql-client-5.7
+  # sudo service mysql restart
+fi
+
 # Install MySQL 5.5 if DB=mysql55
 if [[ -n ${DB-} && x$DB =~ ^xmysql55 ]]; then
   sudo bash .travis_mysql55.sh
@@ -19,12 +26,12 @@ fi
 
 # Install MariaDB client headers after Travis CI fix for MariaDB 10.2 broke earlier 10.x
 if [[ -n ${DB-} && x$DB =~ ^xmariadb10.0 ]]; then
-  sudo apt-get install -y -o Dpkg::Options::='--force-confnew' libmariadbclient-dev
+  sudo apt-get install -y -o Dpkg::Options::='--force-confnew' mariadb-server mariadb-server-10.0 libmariadb2
 fi
 
 # Install MariaDB client headers after Travis CI fix for MariaDB 10.2 broke earlier 10.x
 if [[ -n ${DB-} && x$DB =~ ^xmariadb10.1 ]]; then
-  sudo apt-get install -y -o Dpkg::Options::='--force-confnew' libmariadbclient-dev
+  sudo apt-get install -y -o Dpkg::Options::='--force-confnew' mariadb-server mariadb-server-10.1 libmariadbclient18
 fi
 
 # Install MariaDB 10.2 if DB=mariadb10.2
@@ -52,6 +59,33 @@ if [[ x$OSTYPE =~ ^xdarwin ]]; then
   $(brew --prefix "$DB")/bin/mysql -u root -e 'CREATE DATABASE IF NOT EXISTS test'
 else
   mysqld --version
+
+  if [ -f /etc/mysql/debian.cnf ]; then
+    MYSQL_OPTS='--defaults-extra-file=/etc/mysql/debian.cnf'
+    # Install from packages in OS official packages.
+    # Create a testing root user as the default root user does not allow the empty password.
+    # https://www.percona.com/blog/2016/03/16/change-user-password-in-mysql-5-7-with-plugin-auth_socket/
+    sudo cat /etc/mysql/debian.cnf
+    if sudo grep -q debian-sys-maint /etc/mysql/debian.cnf; then
+      # bionic, focal
+      DB_SYS_USER=debian-sys-maint
+    else
+      # xenial
+      DB_SYS_USER=root
+    fi
+  else
+    # Install from official mysql packages.
+    MYSQL_OPTS=''
+    DB_SYS_USER=root
+  fi
+
+  sudo mysql ${MYSQL_OPTS} -u "${DB_SYS_USER}" <<SQL
+CREATE USER 'root-test'@'localhost' IDENTIFIED BY '';
+GRANT ALL PRIVILEGES ON *.* TO 'root-test'@'localhost' WITH GRANT OPTION;
+FLUSH PRIVILEGES;
+SQL
+  mysql -u root-test -e 'select Host, User, plugin from mysql.user;'
+
   # IF NOT EXISTS is mariadb-10+ only - https://mariadb.com/kb/en/mariadb/comment-syntax/
-  mysql -u root -e 'CREATE DATABASE /*M!50701 IF NOT EXISTS */ test'
+  mysql -u root-test -e 'CREATE DATABASE /*M!50701 IF NOT EXISTS */ test'
 fi

Gemfile

@@ -33,8 +33,10 @@ group :development do
   gem 'rake-compiler-dock', '~> 0.7.0'
 end
 
-platforms :rbx do
-  gem 'rubysl-bigdecimal'
-  gem 'rubysl-drb'
-  gem 'rubysl-rake'
-end
+# On MRI Ruby >= 3.0, rubysl-rake causes the conflict on GitHub Actions.
+# rubysl-rake was resolved to 1.0.1, which depends on Ruby
+# platforms :rbx do
+#   gem 'rubysl-bigdecimal'
+#   gem 'rubysl-drb'
+#   gem 'rubysl-rake'
+# end

spec/configuration.yml.example

@@ -1,6 +1,6 @@
 root:
   host: localhost
-  username: root
+  username: root-test
   password:
   database: test