Add new mutex strategies

.devcontainer/Dockerfile

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+FROM ruby:latest
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.2.1

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+# Need to build using rbenv because these are very old ruby verions and their images need rebuilding to work anyways
+FROM debian:bullseye
+
+SHELL ["/bin/bash","-l","-c"]
+
+# Install dependencies
+RUN apt-get update
+RUN apt-get install ghostscript shared-mime-info openssl curl gnupg2 dirmngr git-core libcurl4-openssl-dev software-properties-common zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libffi-dev libpq-dev libmagickcore-6.q16-dev -y
+
+# Install rbenv & ruby-build
+RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv
+RUN echo 'export PATH="~/.rbenv/bin:$PATH"' >> ~/.bashrc
+RUN echo 'eval "$(rbenv init -)"' >> ~/.bashrc
+
+RUN git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
+RUN echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
+
+# Install ruby
+RUN rbenv rehash
+RUN rbenv install 2.1.10
+RUN rbenv global 2.1.10
+
+RUN gem install bundler -v '< 2'

.devcontainer/Dockerfile.2.2

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+# Need to build using rbenv because these are very old ruby verions and their images need rebuilding to work anyways
+FROM debian:bullseye
+
+SHELL ["/bin/bash","-l","-c"]
+
+# Install dependencies
+RUN apt-get update
+RUN apt-get install ghostscript shared-mime-info openssl curl gnupg2 dirmngr git-core libcurl4-openssl-dev software-properties-common zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libffi-dev libpq-dev libmagickcore-6.q16-dev -y
+
+# Install rbenv & ruby-build
+RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv
+RUN echo 'export PATH="~/.rbenv/bin:$PATH"' >> ~/.bashrc
+RUN echo 'eval "$(rbenv init -)"' >> ~/.bashrc
+
+RUN git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
+RUN echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
+
+# Install ruby
+RUN rbenv rehash
+RUN rbenv install 2.2.10
+RUN rbenv global 2.2.10
+
+RUN gem install bundler -v '< 2'

.devcontainer/Dockerfile.2.3.0

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+# Need to build using rbenv because these are very old ruby verions and their images need rebuilding to work anyways
+FROM debian:bullseye
+
+SHELL ["/bin/bash","-l","-c"]
+
+# Install dependencies
+RUN apt-get update
+RUN apt-get install ghostscript shared-mime-info openssl curl gnupg2 dirmngr git-core libcurl4-openssl-dev software-properties-common zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libffi-dev libpq-dev libmagickcore-6.q16-dev -y
+
+# Install rbenv & ruby-build
+RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv
+RUN echo 'export PATH="~/.rbenv/bin:$PATH"' >> ~/.bashrc
+RUN echo 'eval "$(rbenv init -)"' >> ~/.bashrc
+
+RUN git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
+RUN echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
+
+# Install ruby
+RUN rbenv rehash
+RUN rbenv install 2.3.0
+RUN rbenv global 2.3.0
+
+RUN gem install bundler -v '< 2'

.devcontainer/Dockerfile.2.7.0

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+FROM ruby:2.7.0
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.3.0

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+FROM ruby:3.0
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.3.1

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+FROM ruby:3.1
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.3.2

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+FROM ruby:3.2
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.3.3

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+FROM ruby:3.3
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/Dockerfile.3.4

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+FROM ruby:3.4
+
+RUN apt-get update && apt-get install -y bash git vim && rm -rf /var/lib/apt/lists/*
+
+RUN gem install bundler

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/docker-existing-docker-compose
+// If you want to run as a non-root user in the container, see .devcontainer/docker-compose.yml.
+{
+	"name": "Redis Mutex",
+
+	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
+	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
+	"dockerComposeFile": "./docker-compose.yml",
+
+	// The 'service' property is the name of the service for the container that VS Code should
+	// use. Update this value and .devcontainer/docker-compose.yml to the real service name.
+	"service": "app",
+
+	// The optional 'workspaceFolder' property is the path VS Code should open by default when
+	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
+  "workspaceFolder": "/app",
+  "shutdownAction": "stopCompose",
+
+  "mounts": [
+	  "source=${localEnv:HOME}/.ssh,target=/root/.ssh,type=bind,consistency=cached"
+  ],
+
+  "postAttachCommand": "git config --global --add safe.directory /app",
+}

.devcontainer/docker-compose.yml

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+version: '3'
+name: redis-mutex
+networks:
+  redis-mutex:
+    name: redis-mutex
+    external: false
+volumes:
+  redis_data:
+    name: 'redis-mutex-redis-data'
+  redis_shared_data:
+    name: 'redis-mutex-redis-data'
+services:
+  redis:
+    image: redis:7-alpine
+    command: redis-server
+    container_name: redis-mutex-redis
+    volumes:
+      - 'redis_shared_data:/var/shared/redis:delegated'
+      - 'redis_data:/data:delegated'
+    networks:
+      - redis-mutex
+    expose:
+      - 6379
+    healthcheck:
+      test: ["CMD-SHELL", "redis-cli ping | grep PONG"]
+      interval: 10s
+      timeout: 5s
+      retries: 2
+      start_period: 10s
+    restart: unless-stopped
+  app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile.2.1
+    image: redis-mutex
+    container_name: redis-mutex
+    pull_policy: build
+    volumes:
+      - '..:/app:cached'
+    networks:
+      - redis-mutex
+    stdin_open: true
+    tty: true
+    environment:
+      BUNDLE_PATH: /app/vendor/bundle
+      REDIS_URL: redis://redis:6379/1
+      CI: true
+    entrypoint: ['/bin/bash', '-l', '-c']
+    command: '"tail -f /dev/null"'
+    depends_on:
+      redis:
+        condition: service_healthy

.github/workflows/rspec.yml

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+name: RSpec
+
+on:
+  pull_request:
+
+env:
+  CI: true
+  REDIS_URL: redis://localhost:6379/1
+
+concurrency:
+  group: ${{ github.event.repository.name }}-${{ github.workflow }}-${{ github.head_ref || github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  rspec:
+    name: RSpec
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: [2.1, 2.2, 2.3.0, 2.7.0, 3.0, 3.1, 3.2, 3.3, 3.4]
+
+    services:
+      redis:
+        image: public.ecr.aws/docker/library/redis:7-alpine
+        ports:
+          - "6379:6379"
+        options: >-
+          --health-cmd "redis-cli ping"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+
+      - name: Run rspec
+        run: bundle exec rspec

.gitignore

@@ -1,3 +1,4 @@
 pkg
 Gemfile.lock
+vendor
 spec/examples.txt

Rakefile

@@ -1,14 +1,2 @@
 #!/usr/bin/env rake
 require "bundler/gem_tasks"
-
-# RSpec
-require 'rspec/core/rake_task'
-RSpec::Core::RakeTask.new('spec')
-task :default => :spec
-
-# Custom Tasks
-desc 'Flush the test database'
-task :flushdb do
-  require 'redis'
-  Redis.new(:db => 15).flushdb
-end