lib/generators/dockerfile_generator.rb in dockerfile-rails-1.5.14 vs lib/generators/dockerfile_generator.rb in dockerfile-rails-1.6.0

@@ -6,10 +6,11 @@
 
 class DockerfileGenerator < Rails::Generators::Base
   include DockerfileRails::Scanner
 
   BASE_DEFAULTS = {
+    "alpine" => false,
     "bin-cd" => false,
     "cache" => false,
     "ci" => false,
     "compose" => false,
     "fullstaq" => false,
@@ -37,11 +38,11 @@
     "sqlite3" => false,
     "sqlserver" => false,
     "sentry" => false,
     "sudo" => false,
     "swap" => nil,
-    "variant" => "slim",
+    "variant" => nil,
     "windows" => false,
     "yjit" => false,
   }.yield_self { |hash| Struct.new(*hash.keys.map(&:to_sym)).new(*hash.values) }
 
   OPTION_DEFAULTS = BASE_DEFAULTS.dup
@@ -50,10 +51,29 @@
   @@packages = { "base" => [], "build" => [], "deploy" => [] }
   @@vars = { "base" => {}, "build" => {}, "deploy" => {} }
   @@args = { "base" => {}, "build" => {}, "deploy" => {} }
   @@instructions = { "base" => nil, "build" => nil, "deploy" => nil }
 
+  ALPINE_MAPPINGS = {
+    "build-essential" => "build-base",
+    "chromium-sandbox" => "chromium-chromedriver",
+    "default-libmysqlclient-dev" => "mysql-client",
+    "default-mysqlclient" => "mysql-client",
+    "freedts-bin" => "freedts",
+    "libicu-dev" => "icu-dev",
+    "libjemalloc" => "jemalloc-dev",
+    "libjpeg-dev" => "jpeg-dev",
+    "libmagickwand-dev" => "imagemagick-libs",
+    "libsqlite3-0" => "sqlite-dev",
+    "libtiff-dev" => "tiff-dev",
+    "libvips" => "vips-dev",
+    "node-gyp" => "gyp",
+    "pkg-config" => "pkgconfig",
+    "python" => "python3",
+    "python-is-python3" => "python3"
+  }
+
   # load defaults from config file
   if File.exist? "config/dockerfile.yml"
     options = YAML.safe_load(IO.read("config/dockerfile.yml"), symbolize_names: true)[:options]
 
     if options
@@ -144,10 +164,13 @@
     desc: "image platform (example: linux/arm64)"
 
   class_option :registry, type: :string, default: OPTION_DEFAULTS.registry,
     desc: "docker registry to use (example: registry.docker.com/library/)"
 
+  class_option :alpine, type: :boolean, default: OPTION_DEFAULTS.alpine,
+    descr: "use alpine image"
+
   class_option :variant, type: :string, default: OPTION_DEFAULTS.variant,
     desc: "dockerhub image variant (example: slim-bullseye)"
 
   class_option :jemalloc, type: :boolean, default: OPTION_DEFAULTS.jemalloc,
     desc: "use jemalloc alternative malloc implementation"
@@ -372,10 +395,14 @@
     else
       ""
     end
   end
 
+  def variant
+    options.variant || (options.alpine ? "alpine" : "slim")
+  end
+
   def run_as_root?
     options.root?
   end
 
   def using_litefs?
@@ -514,10 +541,14 @@
     end
 
     gems.sort
   end
 
+  def alpinize(packages)
+    packages.map { |package| ALPINE_MAPPINGS[package] || package }.sort.uniq
+  end
+
   def base_packages
     packages = []
     packages += @@packages["base"] if @@packages["base"]
 
     if using_execjs?
@@ -542,11 +573,17 @@
     end
 
     # Passenger
     packages << "passenger" if using_passenger?
 
-    packages.sort.uniq
+    if options.alpine?
+      packages << "tzdata"
+
+      alpinize(packages)
+    else
+      packages.sort.uniq
+    end
   end
 
   def base_requirements
     requirements = []
     requirements << "nodejs" if using_execjs?
@@ -608,11 +645,15 @@
       else
         packages << "python"
       end
     end
 
-    packages.sort.uniq
+    if options.alpine?
+      alpinize(packages)
+    else
+      packages.sort.uniq
+    end
   end
 
   def deploy_packages
     packages = %w(curl) # work with the default healthcheck strategy in MRSK
     packages += @@packages["deploy"] if @@packages["deploy"]
@@ -657,13 +698,52 @@
 
     if !options.procfile.blank? || (procfile.size > 1)
       packages << "ruby-foreman"
     end
 
-    packages.sort
+    if options.alpine?
+      packages << "sqlite-libs" if @gemfile.include? "sqlite3"
+      packages << "libpq" if @gemfile.include? "pg"
+
+      alpinize(packages)
+    else
+      packages.sort.uniq
+    end
   end
 
+  def pkg_update
+    if options.alpine?
+      "apk update"
+    else
+      "apt-get update -qq"
+    end
+  end
+
+  def pkg_install
+    if options.alpine?
+      "apk add"
+    else
+      "apt-get install --no-install-recommends -y"
+    end
+  end
+
+  def pkg_cache
+    if options.alpine?
+      { "dev-apk-cache" => "/var/cache/apk" }
+    else
+      { "dev-apt-cache" => "/var/cache/apt", "dev-apt-lib" => "/var/lib/apt" }
+    end
+  end
+
+  def pkg_cleanup
+    if options.alpine?
+      "/var/cache/apk/*"
+    else
+      "/var/lib/apt/lists /var/cache/apt/archives"
+    end
+  end
+
   def base_repos
     repos = []
     packages = []
 
     if using_passenger?
@@ -678,12 +758,12 @@
     if repos.empty?
       ""
     else
       packages.sort!.uniq!
       unless packages.empty?
-        repos.unshift "apt-get update -qq &&",
-          "apt-get install --no-install-recommends -y #{packages.join(" ")} &&"
+        repos.unshift "#{pkg_update} &&",
+          "#{pkg_install} #{packages.join(" ")} &&"
       end
 
       repos.join(" \\\n    ") + " && \\\n    "
     end
   end
@@ -704,21 +784,22 @@
     if repos.empty?
       ""
     else
       packages.sort!.uniq!
       unless packages.empty?
-        repos.unshift "apt-get update -qq &&",
-          "apt-get install --no-install-recommends -y #{packages.join(" ")} &&"
+        repos.unshift "#{pkg_update} &&",
+          "#{pkg_install} --no-install-recommends -y #{packages.join(" ")} &&"
       end
 
       repos.join(" \\\n    ") + " && \\\n    "
     end
   end
 
   def base_env
     env = {
       "RAILS_ENV" => "production",
+      "BUNDLE_PATH" => "/usr/local/bundle",
       "BUNDLE_WITHOUT" => options.ci? ? "development" : "development:test"
     }
 
     if options.lock?
       env["BUNDLE_DEPLOYMENT"] = "1"
@@ -732,10 +813,10 @@
       env.merge! @@args["base"].to_h { |key, value| [key, "$#{key}"] }
     end
 
     env.merge! @@vars["base"] if @@vars["base"]
 
-    env.map { |key, value| "#{key}=#{value.inspect}" }
+    env.map { |key, value| "#{key}=#{value.inspect}" }.sort
   end
 
   def build_env
     env = {}