Add customize command support

lib/boxing/config.rb

@@ -13,7 +13,8 @@ class Config
                   :health_check, :health_check_path,
                   :assets_precompile, :node_version,
                   :build_packages, :runtime_packages,
-                  :revision, :sentry_release
+                  :revision, :sentry_release,
+                  :entrypoint, :command
 
     # @since 0.5.0
     def initialize(&block)

lib/boxing/context.rb

@@ -115,5 +115,31 @@ def mode_of(name)
       mode |= Package::RUNTIME if config.runtime_packages&.include?(name)
       mode
     end
+
+    # Return entrypoint options
+    #
+    # @return [Array<String>]
+    #
+    # @since 0.9.0
+    def entrypoint
+      return config.entrypoint.map(&:to_s) if config.entrypoint
+      return ['bin/openbox'] if has?('openbox')
+      return ['bin/rails'] if has?('rails')
+
+      %w[bundle exec]
+    end
+
+    # Return command options
+    #
+    # @return [Array<String>]
+    #
+    # @since 0.9.0
+    def command
+      return config.command.map(&:to_s) if config.command
+      return ['server'] if has?('openbox')
+      return ['server', '-b', '0.0.0.0'] if has?('rails')
+
+      ['rackup', '-o', '0.0.0.0']
+    end
   end
 end

spec/boxing/context_spec.rb

@@ -70,4 +70,64 @@
       it { is_expected.to be_truthy }
     end
   end
+
+  describe '#entrypoint' do
+    subject { context.entrypoint }
+
+    it { is_expected.to include('bundle', 'exec') }
+
+    context 'when customized entrypoint' do
+      before do
+        config.entrypoint = ['bin/rackup']
+      end
+
+      it { is_expected.to include('bin/rackup') }
+    end
+
+    context 'when openbox exists' do
+      let(:context) do
+        described_class.new(config, database, [instance_double('Bundler::Dependency', name: 'openbox', git: nil)])
+      end
+
+      it { is_expected.to include('bin/openbox') }
+    end
+
+    context 'when rails exists' do
+      let(:context) do
+        described_class.new(config, database, [instance_double('Bundler::Dependency', name: 'rails', git: nil)])
+      end
+
+      it { is_expected.to include('bin/rails') }
+    end
+  end
+
+  describe '#command' do
+    subject { context.command }
+
+    it { is_expected.to include('rackup', '-o', '0.0.0.0') }
+
+    context 'when customized command' do
+      before do
+        config.command = ['console']
+      end
+
+      it { is_expected.to include('console') }
+    end
+
+    context 'when openbox exists' do
+      let(:context) do
+        described_class.new(config, database, [instance_double('Bundler::Dependency', name: 'openbox', git: nil)])
+      end
+
+      it { is_expected.to include('server') }
+    end
+
+    context 'when rails exists' do
+      let(:context) do
+        described_class.new(config, database, [instance_double('Bundler::Dependency', name: 'rails', git: nil)])
+      end
+
+      it { is_expected.to include('server', '-b', '0.0.0.0') }
+    end
+  end
 end

templates/Dockerfile.tt

@@ -107,13 +107,5 @@ EXPOSE <%= config.port %>
 <%- if has?('liveness') || config.health_check -%>
 HEALTHCHECK CMD curl -f http://localhost:<%= config.port %><%= config.health_check_path %> || exit 1
 <%- end -%>
-<%- if has?('openbox') -%>
-ENTRYPOINT ["bin/openbox"]
-CMD ["server"]
-<%- elsif has?('rails') -%>
-ENTRYPOINT ["bin/rails"]
-CMD ["server", "-b", "0.0.0.0"]
-<%- else -%>
-ENTRYPOINT ["bundle", "exec"]
-CMD ["rackup", "-o", "0.0.0.0"]
-<%- end -%>
+ENTRYPOINT <%= entrypoint %>
+CMD <%= command %>