Move CI image configuration entry to new CI config

lib/ci/gitlab_ci_yaml_processor.rb

@@ -14,7 +14,7 @@ module Ci
     ALLOWED_CACHE_KEYS = [:key, :untracked, :paths]
     ALLOWED_ARTIFACTS_KEYS = [:name, :untracked, :paths, :when, :expire_in]
 
-    attr_reader :after_script, :image, :services, :path, :cache
+    attr_reader :after_script, :services, :path, :cache
 
     def initialize(config, path = nil)
       @ci_config = Gitlab::Ci::Config.new(config)
@@ -22,8 +22,11 @@ module Ci
 
       @path = path
 
-      initial_parsing
+      unless @ci_config.valid?
+        raise ValidationError, @ci_config.errors.first
+      end
 
+      initial_parsing
       validate!
     rescue Gitlab::Ci::Config::Loader::FormatError => e
       raise ValidationError, e.message
@@ -60,6 +63,9 @@ module Ci
     private
 
     def initial_parsing
+      @before_script = @ci_config.before_script
+      @image = @ci_config.image
+
       @after_script = @config[:after_script]
       @image = @config[:image]
       @services = @config[:services]
@@ -87,7 +93,7 @@ module Ci
       {
         stage_idx: stages.index(job[:stage]),
         stage: job[:stage],
-        commands: [job[:before_script] || [@ci_config.before_script], job[:script]].flatten.compact.join("\n"),
+        commands: [job[:before_script] || [@before_script], job[:script]].flatten.compact.join("\n"),
         tag_list: job[:tags] || [],
         name: name,
         only: job[:only],
@@ -107,10 +113,6 @@ module Ci
     end
 
     def validate!
-      unless @ci_config.valid?
-        raise ValidationError, @ci_config.errors.first
-      end
-
       validate_global!
 
       @jobs.each do |name, job|
@@ -125,10 +127,6 @@ module Ci
         raise ValidationError, "after_script should be an array of strings"
       end
 
-      unless @image.nil? || @image.is_a?(String)
-        raise ValidationError, "image should be a string"
-      end
-
       unless @services.nil? || validate_array_of_strings(@services)
         raise ValidationError, "services should be an array of strings"
       end

lib/gitlab/ci/config.rb

@@ -7,7 +7,7 @@ module Gitlab
       ##
       # Temporary delegations that should be removed after refactoring
       #
-      delegate :before_script, to: :@global
+      delegate :before_script, :image, to: :@global
 
       def initialize(config)
         @config = Loader.new(config).load!

lib/gitlab/ci/config/node/global.rb

@@ -11,6 +11,9 @@ module Gitlab
 
           allow_node :before_script, Script,
             description: 'Script that will be executed before each job.'
+
+          allow_node :image, Image,
+            description: 'Docker image that will be used to execute jobs.'
         end
       end
     end

spec/lib/ci/gitlab_ci_yaml_processor_spec.rb

@@ -979,7 +979,7 @@ EOT
         config = YAML.dump({ image: ["test"], rspec: { script: "test" } })
         expect do
           GitlabCiYamlProcessor.new(config, path)
-        end.to raise_error(GitlabCiYamlProcessor::ValidationError, "image should be a string")
+        end.to raise_error(GitlabCiYamlProcessor::ValidationError, "Image config should be a string")
       end
 
       it "returns errors if job name is blank" do

spec/lib/gitlab/ci/config/node/global_spec.rb

@@ -21,7 +21,8 @@ describe Gitlab::Ci::Config::Node::Global do
 
   context 'when hash is valid' do
     let(:hash) do
-      { before_script: ['ls', 'pwd'] }
+      { before_script: ['ls', 'pwd'],
+        image: 'ruby:2.2' }
     end
 
     describe '#process!' do
@@ -32,17 +33,21 @@ describe Gitlab::Ci::Config::Node::Global do
       end
 
       it 'creates node object for each entry' do
-        expect(global.nodes.count).to eq 1
+        expect(global.nodes.count).to eq 2
       end
 
       it 'creates node object using valid class' do
         expect(global.nodes.first)
           .to be_an_instance_of Gitlab::Ci::Config::Node::Script
+        expect(global.nodes.second)
+          .to be_an_instance_of Gitlab::Ci::Config::Node::Image
       end
 
       it 'sets correct description for nodes' do
         expect(global.nodes.first.description)
           .to eq 'Script that will be executed before each job.'
+        expect(global.nodes.second.description)
+          .to eq 'Docker image that will be used to execute jobs.'
       end
     end
 
@@ -51,19 +56,26 @@ describe Gitlab::Ci::Config::Node::Global do
         expect(global).not_to be_leaf
       end
     end
-
+    context 'when not processed' do
       describe '#before_script' do
+        it 'returns nil' do
+          expect(global.before_script).to be nil
+        end
+      end
+    end
+
     context 'when processed' do
       before { global.process! }
 
+      describe '#before_script' do
         it 'returns correct script' do
           expect(global.before_script).to eq "ls\npwd"
         end
       end
 
-      context 'when not processed' do
-        it 'returns nil' do
-          expect(global.before_script).to be nil
+      describe '#image' do
+        it 'returns valid image' do
+          expect(global.image).to eq 'ruby:2.2'
         end
       end
     end