Merge branch 'jej-lint-scripts-and-config' into 'master'

Syntax linting for init scripts

Closes #27787

See merge request !9054

.gitlab-ci.yml

@@ -243,6 +243,7 @@ rubocop:
 
 rake haml_lint: *exec
 rake scss_lint: *exec
+rake config_lint: *exec
 rake brakeman: *exec
 rake flay: *exec
 license_finder: *exec

lib/tasks/config_lint.rake

+module ConfigLint
+  def self.run(files)
+    failures = files.reject do |file|
+      yield(file)
+    end
+
+    if failures.present?
+      puts failures
+      exit failures.count
+    end
+  end
+end
+
+desc "Checks syntax for shell scripts and nginx config files in 'lib/support/'"
+task :config_lint do
+  shell_scripts = [
+    'lib/support/init.d/gitlab',
+    'lib/support/init.d/gitlab.default.example',
+    'lib/support/deploy/deploy.sh'
+  ]
+
+  ConfigLint.run(shell_scripts) do |file|
+    Kernel.system('bash', '-n', file)
+  end
+end

spec/tasks/config_lint_spec.rb

+require 'rake_helper'
+Rake.application.rake_require 'tasks/config_lint'
+
+describe ConfigLint do
+  let(:files){ ['lib/support/fake.sh'] }
+
+  it 'errors out if any bash scripts have errors' do
+    expect { ConfigLint.run(files){ system('exit 1') } }.to raise_error(SystemExit)
+  end
+
+  it 'passes if all scripts are fine' do
+    expect { ConfigLint.run(files){ system('exit 0') } }.not_to raise_error
+  end
+end
+
+describe 'config_lint rake task' do
+  before(:each) do
+    # Prevent `system` from actually being called
+    allow(Kernel).to receive(:system).and_return(true)
+  end
+
+  it 'runs lint on shell scripts' do
+    expect(Kernel).to receive(:system).with('bash', '-n', 'lib/support/init.d/gitlab')
+
+    run_rake_task('config_lint')
+  end
+end