Fix systemd detection for Ubuntu 18.04 support

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.4.3 / 2018.12.11
+* [ENHANCEMENT] Use systemd if installed. There's no /sbin/init in Ubuntu 18.04.
+* [TESTS] Added spec tests for Ubuntu 18.04
+
 # 0.4.2 / 2018.12.11
 * [ENHANCEMENT] added option to set the tmpdir path for source files
 

fpm-fry.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |gem|
   gem.name    = 'fpm-fry'
-  gem.version = '0.4.2'
+  gem.version = '0.4.3'
   gem.date    = Time.now.strftime("%Y-%m-%d")
 
   gem.summary = "FPM Fry"

lib/fpm/fry/plugin/init.rb

@@ -40,7 +40,7 @@ def init
 
 private
   def self.detect(inspector)
-    if inspector.link_target('/sbin/init') == '/lib/systemd/systemd'
+    if inspector.exists?('/lib/systemd/systemd')
       return System.new(:systemd, {})
     end
     if inspector.exists?('/etc/init')

spec/detector_spec.rb

@@ -91,6 +91,34 @@
 
   end
 
+  context 'with ubuntu:18.04' do
+
+    let(:result) do
+      result = nil
+      with_inspector('ubuntu:18.04') do |inspector|
+        result = Detector.detect(inspector)
+      end
+      result
+    end
+
+    it 'finds ubuntu' do
+      expect(result[:distribution]).to eq('ubuntu')
+    end
+
+    it 'finds release 18.04' do
+      expect(result[:release]).to eq('18.04')
+    end
+
+    it 'finds codename bionic' do
+      expect(result[:codename]).to eq('bionic')
+    end
+
+    it 'finds flavour debian' do
+      expect(result[:flavour]).to eq('debian')
+    end
+
+  end
+
   context 'with ubuntu:16.04' do
 
     let(:result) do

spec/plugin/init_spec.rb

@@ -32,10 +32,18 @@
       builder.plugin('init')
       expect(builder.init).to be_a FPM::Fry::Plugin::Init::System
     end
-
   end
 
   context 'init detection (real)' do
+    context 'with ubuntu:18.04' do
+      skip 'finds systemd' do
+        with_inspector('ubuntu:18.04') do |insp|
+          builder = FPM::Fry::Recipe::Builder.new({},inspector: insp)
+          builder.extend(FPM::Fry::Plugin::Init)
+          expect(builder.init).to be_systemd
+        end
+      end
+    end
 
     context 'with ubuntu:16.04' do
       it 'finds systemd' do