Add test for upgrading from previous version of oss to current

.kitchen.yml

@@ -41,7 +41,6 @@ platforms:
       use_sudo: false
       volume: 
         - <%=ENV['ES_XPACK_LICENSE_FILE']%>:/tmp/license.json
-        - /etc/elasticsearch
   - name: ubuntu-16.04
     driver_config:
       image: dliappis/ubuntu-devopsci:16.04
@@ -55,7 +54,6 @@ platforms:
       use_sudo: false
       volume: 
         - <%=ENV['ES_XPACK_LICENSE_FILE']%>:/tmp/license.json
-        - /etc/elasticsearch
       run_command: "/sbin/init"
   - name: debian-8
     driver_config:
@@ -71,7 +69,6 @@ platforms:
         - pip uninstall -y ansible
       volume: 
         - <%=ENV['ES_XPACK_LICENSE_FILE']%>:/tmp/license.json
-        - /etc/elasticsearch
       use_sudo: false
       run_command: "/sbin/init"
   - name: centos-7
@@ -88,7 +85,6 @@ platforms:
         - pip install jmespath
       volume: 
         - <%=ENV['ES_XPACK_LICENSE_FILE']%>:/tmp/license.json
-        - /etc/elasticsearch
       run_command: "/usr/sbin/init"
       privileged: true
       use_sudo: false
@@ -133,3 +129,9 @@ suites:
     provisioner:
       playbook: test/integration/issue-test.yml
       idempotency_test: false
+  - name: oss-upgrade
+    run_list:
+    attributes:
+    provisioner:
+      playbook: test/integration/oss-upgrade.yml
+      idempotency_test: false

tasks/elasticsearch-config.yml

@@ -86,9 +86,29 @@
     content: ''
   when: ansible_os_family == 'RedHat'
 
-- name: Delete Default Sysconfig File
+- name: Check if default systemd file exists
+  stat:
+    path: "{{ sysd_script }}"
+  register: sysd_stat_result
+
+- name: Remove if it is a normal file
+  file:
+    path: "{{ sysd_script }}"
+    state: absent
+  when: not sysd_stat_result.stat.islnk
+
+- name: Create a symbolic link to the default systemd location to the first instance running on this host
   become: yes
-  file: dest="{{ sysd_script }}" state=absent
+  file:
+    state: link
+    src: "{{ instance_sysd_script }}"
+    path: "{{ sysd_script }}"
+  when:
+  - use_system_d
+  - not sysd_stat_result.stat.islnk
+  notify:
+  - reload systemd configuration
+  - restart elasticsearch
 
 - name: Delete Default Configuration File
   become: yes

test/integration/helpers/serverspec/oss_upgrade_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+shared_examples 'oss_upgrade::init' do |vars|
+  describe 'version check' do
+    it 'should be reported as version '+vars['es_version'] do
+      expect(curl_json('http://localhost:9200')['version']['number']).to eq(vars['es_version'])
+    end
+  end
+end

test/integration/oss-upgrade.yml

@@ -0,0 +1,21 @@
+---
+- name: Standard test for single node setup. Tests idempotence.
+  hosts: localhost
+  tasks:
+    - include: elasticsearch/test/integration/debug.yml
+  roles:
+    - { role: elasticsearch, es_instance_name: "node1" }
+  vars:
+    es_version: "{{ '6.2.4' if es_major_version == '6.x' else '5.6.9' }}" # This is set to an older version than the current default to force an upgrade
+    es_enable_xpack: false
+    es_heap_size: "1g"
+
+- name: Standard test for single node setup. Tests idempotence.
+  hosts: localhost
+  tasks:
+    - include: elasticsearch/test/integration/debug.yml
+  roles:
+    - { role: elasticsearch, es_instance_name: "node1" }
+  vars:
+    es_enable_xpack: false
+    es_heap_size: "1g"

test/integration/oss-upgrade/oss-upgrade.yml

@@ -0,0 +1,2 @@
+---
+- host: test-kitchen

test/integration/oss-upgrade/serverspec/default_spec.rb

@@ -0,0 +1,7 @@
+require 'oss_upgrade_spec'
+require 'json'
+vars = JSON.parse(File.read('/tmp/vars.json'))
+
+describe 'oss upgrade Tests' do
+  include_examples 'oss_upgrade::init', vars
+end

test/matrix.yml

@@ -14,3 +14,4 @@ TEST_TYPE:
   - xpack
   - xpack-standard
   - issue-test
+  - oss-upgrade