adding documentation and tests for setting dpkg options unattended upgrades

Signed-off-by: Ben Abrams <me@benabrams.it>

Author: majormoses

README.md

@@ -83,7 +83,7 @@ For example, to prevent caching and directly connect to the repository at `downl
             "cacher_server": {
                 "cache_bypass": {
                     "download.oracle.com": "http",
-                    "nginx.org": "https"  
+                    "nginx.org": "https"
                 }
             }
         }
@@ -137,6 +137,7 @@ To pull just security updates, set `origins_patterns` to something like `["origi
 - `['apt']['unattended_upgrades']['random_sleep']` - Wait a random number of seconds up to this value before running daily periodic apt actions. System default is 1800 seconds (30 minutes).
 - `['apt']['unattended_upgrades']['syslog_enable']` - Enable logging to syslog. Defaults to false.
 - `['apt']['unattended_upgrades']['syslog_facility']` - Specify syslog facility. Defaults to 'daemon'.
+- `['apt']['unattended_upgrades']['dpkg_options']` An array of dpkg options to be used specifically only for unattended upgrades. Defaults to `[]` which will prevent it from being rendered from the template in the resulting file.
 
 ### Configuration for APT
 

kitchen.yml

@@ -41,7 +41,15 @@ suites:
   - name: resources
     run_list:
       - recipe[test::resources]
+      # test that you can specifically modify some unattended upgrades options but leave the majority in place
+      - recipe[test::unattended-upgrades]
     excludes: centos-7
+    attributes:
+      apt:
+        unattended_upgrades:
+          dpkg_options:
+            - --force-confdef
+            - --force-confold
 
   - name: unattended-upgrades
     run_list:

test/integration/resources/unattended_upgrades_spec.rb

@@ -0,0 +1,10 @@
+if os.name == 'debian' || os.name == 'ubuntu'
+
+  describe file('/etc/apt/apt.conf.d/50unattended-upgrades') do
+    it { should be_file }
+    it { should be_owned_by 'root' }
+    it { should be_grouped_into 'root' }
+    it { should be_mode 0644 }
+    its(:content) { should match(/"--force-confold";/) }
+  end
+end