Ensure initial admin password is set on first run

This change applies only to the debian-based family.

After package install, grafana-server service is automatically started.
In result, default "admin" password is assigned to "admin" user.

Reference: http://docs.grafana.org/installation/configuration/#admin-password

To setup initial password it is required to write it in grafana.ini
before first service start. Currently, the only way to achieve this, is
to block service autostart (dpkg_autostart resource) and let Chef
handle everything - enable service and restart after grafana.ini is
changed.

This change should not be disruptive for any cookbook user.

.kitchen.dokken.yml

@@ -72,4 +72,4 @@ platforms:
 - name: opensuse-leap
   driver:
     image: dokken/opensuse-leap
-    pid_one_command: /bin/systemd
+    pid_one_command: /bin/systemd

.kitchen.yml

@@ -18,3 +18,7 @@ suites:
     run_list:
       - recipe[chef-grafana::default]
     attributes:
+      chef-grafana:
+        config:
+          security:
+            admin_password: "non-default"

metadata.rb

@@ -12,6 +12,7 @@
 end
 
 depends 'apt'
+depends 'dpkg_autostart'
 depends 'yum'
 
 source_url 'https://github.com/chef-cookbooks/chef-grafana'

recipes/install.rb

@@ -14,6 +14,10 @@
     components ['main']
     action :add
   end
+
+  dpkg_autostart 'grafana-server' do
+    allow false
+  end
 when 'rhel'
   yum_repository 'grafana' do
     description "Grafana - #{node['chef-grafana']['install']['channel']}"
@@ -32,5 +36,5 @@
 end
 
 service 'grafana-server' do
-  action [:enable, :start]
+  action :enable
 end

test/integration/default/serverspec/default_spec.rb

@@ -24,4 +24,9 @@
     it { should be_mode 644 }
     it { should contain '# Managed by Chef' }
   end
+
+  # check if non-default admin password is set
+  describe command('curl -I http://localhost:3000/api/datasources -H "Authorization: Basic YWRtaW46bm9uLWRlZmF1bHQ="') do
+    its(:stdout) { should match '200 OK' }
+  end
 end