Allow to configure nexus's system user uid & gid

It's better to give the ability to users to be very explicit on their
desired configuration.
Especially on such property, which ease consistency of files ownership
accross multiple installs.

attributes/default.rb

@@ -13,6 +13,8 @@
 default['nexus3']['data'] = "#{node['nexus3']['path']}/sonatype-work/nexus3"
 # Nexus username (do not run as root)
 default['nexus3']['user'] = 'nexus'
+default['nexus3']['uid'] = nil
+default['nexus3']['gid'] = nil
 
 default['nexus3']['properties_variables']['application-port'] = '8081'
 default['nexus3']['properties_variables']['application-host'] = '0.0.0.0'

resources/default.rb

@@ -1,6 +1,8 @@
 property :instance_name, String, name_property: true
 property :nexus3_user, [String, NilClass], default: lazy { node['nexus3']['user'] }
+property :nexus3_uid, [String, Integer, NilClass], default: lazy { node['nexus3']['uid'] }
 property :nexus3_group, [String, NilClass], default: lazy { node['nexus3']['group'] }
+property :nexus3_gid, [String, Integer, NilClass], default: lazy { node['nexus3']['gid'] }
 property :nexus3_password, String, sensitive: true, default: lazy { node['nexus3']['api']['password'] } # Admin password
 property :version, String, default: lazy { node['nexus3']['version'] }
 property :url, [String, NilClass], default: lazy { node['nexus3']['url'] }
@@ -18,16 +20,17 @@
 action :install do
   install_dir = ::File.join(new_resource.path, "nexus-#{new_resource.version}")
 
+  group new_resource.nexus3_group do
+    gid new_resource.nexus3_gid unless new_resource.nexus3_gid.nil?
+  end
+
   user new_resource.nexus3_user do
     comment 'Nexus 3 user'
+    group new_resource.nexus3_group
     home new_resource.nexus3_home
     manage_home false # is linked to install_dir below
     shell '/bin/bash'
-  end
-
-  group new_resource.nexus3_group do
-    members new_resource.nexus3_user
-    append true
+    uid new_resource.nexus3_uid unless new_resource.nexus3_uid.nil?
   end
 
   # Install Nexus3 software

test/fixtures/cookbooks/nexus3_test/recipes/default.rb

@@ -14,6 +14,8 @@
     data '/usr/local/nexusbar/data'
     nexus3_user 'nexusbar'
     nexus3_group 'nexusbar'
+    nexus3_uid 1234
+    nexus3_gid 5678
     nexus3_home '/home/nexusbar'
     nexus3_password 'humdiddle'
     properties_variables(node['nexus3']['properties_variables'].merge('application-port': '8082'))

test/integration/default/inspec/default_spec.rb

@@ -60,6 +60,13 @@
     its('content') { should match(%r{nexus-context-path=/}) }
   end
 
+  describe user('nexusbar') do
+    it { should exist }
+    its('uid') { should eq 1234 }
+    its('group') { should eq 'nexusbar' }
+    its('gid') { should eq 5678 }
+  end
+
   describe file('/usr/local/nexusbar/data/etc') do
     it { should be_directory }
     it { should be_owned_by 'nexusbar' }