support plugins installation

FAR: Install a plugin in tests, the one we have on hand for
     chef has some issues preventing us to create maven components.
     Until we've got a better/fixed plugin let's skip the install
     in tests.

README.md

@@ -87,6 +87,7 @@ Downloads and installs the latest Nexus 3 Repository Manager OSS.
   documentation on newer releases.
 - `node['nexus3']['outbound_proxy']` - Configure outbound HTTP/HTTPS proxy. See example
   'Configure outbound HTTP/HTTPS proxy for all the attributes.'
+- `node['nexus3']['plugins']` - Install external plugins, takes a hash of `{ 'plugin-name' : { "name": "name override", "source": "..", "checksum": "..", "action": "remote file action"}}`. Plugins should be bundled in KAR format, and will be written on disk as `<plugin-name>-bundle.kar`
 
 ### Examples
 

attributes/default.rb

@@ -50,3 +50,15 @@
 default['nexus3']['vmoptions_variables']['Dkaraf.startLocalConsole'] = false
 default['nexus3']['vmoptions_variables']['Djava.net.preferIPv4Stack'] = true
 default['nexus3']['vmoptions_variables']['Djava.endorsed.dirs'] = 'lib/endorsed'
+
+# Plugins bundles in KAR format to install
+#
+#  default['nexus3']['plugins']['nexus-repository-chef'] = {
+#    "name": "force_another_name",
+#    "source": "https://on.the.internet/nexus-repository-chef-0.0.10-bundle.kar",
+#    "checksum": "8e6494bd8edbf3beb6b7054d599561e698dcf3f666c2114b7126c246804484a9",
+#    "action": "create" # https://docs.chef.io/resources/remote_file/#actions
+#  }
+#
+# https://help.sonatype.com/en/installing-bundles.html
+default['nexus3']['plugins'] = {}

resources/default.rb

@@ -16,6 +16,7 @@
 property :properties_variables, Hash, default: lazy { node['nexus3']['properties_variables'] }
 property :vmoptions_variables, Hash, default: lazy { node['nexus3']['vmoptions_variables'] }
 property :outbound_proxy, [Hash, NilClass], sensitive: true, default: lazy { node['nexus3']['outbound_proxy'] }
+property :plugins, Hash, default: lazy { node['nexus3']['plugins'] }
 
 action :install do
   install_dir = ::File.join(new_resource.path, "nexus-#{new_resource.version}")
@@ -96,6 +97,19 @@
     notifies :run, "ruby_block[#{blocker}]", :delayed
   end
 
+  # Install plugins
+  new_resource.plugins.each do |name, config|
+    plugin_file_path = ::File.join(install_dir, 'deploy', "#{config['name'] || name}-bundle.kar")
+    remote_file plugin_file_path do
+      source config['source']
+      checksum config['checksum']
+      owner new_resource.nexus3_user
+      action((config['action'] || :create).to_sym)
+      notifies :restart, "nexus3_service[#{new_resource.service_name}]", :delayed
+      notifies :run, "ruby_block[#{blocker}]", :delayed
+    end
+  end
+
   link new_resource.nexus3_home do
     to install_dir
     owner new_resource.nexus3_user