Load modules config only for modules managed by puppet (#90)

lib/facter/kmod.rb

@@ -1,51 +1,73 @@
 # frozen_string_literal: true
 
-# @summary Return a hash of loaded kernel modules
+# @summary Return a hash of loaded kernel modules explicitly declared by puppet
+#  e.g. using kmod::load { 'overlay': }
+
+def kmod_load_module_config(kmodule)
+  if File.exist?('/sys/module')
+    config = {
+      'parameters' => {},
+      'used_by' => [],
+    }
+
+    if File.directory?("/sys/module/#{kmodule}/parameters")
+      Dir.foreach("/sys/module/#{kmodule}/parameters") do |param|
+        next if ['.', '..'].include?(param)
+
+        next unless File.readable?("/sys/module/#{kmodule}/parameters/#{param}")
+
+        begin
+          config['parameters'][param] = File.read("/sys/module/#{kmodule}/parameters/#{param}").chomp.delete("\u0000")
+        rescue StandardError
+          # some kernel parameters are write only
+          # even though they have the read bit set
+          # so just ignore read errors
+          nil
+        end
+      end
+    end
+
+    if File.directory?("/sys/module/#{kmodule}/holders")
+      Dir.foreach("/sys/module/#{kmodule}/holders") do |used|
+        next if ['.', '..'].include?(used)
+
+        config['used_by'] << used
+      end
+    end
+
+    config
+  else
+    Facter.debug('/sys/module is not found. skipping.')
+  end
+end
 
 Facter.add(:kmods) do
   confine kernel: :linux
 
   kmod = {}
 
   setcode do
-    if File.exist?('/sys/module')
-      Dir.foreach('/sys/module') do |directory|
-        next if ['.', '..'].include?(directory)
-
-        kmod[directory] = {
-          'parameters' => {},
-          'used_by' => [],
-        }
-
-        if File.directory?("/sys/module/#{directory}/parameters")
-          Dir.foreach("/sys/module/#{directory}/parameters") do |param|
-            next if ['.', '..'].include?(param)
-
-            next unless File.readable?("/sys/module/#{directory}/parameters/#{param}")
-
-            begin
-              kmod[directory]['parameters'][param] = File.read("/sys/module/#{directory}/parameters/#{param}").chomp.delete("\u0000")
-            rescue StandardError
-              # some kernel parameters are write only
-              # even though they have the read bit set
-              # so just ignore read errors
-              nil
-            end
-          end
-        end
-
-        if File.directory?("/sys/module/#{directory}/holders")
-          Dir.foreach("/sys/module/#{directory}/holders") do |used|
-            next if ['.', '..'].include?(used)
+    if File.directory?('/etc/modules-load.d')
+      # Debian
+      Dir.foreach('/etc/modules-load.d') do |item|
+        next if ['.', '..', 'modules.conf'].include?(item)
 
-            kmod[directory]['used_by'] << used
-          end
+        if item.end_with? '.conf'
+          mod = File.basename(item, '.conf')
+          kmod[mod] = kmod_load_module_config(mod)
         end
       end
+    elsif File.directory?('/etc/sysconfig/modules')
+      # RedHat
+      Dir.foreach('/etc/sysconfig/modules') do |item|
+        next if ['.', '..'].include?(item)
 
-      kmod
-    else
-      Facter.debug('/sys/module is not found. skipping.')
+        if item.end_with? '.modules'
+          mod = File.basename(item, '.modules')
+          kmod[mod] = kmod_load_module_config(mod)
+        end
+      end
     end
+    kmod
   end
 end