Drop stderr from mkconfig output when updating grub

lib/puppet/provider/grub_config/grub2.rb

@@ -20,7 +20,12 @@ def self.mkconfig_path
   end
 
   confine feature: :augeas
-  commands mkconfig: mkconfig_path
+
+  confine exists: mkconfig_path, for_binary: true
+
+  def mkconfig
+    execute(self.class.mkconfig_path, { failonfail: true, combine: false })
+  end
 
   defaultfor osfamily: :RedHat
 

lib/puppet/provider/grub_menuentry/grub2.rb

@@ -250,7 +250,12 @@ def self.prefetch(resources)
 
   #### End Class Methods
 
-  commands mkconfig: mkconfig_path
+  confine exists: mkconfig_path, for_binary: true
+
+  def mkconfig
+    execute(self.class.mkconfig_path, { failonfail: true, combine: false })
+  end
+
   commands grubby: 'grubby'
   commands grub_set_default: 'grub2-set-default'
 

lib/puppet/provider/grub_user/grub2.rb

@@ -14,7 +14,11 @@ def self.mkconfig_path
     which('grub2-mkconfig') or which('grub-mkconfig') or '/usr/sbin/grub-mkconfig'
   end
 
-  commands mkconfig: mkconfig_path
+  confine exists: mkconfig_path, for_binary: true
+
+  def mkconfig
+    execute(self.class.mkconfig_path, { failonfail: true, combine: false })
+  end
 
   confine exists: '/etc/grub.d'
 

lib/puppet/provider/kernel_parameter/grub2.rb

@@ -28,7 +28,12 @@ def self.mkconfig_path
 
   confine feature: :augeas
   defaultfor augeasprovider_grub_version: 2
-  commands mkconfig: mkconfig_path
+
+  confine exists: mkconfig_path, for_binary: true
+
+  def mkconfig
+    execute(self.class.mkconfig_path, { failonfail: true, combine: false })
+  end
 
   # when both grub* providers match, prefer GRUB 2
   def self.specificity