fb_systemd: add a knob to disable service restart for networkd

Reviewed By: dafyddcrosby

Differential Revision: D91718540

fbshipit-source-id: 6859cbd1ba3ff379cbe07caea38368b96625b902

Author: joshuamiller01

cookbooks/fb_systemd/README.md

@@ -24,6 +24,7 @@ Attributes
 * node['fb_systemd']['logind']['enable']
 * node['fb_systemd']['logind']['config']
 * node['fb_systemd']['networkd']['enable']
+* node['fb_systemd']['networkd']['disable_restart']
 * node['fb_systemd']['networkd']['config']
 * node['fb_systemd']['nspawn']['enable']
 * node['fb_systemd']['resolved']['enable']
@@ -369,6 +370,9 @@ drop `netdev`, `link`, `network` definitions under `/etc/systemd/network` from
 another cookbook you'll want to request a restart of the `systemd-networkd`
 service.
 
+You can choose to disable chef restarts of `systemd-networkd` with the
+`node['fb_systemd']['networkd']['disable_restart']` attribute, which defaults to `false`.
+
 ### resolved configuration
 You can choose whether or not to enable `systemd-resolved` with the
 `node['fb_systemd']['resolved']['enable']` attribute, which defaults to

cookbooks/fb_systemd/attributes/default.rb

@@ -114,6 +114,7 @@
   },
   'networkd' => {
     'enable' => enable_networkd,
+    'disable_restart' => false,
     'use_networkd_socket_with_networkd' => false,
     'config' => {},
   },

cookbooks/fb_systemd/recipes/networkd.rb

@@ -81,6 +81,7 @@
 
 service 'systemd-networkd.service' do
   only_if { node['fb_systemd']['networkd']['enable'] }
+  not_if { node['fb_systemd']['networkd']['disable_restart'] }
   action [:enable, :start]
 end