Add 'disable_makecache' API

Differential Revision: D55318525

fbshipit-source-id: 23e2bcb990319bbb7c3c05f97111cd8a2f7fefc0

cookbooks/fb_dnf/README.md

@@ -7,6 +7,7 @@ Requirements
 Attributes
 ----------
 * node['fb_dnf']['config'][$SECTION][$KEY][$VALUE]
+* node['fb_dnf']['disable_makecache_timer']
 * node['fb_dnf']['manage_packages']
 * node['fb_dnf']['modules'][$MODULE][$CONFIG]
 * node['fb_dnf']['repos'][$GROUP]['repos'][$REPO][$KEY][$VALUE]
@@ -49,6 +50,13 @@ ways:
 These are not mutually exclusive and can be mixed as desired. See the README
 for `fb_yum_repos` for details on how to define repositories.
 
+### Disable dnf-makecache.timer
+
+The dnf RPM includes a default make cache timer. This is not always required
+depending how one wants to use dnf. Set
+`node['fb_dnf']['disable_makecache_timer']` API to `true` to stop this periodic
+refresh of the dnf metadata cache.
+
 ### Modularity support
 DNF supports modules which may need to be enabled, disabled, or default. You
 can use `node['fb_dnf']['modules']` to configure modules. Do this via:

cookbooks/fb_dnf/attributes/default.rb

@@ -26,6 +26,7 @@
       'skip_if_unavailable' => node.centos? ? false : true,
     },
   },
+  'disable_makecache_timer' => false,
   'manage_packages' => true,
   'modules' => {},
   'repos' => {},

cookbooks/fb_dnf/recipes/default.rb

@@ -46,3 +46,5 @@
 end
 
 include_recipe 'fb_dnf::packages'
+# Need RPMs installed before we can disable/enable the makecache timer
+include_recipe 'fb_dnf::makecache'

cookbooks/fb_dnf/recipes/makecache.rb

@@ -0,0 +1,18 @@
+# (c) Meta Platforms, Inc. and its affiliates. Confidential and proprietary.
+#
+# Cookbook Name:: fb_dnf
+# Recipe:: makecache
+
+MAKECACHE_SYSTEMD_UNIT_NAME = 'dnf-makecache.timer'.freeze
+
+# If API is set to true, stop + disable the timer
+systemd_unit MAKECACHE_SYSTEMD_UNIT_NAME do
+  only_if { node['fb_dnf']['disable_makecache_timer'] }
+  action [:stop, :disable]
+end
+
+# If API is set to false, start + enable the timer
+systemd_unit MAKECACHE_SYSTEMD_UNIT_NAME do
+  not_if { node['fb_dnf']['disable_makecache_timer'] }
+  action [:start, :enable]
+end