Update more cookbooks

cookbooks/chef_client_updater/README.md

@@ -18,10 +18,16 @@ This cookbook updates the chef-client
 
 - compat_resource
 
-### Usage
+## Usage
 
 This cookbook provides both a custom resource and a default recipe. The default recipe simply uses the custom resource with a set of attributes. You can add chef_client_updater::default to your run list or use the custom resource in a wrapper cookbook.
 
+### Init System Caveats
+
+When Chef runs as a service under a system init daemon such as Sys-V or systemd each chef run forks off from the main chef-client process being managed by the init system. For a chef-client upgrade to occur the running chef-client as well as the parent process must be killed, and a new chef-client must start using the updated binaries. This cookbook handles killing the chef-client, but your init system must properly handle starting the service back up. For systemd and upstart this can be handled via configuration, and chef-client cookbook 8.1.1 or later handles this by default. This functionality is not available in sys-v (RHEL 6, Debian 7, and others), so you will need to employ a secondary process such as a monitoring system to start the chef-client service.
+
+## Resources
+
 ### chef_client_updater
 
 Installs the mixlib-install/mixlib-install gems and upgrades the chef-client.
@@ -34,6 +40,8 @@ Installs the mixlib-install/mixlib-install gems and upgrades the chef-client.
 - `post_install_action` - After installing the chef-client what should we do. `exec` to exec the new client or `kill` to kill the client and rely on the init system to start up the new version. Default: `exec`
 - `exec_command` - The chef-client command. default: $PROGRAM_NAME.split(' ').first
 - `exec_args` - An array of arguments to exec the chef-client with. default: ARGV
+- `download_url_override` - The direct URL for the chef-client package.
+- `checksum` - The SHA-256 checksum of the chef-client package from the direct URL.
 
 #### examples