Add a STONITH recipe

By default, STONITH is marked as disabled. It can be enabled and
configured:

 - manually (by the user)
 - with a stonith plugin that will be used with a clone resource
 - with a stonith plugin that will have per-node parameters

attributes/default.rb

@@ -32,5 +32,22 @@ end
 
 default[:pacemaker][:founder] = false
 default[:pacemaker][:crm][:initial_config_file] = "/etc/corosync/crm-initial.conf"
-default[:pacemaker][:crm][:stonith_enabled] = false
 default[:pacemaker][:crm][:no_quorum_policy] = "ignore"
+
+# Values can be "disabled", "manual", "clone", "per_node"
+default[:pacemaker][:stonith][:mode] = "disabled"
+
+default[:pacemaker][:stonith][:clone][:plugin] = ""
+# This can be either a string (containing a list of parameters) or a hash.
+# For instance:
+#   default[:pacemaker][:stonith][:clone][:params] = 'hostname="foo" password="bar"'
+# will give the same result as:
+#   default[:pacemaker][:stonith][:clone][:params] = {"hostname" => "foo", "password" => "bar"}
+default[:pacemaker][:stonith][:clone][:params] = {}
+
+default[:pacemaker][:stonith][:per_node][:plugin] = ""
+# This hash will contain parameters for each node. See documentation for
+# default[:pacemaker][:stonith][:clone][:params] about the format.
+# For instance:
+#  default[:pacemaker][:stonith][:per_node][:nodes][$node][:params] = 'hostname="foo" password="bar"'
+default[:pacemaker][:stonith][:per_node][:nodes] = {}

recipes/default.rb

@@ -61,3 +61,5 @@ if platform_family? "rhel"
     notifies :restart, "service[clvm]", :immediately
   end
 end
+
+include_recipe "pacemaker::stonith"

recipes/setup.rb

@@ -26,7 +26,7 @@ template crm_conf do
   group "root"
   mode 0600
   variables(
-    :stonith_enabled => node[:pacemaker][:crm][:stonith_enabled],
+    :stonith_enabled => (node[:pacemaker][:stonith][:mode] != "disabled"),
     :no_quorum_policy => node[:pacemaker][:crm][:no_quorum_policy]
   )
 end

recipes/stonith.rb

@@ -0,0 +1,102 @@
+#
+# Author:: Vincent Untz
+# Cookbook Name:: pacemaker
+# Recipe:: stonith
+#
+# Copyright 2014, SUSE
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# FIXME: delete old resources when switching mode (or plugin!)
+# FIXME: check that the stonith plugin to use exists with stonith -L
+
+case node[:pacemaker][:stonith][:mode]
+when "disabled"
+when "manual"
+  # nothing!
+
+when "clone"
+  plugin = node[:pacemaker][:stonith][:clone][:plugin]
+  params = node[:pacemaker][:stonith][:clone][:params]
+
+  if params.respond_to?('to_hash')
+    primitive_params = params.to_hash
+  elsif params.is_a?(String)
+    primitive_params = ::Pacemaker::Resource.extract_hash("params #{params}", "params")
+  else
+    message = "Unknown format for STONITH clone parameters: #{params.inspect}."
+    Chef::Log.fatal(message)
+    raise message
+  end
+
+  unless primitive_params.has_key?("hostlist")
+    message = "Missing hostlist parameter for STONITH clone!"
+    Chef::Log.fatal(message)
+    raise message
+  end
+
+  pacemaker_primitive "stonith-clone" do
+    agent "stonith:#{plugin}"
+    params primitive_params
+    action :create
+  end
+
+  pacemaker_clone "fencing" do
+    rsc "stonith-clone"
+    action :create
+  end
+
+when "per_node"
+  plugin = node[:pacemaker][:stonith][:per_node][:plugin]
+
+  node[:pacemaker][:stonith][:per_node][:nodes].keys.each do |node_name|
+    stonith_resource = "stonith-#{node_name}"
+    params = node[:pacemaker][:stonith][:per_node][:nodes][node_name][:params]
+
+    if params.respond_to?('to_hash')
+      primitive_params = params.to_hash
+    elsif params.is_a?(String)
+      primitive_params = ::Pacemaker::Resource.extract_hash("params #{params}", "params")
+    else
+      message = "Unknown format for STONITH per-node parameters of #{node_name}: #{params.inspect}."
+      Chef::Log.fatal(message)
+      raise message
+    end
+
+    # Only set hostlist param if it's missing; we do not overwrite it as the
+    # user might have passed more information than just the hostname (some
+    # plugins accept hostname:data in hostlist)
+    unless primitive_params.has_key?("hostlist")
+      primitive_params["hostlist"] = node_name
+    end
+
+    pacemaker_primitive stonith_resource do
+      agent "stonith:#{plugin}"
+      params primitive_params
+      action :create
+    end
+
+    pacemaker_location "l-#{stonith_resource}" do
+      rsc stonith_resource
+      score "-inf"
+      node node_name
+      action :create
+    end
+  end
+
+else
+  message = "Unknown STONITH mode: #{node[:pacemaker][:stonith][:mode]}."
+  Chef::Log.fatal(message)
+  raise message
+end