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#
# Copyright:: 2018, Webb Agile Solutions Ltd.
# Copyright:: 2018, Chef Software Inc.
#
# 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.
#
require "chef/resource"
class Chef
class Resource
class Sysctl < Chef::Resource
resource_name :sysctl
provides :sysctl
provides :sysctl_param
description "Use the sysctl resource to set kernel parameters using the sysctl"\
" command line tool and configuration files in the system's sysctl.d directory."\
"Configuration files managed by this resource are named 99-chef-KEYNAME.conf. If"\
" an existing value was already set for the value it will be backed up to the node"\
" and restored if the :remove action is used later."
introduced "14.0"
property :key, String,
description: "",
name_property: true
property :ignore_error, [TrueClass, FalseClass],
description: "",
default: false
property :value, [Array, String, Integer, Float],
description: "",
coerce: proc { |v| coerce_value(v) },
required: true
property :conf_dir, String,
description: "",
default: "/etc/sysctl.d"
def after_created
raise "The systctl resource requires Linux as it needs sysctl and the systctl.d directory functionality." unless node["os"] == "linux"
raise "The systctl resource does not support SLES releases less than 12 as it requires a systctl.d directory" if platform_family?("suse") && node["platform_version"].to_i < 12
end
def coerce_value(v)
case v
when Array
v.join(" ")
else
v.to_s
end
end
def get_sysctl_value(key)
o = shell_out("sysctl -n -e #{key}")
raise "Unknown sysctl key #{key}!" if o.error!
o.stdout.to_s.tr("\t", " ").strip
end
load_current_value do
value get_sysctl_value(key)
if node.normal["sysctl"]["backup"][key].empty?
node.normal["sysctl"]["backup"][key] = value
end
end
action :apply do
converge_if_changed do
# set it temporarily
set_sysctl_param(new_resource.key, new_resource.value)
directory new_resource.conf_dir
file "#{new_resource.conf_dir}/99-chef-#{new_resource.key}.conf" do
content "#{new_resource.key} = #{new_resource.value}"
end
execute "sysctl -p" do
command "sysctl -p"
action :run
end
end
end
action :remove do
# only converge the resource if the file actually exists to delete
if ::File.exist?("#{new_resource.conf_dir}/99-chef-#{new_resource.key}.conf")
converge_by "removing systctl value #{new_resource.key}" do
file "#{new_resource.conf_dir}/99-chef-#{new_resource.key}.conf" do
action :delete
end
backup_value = node["sysctl"]["backup"][new_resource.key]
set_sysctl_param(new_resource.key, backup_value) unless backup_value.empty?
node.rm("sysctl", "backup", new_resource.key)
execute "sysctl -p" do
action :run
end
end
end
end
action_class do
def set_sysctl_param(key, value)
shell_out!("sysctl #{'-e ' if new_resource.ignore_error}-w \"#{key}=#{value}\"")
end
end
end
end
end
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