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#
# Resource:: kernel_module
#
# The MIT License (MIT)
#
# Copyright 2016-2018, Shopify Inc.
# Copyright 22018, Chef Software, Inc.
require "chef/resource"
class Chef
class Resource
class KernelModule < Chef::Resource
resource_name :kernel_module
provides(:kernel_module) { true }
description "Use the kernel_module resource to manage kernel modules on Linux systems. This resource can load, unload, blacklist, install, and uninstall modules."
introduced "15.0"
property :modname, String,
description: "The name of the kernel module.",
name_property: true, identity: true
property :load_dir, String,
description: "The directory to load modules from.",
default: "/etc/modules-load.d"
property :unload_dir, String,
description: "The modprobe.d directory.",
default: "/etc/modprobe.d"
action :install do
description "Load kernel module, and ensure it loads on reboot"
declare_resource(:directory, new_resource.load_dir) do
recursive true
end
declare_resource(:file, "#{new_resource.load_dir}/#{new_resource.modname}.conf") do
content "#{new_resource.modname}\n"
notifies :run, "execute[update initramfs]"
end
declare_resource(:execute, "update initramfs") do
command initramfs_command
action :nothing
end
new_resource.run_action(:load)
end
action :uninstall do
description "Unload a kernel module and remove module config, so it doesn't load on reboot."
declare_resource(:file, "#{new_resource.load_dir}/#{new_resource.modname}.conf") do
action :delete
notifies :run, "execute[update initramfs]"
end
declare_resource(:file, "#{new_resource.unload_dir}/blacklist_#{new_resource.modname}.conf") do
action :delete
notifies :run, "execute[update initramfs]"
end
declare_resource(:execute, "update initramfs") do
command initramfs_command
action :nothing
end
new_resource.run_action(:unload)
end
action :blacklist do
description "Blacklist a kernel module."
declare_resource(:file, "#{new_resource.unload_dir}/blacklist_#{new_resource.modname}.conf") do
content "blacklist #{new_resource.modname}"
notifies :run, "execute[update initramfs]"
end
declare_resource(:execute, "update initramfs") do
command initramfs_command
action :nothing
end
new_resource.run_action(:unload)
end
action :load do
description "Load a kernel module."
unless module_loaded?
converge_by("load kernel module #{new_resource.modname}") do
shell_out!("modprobe #{new_resource.modname}")
end
end
end
action :unload do
description "Unload kernel module"
if module_loaded?
converge_by("unload kernel module #{new_resource.modname}") do
shell_out!("modprobe -r #{new_resource.modname}")
end
end
end
action_class do
# determine the correct command to regen the initramfs based on platform
# @return [String]
def initramfs_command
if platform_family?("debian")
"update-initramfs -u"
else
"dracut -f"
end
end
# see if the module is listed in /proc/modules or not
# @return [Boolean]
def module_loaded?
/^#{new_resource.modname}/.match?(::File.read("/proc/modules"))
end
end
end
end
end
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