F #2451: Add configurble hooks to the network drivers in the form of

pre.d, post.d and clean.d scripts

Co-authored-by: Daniel Clavijo Coca <dclavijo@opennebula.systems>

install.sh

@@ -289,14 +289,41 @@ VAR_DIRS="$VAR_LOCATION/remotes \
           $VAR_LOCATION/remotes/vmm/packet \
           $VAR_LOCATION/remotes/vnm \
           $VAR_LOCATION/remotes/vnm/802.1Q \
+          $VAR_LOCATION/remotes/vnm/802.1Q/pre.d \
+          $VAR_LOCATION/remotes/vnm/802.1Q/post.d \
+          $VAR_LOCATION/remotes/vnm/802.1Q/clean.d \
           $VAR_LOCATION/remotes/vnm/vxlan \
+          $VAR_LOCATION/remotes/vnm/vxlan/pre.d \
+          $VAR_LOCATION/remotes/vnm/vxlan/post.d \
+          $VAR_LOCATION/remotes/vnm/vxlan/clean.d \
           $VAR_LOCATION/remotes/vnm/dummy \
+          $VAR_LOCATION/remotes/vnm/dummy/pre.d \
+          $VAR_LOCATION/remotes/vnm/dummy/post.d \
+          $VAR_LOCATION/remotes/vnm/dummy/clean.d \
           $VAR_LOCATION/remotes/vnm/bridge \
+          $VAR_LOCATION/remotes/vnm/bridge/pre.d \
+          $VAR_LOCATION/remotes/vnm/bridge/post.d \
+          $VAR_LOCATION/remotes/vnm/bridge/clean.d \
           $VAR_LOCATION/remotes/vnm/ebtables \
+          $VAR_LOCATION/remotes/vnm/ebtables/pre.d \
+          $VAR_LOCATION/remotes/vnm/ebtables/post.d \
+          $VAR_LOCATION/remotes/vnm/ebtables/clean.d \
           $VAR_LOCATION/remotes/vnm/fw \
+          $VAR_LOCATION/remotes/vnm/fw/pre.d \
+          $VAR_LOCATION/remotes/vnm/fw/post.d \
+          $VAR_LOCATION/remotes/vnm/fw/clean.d \
           $VAR_LOCATION/remotes/vnm/ovswitch \
+          $VAR_LOCATION/remotes/vnm/ovswitch/pre.d \
+          $VAR_LOCATION/remotes/vnm/ovswitch/post.d \
+          $VAR_LOCATION/remotes/vnm/ovswitch/clean.d \
           $VAR_LOCATION/remotes/vnm/ovswitch_vxlan \
+          $VAR_LOCATION/remotes/vnm/ovswitch_vxlan/pre.d \
+          $VAR_LOCATION/remotes/vnm/ovswitch_vxlan/post.d \
+          $VAR_LOCATION/remotes/vnm/ovswitch_vxlan/clean.d \
           $VAR_LOCATION/remotes/vnm/vcenter \
+          $VAR_LOCATION/remotes/vnm/vcenter/pre.d \
+          $VAR_LOCATION/remotes/vnm/vcenter/post.d \
+          $VAR_LOCATION/remotes/vnm/vcenter/clean.d \
           $VAR_LOCATION/remotes/tm/ \
           $VAR_LOCATION/remotes/tm/dummy \
           $VAR_LOCATION/remotes/tm/shared \
@@ -1091,9 +1118,9 @@ NETWORK_EBTABLES_FILES="src/vnm_mad/remotes/ebtables/clean \
                     src/vnm_mad/remotes/ebtables/Ebtables.rb"
 
 NETWORK_FW_FILES="src/vnm_mad/remotes/fw/post \
-                          src/vnm_mad/remotes/fw/pre \
-                          src/vnm_mad/remotes/fw/update_sg \
-                          src/vnm_mad/remotes/fw/clean"
+                  src/vnm_mad/remotes/fw/pre \
+                  src/vnm_mad/remotes/fw/update_sg \
+                  src/vnm_mad/remotes/fw/clean"
 
 NETWORK_OVSWITCH_FILES="src/vnm_mad/remotes/ovswitch/clean \
                     src/vnm_mad/remotes/ovswitch/post \

src/vnm_mad/remotes/802.1Q/clean

@@ -32,7 +32,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.deactivate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.deactivate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/802.1Q/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/802.1Q/post

@@ -29,7 +29,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.activate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.activate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/802.1Q/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/802.1Q/pre

@@ -26,4 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = VLANTagDriver::XPATH_FILTER
 
 hm = VLANTagDriver.from_base64(template64, xpath_filter, deploy_id)
-exit hm.activate
+exit hm.run_hooks(ARGV, template64) if hm.activate == 0

src/vnm_mad/remotes/802.1Q/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/bridge/clean

@@ -27,9 +27,10 @@ xpath_filter = "TEMPLATE/NIC[VN_MAD='bridge']"
 
 begin
     hm = VNMMAD::NoVLANDriver.from_base64(template64, xpath_filter, deploy_id)
-    hm.deactivate
+    hm.run_hooks(ARGV, template64) if hm.deactivate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)
     exit 1
 end
+

src/vnm_mad/remotes/bridge/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/bridge/post

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env ruby
 
 # -------------------------------------------------------------------------- #
 # Copyright 2002-2019, OpenNebula Project, OpenNebula Systems                #
@@ -16,4 +16,12 @@
 # limitations under the License.                                             #
 #--------------------------------------------------------------------------- #
 
-exit 0
+$LOAD_PATH << File.dirname(__FILE__)
+$LOAD_PATH << File.join(File.dirname(__FILE__), '..')
+
+require 'vnmmad'
+
+template64 = STDIN.read
+
+hm = VNMMAD::VNMDriver.from_base64(template64)
+exit hm.run_hooks(ARGV, template64)

src/vnm_mad/remotes/bridge/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/bridge/pre

@@ -26,4 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = "TEMPLATE/NIC[VN_MAD='bridge']"
 
 hm = VNMMAD::NoVLANDriver.from_base64(template64, xpath_filter, deploy_id)
-exit hm.activate
+exit hm.run_hooks(ARGV, template64) if hm.activate == 0

src/vnm_mad/remotes/bridge/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/dummy/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/dummy/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/dummy/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ebtables/Ebtables.rb

@@ -95,7 +95,7 @@ class EbtablesVLAN < VNMMAD::NoVLANDriver
 
         super
 
-        return 0
+        0
     end
 
     def rules

src/vnm_mad/remotes/ebtables/clean

@@ -32,7 +32,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.deactivate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.deactivate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/ebtables/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ebtables/post

@@ -32,7 +32,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.activate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.activate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/ebtables/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ebtables/pre

@@ -26,4 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = EbtablesVLAN::XPATH_FILTER
 
 onevlan = EbtablesVLAN.from_base64(template64, xpath_filter, deploy_id)
-onevlan.activate
+onevlan.run_hooks(ARGV, template64) if onevlan.activate == 0

src/vnm_mad/remotes/ebtables/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/fw/clean

@@ -32,7 +32,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.deactivate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.deactivate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/fw/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/fw/post

@@ -29,7 +29,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.activate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.activate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/fw/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/fw/pre

@@ -26,4 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = "TEMPLATE/NIC[VN_MAD='fw']"
 
 hm = VNMMAD::NoVLANDriver.from_base64(template64, xpath_filter, deploy_id)
-exit hm.activate
+exit hm.run_hooks(ARGV, template64) if hm.activate == 0

src/vnm_mad/remotes/fw/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/lib/vlan.rb

@@ -64,7 +64,7 @@ module VNMMAD
 
             unlock
 
-            return 0
+            0
         end
 
         # This function needs to be implemented by any VLAN driver to
@@ -116,6 +116,8 @@ module VNMMAD
             end if @bridges
 
             unlock
+
+            0
         end
 
     private

src/vnm_mad/remotes/lib/vnm_driver.rb

@@ -15,6 +15,7 @@
 #--------------------------------------------------------------------------- #
 
 require 'shellwords'
+require 'open3'
 
 ################################################################################
 # The VNMMAD module provides the basic abstraction to implement custom
@@ -29,6 +30,7 @@ module VNMMAD
     # drivers FirewallDriver and SGDriver.
     ############################################################################
     class VNMDriver
+
         attr_reader :vm
 
         # Creates new driver using:
@@ -39,16 +41,16 @@ module VNMMAD
             @locking ||= false
 
             @vm = VNMNetwork::VM.new(REXML::Document.new(vm_tpl).root,
-                                        xpath_filter, deploy_id)
+                                     xpath_filter, deploy_id)
         end
 
         # Creates a new VNMDriver using:
         #   @param vm_64 [String] Base64 encoded XML String from oned
         #   @param deploy_id [String]
         def self.from_base64(vm_64, xpath_filter = nil, deploy_id = nil)
-            vm_xml = Base64::decode64(vm_64)
+            vm_xml = Base64.decode64(vm_64)
 
-            self.new(vm_xml, xpath_filter, deploy_id)
+            new(vm_xml, xpath_filter, deploy_id)
         end
 
         # Locking function to serialized driver operations if needed. Similar
@@ -56,7 +58,7 @@ module VNMMAD
         def lock
             if @locking
                 driver_name = self.class.name.downcase
-                @locking_file = File.open("/tmp/onevnm-#{driver_name}-lock","w")
+                @locking_file = File.open("/tmp/onevnm-#{driver_name}-lock", 'w')
                 @locking_file.flock(File::LOCK_EX)
             end
         end
@@ -64,19 +66,19 @@ module VNMMAD
         # Unlock driver execution mutex
         def unlock
             if @locking
-               @locking_file.close
+                @locking_file.close
             end
         end
 
         # Executes the given block on each NIC
-        def process(&block)
+        def process
             blk = lambda do |nic|
                 add_nic_conf(nic)
                 add_bridge_conf(nic)
                 add_ovs_bridge_conf(nic)
                 add_ip_link_conf(nic)
 
-                block.call(nic)
+                yield(nic)
             end
 
             @vm.each_nic(blk)
@@ -84,7 +86,7 @@ module VNMMAD
 
         # Parse network configuration and add it to the nic
         def add_nic_conf(nic)
-            return if nic[:conf] and nic[:conf].instance_of? Hash
+            return if nic[:conf] && nic[:conf].instance_of?(Hash)
 
             default_conf = CONF || {}
             nic_conf = {}
@@ -118,16 +120,16 @@ module VNMMAD
         end
 
         def add_command_conf(nic, conf_name)
-            return if nic[conf_name] and nic[conf_name].instance_of? Hash
+            return if nic[conf_name] && nic[conf_name].instance_of?(Hash)
 
             default_conf = CONF[conf_name] || {}
             nic_conf = {}
 
             # sanitize
             default_conf.each do |key, value|
-                option  = Shellwords.escape(key.to_s.strip.downcase)
+                option = Shellwords.escape(key.to_s.strip.downcase)
                 if value.class == String
-                    value   = Shellwords.escape(value.strip)
+                    value = Shellwords.escape(value.strip)
                 end
 
                 nic_conf[option] = value
@@ -138,7 +140,7 @@ module VNMMAD
                     if value == '__delete__'
                         nic_conf.delete(option.strip.downcase)
                     else
-                        option  = Shellwords.escape(option.strip.downcase)
+                        option = Shellwords.escape(option.strip.downcase)
                         if value == ''
                             value = nil
                         else
@@ -163,13 +165,13 @@ module VNMMAD
         # Returns the associated command including sudo and other configuration
         # attributes
         def command(cmd)
-            if VNMNetwork::COMMANDS.keys.include?(cmd.to_sym)
-                cmd_str = "#{VNMNetwork::COMMANDS[cmd.to_sym]}"
+            if VNMNetwork::COMMANDS.key?(cmd.to_sym)
+                cmd_str = (VNMNetwork::COMMANDS[cmd.to_sym]).to_s
             else
-                cmd_str = "#{cmd}"
+                cmd_str = cmd.to_s
             end
 
-            return cmd_str
+            cmd_str
         end
 
         def parse_options(string)
@@ -178,7 +180,7 @@ module VNMMAD
 
         def self.parse_options(string)
             options = {}
-            return options if !string
+            return options unless string
 
             string.split(',').each do |op|
                 m = op.match(/^\s*(?<option>[^=]+)\s*=\s*(?<value>.*?)\s*$/)
@@ -189,6 +191,43 @@ module VNMMAD
             options
         end
 
+        # Runs hooks in action.d directory inside the particular vnm driver
+        # Params:
+        # +args+::  +array+  Arguments passed to each script
+        # +stdin+:: +string+ Variable passed as Standard Input to each script
+        def run_hooks(args, stdin)
+            dir = "#{$PROGRAM_NAME}.d"
+
+            return 0 unless Dir.exist? dir
+            return 0 if Dir["#{dir}/*"].empty?
+
+            programs(dir).each do |file|
+                OpenNebula.log "Running #{file}"
+
+                cmd = "#{file} #{args.join(' ')}"
+
+                _o, e, s = Open3.capture3(cmd, :stdin_data => stdin.to_s)
+
+                raise "Error running #{file}\n#{e}" unless s.exitstatus.zero?
+            end
+
+            0
+        end
+
+        private
+
+        # returns files sorted alphabetically
+        # if executable by the user running this method
+        def programs(dir)
+            files = []
+
+            Dir["#{dir}/*"].each do |file|
+                files << file if File.executable?(file)
+            end
+
+            files.sort
+        end
+
     end
 
     # Returns true if the driver is executing action pre

src/vnm_mad/remotes/ovswitch/OpenvSwitch.rb

@@ -116,7 +116,7 @@ class OpenvSwitchVLAN < VNMMAD::VNMDriver
 
         unlock
 
-        return 0
+        0
     end
 
     def deactivate
@@ -162,6 +162,8 @@ class OpenvSwitchVLAN < VNMMAD::VNMDriver
         end
 
         unlock
+
+        0
     end
 
     def vlan

src/vnm_mad/remotes/ovswitch/clean

@@ -26,4 +26,4 @@ deploy_id    = nil
 xpath_filter = OpenvSwitchVLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVLAN.from_base64(template64, xpath_filter, deploy_id)
-ovs.deactivate
+ovs.run_hooks(ARGV, template64) if ovs.deactivate == 0

src/vnm_mad/remotes/ovswitch/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ovswitch/post

@@ -26,5 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = OpenvSwitchVLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVLAN.from_base64(template64, xpath_filter, deploy_id)
-
-ovs.activate
+ovs.run_hooks(ARGV, template64) if ovs.activate == 0

src/vnm_mad/remotes/ovswitch/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ovswitch/pre

@@ -26,5 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = OpenvSwitchVLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVLAN.from_base64(template64, xpath_filter, deploy_id)
-
-ovs.activate
+ovs.run_hooks(ARGV, template64) if ovs.activate == 0

src/vnm_mad/remotes/ovswitch/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ovswitch_vxlan/clean

@@ -26,4 +26,4 @@ deploy_id    = nil
 xpath_filter = OpenvSwitchVXLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVXLAN.from_base64(template64, xpath_filter, deploy_id)
-ovs.deactivate
+ovs.run_hooks(ARGV, template64) if ovs.deactivate == 0

src/vnm_mad/remotes/ovswitch_vxlan/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ovswitch_vxlan/post

@@ -26,5 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = OpenvSwitchVXLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVXLAN.from_base64(template64, xpath_filter, deploy_id)
-
-ovs.activate
+ovs.run_hooks(ARGV, template64) if ovs.activate == 0

src/vnm_mad/remotes/ovswitch_vxlan/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/ovswitch_vxlan/pre

@@ -26,5 +26,4 @@ deploy_id    = ARGV[0]
 xpath_filter = OpenvSwitchVXLAN::XPATH_FILTER
 
 ovs = OpenvSwitchVXLAN.from_base64(template64, xpath_filter, deploy_id)
-
-ovs.activate
+ovs.run_hooks(ARGV, template64) if ovs.activate == 0

src/vnm_mad/remotes/ovswitch_vxlan/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vcenter/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vcenter/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vcenter/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vxlan/clean

@@ -33,6 +33,7 @@ begin
                                                     xpath_filter,
                                                     deploy_id)
     filter_driver.deactivate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.deactivate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/vxlan/clean.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vxlan/post

@@ -29,7 +29,7 @@ begin
     filter_driver = VNMMAD::VNMDriver.filter_driver(template64,
                                                     xpath_filter,
                                                     deploy_id)
-    filter_driver.activate
+    filter_driver.run_hooks(ARGV, template64) if filter_driver.activate == 0
 rescue Exception => e
     OpenNebula.log_error(e.message)
     OpenNebula.log_error(e.backtrace)

src/vnm_mad/remotes/vxlan/post.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore

src/vnm_mad/remotes/vxlan/pre

@@ -25,6 +25,5 @@ template64   = STDIN.read
 deploy_id    = ARGV[0]
 xpath_filter = VXLANDriver::XPATH_FILTER
 
-
 hm = VXLANDriver.from_base64(template64, xpath_filter, deploy_id)
-exit hm.activate
+exit hm.run_hooks(ARGV, template64) if hm.activate == 0

src/vnm_mad/remotes/vxlan/pre.d/.gitignore

@@ -0,0 +1,3 @@
+# Do not track files in this directory except for .gitignore file
+*
+!.gitignore