ANSUPDATE-126 Backup/Restore /tftpboot

Backup and restore tftpboot as ironic does not recreate files
necessary for overcloud nodes to boot.

Change-Id: Ibdc8b41be480f9344e0ba014bb0017591c603257

playbooks/step_undercloud_backup_tftpboot.yml

@@ -0,0 +1,21 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+---
+- name: "Purge previous backup folder"
+  sudo: yes
+  file: path=/mnt/state/_upgrade_backup_tftpboot.tar.bz state=absent
+- name: "Backup /tftpboot"
+  sudo: yes
+  command: tar --exclude='pxelinux.0' -cvjf /mnt/state/_upgrade_backup_tftpboot.tar.bz /tftpboot

playbooks/step_undercloud_restore_tftpboot.yml

@@ -0,0 +1,18 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+---
+- name: "Restore /tftpboot contents"
+  sudo: yes
+  command: tar -C / -xvjf /mnt/state/_upgrade_backup_tftpboot.tar.bz tftpboot

playbooks/update_cloud.yml

@@ -172,6 +172,8 @@
   tasks:
     - include: step_preserve_password_file.yml
       when: instance_status == "ACTIVE"
+    - include: step_undercloud_backup_tftpboot.yml
+      when: instance_status == "ACTIVE"
     - include: preserve_ssh_host_keys.yml
       when: instance_status == "ACTIVE"
     - include: step_unmount.yml
@@ -196,6 +198,7 @@
     - include: step_reset_mnt_state_permissions.yml
     # Directly call os-apply-config to write out configuration files.
     - include: step_os-apply-config.yml
+    - include: step_undercloud_restore_tftpboot.yml
     - include: start_mysql.yml
     - include: start_rabbitmq.yml
     # Fix Ironic Reservations due to bug: