Debian: Backup and Restore fixes for home dir

On Debian  /home is a symlink to /var/home

The following items are now fixed on Debian:
 - disk usage of /home would have always returned zero.
 - The backup of the /home directory would have only
included a symlink, and none of the contents.
 - The restore would have failed due to not finding a
valid /home subdirectory from a Debian backup.
 - The restore can now detect /var/home and extract it
if it exists, otherwise extracting /home (ie: CentOS)

Test Plan:
 PASS: Backup(Centos) / Restore(CentOS)
 PASS: Backup(Debian) / Restore(Debian)

Closes-Bug: #1980980
Signed-off-by: Al Bailey <al.bailey@windriver.com>
Change-Id: I564c05822483f2b3fcd9f20320b0445a97d7f399

playbookconfig/src/playbooks/roles/backup/backup-system/tasks/main.yml

@@ -224,7 +224,7 @@
       shell: "du -sh -k  {{ item }} | awk '{print $1}'"
       with_items:
         - /etc
-        - /home
+        - "{{ homedir }} "
         - "{{ config_permdir }}"
         - "{{ sysinv_permdir }}"
         - "{{ puppet_permdir }}/hieradata"
@@ -506,7 +506,7 @@
       shell: "tar -czf {{ platform_backup_file_path }} $(ls -d \
            {{ override_backup_file }} \
            /etc \
-           /home \
+           {{ homedir }} \
            {{ config_permdir }} \
            {{ sysinv_permdir }} \
            {{ puppet_permdir }}/hieradata \

playbookconfig/src/playbooks/roles/backup/prepare-env/tasks/main.yml

@@ -29,8 +29,12 @@
     msg: "Backup can only be done on the active controller."
   when: active_ctlr.rc != 0
 
+- name: Declare homedir fact
+  set_fact:
+    homedir: "{{ '/home' if os_release == 'centos' else '/var/home' }}"
+
 - name: Check disk usage of /home directory
-  shell: "du -sh -m  /home | awk '{print $1}'"
+  shell: "du -sh -m  {{ homedir }}  | awk '{print $1}'"
   register: home_dir_usage
 
 - name: Fail if disk usage of /home directory is over {{ max_home_dir_usage }}MB

playbookconfig/src/playbooks/roles/restore-platform/restore-more-data/tasks/main.yml

@@ -253,8 +253,25 @@
     path: "{{ staging_dir }}/ldap.db"
     state: absent
 
+# In order to determine the home dir pattern of the backed up data
+# we only check var/home and use that to know how to extract.
+# /var/home will exist on Debian, and not on CentOS. Cannot use /home
+# because it exists in both (a directory vs a symlink)
+# This enables home directory content of a CentOS backup to be restored
+# on Debian during upgrade.
+- name: Check if var/home directory is in the backup tarball
+  command: "tar -tf {{ restore_data_file }} var/home"
+  args:
+    warn: false
+  failed_when: false
+  register: debian_homedir
+
+- name: Set the home directory to extract
+  set_fact:
+    home_dir_pattern: "{{ 'var/home/*' if debian_homedir.rc == 0 else 'home/*' }} "
+
 - name: Restore home directory
-  shell: tar -C / --wildcards --overwrite -xpf {{ restore_data_file }} 'home/*'
+  shell: tar -C / --wildcards --overwrite -xpf {{ restore_data_file }} {{ home_dir_pattern }}
   args:
     warn: false
   become_user: root