feat(e2e-test): Add e2e-tests for zfs-localpv (#298)

Signed-off-by: w3aman <aman.gupta@mayadata.io>

e2e-tests/experiments/functional/backup_and_restore/incremental_backup.yml

@@ -0,0 +1,85 @@
+- name: Obtain the mount path for the application
+  shell: > 
+      kubectl get pods -n {{ app_ns }} -l {{ app_label }} 
+      -o custom-columns=:.spec.containers[].volumeMounts[].mountPath --no-headers
+  args: 
+      executable: /bin/bash
+  register: mount
+
+- name: Record the mount path for the application
+  set_fact:
+    mount_path: "{{ mount.stdout }}"
+  
+- name: Dump some dummy data in application mount point
+  shell: >
+    kubectl exec -ti {{ app_pod_name }} -n {{ app_ns }} -- sh
+    -c "dd if=/dev/urandom of={{ mount_path }}/incr-file1 bs=4k count=1024 && 
+    md5sum {{ mount_path }}/incr-file1 > {{ mount_path }}/pre-incr-file1-md5 && sync;sync;sync"
+  args:
+    executable: /bin/bash
+  
+- name: Wait for some seconds
+  shell: sleep 60
+
+- name: Again dump some dummy data
+  shell: >
+    kubectl exec -ti {{ app_pod_name }} -n {{ app_ns }} -- sh
+    -c "dd if=/dev/urandom of={{ mount_path }}/incr-file2 bs=4k count=1024 && 
+    md5sum {{ mount_path }}/incr-file2 > {{ mount_path }}/pre-incr-file2-md5 && sync;sync;sync"
+  args:
+    executable: /bin/bash
+
+- name: Wait for some time to finish all incremental backup and at last full backup
+  shell: sleep 180
+
+- name: Get the first backup name which is full backup by default
+  shell: velero get backup | grep {{ schedule_name }} | tail -n1 | awk '{print $1}'
+  args:
+    executable: /bin/bash
+  register: first_full_bkp
+
+- name: Record the first full backup name
+  set_fact:
+    first_full_backup: "{{ first_full_bkp.stdout }}"
+
+- name: Get the first incremental backup name
+  shell: velero get backup | grep {{ schedule_name }} | tail -n2 | head -n1 | awk '{print $1}'
+  args:
+    executable: /bin/bash
+  register: first_incr_bkp
+
+- name: Record the first incremental backup name
+  set_fact:
+    first_incremental_backup: "{{ first_incr_bkp.stdout }}"
+
+- name: Get the second incremental backup name
+  shell: velero get backup | grep {{ schedule_name }} | tail -n3 | head -n1 | awk '{print $1}'
+  args:
+    executable: /bin/bash
+  register: second_incr_bkp
+  
+- name: Record the second incremental backup name
+  set_fact:
+    second_incremental_backup: "{{ second_incr_bkp.stdout }}"
+
+- name: Get the last full backup name which is after two incremental backups
+  shell: velero get backup | grep {{ schedule_name }} | tail -n4 | head -n1 | awk '{print $1}'
+  args:
+    executable: /bin/bash
+  register: last_full_bkp
+
+- name: Record the last full backup name
+  set_fact:
+    last_full_backup: "{{ last_full_bkp.stdout }}"
+
+- name: Check status of all four backups
+  shell: kubectl get backups.velero.io {{ item }} -n velero -o jsonpath='{.status.phase}'
+  args:
+    executable: /bin/bash
+  register: backup_status
+  failed_when: "backup_status.stdout != 'Completed'"
+  loop: 
+    - "{{ first_full_backup }}"
+    - "{{ first_incremental_backup }}"
+    - "{{ second_incremental_backup }}"
+    - "{{ last_full_backup }}"