specify a single volume in the role instead of a list (#15)

.gitignore

@@ -1,2 +1,3 @@
 .idea
+__pycache__
 venv

roles/docker_s3_volume_restore/defaults/main.yml

@@ -7,10 +7,13 @@ docker_backup_restore_force: false
 # backup in the s3 backup. The format which is expected has the prefix of volume_name/volume_name_*
 # this is the format the the "docker_s3_backup" role updloads them with.
 docker_backup_restore_latest_s3_key: false
-docker_backup_s3_restores: []
-# docker_backup_s3_restores:
-#  - volume_name: "linkding_data"
-#    s3_key: "linkding_data/linkding_data-2022-09-01T21:32:54Z.tar.gz"
+docker_backup_s3_volume:
+  name: ""
+  s3_key: "" # optional
+
+# docker_backup_s3_volume:
+#   name: linkding
+#   s3_key: "linkding_data/linkding_data-2022-09-01T21:32:54Z.tar.gz"
 
 # dynamically find the latest linkding_data backup.
 # docker_backup_restore_latest_s3_key: true
@@ -23,3 +26,7 @@ docker_backup_aws_s3_url: ""
 docker_backup_aws_s3_aws_access_key: ""
 docker_backup_aws_s3_aws_secret_key: ""
 docker_backup_aws_s3_permissions: []
+
+# fail on no S3 backups causes the task to fail if there are no s3 backups.
+# setting this to true will cause the restore task to end early if there are no backups.
+docker_backup_fail_on_no_s3_backups: true

roles/docker_s3_volume_restore/tasks/main.yml

@@ -4,77 +4,73 @@
 
 - name: Ensure Volume.
   docker_volume:
-    name: "{{ item.volume_name }}"
+    name: "{{ docker_backup_s3_volume.name }}"
     state: present
   register: volume_out
-  with_items: "{{ docker_backup_s3_restores }}"
 
 - name: Determine if backup is needed.
-  ansible.builtin.set_fact: should_perform_backup="{{ docker_backup_restore_force == true or volume_out.changed == true }}"
-
-- name: End play as no backup is needed.
-  ansible.builtin.meta: end_play
-  when: not should_perform_backup
+  ansible.builtin.set_fact: should_perform_backup="{{ docker_backup_restore_force or volume_out.changed }}"
 
 # try and find latest volume based on the name.
 - name: Find latest s3 version.
-  when: docker_backup_restore_latest_s3_key
+  when:
+    - should_perform_backup
+    - docker_backup_restore_latest_s3_key
   amazon.aws.aws_s3:
     bucket: "{{ docker_backup_aws_s3_bucket }}"
     mode: list
-    prefix: "{{ item.volume_name }}/{{ item.volume_name }}"
+    prefix: "{{ docker_backup_s3_volume.name }}/{{ docker_backup_s3_volume.name }}"
     aws_access_key: "{{ docker_backup_aws_s3_aws_access_key }}"
     aws_secret_key: "{{ docker_backup_aws_s3_aws_secret_key }}"
     region: "{{ docker_backup_aws_s3_region }}"
     s3_url: "{{ docker_backup_aws_s3_url }}"
   register: s3_list_output
-  with_items: "{{ docker_backup_s3_restores }}"
-
-- name: Extract S3 keys for container.
-  when: docker_backup_restore_latest_s3_key
-  ansible.builtin.set_fact: container_s3_keys="{{ container_s3_keys | default([]) + [item.s3_keys | last] }}"
-  with_items: "{{ s3_list_output.results }}"
 
-- name: Extract volume names.
-  ansible.builtin.set_fact: volume_names="{{ docker_backup_s3_restores | map(attribute='volume_name') }}"
-  when: docker_backup_restore_latest_s3_key
+- name: Fail as there no backups were found.
+  when:
+    - should_perform_backup
+    - docker_backup_fail_on_no_s3_backups
+    - s3_list_output.s3_keys | length == 0
+  ansible.builtin.fail:
+    msg: "There were no s3 backups found for {{ docker_backup_s3_volume.name }}"
 
-- name: Merge volume names and S3 keys.
-  ansible.builtin.set_fact:
-    docker_backup_s3_restores_new: "{{ docker_backup_s3_restores_new | default([]) + [ {'volume_name': item.0, 's3_key': item.1} ] }}"
-  when: docker_backup_restore_latest_s3_key
-  with_together:
-    - "{{ volume_names }}"
-    - "{{ container_s3_keys }}"
-
-- name: Set volumes to restore.
-  ansible.builtin.set_fact:
-    docker_backup_s3_restores_new: "{{ docker_backup_s3_restores }}"
-  when: not docker_backup_restore_latest_s3_key
+- name: Extract S3 keys for container.
+  when:
+    - should_perform_backup
+    - docker_backup_restore_latest_s3_key
+    - s3_list_output.s3_keys | length > 0
+  ansible.builtin.set_fact: container_s3_key="{{ s3_list_output.s3_keys | last }}"
 
 - name: Create directories for /tmp file.
+  when:
+    - should_perform_backup
+    - s3_list_output.s3_keys | length > 0
   ansible.builtin.file:
-    path: '/tmp/{{ item.s3_key | dirname }}'
+    path: '/tmp/{{ container_s3_key | dirname }}'
     state: directory
     mode: '0755'
-  with_items: '{{ docker_backup_s3_restores_new }}'
 
 - name: Download archive from S3.
+  when:
+    - should_perform_backup
+    - s3_list_output.s3_keys | length > 0
   amazon.aws.aws_s3:
     bucket: "{{ docker_backup_aws_s3_bucket }}"
-    object: "{{ item.s3_key }}"
+    object: "{{ container_s3_key }}"
     aws_access_key: "{{ docker_backup_aws_s3_aws_access_key }}"
     aws_secret_key: "{{ docker_backup_aws_s3_aws_secret_key }}"
     region: "{{ docker_backup_aws_s3_region }}"
     s3_url: "{{ docker_backup_aws_s3_url }}"
     mode: get
-    dest: "/tmp/{{ item.s3_key }}"
+    dest: "/tmp/{{ container_s3_key }}"
   register: get_out
-  with_items: "{{ docker_backup_s3_restores_new }}"
 
 - name: Remove contents of volumes.
+  when:
+    - should_perform_backup
+    - s3_list_output.s3_keys | length > 0
   community.docker.docker_container:
-    name: "restore-container-{{ item.volume_name }}-{{ 10 | random }}"
+    name: "restore-container-{{ docker_backup_s3_volume.name }}-{{ 100 | random }}"
     image: ubuntu
     command: "rm -rf ./*"
     auto_remove: true
@@ -83,25 +79,28 @@
     # start inside the directory we want to wipe
     working_dir: "/data"
     volumes:
-      - "{{ item.volume_name }}:/data"
-  with_items: "{{ docker_backup_s3_restores_new }}"
+      - "{{ docker_backup_s3_volume.name }}:/data"
 
 - name: Restore contents of volumes
+  when:
+    - should_perform_backup
+    - s3_list_output.s3_keys | length > 0
   community.docker.docker_container:
-    name: "restore-container-{{ item.volume_name }}-{{ 10 | random }}"
+    name: "restore-container-{{ docker_backup_s3_volume.name }}-{{ 100 | random }}"
     image: ubuntu
     # extract the tar into the volume.
-    command: "tar xvf /tmp/{{ item.s3_key }} -C /data --strip-components 1"
+    command: "tar xvf /tmp/{{ container_s3_key }} -C /data --strip-components 1"
     auto_remove: true
     detach: false # block until this container exists.
     state: started
     volumes:
-      - "{{ item.volume_name }}:/data"
+      - "{{ docker_backup_s3_volume.name }}:/data"
       - /tmp:/tmp
-  with_items: "{{ docker_backup_s3_restores_new }}"
 
 - name: Remove uploaded files from /tmp
+  when:
+    - should_perform_backup
+    - s3_list_output.s3_keys | length > 0
   ansible.builtin.file:
-    path: '/tmp/{{ item.s3_key }}'
+    path: '/tmp/{{ container_s3_key }}'
     state: absent
-  with_items: '{{ docker_backup_s3_restores_new }}'

tests/playbook.yml

@@ -2,8 +2,9 @@
 - hosts: localhost
   connection: local
   become: true
-
   tasks:
+  - set_fact:
+      portainer_password: "portainer-password-{{ 10000 | random }}"
   - name: Install Docker Module for Python
     pip:
       name:
@@ -50,7 +51,7 @@
       method: POST
       body:
         Username: admin
-        Password: "adminadminadmin"
+        Password: "{{ portainer_password }}"
       status_code: 200
       body_format: json
     register: result
@@ -79,8 +80,8 @@
       name: docker_s3_volume_restore
     vars:
       docker_backup_restore_latest_s3_key: true
-      docker_backup_s3_restores:
-        - volume_name: portainer_data
+      docker_backup_s3_volume:
+        name: portainer_data
 
   - name: Deploy Portainer
     docker_compose:
@@ -93,7 +94,7 @@
       method: POST
       body:
         Username: admin
-        Password: "adminadminadmin"
+        Password: "{{ portainer_password }}"
       status_code: 200
       body_format: json
     register: result