Added basic validation of alt_images yml

Check if required properties are defined
Check if image names are unique

roles/altinstall/tasks/main.yml

@@ -1,5 +1,10 @@
 ---
 
+- name: validate images description
+  import_tasks: validate_input_yaml.yml
+  delegate_to: localhost
+  run_once: true
+
 - name: add extra APT repos on ALT Linux
   include_tasks: extra_repos_altlinux.yml
   when:

roles/altinstall/tasks/validate_input_yaml.yml

@@ -0,0 +1,22 @@
+---
+
+- name: check if names are defined
+  fail:
+    msg: "name should be defined for each image"
+  when: alt_images|selectattr("name", "undefined")|count != 0
+
+- name: check if names are non-empty
+  fail:
+    msg: "names should non-empty"
+  when: alt_images|selectattr("name", "eq", "")|count != 0
+
+- name: check if names are unique
+  fail:
+    msg: "image names must be unique"
+  when: alt_images|map(attribute='name')|unique|count != alt_images|count
+
+- name: check required properties
+  include_tasks: validate_input_yaml_entry.yml
+  loop: "{{ alt_images }}"
+  loop_control:
+    label: "{{ item.name }}"

roles/altinstall/tasks/validate_input_yaml_entry.yml

@@ -0,0 +1,42 @@
+
+- name: fail if url is missing
+  fail:
+    msg: "{{ item.name }}: url is undefined"
+  when: item.url is undefined
+
+- name: fail if checksum is missing
+  fail:
+    msg: "{{ item.name }}: checksum is undefined"
+  when: 
+    - not(item.skip_iso_deploy|default('false')|bool)
+    - item.checksum is undefined or item.checksum.sha256 is undefined
+
+- name: check if alt_arch is defined
+  fail:
+    msg: "{{ item.name }}: alt_arch is undefined"
+  when: item.alt_arch is undefined
+
+- name: check if grub_arch is defined
+  fail:
+    msg: "{{ item.name }}: grub_arch is undefined"
+  when: item.grub_arch is undefined
+
+- name: check if kernel is defined
+  fail:
+    msg: "{{ item.name }}: kernel is undefined"
+  when: item.kernel is undefined
+
+- name: check if initrd is defined
+  fail:
+    msg: "{{ item.name }}: initrd is undefined"
+  when: item.initrd is undefined
+
+- name: check if altinst_size is defined
+  fail:
+    msg: "{{ item.name }}: initrd is undefined"
+  when: item.altinst_size is undefined
+
+- name: check if live_size is defined
+  fail:
+    msg: "{{ item.name }}: initrd is undefined"
+  when: item.live_size is undefined