kubevirt_vm_info: Add info module for VirtualMachines

This adds the kubevirt_vm_info module, which returns the same results as
the kubevirt_vm module, but is limited to read-only functionality.

Signed-off-by: Felix Matouschek <fmatouschek@redhat.com>

tests/integration/targets/kubevirt_vm_info/playbook.yml

@@ -0,0 +1,68 @@
+---
+- name: Create VM
+  connection: local
+  gather_facts: false
+  hosts: localhost
+  tasks:
+    - name: Create a VirtualMachine
+      kubevirt.core.kubevirt_vm:
+        name: testvm
+        namespace: default
+        instancetype:
+          name: u1.small
+        preference:
+          name: centos.9.stream
+        spec:
+          domain:
+            devices: {}
+          volumes:
+            - containerDisk:
+                image: quay.io/containerdisks/centos-stream:9
+              name: containerdisk
+        state: present
+        wait: true
+        wait_timeout: 600
+
+- name: Describe created VM
+  connection: local
+  gather_facts: false
+  hosts: localhost
+  tasks:
+    - name: Describe a VirtualMachine
+      kubevirt.core.kubevirt_vm_info:
+        name: testvm
+        namespace: default
+      register: describe
+    - name: Assert module reported no changes
+      ansible.builtin.assert:
+        that:
+          - not describe.changed
+          - describe.resources | length == 1
+
+- name: Delete VM
+  connection: local
+  gather_facts: false
+  hosts: localhost
+  tasks:
+    - name: Delete a VirtualMachine
+      kubevirt.core.kubevirt_vm:
+        name: testvm
+        namespace: default
+        state: absent
+        wait: true
+
+- name: Verify VM deletion
+  connection: local
+  gather_facts: false
+  hosts: localhost
+  tasks:
+    - name: Delete a VirtualMachine
+      kubevirt.core.kubevirt_vm:
+        name: testvm
+        namespace: default
+        state: absent
+      register: delete
+    - name: Assert module reported no changes
+      ansible.builtin.assert:
+        that:
+          - not delete.changed

tests/integration/targets/kubevirt_vm_info/runme.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -eux
+set -o pipefail
+
+{
+export ANSIBLE_CALLBACKS_ENABLED=profile_tasks
+ansible-playbook playbook.yml "$@"
+} || {
+    exit 1
+}

tests/unit/modules/test_module_kubevirt_vm_info.py

@@ -0,0 +1,93 @@
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2021, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
+from unittest import TestCase
+from unittest.mock import patch
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible_collections.kubernetes.core.plugins.module_utils.k8s.service import (
+    K8sService,
+)
+from ansible_collections.kubevirt.core.plugins.modules import (
+    kubevirt_vm_info,
+)
+from ansible_collections.kubevirt.core.tests.unit.utils.ansible_module_mock import (
+    AnsibleExitJson,
+    exit_json,
+    fail_json,
+    set_module_args,
+    get_api_client,
+)
+
+FIXTURE1 = {
+    "kind": "VirtualMachine",
+    "api_version": "kubevirt.io/v1",
+    "name": None,
+    "namespace": None,
+    "label_selectors": [],
+    "field_selectors": [],
+    "wait": False,
+    "wait_sleep": 5,
+    "wait_timeout": 120,
+    "condition": {"type": "Ready", "status": True},
+}
+
+FIXTURE2 = {
+    "kind": "VirtualMachine",
+    "api_version": "kubevirt.io/v1",
+    "name": "testvm",
+    "namespace": "default",
+    "label_selectors": [],
+    "field_selectors": [],
+    "wait": False,
+    "wait_sleep": 5,
+    "wait_timeout": 120,
+    "condition": {"type": "Ready", "status": True},
+}
+
+
+class TestDescribeVM(TestCase):
+    def setUp(self):
+        self.mock_module_helper = patch.multiple(
+            AnsibleModule, exit_json=exit_json, fail_json=fail_json
+        )
+        self.mock_module_helper.start()
+
+        self.mock_main = patch.multiple(kubevirt_vm_info, get_api_client=get_api_client)
+        self.mock_main.start()
+
+        # Stop the patch after test execution
+        # like tearDown but executed also when the setup failed
+        self.addCleanup(self.mock_module_helper.stop)
+        self.addCleanup(self.mock_main.stop)
+
+    def run_module(self, fixture):
+        with patch.object(K8sService, "find") as mock_find_command:
+            mock_find_command.return_value = {
+                "api_found": True,
+                "failed": False,
+                "resources": [],
+            }  # successful execution
+            with self.assertRaises(AnsibleExitJson):
+                kubevirt_vm_info.main()
+            mock_find_command.assert_called_once_with(
+                **fixture,
+            )
+
+    def test_describe_without_args(self):
+        set_module_args({})
+        self.run_module(FIXTURE1)
+
+    def test_describe_with_args(self):
+        set_module_args(
+            {
+                "name": "testvm",
+                "namespace": "default",
+            }
+        )
+        self.run_module(FIXTURE2)