block job template launches when an inventory is being deleted

see: #4382

awx/api/serializers.py

@@ -3127,6 +3127,9 @@ class JobLaunchSerializer(BaseSerializer):
             if not (attrs.get(field, False) and obj._ask_for_vars_dict().get(field, False)):
                 errors[field] = _("Job Template '%s' is missing or undefined.") % field
 
+        if obj.inventory and obj.inventory.pending_deletion is True:
+            errors['inventory'] = _("The inventory associated with this Job Template is being deleted.")
+
         if (not obj.ask_credential_on_launch) or (not attrs.get('credential', None)):
             credential = obj.credential
         else:

awx/main/tests/functional/api/test_inventory.py

@@ -40,6 +40,28 @@ def test_edit_inventory(put, inventory, alice, role_field, expected_status_code)
     put(reverse('api:inventory_detail', kwargs={'pk': inventory.id}), data, alice, expect=expected_status_code)
 
 
+@pytest.mark.django_db
+def test_async_inventory_deletion(delete, get, inventory, alice):
+    inventory.admin_role.members.add(alice)
+    resp = delete(reverse('api:inventory_detail', kwargs={'pk': inventory.id}), alice)
+    assert resp.status_code == 202
+
+    resp = get(reverse('api:inventory_detail', kwargs={'pk': inventory.id}), alice)
+    assert resp.status_code == 200
+    assert resp.data.get('pending_deletion') is True
+
+
+@pytest.mark.django_db
+def test_async_inventory_duplicate_deletion_prevention(delete, get, inventory, alice):
+    inventory.admin_role.members.add(alice)
+    resp = delete(reverse('api:inventory_detail', kwargs={'pk': inventory.id}), alice)
+    assert resp.status_code == 202
+
+    resp = delete(reverse('api:inventory_detail', kwargs={'pk': inventory.id}), alice)
+    assert resp.status_code == 400
+    assert resp.data['error'] == 'Inventory is already being deleted.'
+
+
 @pytest.mark.parametrize('order_by', ('script', '-script', 'script,pk', '-script,pk'))
 @pytest.mark.django_db
 def test_list_cannot_order_by_unsearchable_field(get, organization, alice, order_by):

awx/main/tests/functional/api/test_job_template.py

@@ -472,6 +472,23 @@ def test_scan_jt_surveys(inventory):
     assert "survey_enabled" in serializer.errors
 
 
+@pytest.mark.django_db
+def test_launch_with_pending_deletion_inventory(get, post, organization_factory,
+                                                job_template_factory, machine_credential,
+                                                credential, net_credential):
+    objs = organization_factory("org", superusers=['admin'])
+    jt = job_template_factory("jt", organization=objs.organization, credential='c',
+                              inventory='test_inv', project='test_proj').job_template
+    jt.inventory.pending_deletion = True
+    jt.inventory.save()
+
+    resp = post(
+        reverse('api:job_template_launch', kwargs={'pk': jt.pk}),
+        objs.superusers.admin, expect=400
+    )
+    assert resp.data['inventory'] == ['The inventory associated with this Job Template is being deleted.']
+
+
 @pytest.mark.django_db
 def test_launch_with_extra_credentials(get, post, organization_factory,
                                        job_template_factory, machine_credential,