Repository: ansible/ansible

Issue:
ec2_lc does not correctly support no_device

##### ISSUE TYPE
 - Bug Report

##### COMPONENT NAME
ec2_lc

##### ANSIBLE VERSION
```
ansible 2.4.3.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2]

```

##### CONFIGURATION
None

##### OS / ENVIRONMENT
Linux

##### SUMMARY
The `no_device` attribute defined for a volume is getting ignored, and is not correctly represented in the generated `BlockDeviceMappings` for the created launch configuration.

##### STEPS TO REPRODUCE

<!--- Paste example playbooks or commands between quotes below -->
```yaml
    - name: Create Launch Configurations
      ec2_lc:
        name: "{{ cluster_name }}-lc-{{ item }}"
        region: "{{ ec2_region }}"
        key_name: "{{ key_name }}"
        security_groups:
          - "{{ ec2_group.group_id }}"
        instance_type: "{{ ec2_instance_type }}"
        image_id: "{{ ec2_image }}"
        instance_profile_name: "{{marklogic_role_profile_arn}}"
        volumes:
          - device_name: /dev/sdf
            no_device: true
```

<!--- You can also paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
The generated launch configuration would ignore the /dev/sdf device that is included in the AMI image.

##### ACTUAL RESULTS
The /dev/sdf device is not ignored and is mounted when the instance is created.



Discussion:

Resolving patch:
diff --git a/lib/ansible/modules/cloud/amazon/ec2_lc.py b/lib/ansible/modules/cloud/amazon/ec2_lc.py
--- a/lib/ansible/modules/cloud/amazon/ec2_lc.py
+++ b/lib/ansible/modules/cloud/amazon/ec2_lc.py
@@ -172,6 +172,17 @@
       iops: 3000
       delete_on_termination: true
 
+# create a launch configuration to omit the /dev/sdf EBS device that is included in the AMI image
+
+- ec2_lc:
+    name: special
+    image_id: ami-XXX
+    key_name: default
+    security_groups: ['group', 'group2' ]
+    instance_type: t1.micro
+    volumes:
+    - device_name: /dev/sdf
+      no_device: true
 '''
 
 RETURN = '''
@@ -396,7 +407,7 @@ def create_block_device_meta(module, volume):
     if 'device_type' in volume:
         volume['volume_type'] = volume.pop('device_type')
 
-    if 'snapshot' not in volume and 'ephemeral' not in volume:
+    if 'snapshot' not in volume and 'ephemeral' not in volume and 'no_device' not in volume:
         if 'volume_size' not in volume:
             module.fail_json(msg='Size must be specified when creating a new volume or modifying the root volume')
     if 'snapshot' in volume:
@@ -414,7 +425,7 @@ def create_block_device_meta(module, volume):
     if 'device_name' in volume:
         return_object['DeviceName'] = volume.get('device_name')
 
-    if 'no_device' is volume:
+    if 'no_device' in volume:
         return_object['NoDevice'] = volume.get('no_device')
 
     if any(key in volume for key in ['snapshot', 'volume_size', 'volume_type', 'delete_on_termination', 'ips', 'encrypted']):


Test patch: