Created gce_snapshot module (#20057)

* Added support for a gce_snapshot module for managing snapshots in the Google Cloud Platform

* Fixed using sys.exit in favor of fail_json. Followed the pattern in gce_pd

* Fixed using sys.exit in favor of fail_json. Followed the pattern in gce_pd

* Fixed an issue when dealing with multiple disks. Added a bit more documentation explaining the disks argument

* Corrected a typo in the multi-disk snapshot example

* Updated module to return list of changed snapshots instead of just a message. Added a RETURN block

lib/ansible/modules/cloud/google/gce_snapshot.py

@@ -0,0 +1,227 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.gce import gce_connect
+
+DOCUMENTATION = '''
+---
+module: gce_snapshot
+version_added: "2.3"
+short_description: Create or destroy snapshots for GCE storage volumes
+description:
+  - Manages snapshots for GCE instances. This module manages snapshots for
+    the storage volumes of a GCE compute instance. If there are multiple
+    volumes, each snapshot will be prepended with the disk name
+options:
+  instance_name:
+    description:
+      - The GCE instance to snapshot
+    required: True
+  snapshot_name:
+    description:
+      - The name of the snapshot to manage
+  disks:
+    description:
+      - A list of disks to create snapshots for. If none is provided,
+        all of the volumes will be snapshotted
+    default: all
+    required: False
+  state:
+    description:
+      - Whether a snapshot should be C(present) or C(absent)
+    required: false
+    default: present
+    choices: [present, absent]
+  service_account_email:
+    description:
+      - GCP service account email for the project where the instance resides
+    required: true
+  credentials_file:
+    description:
+      - The path to the credentials file associated with the service account
+    required: true
+  project_id:
+    description:
+      - The GCP project ID to use
+    required: true
+requirements:
+    - "python >= 2.6"
+    - "apache-libcloud >= 0.19.0"
+author: Rob Wagner (@robwagner33)
+'''
+
+EXAMPLES = '''
+- name: Create gce snapshot
+  gce_snapshot:
+    instance_name: example-instance
+    snapshot_name: example-snapshot
+    state: present
+    service_account_email: project_name@appspot.gserviceaccount.com
+    credentials_file: /path/to/credentials
+    project_id: project_name
+  delegate_to: localhost
+
+- name: Delete gce snapshot
+  gce_snapshot:
+    instance_name: example-instance
+    snapshot_name: example-snapshot
+    state: absent
+    service_account_email: project_name@appspot.gserviceaccount.com
+    credentials_file: /path/to/credentials
+    project_id: project_name
+  delegate_to: localhost
+
+# This example creates snapshots for only two of the available disks as
+# disk0-example-snapshot and disk1-example-snapshot
+- name: Create snapshots of specific disks
+  gce_snapshot:
+    instance_name: example-instance
+    snapshot_name: example-snapshot
+    state: present
+    disks:
+      - disk0
+      - disk1
+    service_account_email: project_name@appspot.gserviceaccount.com
+    credentials_file: /path/to/credentials
+    project_id: project_name
+  delegate_to: localhost
+'''
+
+RETURN = '''
+snapshots_created:
+    description: List of newly created snapshots
+    returned: When snapshots are created
+    type: list
+    sample: "[disk0-example-snapshot, disk1-example-snapshot]"
+
+snapshots_deleted:
+    description: List of destroyed snapshots
+    returned: When snapshots are deleted
+    type: list
+    sample: "[disk0-example-snapshot, disk1-example-snapshot]"
+
+snapshots_existing:
+    description: List of snapshots that already existed (no-op)
+    returned: When snapshots were already present
+    type: list
+    sample: "[disk0-example-snapshot, disk1-example-snapshot]"
+
+snapshots_absent:
+    description: List of snapshots that were already absent (no-op)
+    returned: When snapshots were already absent
+    type: list
+    sample: "[disk0-example-snapshot, disk1-example-snapshot]"
+'''
+
+try:
+    from libcloud.compute.types import Provider
+    _ = Provider.GCE
+    HAS_LIBCLOUD = True
+except ImportError:
+    HAS_LIBCLOUD = False
+
+
+def find_snapshot(volume, name):
+    '''
+    Check if there is a snapshot already created with the given name for
+    the passed in volume.
+
+    Args:
+        volume: A gce StorageVolume object to manage
+        name: The name of the snapshot to look for
+
+    Returns:
+        The VolumeSnapshot object if one is found
+    '''
+    found_snapshot = None
+    snapshots = volume.list_snapshots()
+    for snapshot in snapshots:
+        if name == snapshot.name:
+            found_snapshot = snapshot
+    return found_snapshot
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            instance_name=dict(required=True),
+            snapshot_name=dict(required=True),
+            state=dict(choices=['present', 'absent'], default='present'),
+            disks=dict(default=None, type='list'),
+            service_account_email=dict(type='str'),
+            credentials_file=dict(type='path'),
+            project_id=dict(type='str')
+        )
+    )
+
+    if not HAS_LIBCLOUD:
+        module.fail_json(msg='libcloud with GCE support (0.19.0+) is required for this module')
+
+    gce = gce_connect(module)
+
+    instance_name = module.params.get('instance_name')
+    snapshot_name = module.params.get('snapshot_name')
+    disks = module.params.get('disks')
+    state = module.params.get('state')
+
+    json_output = dict(
+        changed=False,
+        snapshots_created=[],
+        snapshots_deleted=[],
+        snapshots_existing=[],
+        snapshots_absent=[]
+    )
+
+    snapshot = None
+
+    instance = gce.ex_get_node(instance_name, 'all')
+    instance_disks = instance.extra['disks']
+
+    for instance_disk in instance_disks:
+        device_name = instance_disk['deviceName']
+        if disks is None or device_name in disks:
+            volume_obj = gce.ex_get_volume(device_name)
+
+            # If we have more than one disk to snapshot, prepend the disk name
+            if len(instance_disks) > 1:
+                snapshot_name = device_name + "-" + snapshot_name
+
+            snapshot = find_snapshot(volume_obj, snapshot_name)
+
+            if snapshot and state == 'present':
+                json_output['snapshots_existing'].append(snapshot_name)
+
+            elif snapshot and state == 'absent':
+                snapshot.destroy()
+                json_output['changed'] = True
+                json_output['snapshots_deleted'].append(snapshot_name)
+
+            elif not snapshot and state == 'present':
+                volume_obj.snapshot(snapshot_name)
+                json_output['changed'] = True
+                json_output['snapshots_created'].append(snapshot_name)
+
+            elif not snapshot and state == 'absent':
+                json_output['snapshots_absent'].append(snapshot_name)
+
+    module.exit_json(**json_output)
+
+
+if __name__ == '__main__':
+    main()