[feature] add basic ansible appliance management

This is not ideal. Ansible has tons of issues when we launch it from
there, and the configuration become tedious.

It might be easier to deploy ansible on the frontend and rerun
everything inside, or to create a python script that deals with ansible
directly.

.gitignore

 **/secure.yaml
+*.retry

README.markdown

@@ -38,3 +38,20 @@ required*
 > ./chi-lease.py create
 > ./chi-lease.py show
 > ./chi-lease.py delete
+
+# Appliance Management
+
+Once a lease is active, you can manage an appliance on it using ansible. First,
+output the required extra variables for ansible.
+
+> ./chi-lease.py ansible-extra-vars <lease_name> <stack_name> <template_file> <chameleon_key> <image> > myextravars
+
+Then call the ansible playbooks.
+
+> ansible-playbook -e @myextravars --connection=local stack-create.yaml
+
+Use can then ssh onto the front node and run your experiments.
+
+To destroy the stack, before deleting the lease:
+
+> ansible-playbook -e @myextravars --connection=local stack-delete.yaml

chi-lease.py

@@ -9,6 +9,13 @@ import os
 import os_client_config
 from blazarclient import client as blazar_client
 import keystoneauth1
+import shade
+
+
+def get_cloud_config(cloud=None):
+    """Retrieve the config in clouds.yaml."""
+    config = os_client_config.OpenStackConfig()
+    return config.get_one(cloud)
 
 
 def get_client(cloud=None):
@@ -94,6 +101,27 @@ def do_list(argv):
         print("No leases.")
 
 
+def do_ansible_extra_vars(argv):
+    """Output a JSON dict with parameters for ansible config."""
+    cloud = get_cloud_config(argv.cloud)
+    client = get_client(argv.cloud)
+    lease_list = client.lease.list()
+    leases = [l for l in lease_list if l['name'] == argv.lease]
+    lease = leases.pop()
+    if leases:
+        print("WARNING: more than one lease with that name, using the first.")
+    reservation = lease['reservations'][0]
+    extra_vars = {'cloud_name': cloud.name,
+                  'stack_name': argv.stack,
+                  'template_file': os.path.abspath(argv.template),
+                  'key_name': argv.key,
+                  'reservation_id': reservation['id'],
+                  'node_count': reservation['min'],
+                  'image': argv.image
+                  }
+    print(json.dumps(extra_vars, indent=4))
+
+
 def main():
     parser = argparse.ArgumentParser(description='Chameleon Lease Helper')
     parser.add_argument('--cloud', default=os.environ.get('OS_CLOUD'),
@@ -126,6 +154,15 @@ def main():
     parser_list = subparsers.add_parser("list", help="List all leases")
     parser_list.set_defaults(func=do_list)
 
+    parser_extra = subparsers.add_parser("ansible-extra-vars",
+                                         help="generate extra-vars file")
+    parser_extra.add_argument("lease", help="Lease name")
+    parser_extra.add_argument("stack", help="Stack name")
+    parser_extra.add_argument("template", help="appliance template")
+    parser_extra.add_argument("key", help="User key name")
+    parser_extra.add_argument("image", help="Image name")
+    parser_extra.set_defaults(func=do_ansible_extra_vars)
+
     args = parser.parse_args()
     if args.debug:
         logger = logging.getLogger('keystoneauth')

stack-create.yaml

+# ansible
+---
+- hosts: localhost
+  tasks:
+    - name: make stack available
+      os_stack:
+        name: "{{ stack_name }}"
+        state: present
+        cloud: "{{ cloud_name }}"
+        template: "{{ template_file }}"
+        parameters:
+          key_name: "{{ key_name }}"
+          reservation_id: "{{ reservation_id }}"
+          node_count: "{{ node_count }}"
+          image: "{{ image }}"

stack-delete.yaml

+# ansible
+---
+- hosts: localhost
+  tasks:
+    - name: make stack unavailable
+      os_stack:
+        name: "{{ stack_name }}"
+        state: absent
+        cloud: "{{ cloud_name }}"