First run for using an attached resource.

charms/mysql/config.yaml

@@ -1,33 +1,44 @@
 options:
-    mysql_image:
-        type: string
-        description: 'The docker image of mysql to install.'
-        default: 'mysql/mysql-server:5.7'
-    user:
-        type: string
-        description: 'The database user name.'
-        default: 'admin'
-    password:
-        type: string
-        description: 'The database user password.'
-        default: 'password'
-    database:
-        type: string
-        description: 'The database name.'
-        default: 'database'
-    root_password:
-        type: string
-        description: 'The database root password.'
-        default: 'root'
-    mysql_port:
-        type: string
-        description: 'The mysql port'
-        default: '3306'
-    query-cache-type:
-        default: "OFF"
-        type: string
-        description: Query cache is usually a good idea, but can hurt concurrency. Valid values are "OFF", "ON", or "DEMAND". http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html#sysvar_query_cache_type
-    query-cache-size:
-        default: 0
-        type: int
-        description: Override the computed version from dataset-size. Still works if query-cache-type is "OFF" since sessions can override the cache type setting on their own.
+  mysql_image:
+    type: string
+    description: 'The docker image of mysql to install.'
+    default: 'registry.staging.jujucharms.com/veebers/caas-mysql/mysql-image@sha256:eb3aa08c047efcb3e6bfcc3a28b80a2ec8c67b4315712b26679b0b22320f0b4a'
+  resource_username:
+    type: string
+    description: "Username for rego"
+    default: "docker-registry"
+  resource_password:
+    type: string
+    description: "Password for rego"
+    default: "<password from api call goes here>"
+  user:
+    type: string
+    description: 'The database user name.'
+    default: 'admin'
+  password:
+    type: string
+    description: 'The database user password.'
+    default: 'password'
+  database:
+    type: string
+    description: 'The database name.'
+    default: 'database'
+  root_password:
+    type: string
+    description: 'The database root password.'
+    default: 'root'
+  mysql_port:
+    type: string
+    description: 'The mysql port'
+    default: '3306'
+  query-cache-type:
+    default: "OFF"
+    type: string
+    description: "Query cache is usually a good idea, but can hurt concurrency.\
+      \ Valid values are \"OFF\", \"ON\", or \"DEMAND\". http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html#sysvar_query_cache_type"
+  "query-cache-size:
+    default: !!int "0"
+    type: int
+    description: "Override the computed version from dataset-size. Still works if\
+      \ query-cache-type is \"OFF\" since sessions can override the cache type setting\
+      \ on their own."

charms/mysql/metadata.yaml

@@ -15,3 +15,7 @@ provides:
       interface: mysql      
 series:
    - kubernetes
+resources:
+  mysql_image:
+    type: docker
+    description: "Image used for mysql pod."

charms/mysql/reactive/mysql.py

@@ -1,8 +1,17 @@
+import json
+
 from charms.layer.basic import pod_spec_set
 from charms.reactive import when, when_not
 from charms.reactive.flags import set_flag, get_state
-from charmhelpers.core.hookenv import log, metadata, status_set, config,\
-     network_get, relation_id
+from charmhelpers.core.hookenv import (
+    log,
+    metadata,
+    status_set,
+    config,
+    network_get,
+    relation_id,
+    resource_get,
+)
 
 
 @when_not('mysql.configured')
@@ -33,9 +42,27 @@ def make_pod_spec():
     root_password = cfg.get('root_password')
     set_flag('root_password', root_password)
 
+    # Grab the details from resource-get, untested.
+    # mysql_image_details_path = resource_get("mysql_image")
+    # if not mysql_image_details_path:
+    #     raise Exception("unable to retrieve mysql image details")
+
+    # with open(mysql_image_details_path, "rt") as f:
+    #     mysql_image_details = json.load(f)
+
+    # docker_image_path = mysql_image_details('mysql_image')
+    # docker_image_username = mysql_image_details('resource_username')
+    # docker_image_password = mysql_image_details('resource_password')
+
+    docker_image_path = cfg.get('mysql_image')
+    docker_image_username = cfg.get('resource_username')
+    docker_image_password = cfg.get('resource_password')
+
     data = {
         'name': md.get('name'),
-        'image': cfg.get('mysql_image'),
+        'docker_image_path': docker_image_path,
+        'docker_image_username': docker_image_username,
+        'docker_image_password': docker_image_password,
         'port': cfg.get('mysql_port'),
         'user': user,
         'password': password,

charms/mysql/reactive/spec_template.yaml

@@ -1,6 +1,9 @@
 containers:
   - name: %(name)s
-    image: %(image)s
+    imageDetails:
+      imagePath: %(docker_image_path)s
+      username: %(docker_image_username)s
+      password: %(docker_image_password)s
     ports:
     - containerPort: %(port)s
       protocol: TCP