Adding ability to specify image for single commands

DLS version was bumped to 0.5.0

Change-Id: I82e910f11c1033ff24d48087329c46691600699b

doc/source/dsl.rst

@@ -38,6 +38,7 @@ Application definition template
                         - some-service
                         - some-other-service
                     type: single
+                    image: some_image
                     command: /tmp/bootstrap.sh
                     files:
                         - bootstrap.sh
@@ -263,9 +264,15 @@ command
    * - name
      - Name of the command. Required only for `pre` and `post` with type
        `single`.
-     - --
+     -
      - string
-     - --
+     -
+   * - image
+     - Image that will be used to run the command. Can be used only for `pre`
+       and `post` with type `single`.
+     - false
+     - string
+     - same as for daemon
    * - command
      - --
      - true

fuel_ccp/__init__.py

@@ -17,4 +17,4 @@ import pbr.version
 
 version_info = pbr.version.VersionInfo("fuel_ccp")
 __version__ = version_info.version_string()
-dsl_version = "0.4.0"
+dsl_version = "0.5.0"

fuel_ccp/templates.py

@@ -166,7 +166,7 @@ def serialize_daemon_container_spec(container):
 def serialize_job_container_spec(container, job):
     return {
         "name": job["name"],
-        "image": images.image_spec(container["image"]),
+        "image": images.image_spec(job.get('image') or container["image"]),
         "imagePullPolicy": CONF.kubernetes.image_pull_policy,
         "command": _get_start_cmd(job["name"]),
         "volumeMounts": serialize_volume_mounts(container, job),

fuel_ccp/validation/service.py

@@ -54,6 +54,7 @@ LOCAL_COMMAND_SCHEMA = {
 SINGLE_COMMAND_SCHEMA = copy.deepcopy(LOCAL_COMMAND_SCHEMA)
 SINGLE_COMMAND_SCHEMA["required"] = ["name", "command", "type"]
 SINGLE_COMMAND_SCHEMA["properties"]["type"]["enum"] = ["single"]
+SINGLE_COMMAND_SCHEMA["properties"]["image"] = NOT_EMPTY_STRING_SCHEMA
 
 COMMAND_SCHEMA = {
     "type": "object",