Add initial docker-image support (#10)

Co-authored-by: reivilibre <38398653+reivilibre@users.noreply.github.com>

scone/default/recipes/docker.py

@@ -1,5 +1,6 @@
 from scone.default.utensils.docker_utensils import (
     DockerContainerRun,
+    DockerImagePull,
     DockerVolumeCreate,
     DockerNetworkCreate,
 )
@@ -24,6 +25,22 @@ class DockerContainer(Recipe):
         )
 
 
+class DockerImage(Recipe):
+    _NAME = "docker-image"
+
+    def __init__(self, recipe_context: RecipeContext, args: dict, head):
+        super().__init__(recipe_context, args, head)
+
+        self.repository = check_type(args.get("repository"), str)
+        self.tag = check_type(args.get("tag"), str)
+        
+    async def cook(self, kitchen: Kitchen) -> None:
+        kitchen.get_dependency_tracker()
+        await kitchen.ut1areq(
+            DockerImagePull(self.repository, self.tag), DockerImagePull.Result
+        )
+
+
 class DockerVolume(Recipe):
     _NAME = "docker-volume"
     
@@ -65,4 +82,3 @@ class DockerNetwork(Recipe):
             ),
             DockerNetworkCreate.Result,
         )
-        

scone/default/utensils/docker_utensils.py

@@ -44,6 +44,26 @@ class DockerContainerRun(Utensil):
         await channel.send(DockerContainerRun.Result(name=container.name))
 
 
+@attr.s(auto_attribs=True)
+class DockerImagePull(Utensil):
+    repository: str
+    tag: str
+
+    @attr.s(auto_attribs=True)
+    class Result:
+        id: str
+
+    async def execute(self, channel: Channel, worktop: Worktop):
+        try:
+            image = _docker_client().images.pull(self.repository, self.tag)
+        except docker.errors.APIError:
+            # the docker server returned an error
+            await channel.send(None)
+            return
+
+        await channel.send(DockerImagePull.Result(id=image.id))
+
+
 @attr.s(auto_attribs=True)
 class DockerVolumeCreate(Utensil):
     name: str