Fixes label issues

- #8
- #9

chrisomatic/core/docker.py

@@ -12,7 +12,8 @@
 from enum import Enum
 
 
-_CHRIS_ROLE = {"label": {"org.chrisproject.role=ChRIS ultron backEnd": True}}
+BACKEND_CONTAINER_LABEL = "org.chrisproject.role=ChRIS_ultron_backEnd"
+_CHRIS_ROLE = {"label": {BACKEND_CONTAINER_LABEL: True}}
 
 
 async def find_cube(

chrisomatic/core/superuser.py

@@ -3,15 +3,19 @@
 
 import aiodocker
 from chrisomatic.spec.common import User
-from chrisomatic.core.docker import find_cube
+from chrisomatic.core.docker import find_cube, BACKEND_CONTAINER_LABEL
 
 
 async def create_superuser(docker: Optional[aiodocker.Docker], user: User) -> None:
     if docker is None:
         raise SuperuserCreationError(
             "Cannot create superuser without connection to Docker."
         )
-    cube = await find_cube(docker)
+    if (cube := await find_cube(docker)) is None:
+        raise SuperuserCreationError(
+            f"No container found on host {docker.docker_host} "
+            f"with label {BACKEND_CONTAINER_LABEL}"
+        )
     script = cleandoc(
         f"""
         from django.contrib.auth.models import User

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "chrisomatic"
-version = "0.5.0.a1"
+version = "0.5.0.a2"
 description = "ChRIS backend provisioner with Powerpointlessness"
 authors = ["Jennings Zhang <[email protected]>"]
 license = "MIT"