Support hubless environment in ramenctl

If environment does not have a hub:

- `ramenctl deploy` skips hub deployment
- `ramenctl config` installs the s3 secret and
  ramen-dr-cluster-operator-config map on the dr clusters.
- `ramenctl unconfig` skips the hub configuration and delete the s3
  secrets from the dr clusters.
- `ramenctl undeploy` skips the hub deployment

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

ramenctl/ramenctl/config.py

@@ -21,54 +21,77 @@ def register(commands):
 def run(args):
     env = command.env_info(args)
 
+    if env["hub"]:
+        wait_for_ramen_hub_operator(env["hub"], args)
+        apply_s3_secret(env["hub"])
+        yaml = generate_config_map("ramen-hub-operator-config", env["clusters"])
+        apply_ramen_config_map(env["hub"], yaml)
+        apply_dr_resources(env["hub"], env["topology"])
+        wait_for_dr_clusters(env["hub"], env["clusters"], args)
+        wait_for_dr_policy(env["hub"], args)
+    else:
+        yaml = generate_config_map("ramen-dr-cluster-operator-config", env["clusters"])
+        for cluster in env["clusters"]:
+            apply_s3_secret(cluster)
+            apply_ramen_config_map(cluster, yaml)
+
+
+def wait_for_ramen_hub_operator(hub, args):
     command.info("Waiting until ramen-hub-operator is rolled out")
     kubectl.rollout(
         "status",
         "deploy/ramen-hub-operator",
         f"--namespace={args.ramen_namespace}",
         "--timeout=180s",
-        context=env["hub"],
+        context=hub,
         log=command.debug,
     )
 
-    command.info("Creating s3 secret in ramen hub namespace")
+
+def apply_s3_secret(cluster):
+    command.info("Creating s3 secret in cluster '%s'", cluster)
     kubectl.apply(
         "--filename",
         command.resource("ramen-s3-secret.yaml"),
-        context=env["hub"],
+        context=cluster,
         log=command.debug,
     )
 
-    command.info("Updating ramen config map")
+
+def generate_config_map(name, clusters):
     template = drenv.template(command.resource("configmap.yaml"))
-    yaml = template.substitute(
+    return template.substitute(
+        name=name,
         auto_deploy="true",
-        minio_url_dr1=minio.service_url(env["clusters"][0]),
-        minio_url_dr2=minio.service_url(env["clusters"][1]),
-    )
-    kubectl.apply(
-        "--filename=-",
-        input=yaml,
-        context=env["hub"],
-        log=command.debug,
+        minio_url_dr1=minio.service_url(clusters[0]),
+        minio_url_dr2=minio.service_url(clusters[1]),
     )
 
-    command.info("Creating DRClusters and DRPolicy for %s", env["topology"])
+
+def apply_ramen_config_map(cluster, yaml):
+    command.info("Updating ramen config map in cluster '%s'", cluster)
+    kubectl.apply("--filename=-", input=yaml, context=cluster, log=command.debug)
+
+
+def apply_dr_resources(hub, topology):
+    command.info("Creating DRClusters and DRPolicy for '%s'", topology)
     kubectl.apply(
         "--kustomize",
-        command.resource(env["topology"]),
-        context=env["hub"],
+        command.resource(topology),
+        context=hub,
         log=command.debug,
     )
 
+
+def wait_for_dr_clusters(hub, clusters, args):
     command.info("Waiting until DRClusters report phase")
-    for name in env["clusters"]:
+    for name in clusters:
         drenv.wait_for(
             f"drcluster/{name}",
             output="jsonpath={.status.phase}",
             namespace=args.ramen_namespace,
             timeout=180,
-            profile=env["hub"],
+            profile=hub,
             log=command.debug,
         )
 
@@ -78,15 +101,17 @@ def run(args):
         "--all",
         "--for=jsonpath={.status.phase}=Available",
         f"--namespace={args.ramen_namespace}",
-        context=env["hub"],
+        context=hub,
         log=command.debug,
     )
 
+
+def wait_for_dr_policy(hub, args):
     command.info("Waiting until DRPolicy is validated")
     kubectl.wait(
         "drpolicy/dr-policy",
         "--for=condition=Validated",
         f"--namespace={args.ramen_namespace}",
-        context=env["hub"],
+        context=hub,
         log=command.debug,
     )

ramenctl/ramenctl/deploy.py

@@ -37,13 +37,17 @@ def load_image(cluster):
             command.info("Loading image in cluster '%s'", cluster)
             command.watch("minikube", "--profile", cluster, "image", "load", tar)
 
-        clusters = [env["hub"]] + env["clusters"]
+        all_clusters = env["clusters"][:]
+        if env["hub"]:
+            all_clusters.append(env["hub"])
+
         with concurrent.futures.ThreadPoolExecutor() as executor:
-            list(executor.map(load_image, clusters))
+            list(executor.map(load_image, all_clusters))
 
-    command.info("Deploying ramen operator in cluster '%s'", env["hub"])
-    command.watch("kubectl", "config", "use-context", env["hub"])
-    command.watch("make", "-C", args.source_dir, "deploy-hub")
+    if env["hub"]:
+        command.info("Deploying ramen operator in cluster '%s'", env["hub"])
+        command.watch("kubectl", "config", "use-context", env["hub"])
+        command.watch("make", "-C", args.source_dir, "deploy-hub")
 
     for cluster in env["clusters"]:
         command.info("Deploying ramen operator in cluster '%s'", cluster)

ramenctl/ramenctl/resources/configmap.yaml

@@ -4,7 +4,7 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: ramen-hub-operator-config
+  name: $name
   namespace: ramen-system
 data:
   ramen_manager_config.yaml: |

ramenctl/ramenctl/unconfig.py

@@ -19,22 +19,32 @@ def register(commands):
 def run(args):
     env = command.env_info(args)
 
-    command.info("Deleting DRClusters and DRPolicy")
+    # Note: We keep the ramen config map since we do not own it.
+    if env["hub"]:
+        delete_dr_resources(env["hub"], env["topology"])
+        delete_s3_secret(env["hub"])
+    else:
+        for cluster in env["clusters"]:
+            delete_s3_secret(cluster)
+
+
+def delete_dr_resources(hub, topology):
+    command.info("Deleting DRClusters and DRPolicy for '%s'", topology)
     kubectl.delete(
         "--kustomize",
-        command.resource(env["topology"]),
+        command.resource(topology),
         "--ignore-not-found",
-        context=env["hub"],
+        context=hub,
         log=command.debug,
     )
 
-    # We keep the ramen config map since we do not own it.
 
-    command.info("Deleting s3 secret in ramen hub namespace")
+def delete_s3_secret(cluster):
+    command.info("Deleting s3 secret in cluster '%s'", cluster)
     kubectl.delete(
         "--filename",
         command.resource("ramen-s3-secret.yaml"),
         "--ignore-not-found",
-        context=env["hub"],
+        context=cluster,
         log=command.debug,
     )

ramenctl/ramenctl/undeploy.py

@@ -22,6 +22,7 @@ def run(args):
         command.watch("kubectl", "config", "use-context", cluster)
         command.watch("make", "-C", args.source_dir, "undeploy-dr-cluster")
 
-    command.info("Undeploying ramen operator in cluster '%s'", env["hub"])
-    command.watch("kubectl", "config", "use-context", env["hub"])
-    command.watch("make", "-C", args.source_dir, "undeploy-hub")
+    if env["hub"]:
+        command.info("Undeploying ramen operator in cluster '%s'", env["hub"])
+        command.watch("kubectl", "config", "use-context", env["hub"])
+        command.watch("make", "-C", args.source_dir, "undeploy-hub")