Error out if helm version is less than v4

Author: yuvipanda

deployer/infra_components/cluster.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 import json
 import os
 import subprocess
@@ -72,6 +73,11 @@ def auth(self, silent=False):
             raise ValueError(f"Provider {self.spec['provider']} not supported")
 
     def deploy_support(self, cert_manager_version, debug, dry_run):
+        helm_version = subprocess.check_output(["helm", "version", "--short"]).decode().strip()
+        if not helm_version.startswith("v4."):
+            print(f"Minimum required version of helm is v4. Found version {helm_version}", file=sys.stderr)
+            print(f"Upgrade your version of helm and try again")
+            sys.exit(1)
         cert_manager_url = "https://charts.jetstack.io"
 
         print_colour("Provisioning cert-manager...")

deployer/infra_components/hub.py

@@ -4,6 +4,7 @@
 import subprocess
 from contextlib import ExitStack
 from pathlib import Path
+import sys
 from typing import TYPE_CHECKING
 
 from ruamel.yaml import YAML
@@ -95,6 +96,12 @@ def deploy(self, chart_dir, dask_gateway_version, debug, dry_run):
         """
         Deploy this hub
         """
+        # Make sure we're on helm v4
+        helm_version = subprocess.check_output(["helm", "version", "--short"]).decode().strip()
+        if not helm_version.startswith("v4."):
+            print(f"Minimum required version of helm is v4. Found version {helm_version}", file=sys.stderr)
+            print(f"Upgrade your version of helm and try again")
+            sys.exit(1)
         # Support overriding domain configuration in the loaded cluster.yaml via
         # a cluster.yaml specified enc-<something>.secret.yaml file that only
         # includes the domain configuration of a typical cluster.yaml file.