feat: use dedicated helm home

helm-ct.sh

@@ -1,16 +1,46 @@
 #!/bin/bash
 
+# shellcheck disable=SC2034
+
 set -eu -o pipefail
 
 CT_ARGS=("$@")
 
+echo "+ setting a clean helm environment"
+HELM_HOME="$(mktemp -d)"
+
+HELM_CACHE_HOME="$HELM_HOME/cache"
+HELM_CONFIG_HOME="$HELM_HOME/config"
+HELM_DATA_HOME="$HELM_HOME/data"
+
+KUBECONFIG="$(mktemp -d)/kubeconfig"
+touch "$KUBECONFIG" && chmod 600 "$KUBECONFIG"
+
+echo "+ building helm dependencies"
+INITIAL_DIR="$(realpath .)"
+find . -name Chart.yaml -exec dirname {} \; | while read -r chartdir; do
+  echo "+ building dependencies for $chartdir"
+  cd "$chartdir" || exit 1
+  i=0; for url in $(yq '.dependencies' Chart.yaml -o=json | jq -r '.[].repository'); do
+    echo "${url}" | grep -qE '^(https?|git)://' || continue
+    i=$((i+1)); helm repo add repo-${i} "${url}"
+    helm repo update repo-${i}
+  done
+  cd - || exit 1
+done
+cd "$INITIAL_DIR" || exit 1
+
 echo "+ running helm chart testing (ct) linter"
 
 find . -name ct.yaml -exec dirname {} \; | while read -r ctdir; do
   echo "+ running ct lint from $ctdir"
   cd "$ctdir" || exit 1
-  ct lint "${CT_ARGS}"
+  set -x
+  ct lint "${CT_ARGS[@]}"
 done
 
+echo "+ cleaning helm environment"
+rm -rf "$HELM_HOME"
+
 echo "+ helm chart testing (ct) linter completed"
 exit 0