kustomize helm wrapper for downloader plugins

kustomize-helm-plugin-wrapper.sh

#!/bin/sh
# kustomize-helm-plugin-wrapper: force Helm to see the helm plugins even when kustomize sets HELM_*_HOME to temp dirs.
#
# Usage:
#   chmod +x ./kustomize-helm-plugin-wrapper
#   kustomize build --enable-helm --helm-command ./kustomize-helm-plugin-wrapper .
#   # or: kubectl kustomize --enable-helm --helm-command ./kustomize-helm-plugin-wrapper .
#
# Optional:
#   HELM_REAL_BIN=/usr/bin/helm ./kustomize-helm-plugin-wrapper version

set -eu

# Avoid recursion if someone names this script "helm"
REAL_HELM="${HEM_REAL_BIN:-${HELM_REAL_BIN:-}}"
if [ -z "${REAL_HELM:-}" ]; then
  REAL_HELM="$(command -v helm || true)"
fi

if [ -z "${REAL_HELM:-}" ] || [ ! -x "${REAL_HELM:-/nonexistent}" ]; then
  echo "kustomize-helm-plugin-wrapper: could not find real 'helm' binary. Set HELM_REAL_BIN=/path/to/helm" >&2
  exit 127
fi

# If HELM_PLUGINS is already set, honor it.
if [ -z "${HELM_PLUGINS:-}" ]; then
  # Try common plugin locations (Linux/macOS; root and non-root).
  for d in \
    "$HOME/.local/share/helm/plugins" \
    "$HOME/.helm/plugins" \
    "/root/.local/share/helm/plugins" \
    "/usr/local/share/helm/plugins" \
    "/usr/share/helm/plugins"
  do
    if [ -d "$d" ]; then
      HELM_PLUGINS="$d"
      break
    fi
  done
fi

if [ -z "${HELM_PLUGINS:-}" ] || [ ! -d "${HELM_PLUGINS}" ]; then
  echo "kustomize-helm-plugin-wrapper: HELM_PLUGINS is not set and no default plugin dir exists." >&2
  echo "kustomize-helm-plugin-wrapper: set HELM_PLUGINS to the directory containing your Helm plugins." >&2
  echo "kustomize-helm-plugin-wrapper: example: export HELM_PLUGINS=\$HOME/.local/share/helm/plugins" >&2
  exit 1
fi

# Export so helm can find plugins regardless of HELM_DATA_HOME/HELM_CONFIG_HOME set by kustomize.
export HELM_PLUGINS

exec "$REAL_HELM" "$@"