fix missing util funcs

scripts/build-chart

@@ -29,9 +29,15 @@ if [ "$BUILD_TARGET" == "prometheus-federator" ]; then
   base64 -i "build/charts/${CHART}-${CHART_VERSION}.tgz" > "cmd/${BUILD_TARGET}/fs/${CHART}.tgz.base64"
   rm "build/charts/${CHART}-${CHART_VERSION}.tgz"
 elif [ "$BUILD_TARGET" == "helm-project-operator" ]; then
+  # Prepare base chart for build
+  rm -rf build/charts
+  mkdir -p build/charts
+  cp -rf "examples/helm-project-operator/${CHART}" build/charts/
+
+
   # Update the chart placeholders
-  edit-charts "examples/helm-project-operator/${CHART}/Chart.yaml" "${HELM_CHART_VERSION}" "${HELM_IMAGE_TAG}"
-  package-charts "./examples/helm-project-operator/${CHART}" ./build/charts
+  edit-charts "build/charts/${CHART}/Chart.yaml" "${HELM_CHART_VERSION}" "${HELM_IMAGE_TAG}"
+  package-charts "./build/charts/${CHART}" ./build/charts
 
   # Prepare chart for embedding location
   base64 -i "./build/charts/${CHART}-${HELM_CHART_VERSION}.tgz" > "cmd/${BUILD_TARGET}/fs/${CHART}.tgz.base64"

scripts/util-chart

@@ -1,7 +1,23 @@
 #!/usr/bin/env bash
 
+function is_gnu_sed(){
+  sed --version >/dev/null 2>&1
+}
+
+function sed_i_wrapper(){
+  if is_gnu_sed; then
+    $(which sed) "$@"
+  else
+    a=()
+    for b in "$@"; do
+      [[ $b == '-i' ]] && a=("${a[@]}" "$b" "") || a=("${a[@]}" "$b")
+    done
+    $(which sed) "${a[@]}"
+  fi
+}
+
 function edit-charts() {
-    sed -i \
+    sed_i_wrapper -i \
         -e 's/^version:.*/version: '${2}'/' \
         -e 's/^appVersion:.*/appVersion: '${3}'/' \
         "${1}"