test: add helm repo install check

chmod

fix index check

hack/verify-all.sh

@@ -24,4 +24,5 @@ ${PKG_ROOT}/hack/verify-yamllint.sh
 ${PKG_ROOT}/hack/verify-boilerplate.sh
 ${PKG_ROOT}/hack/verify-helm-chart-files.sh
 ${PKG_ROOT}/hack/verify-helm-chart.sh
+${PKG_ROOT}/hack/verify-helm-chart-index.sh
 ${PKG_ROOT}/hack/verify-gomod.sh

hack/verify-helm-chart-index.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+# Copyright 2020 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+
+readonly PKG_ROOT="$(git rev-parse --show-toplevel)"
+
+INDEX=${PKG_ROOT}/charts/index.yaml
+
+function check_url() {  
+    url=$1
+    result=$(curl -I -m 5 -s -w "%{http_code}\n" -o /dev/null $1)
+    if [ $result -ne 200 ]
+    then
+        echo "warning: $1 is invalid"
+        local=${PKG_ROOT}${url#*master}
+        echo "check whether $local exists"
+        if [ -f "$local" ]
+        then
+            echo "$local exists"
+        else
+            echo "$local does not exist"
+            exit 1
+        fi
+    fi
+}
+
+function check_yaml() {
+    grep http $INDEX | while read LINE
+    do
+        url=$(echo "$LINE" | awk -F " " '{print $2}')
+        check_url $url
+    done
+}
+
+echo "begin to verify all URLs in $INDEX ..."
+check_yaml
+echo "all URLs in $INDEX are valid"