Add hack/update-deps.sh (#193)

hack/update-deps.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# 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 -o errexit
+set -o nounset
+set -o pipefail
+
+PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+pushd ${PROJECT_ROOT}
+trap popd EXIT
+
+go mod tidy
+go mod vendor
+
+# Delete all vendored broken symlinks.
+# From https://stackoverflow.com/questions/22097130/delete-all-broken-symbolic-links-with-a-line
+find vendor/ -type l -exec sh -c 'for x; do [ -e "$x" ] || rm "$x"; done' _ {} +