Added update and verify scripts for automated mock generation

hack/verify-mocks.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+
+# Copyright 2021 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.
+
+# This script checks whether updating of Mock files generated from Interfaces
+# is needed or not. We should run `hack/update-mocks.sh` 
+# if Mock files are out of date.
+# Usage: `hack/verify-mocks.sh`.
+
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+export KUBE_ROOT
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+# Explicitly opt into go modules, even though we're inside a GOPATH directory
+export GO111MODULE=on
+
+_tmp="${KUBE_ROOT}/_tmp"
+mkdir -p "${_tmp}"
+
+"${KUBE_ROOT}/hack/update-mocks.sh"
+
+# If there are untracked generated mock files which needed to be committed
+if git_status=$(git status --porcelain --untracked=normal 2>/dev/null) && [[ -n "${git_status}" ]]; then
+  echo "!!! You may have untracked mock files."
+fi
+
+# get the changed mock files
+files=$(git diff --name-only)
+
+# copy the changed files to the _tmp directory for later comparison
+mock_files=()
+for file in $files; do
+  if [ "$file" == "hack/verify-mocks.sh" ]; then
+    continue
+  fi
+
+  # create the directory in _tmp
+  mkdir -p "$_tmp/""$(dirname "$file")"
+  cp "$file" "$_tmp/""$file"
+  mock_files+=("$file")
+
+  # reset the current file
+  git checkout "$file"
+done
+
+echo "diffing process started for ${#mock_files[@]} files"
+ret=0
+for file in "${mock_files[@]}"; do
+  diff -Naupr -B \
+    -I '^/\*' \
+    -I 'Copyright The Kubernetes Authors.' \
+    -I 'Licensed under the Apache License, Version 2.0 (the "License");' \
+    -I 'you may not use this file except in compliance with the License.' \
+    -I 'You may obtain a copy of the License at' \
+    -I 'http://www.apache.org/licenses/LICENSE-2.0' \
+    -I 'Unless required by applicable law or agreed to in writing, software' \
+    -I 'distributed under the License is distributed on an "AS IS" BASIS,' \
+    -I 'WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.' \
+    -I 'See the License for the specific language governing permissions and' \
+    -I 'limitations under the License.' \
+    -I '^\*/' \
+    "$file" "$_tmp/""$file" || ret=$?
+
+  if [[ $ret -ne 0 ]]; then
+    echo "Mock files are out of date. Please run hack/update-mocks.sh" >&2
+    exit 1
+  fi
+done
+echo "up to date"