#!/usr/bin/env bash

# Copyright 2018 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 mutable global feature gate is invocated correctly
# in `*_test.go` files.
# Usage: `hack/verify-test-featuregates.sh`.

set -o errexit
set -o nounset
set -o pipefail

KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
source "${KUBE_ROOT}/hack/lib/init.sh"

cd "${KUBE_ROOT}"

rc=0

# find test files accessing the mutable global feature gate or interface
direct_sets=$(git grep MutableFeatureGate -- '*_test.go') || true
if [[ -n "${direct_sets}" ]]; then
  echo "Test files may not access mutable global feature gates directly:" >&2
  echo "${direct_sets}" >&2
  echo >&2
  echo "Use this invocation instead:" >&2
  echo "  featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.<FeatureName>, <value>)" >&2
  echo >&2
  rc=1
fi

export LC_ALL=C
# ensure all generic features are added in alphabetic order
lines=$(git grep 'genericfeatures[.].*:' -- pkg/features/kube_features.go)
sorted_lines=$(echo "$lines" | sort)
if [[ "$lines" != "$sorted_lines" ]]; then
  echo "Generic features in pkg/features/kube_features.go not sorted" >&2
  echo >&2
  echo "Expected:" >&2
  echo "$sorted_lines" >&2
  echo >&2
  echo "Got:" >&2
  echo "$lines" >&2
  rc=1
fi

exit $rc
