add dependency scripts

go.mod

@@ -360,7 +360,6 @@ replace (
 	golang.org/x/text => golang.org/x/text v0.3.0
 	golang.org/x/time => golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	golang.org/x/tools => golang.org/x/tools v0.0.0-20190710153321-831012c29e42
-	golang.org/x/tools/gopls => golang.org/x/tools/gopls v0.1.3
 	google.golang.org/api => google.golang.org/api v0.3.1
 	google.golang.org/appengine => google.golang.org/appengine v1.5.0
 	google.golang.org/genproto => google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7

hack/lint-dependencies.sh

+#!/usr/bin/env bash
+
+# Copyright 2019 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 -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+# Explicitly opt into go modules, even though we're inside a GOPATH directory
+export GO111MODULE=on
+# Explicitly clear GOFLAGS, since GOFLAGS=-mod=vendor breaks dependency resolution while rebuilding vendor
+export GOFLAGS=
+# Detect problematic GOPROXY settings that prevent lookup of dependencies
+if [[ "${GOPROXY:-}" == "off" ]]; then
+  kube::log::error "Cannot run with \$GOPROXY=off"
+  exit 1
+fi
+
+kube::golang::verify_go_version
+kube::util::require-jq
+
+case "${1:-}" in
+"--all")
+  echo "Checking all dependencies"
+  filter=''
+  ;;
+"-a")
+  echo "Checking all dependencies"
+  filter=''
+  ;;
+"")
+  # by default, skip checking golang.org/x/... dependencies... we pin to levels that match our go version for those
+  echo "Skipping golang.org/x/... dependencies, pass --all to include"
+  filter='select(.Path | startswith("golang.org/x/") | not) |'
+  ;;
+*)
+  kube::log::error "Unrecognized arg: ${1}"
+  exit 1
+  ;;
+esac
+
+outdated=$(go list -m -json all | jq -r "
+  select(.Replace.Version != null) |
+  select(.Version != .Replace.Version) |
+  ${filter}
+  select(.Path) |
+  \"\(.Path)
+    pinned:    \(.Replace.Version)
+    preferred: \(.Version)
+    hack/pin-dependency.sh \(.Path) \(.Version)\"
+")
+if [[ -n "${outdated}" ]]; then
+  echo "These modules are pinned to versions different than the minimal preferred version."
+  echo "That means that without replace directives, a different version would be selected,"
+  echo "which breaks consumers of our published modules."
+  echo "1. Use hack/pin-dependency.sh to switch to the preferred version for each module"
+  echo "2. Run hack/update-vendor.sh to rebuild the vendor directory"
+  echo "3. Run hack/lint-dependencies.sh to verify no additional changes are required"
+  echo ""
+  echo "${outdated}"
+fi
+
+unused=$(comm -23 \
+  <(go mod edit -json | jq -r '.Replace[] | select(.New.Version != null) | .Old.Path' | sort) \
+  <(go list -m -json all | jq -r .Path | sort))
+if [[ -n "${unused}" ]]; then
+  echo ""
+  echo "Use the given commands to remove pinned module versions that aren't actually used:"
+  echo "${unused}" | xargs -L 1 echo 'GO111MODULE=on go mod edit -dropreplace'
+fi
+
+if [[ -n "${unused}${outdated}" ]]; then
+  exit 1
+fi
+
+echo "All pinned versions of checked dependencies match their preferred version."
+exit 0