Script to ease pinning modules to kustomize api

hack/pinUnpin.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+# Copyright 2019 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+#
+# In general, pin modules to a specific version of the
+# kustomize API before a release of that module, and
+# unpin the module after the module release so that
+# development proceeds against the API's HEAD.
+#
+# E.g. for the kustomize CLI module, do this before
+# releasing the CLI:
+#
+#   ./hack/pinUnpin.sh pin kustomize v0.3.1
+#
+# where v0.3.1 is the most recently released version of
+# the API, and do the following afterwards:
+#
+#   ./hack/pinUnpin.sh unPin kustomize
+
+set -o nounset
+set -o pipefail
+
+if [ "$#" -lt 2 ]; then
+  echo "usage:"
+  echo "  ./hack/pinUnpin.sh pin kustomize v0.3.1"
+  echo " or "
+  echo "  ./hack/pinUnpin.sh unPin kustomize"
+  exit 1
+fi
+
+operation=$1
+if [[ ("$operation" != "pin") && ("$operation" != "unPin") ]]; then
+  echo "unknown operation $operation"
+  exit 1
+fi
+
+module=$2
+if [ ! -d "$module" ]; then
+  echo "directory $module doesn't exist"
+  exit 1
+fi
+
+version="unnecessary"
+if [ "$operation" == "pin" ]; then
+  if [ "$#" -le 2 ]; then
+    echo "Specify version to pin, e.g. '$0 $module pin v0.2.0'"
+    exit 1
+  fi
+  version=$3
+fi
+
+function unPin {
+  oldV=$(grep -m 1 sigs.k8s.io/kustomize/api go.mod | awk '{print $NF}')
+  go mod edit -replace=sigs.k8s.io/kustomize/api@${oldV}=../api
+  go mod tidy
+}
+
+function pin {
+  oldV=$(grep -m 1 sigs.k8s.io/kustomize/api go.mod | awk '{print $NF}')
+  go mod edit -dropreplace=sigs.k8s.io/kustomize/api@${oldV}
+  go mod edit -require=sigs.k8s.io/kustomize/api@$version
+  go mod tidy
+}
+
+pushd $module >& /dev/null
+$operation
+popd >& /dev/null