Get rid of hack/after-build scripts

The build is now fast enough to not need them.

hack/verify-generated-protobuf.sh

@@ -23,6 +23,39 @@ source "${KUBE_ROOT}/hack/lib/init.sh"
 
 kube::golang::setup_env
 
-"${KUBE_ROOT}/hack/after-build/verify-generated-protobuf.sh" "$@"
+APIROOTS=${APIROOTS:-pkg/api pkg/apis pkg/runtime pkg/util/intstr pkg/watch}
+_tmp="${KUBE_ROOT}/_tmp"
 
-# ex: ts=2 sw=2 et filetype=sh
+cleanup() {
+  rm -rf "${_tmp}"
+}
+
+trap "cleanup" EXIT SIGINT
+
+cleanup
+for APIROOT in ${APIROOTS}; do
+  mkdir -p "${_tmp}/${APIROOT%/*}"
+  cp -a "${KUBE_ROOT}/${APIROOT}" "${_tmp}/${APIROOT}"
+done
+
+# If not running as root, we need to use sudo to restore the original generated
+# protobuf files.
+SUDO=""
+if [[ "$(id -u)" != '0' ]]; then
+  SUDO="sudo"
+fi
+
+"${KUBE_ROOT}/hack/update-generated-protobuf.sh"
+for APIROOT in ${APIROOTS}; do
+  TMP_APIROOT="${_tmp}/${APIROOT}"
+  echo "diffing ${APIROOT} against freshly generated protobuf"
+  ret=0
+  diff -Naupr -I 'Auto generated by' "${KUBE_ROOT}/${APIROOT}" "${TMP_APIROOT}" || ret=$?
+  ${SUDO} cp -a "${TMP_APIROOT}" "${KUBE_ROOT}/${APIROOT%/*}"
+  if [[ $ret -eq 0 ]]; then
+    echo "${APIROOT} up to date."
+  else
+    echo "${APIROOT} is out of date. Please run hack/update-generated-protobuf.sh"
+    exit 1
+  fi
+done