diff --git a/hack/verify-codegen.sh b/hack/verify-codegen.sh
index 5a403a76..59b4cf78 100755
--- a/hack/verify-codegen.sh
+++ b/hack/verify-codegen.sh
@@ -14,14 +14,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-source "$(dirname $(readlink -f ${BASH_SOURCE}))/../test/library.sh"
-
 set -o errexit
 set -o nounset
 set -o pipefail
 
+readonly BUILD_ROOT_DIR="$(git rev-parse --show-toplevel)"
 readonly TMP_DIFFROOT="$(mktemp -d -p ${BUILD_ROOT_DIR})"
- 
+
 cleanup() {
   rm -rf "${TMP_DIFFROOT}"
 }
@@ -37,7 +36,7 @@ cp -aR "${BUILD_ROOT_DIR}/Gopkg.lock" "${BUILD_ROOT_DIR}/pkg" "${BUILD_ROOT_DIR}
 "${BUILD_ROOT_DIR}/hack/update-codegen.sh"
 echo "Diffing ${BUILD_ROOT_DIR} against freshly generated codegen"
 ret=0
-diff -Naupr "${BUILD_ROOT_DIR}/pkg" "${TMP_DIFFROOT}/pkg" || ret=$?
+diff -Naupr "${BUILD_ROOT_DIR}/pkg" "${TMP_DIFFROOT}/pkg" || ret=1
 
 # Restore working tree state
 rm -fr "${BUILD_ROOT_DIR}/Gopkg.lock" "${BUILD_ROOT_DIR}/pkg" "${BUILD_ROOT_DIR}/vendor"
diff --git a/test/library.sh b/test/library.sh
deleted file mode 100755
index 335d8545..00000000
--- a/test/library.sh
+++ /dev/null
@@ -1,83 +0,0 @@
-#!/bin/bash
-
-# Copyright 2018 The Knative Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is a collection of useful bash functions and constants, intended
-# to be used in test scripts and the like. It doesn't do anything when
-# called from command line.
-
-# Default GKE version to be used with build-crd
-readonly BUILD_GKE_VERSION=1.9.6-gke.1
-
-# Useful environment variables
-[[ -n "${PROW_JOB_ID}" ]] && IS_PROW=1 || IS_PROW=0
-readonly IS_PROW
-readonly BUILD_ROOT_DIR="$(dirname $(readlink -f ${BASH_SOURCE}))/.."
-readonly OUTPUT_GOBIN="${BUILD_ROOT_DIR}/_output/bin"
-
-# Copy of *_OVERRIDE variables
-readonly OG_DOCKER_REPO="${DOCKER_REPO_OVERRIDE}"
-readonly OG_K8S_CLUSTER="${K8S_CLUSTER_OVERRIDE}"
-readonly OG_KO_DOCKER_REPO="${KO_DOCKER_REPO}"
-
-# Simple header for logging purposes.
-function header() {
-  echo "================================================="
-  echo ${1^^}
-  echo "================================================="
-}
-
-# Simple subheader for logging purposes.
-function subheader() {
-  echo "-------------------------------------------------"
-  echo $1
-  echo "-------------------------------------------------"
-}
-
-# Restores the *_OVERRIDE variables to their original value.
-function restore_override_vars() {
-  export DOCKER_REPO_OVERRIDE="${OG_DOCKER_REPO}"
-  export K8S_CLUSTER_OVERRIDE="${OG_K8S_CLUSTER}"
-  export KO_DOCKER_REPO="${OG_KO_DOCKER_REPO}"
-}
-
-# Remove ALL images in the given GCR repository.
-# Parameters: $1 - GCR repository.
-function delete_gcr_images() {
-  for image in $(gcloud --format='value(name)' container images list --repository=$1); do
-    echo "Checking ${image} for removal"
-    delete_gcr_images ${image}
-    for digest in $(gcloud --format='get(digest)' container images list-tags ${image} --limit=99999); do
-      local full_image="${image}@${digest}"
-      echo "Removing ${full_image}"
-      gcloud container images delete -q --force-delete-tags ${full_image}
-    done
-  done
-}
-
-# Sets the given user as cluster admin.
-# Parameters: $1 - user
-#             $2 - cluster name
-#             $3 - cluster zone
-function acquire_cluster_admin_role() {
-  # Get the password of the admin and use it, as the service account (or the user)
-  # might not have the necessary permission.
-  local password=$(gcloud --format="value(masterAuth.password)" \
-      container clusters describe $2 --zone=$3)
-  kubectl --username=admin --password=$password \
-      create clusterrolebinding cluster-admin-binding \
-      --clusterrole=cluster-admin \
-      --user=$1
-}