Fix shellcheck failures on verify-readonly-packages.sh

Author: xichengliudui

hack/.shellcheck_failures

@@ -47,7 +47,6 @@
 ./hack/verify-golint.sh
 ./hack/verify-no-vendor-cycles.sh
 ./hack/verify-openapi-spec.sh
-./hack/verify-readonly-packages.sh
 ./hack/verify-test-featuregates.sh
 ./test/cmd/apply.sh
 ./test/cmd/apps.sh

hack/verify-readonly-packages.sh

@@ -22,7 +22,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 source "${KUBE_ROOT}/hack/lib/init.sh"
 
 readonly branch=${1:-${KUBE_VERIFY_GIT_BRANCH:-master}}
@@ -44,12 +44,17 @@ find_files() {
 }
 
 IFS=$'\n'
-conflicts=($(find_files | sed 's|/.readonly||' | while read dir; do
+
+conflicts=()
+while IFS=$'\n' read -r line; do
+  conflicts+=( "$line" )
+done < <(find_files | sed 's|/.readonly||' | while read -r dir; do
     dir=${dir#./}
     if kube::util::has_changes "${branch}" "^${dir}/[^/]*\$" '/\.readonly$|/BUILD$|/zz_generated|/\.generated\.|\.proto$|\.pb\.go$' >/dev/null; then
         echo "${dir}"
     fi
-done))
+done)
+
 unset IFS
 
 if [ ${#conflicts[@]} -gt 0 ]; then