fix shellcheck failures of hack/update-vendor-licenses.sh

hack/.shellcheck_failures

@@ -51,7 +51,6 @@
 ./hack/update-gofmt.sh
 ./hack/update-openapi-spec.sh
 ./hack/update-translations.sh
-./hack/update-vendor-licenses.sh
 ./hack/update-vendor.sh
 ./hack/update-workspace-mirror.sh
 ./hack/verify-api-groups.sh

hack/update-vendor-licenses.sh

@@ -93,7 +93,8 @@ process_content () {
   esac
 
   # Find files - only root and package level
-  local_files=($(
+  local_files=()
+  IFS=" " read -r -a local_files <<< "$(
     for dir_root in ${package} ${package_root}; do
       [[ -d ${DEPS_DIR}/${dir_root} ]] || continue
 
@@ -101,7 +102,7 @@ process_content () {
       find "${DEPS_DIR}/${dir_root}" \
           -xdev -follow -maxdepth ${find_maxdepth} \
           -type f "${find_names[@]}"
-    done | sort -u))
+    done | sort -u)"
 
   local index
   local f
@@ -126,13 +127,13 @@ process_content () {
 #############################################################################
 # MAIN
 #############################################################################
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 source "${KUBE_ROOT}/hack/lib/init.sh"
 
 export GO111MODULE=on
 
 # Check bash version
-if ((${BASH_VERSINFO[0]}<4)); then
+if (( BASH_VERSINFO[0] < 4 )); then
   echo
   echo "ERROR: Bash v4+ required."
   # Extra help for OSX
@@ -161,7 +162,7 @@ echo "= Kubernetes licensed under: ="
 echo
 cat "${LICENSE_ROOT}/LICENSE"
 echo
-echo "= LICENSE $(cat "${LICENSE_ROOT}/LICENSE" | md5sum | awk '{print $1}')"
+echo "= LICENSE $(md5sum < "${LICENSE_ROOT}/LICENSE" | awk '{print $1}')"
 echo "================================================================================"
 ) > ${TMP_LICENSE_FILE}
 
@@ -210,7 +211,7 @@ __EOF__
   cat "${file}"
 
   echo
-  echo "= ${file} $(cat "${file}" | md5sum | awk '{print $1}')"
+  echo "= ${file} $(md5sum < "${file}" | awk '{print $1}')"
   echo "================================================================================"
   echo
 done >> ${TMP_LICENSE_FILE}