hack/update-codegen.sh: fix finding api names.

Use "find -exec" instead of plain "find | xargs" to fix handling of
difficult file names (such as those containing spaces). Also, use
"mapfile" for creating the array from the output instead of letting the
shell split the results into the array. Add double quotes to places
where variable handling needs it to prevent splitting and globbing.

hack/update-codegen.sh

@@ -82,45 +82,37 @@ INTERNAL_DIRS_CSV=$(IFS=',';echo "${INTERNAL_DIRS[*]// /,}";IFS=$)
 ${clientgen} --input-base="k8s.io/kubernetes/pkg/apis" --input="${INTERNAL_DIRS_CSV}" "$@"
 ${clientgen} --output-base "${KUBE_ROOT}/vendor" --output-package="k8s.io/client-go" --clientset-name="kubernetes" --input-base="k8s.io/kubernetes/vendor/k8s.io/api" --input="${GV_DIRS_CSV}" "$@"
 
-listergen_internal_apis=(
-$(
-  cd ${KUBE_ROOT}
-  find pkg/apis -maxdepth 2 -name types.go | xargs -n1 dirname | sort
+mapfile -t listergen_internal_apis < <(
+	cd "${KUBE_ROOT}"
+	sort <(find pkg/apis -maxdepth 2 -name types.go -exec dirname {} \;)
 )
-)
-listergen_internal_apis=(${listergen_internal_apis[@]/#/k8s.io/kubernetes/})
+listergen_internal_apis=("${listergen_internal_apis[@]/#/k8s.io/kubernetes/}")
 listergen_internal_apis_csv=$(IFS=,; echo "${listergen_internal_apis[*]}")
 ${listergen} --input-dirs "${listergen_internal_apis_csv}" "$@"
 
-listergen_external_apis=(
-$(
-  cd ${KUBE_ROOT}/staging/src
-  find k8s.io/api -name types.go | xargs -n1 dirname | sort
-)
+mapfile -t listergen_external_apis < <(
+	cd "${KUBE_ROOT}/staging/src"
+	sort <(find k8s.io/api -name types.go -exec dirname {} \;)
 )
 listergen_external_apis_csv=$(IFS=,; echo "${listergen_external_apis[*]}")
 ${listergen} --output-base "${KUBE_ROOT}/vendor" --output-package "k8s.io/client-go/listers" --input-dirs "${listergen_external_apis_csv}" "$@"
 
-informergen_internal_apis=(
-$(
-  cd ${KUBE_ROOT}
-  find pkg/apis -maxdepth 2 -name types.go | xargs -n1 dirname | sort
+mapfile -t informergen_internal_apis < <(
+	cd "${KUBE_ROOT}"
+	sort <(find pkg/apis -maxdepth 2 -name types.go -exec dirname {} \;)
 )
-)
-informergen_internal_apis=(${informergen_internal_apis[@]/#/k8s.io/kubernetes/})
+informergen_internal_apis=("${informergen_internal_apis[@]/#/k8s.io/kubernetes/}")
 informergen_internal_apis_csv=$(IFS=,; echo "${informergen_internal_apis[*]}")
 ${informergen} \
   --input-dirs "${informergen_internal_apis_csv}" \
   --internal-clientset-package k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset \
   --listers-package k8s.io/kubernetes/pkg/client/listers \
   "$@"
 
-informergen_external_apis=(
-$(
-  cd ${KUBE_ROOT}/staging/src
-  # because client-gen doesn't do policy/v1alpha1, we have to skip it too
-  find k8s.io/api -name types.go | xargs -n1 dirname | sort | grep -v pkg.apis.policy.v1alpha1
-)
+mapfile -t informergen_external_apis < <(
+	cd "${KUBE_ROOT}/staging/src"
+	# because client-gen doesn't do policy/v1alpha1, we have to skip it too
+	sort <(find k8s.io/api -name types.go -exec dirname {} \;) | grep -v pkg.apis.policy.v1alpha1
 )
 
 informergen_external_apis_csv=$(IFS=,; echo "${informergen_external_apis[*]}")