From 2df08ccdf51b867fbb81148b86c6416b0a1349d8 Mon Sep 17 00:00:00 2001
From: Robert Bailey <robertbailey@google.com>
Date: Mon, 28 Nov 2016 09:47:29 -0800
Subject: [PATCH] Use gsed on the mac.

---
 cluster/gce/util.sh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/cluster/gce/util.sh b/cluster/gce/util.sh
index c8a54b0adf..6f99ff48b9 100755
--- a/cluster/gce/util.sh
+++ b/cluster/gce/util.sh
@@ -1913,5 +1913,14 @@ function prepare-e2e() {
 # limits the size of metadata fields to 32K, and stripping comments is the
 # easiest way to buy us a little more room.
 function prepare-startup-script() {
-  sed '/^\s*#\([^!].*\)*$/ d' ${KUBE_ROOT}/cluster/gce/configure-vm.sh > ${KUBE_TEMP}/configure-vm.sh
+  # Find a standard sed instance (and ensure that the command works as expected on a Mac).
+  SED=sed
+  if which gsed &>/dev/null; then
+    SED=gsed
+  fi
+  if ! ($SED --version 2>&1 | grep -q GNU); then
+    echo "!!! GNU sed is required.  If on OS X, use 'brew install gnu-sed'."
+    exit 1
+  fi
+  $SED '/^\s*#\([^!].*\)*$/ d' ${KUBE_ROOT}/cluster/gce/configure-vm.sh > ${KUBE_TEMP}/configure-vm.sh
 }