From 3b8b9e6a24e9aaeafa7cc74c7efe0334e48b93ff Mon Sep 17 00:00:00 2001
From: Chen Zhiwei <zhiweik@gmail.com>
Date: Wed, 20 Dec 2017 17:24:36 +0800
Subject: [PATCH] Build Kubernetes binaries with valid Semantic Version

---
 hack/lib/version.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hack/lib/version.sh b/hack/lib/version.sh
index f8cf2ea2b9..d6120d5a42 100644
--- a/hack/lib/version.sh
+++ b/hack/lib/version.sh
@@ -96,6 +96,13 @@ kube::version::get_version_vars() {
           KUBE_GIT_MINOR+="+"
         fi
       fi
+
+      # If KUBE_GIT_VERSION is not a valid Semantic Version, then refuse to build.
+      if ! [[ "${KUBE_GIT_VERSION}" =~ ^v([0-9]+)\.([0-9]+)(\.[0-9]+)?(-[0-9A-Za-z.-]+)?(\+[0-9A-Za-z.-]+)?$ ]]; then
+          echo "KUBE_GIT_VERSION should be a valid Semantic Version"
+          echo "Please see more details here: https://semver.org"
+          exit 1
+      fi
     fi
   fi
 }