build: get GitSHA first

build

@@ -5,16 +5,16 @@ ORG_PATH="github.com/coreos"
 REPO_PATH="${ORG_PATH}/etcd"
 export GO15VENDOREXPERIMENT="1"
 
-# Set GO_LDFLAGS="" for building with all symbols for debugging.
-if [ -z "${GO_LDFLAGS+x}" ]; then GO_LDFLAGS="-s"; fi
-GO_LDFLAGS="$GO_LDFLAGS -X ${REPO_PATH}/cmd/vendor/${REPO_PATH}/version.GitSHA=${GIT_SHA}"
-
 eval $(go env)
 GIT_SHA=`git rev-parse --short HEAD || echo "GitNotFound"`
 if [ ! -z "$FAILPOINTS" ]; then
 	GIT_SHA="$GIT_SHA"-FAILPOINTS
 fi
 
+# Set GO_LDFLAGS="" for building with all symbols for debugging.
+if [ -z "${GO_LDFLAGS+x}" ]; then GO_LDFLAGS="-s"; fi
+GO_LDFLAGS="$GO_LDFLAGS -X ${REPO_PATH}/cmd/vendor/${REPO_PATH}/version.GitSHA=${GIT_SHA}"
+
 # enable/disable failpoints
 toggle_failpoints() {
 	FAILPKGS="etcdserver/ mvcc/backend/"