add dependency scripts

hack/lib/golang.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This is a modified version of Kubernetes
+
+
+# Ensure the go tool exists and is a viable version.
+kube::golang::verify_go_version() {
+  if [[ -z "$(command -v go)" ]]; then
+    kube::log::usage_from_stdin <<EOF
+Can't find 'go' in PATH, please fix and retry.
+See http://golang.org/doc/install for installation instructions.
+EOF
+    return 2
+  fi
+
+  local go_version
+  IFS=" " read -ra go_version <<< "$(go version)"
+  local minimum_go_version
+  minimum_go_version=go1.12.1
+  if [[ "${minimum_go_version}" != $(echo -e "${minimum_go_version}\n${go_version[2]}" | sort -s -t. -k 1,1 -k 2,2n -k 3,3n | head -n1) && "${go_version[2]}" != "devel" ]]; then
+    kube::log::usage_from_stdin <<EOF
+Detected go version: ${go_version[*]}.
+Kubernetes requires ${minimum_go_version} or greater.
+Please install ${minimum_go_version} or later.
+EOF
+    return 2
+  fi
+}