Bumping k8s dependencies to 1.13

vendor/golang.org/x/tools/godoc/env/env.go

@@ -0,0 +1,41 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package env provides environment information for the godoc server running on
+// golang.org.
+package env
+
+import (
+	"log"
+	"os"
+	"strconv"
+)
+
+var (
+	isProd       = boolEnv("GODOC_PROD")
+	enforceHosts = boolEnv("GODOC_ENFORCE_HOSTS")
+)
+
+// IsProd reports whether the server is running in its production configuration
+// on golang.org.
+func IsProd() bool {
+	return isProd
+}
+
+// EnforceHosts reports whether host filtering should be enforced.
+func EnforceHosts() bool {
+	return enforceHosts
+}
+
+func boolEnv(key string) bool {
+	v := os.Getenv(key)
+	if v == "" {
+		return false
+	}
+	b, err := strconv.ParseBool(v)
+	if err != nil {
+		log.Fatalf("environment variable %s (%q) must be a boolean", key, v)
+	}
+	return b
+}