From 84b5a4d83d14189fe5898bd896680e7acde2c028 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 8 Sep 2019 10:56:00 -0500
Subject: [PATCH] main: simplify warnings

---
 Makefile            | 14 --------------
 donotuseon_linux.go | 15 ---------------
 main.go             | 16 +---------------
 3 files changed, 1 insertion(+), 44 deletions(-)
 delete mode 100644 donotuseon_linux.go

diff --git a/Makefile b/Makefile
index 1a154ef..842e069 100644
--- a/Makefile
+++ b/Makefile
@@ -1,24 +1,10 @@
 PREFIX ?= /usr
 DESTDIR ?=
 BINDIR ?= $(PREFIX)/bin
-export GOPATH ?= $(CURDIR)/.gopath
 export GO111MODULE := on
 
 all: generate-version-and-build
 
-ifeq ($(shell go env GOOS)|$(wildcard .git),linux|)
-$(error Do not build this for Linux. Instead use the Linux kernel module. See wireguard.com/install/ for more info.)
-else ifeq ($(shell go env GOOS),linux)
-ireallywantobuildon_linux.go:
-	@printf "WARNING: This software is meant for use on non-Linux\nsystems. For Linux, please use the kernel module\ninstead. See wireguard.com/install/ for more info.\n\n" >&2
-	@printf 'package main\nconst UseTheKernelModuleInstead = 0xdeadbabe\n' > "$@"
-clean-ireallywantobuildon_linux.go:
-	@rm -f ireallywantobuildon_linux.go
-.PHONY: clean-ireallywantobuildon_linux.go
-clean: clean-ireallywantobuildon_linux.go
-wireguard-go: ireallywantobuildon_linux.go
-endif
-
 MAKEFLAGS += --no-print-directory
 
 generate-version-and-build:
diff --git a/donotuseon_linux.go b/donotuseon_linux.go
deleted file mode 100644
index ee8a83b..0000000
--- a/donotuseon_linux.go
+++ /dev/null
@@ -1,15 +0,0 @@
-// +build !android
-
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
- */
-
-package main
-
-const DoNotUseThisProgramOnLinux = UseTheKernelModuleInstead
-
-// --------------------------------------------------------
-// Do not use this on Linux. Instead use the kernel module.
-// See wireguard.com/install for more information.
-// --------------------------------------------------------
diff --git a/main.go b/main.go
index 12753d6..053f488 100644
--- a/main.go
+++ b/main.go
@@ -40,31 +40,19 @@ func warning() {
 	if runtime.GOOS != "linux" || os.Getenv(ENV_WG_PROCESS_FOREGROUND) == "1" {
 		return
 	}
-	shouldQuit := os.Getenv("WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD") != "1"
 
 	fmt.Fprintln(os.Stderr, "WARNING WARNING WARNING WARNING WARNING WARNING WARNING")
 	fmt.Fprintln(os.Stderr, "W                                                     G")
 	fmt.Fprintln(os.Stderr, "W   You are running this software on a Linux kernel,  G")
-	fmt.Fprintln(os.Stderr, "W   which is probably unnecessary and foolish. This   G")
+	fmt.Fprintln(os.Stderr, "W   which is probably unnecessary and misguided. This G")
 	fmt.Fprintln(os.Stderr, "W   is because the Linux kernel has built-in first    G")
 	fmt.Fprintln(os.Stderr, "W   class support for WireGuard, and this support is  G")
 	fmt.Fprintln(os.Stderr, "W   much more refined than this slower userspace      G")
 	fmt.Fprintln(os.Stderr, "W   implementation. For more information on           G")
 	fmt.Fprintln(os.Stderr, "W   installing the kernel module, please visit:       G")
 	fmt.Fprintln(os.Stderr, "W           https://www.wireguard.com/install         G")
-	if shouldQuit {
-		fmt.Fprintln(os.Stderr, "W                                                     G")
-		fmt.Fprintln(os.Stderr, "W   If you still want to use this program, against    G")
-		fmt.Fprintln(os.Stderr, "W   the advice here, please first export this         G")
-		fmt.Fprintln(os.Stderr, "W   environment variable:                             G")
-		fmt.Fprintln(os.Stderr, "W   WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD=1    G")
-	}
 	fmt.Fprintln(os.Stderr, "W                                                     G")
 	fmt.Fprintln(os.Stderr, "WARNING WARNING WARNING WARNING WARNING WARNING WARNING")
-
-	if shouldQuit {
-		os.Exit(1)
-	}
 }
 
 func main() {
@@ -75,8 +63,6 @@ func main() {
 
 	warning()
 
-	// parse arguments
-
 	var foreground bool
 	var interfaceName string
 	if len(os.Args) < 2 || len(os.Args) > 3 {