wireguard-go 0.0.20180514

This adds wireguard-go, which is the whole reason wireguard-tools has
been around in the first place. With this package, homebrew's wireguard
offerings are now actually functional. It's about time.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Formula/wireguard-go.rb

@@ -0,0 +1,24 @@
+class WireguardGo < Formula
+  desc "Userspace Go implementation of WireGuard"
+  homepage "https://www.wireguard.com/"
+  url "https://git.zx2c4.com/wireguard-go/snapshot/wireguard-go-0.0.20180514.tar.xz"
+  sha256 "5a2a0ac5a3c64a9d0c1811d349c6f3f5deb55c15f00f4c13054b897a8c4ac4ae"
+
+  depends_on "dep" => :build
+  depends_on "go" => :build
+
+  def install
+    ENV["GOPATH"] = buildpath
+    (buildpath/"src/wireguard-go").install buildpath.children
+    cd "src/wireguard-go" do
+      system "dep", "ensure", "-vendor-only"
+      (buildpath/"gopath/src").install (buildpath/"src/wireguard-go/vendor").children
+      ENV["GOPATH"] = buildpath/"gopath"
+      system "make", "PREFIX=#{prefix}", "install"
+    end
+  end
+
+  test do
+    assert_match "be utun", pipe_output("WG_PROCESS_FOREGROUND=1 #{bin}/wireguard-go notrealutun")
+  end
+end