Adopt GOPATH

GOPATH is annoying, but the Go community pushing me to adopt it is even
more annoying.

19 files changed, 88 insertions, 44 deletions

diff --git a/.gitignore b/.gitignore
index 431991b..96650bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 wireguard-go
 vendor
+.gopath
+ireallywantobuildon_linux.go
diff --git a/Gopkg.lock b/Gopkg.lock
index 15c0109..3731e9b 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -1,16 +1,42 @@
-# This was generated by ./generate-vendor.sh
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
 [[projects]]
   branch = "master"
   name = "golang.org/x/crypto"
+  packages = [
+    "blake2s",
+    "chacha20poly1305",
+    "curve25519",
+    "internal/chacha20",
+    "poly1305"
+  ]
   revision = "1a580b3eff7814fc9b40602fd35256c63b50f491"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
-  revision = "8e0cdda24ed423affc8f35c241e5e9b16180338e"
+  packages = [
+    "bpf",
+    "internal/iana",
+    "internal/socket",
+    "ipv4",
+    "ipv6"
+  ]
+  revision = "9ef9f5bb98a1fdc41f8cf6c250a4404b4085e389"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/sys"
-  revision = "7f59abf37be6a6007f075af1bc7f16f137bc176b"
+  packages = [
+    "cpu",
+    "unix"
+  ]
+  revision = "88eb85aaee56831ad49eaf7aa80d73de9814cde2"
 
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "d85ae9d2b4afafc3d7535505c46368cbbbec350cf876616302c1bcf44f6ec103"
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index cc569b3..3aafd44 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -1,4 +1,3 @@
-# This was generated by ./generate-vendor.sh
 [[constraint]]
   branch = "master"
   name = "golang.org/x/crypto"
@@ -11,3 +10,6 @@
   branch = "master"
   name = "golang.org/x/sys"
 
+[prune]
+  go-tests = true
+  unused-packages = true
diff --git a/Makefile b/Makefile
index e1c53c5..bef7edf 100644
--- a/Makefile
+++ b/Makefile
@@ -5,18 +5,39 @@ BINDIR ?= $(PREFIX)/bin
 ifeq ($(shell go env GOOS),linux)
 ifeq ($(wildcard .git),)
 $(error Do not build this for Linux. Instead use the Linux kernel module. See wireguard.com/install/ for more info.)
+else
+$(shell printf 'package main\nconst UseTheKernelModuleInstead = 0xdeadbabe\n' > ireallywantobuildon_linux.go)
 endif
 endif
 
 all: wireguard-go
 
-wireguard-go: $(wildcard *.go) $(wildcard */*.go)
-	go build -v -o $@
+export GOPATH := $(CURDIR)/.gopath
+export PATH := $(PATH):$(CURDIR)/.gopath/bin
+GO_IMPORT_PATH := git.zx2c4.com/wireguard-go
+
+.gopath/.created:
+	rm -rf .gopath
+	mkdir -p $(dir .gopath/src/$(GO_IMPORT_PATH))
+	ln -s ../../.. .gopath/src/$(GO_IMPORT_PATH)
+	touch $@
+
+vendor/.created: Gopkg.toml Gopkg.lock .gopath/.created
+	command -v dep >/dev/null || go get -v github.com/golang/dep/cmd/dep
+	cd .gopath/src/$(GO_IMPORT_PATH) && dep ensure -vendor-only -v
+	touch $@
+
+wireguard-go: $(wildcard *.go) $(wildcard */*.go) .gopath/.created vendor/.created
+	go build $(GO_BUILD_EXTRA_ARGS) -v $(GO_IMPORT_PATH)
 
 install: wireguard-go
-	@install -v -d "$(DESTDIR)$(BINDIR)" && install -m 0755 -v wireguard-go "$(DESTDIR)$(BINDIR)/wireguard-go"
+	@install -v -d "$(DESTDIR)$(BINDIR)" && install -v -m 0755 wireguard-go "$(DESTDIR)$(BINDIR)/wireguard-go"
 
 clean:
 	rm -f wireguard-go
 
-.PHONY: clean install
+update-dep:
+	command -v dep >/dev/null || go get -v github.com/golang/dep/cmd/dep
+	cd .gopath/src/$(GO_IMPORT_PATH) && dep ensure -update -v
+
+.PHONY: clean install update-dep
diff --git a/README.md b/README.md
index 92ef4da..35fc23a 100644
--- a/README.md
+++ b/README.md
@@ -48,13 +48,11 @@ This will run on OpenBSD. It does not yet support sticky sockets. Fwmark is mapp
 
 ## Building
 
-You can satisfy dependencies with either `go get -d -v` or `dep ensure -vendor-only`. Then run `make`. As this is a Go project, a `GOPATH` is required. For example, wireguard-go can be built with:
+This requires an installation of [go](https://golang.org) and of [dep](https://github.com/golang/dep). If dep is not installed, it will be downloaded and built as part of the build process.
 
 ```
 $ git clone https://git.zx2c4.com/wireguard-go
 $ cd wireguard-go
-$ export GOPATH="$PWD/gopath"
-$ go get -d -v
 $ make
 ```
 
diff --git a/conn_linux.go b/conn_linux.go
index fa09087..fe30afb 100644
--- a/conn_linux.go
+++ b/conn_linux.go
@@ -18,7 +18,7 @@
 package main
 
 import (
-	"./rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"errors"
 	"golang.org/x/sys/unix"
 	"net"
diff --git a/cookie.go b/cookie.go
index c39ad22..8211323 100644
--- a/cookie.go
+++ b/cookie.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./xchacha20poly1305"
+	"git.zx2c4.com/wireguard-go/xchacha20poly1305"
 	"crypto/hmac"
 	"crypto/rand"
 	"golang.org/x/crypto/blake2s"
diff --git a/device.go b/device.go
index e116731..5f7254c 100644
--- a/device.go
+++ b/device.go
@@ -7,8 +7,8 @@
 package main
 
 import (
-	"./ratelimiter"
-	"./tun"
+	"git.zx2c4.com/wireguard-go/ratelimiter"
+	"git.zx2c4.com/wireguard-go/tun"
 	"runtime"
 	"sync"
 	"sync/atomic"
diff --git a/donotuseon_linux.go b/donotuseon_linux.go
new file mode 100644
index 0000000..7197375
--- /dev/null
+++ b/donotuseon_linux.go
@@ -0,0 +1,15 @@
+// +build !android
+
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. 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/generate-vendor.sh b/generate-vendor.sh
deleted file mode 100755
index 51d0fff..0000000
--- a/generate-vendor.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-
-echo "# This was generated by ./generate-vendor.sh" > Gopkg.lock
-echo "# This was generated by ./generate-vendor.sh" > Gopkg.toml
-
-while read -r package; do
-	cat >> Gopkg.lock <<-_EOF
-	[[projects]]
-	  branch = "master"
-	  name = "$package"
-	  revision = "$(< "$GOPATH/src/$package/.git/refs/heads/master")"
-
-	_EOF
-	cat >> Gopkg.toml <<-_EOF
-	[[constraint]]
-	  branch = "master"
-	  name = "$package"
-
-	_EOF
-done < <(sed -n 's/.*"\(golang.org\/x\/[^/]\+\)\/\?.*".*/\1/p' *.go */*.go | sort | uniq)
diff --git a/keypair.go b/keypair.go
index face310..b125189 100644
--- a/keypair.go
+++ b/keypair.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./replay"
+	"git.zx2c4.com/wireguard-go/replay"
 	"crypto/cipher"
 	"sync"
 	"time"
diff --git a/main.go b/main.go
index a04cd15..29693eb 100644
--- a/main.go
+++ b/main.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./tun"
+	"git.zx2c4.com/wireguard-go/tun"
 	"fmt"
 	"os"
 	"os/signal"
diff --git a/noise-protocol.go b/noise-protocol.go
index c6a95d8..a527be9 100644
--- a/noise-protocol.go
+++ b/noise-protocol.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./tai64n"
+	"git.zx2c4.com/wireguard-go/tai64n"
 	"errors"
 	"golang.org/x/crypto/blake2s"
 	"golang.org/x/crypto/chacha20poly1305"
diff --git a/tun.go b/tun.go
index 9752636..6c239ea 100644
--- a/tun.go
+++ b/tun.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./tun"
+	"git.zx2c4.com/wireguard-go/tun"
 	"sync/atomic"
 )
 
diff --git a/tun/tun_darwin.go b/tun/tun_darwin.go
index fcbb4f9..04020cb 100644
--- a/tun/tun_darwin.go
+++ b/tun/tun_darwin.go
@@ -7,7 +7,7 @@
 package tun
 
 import (
-	"../rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"errors"
 	"fmt"
 	"golang.org/x/net/ipv6"
diff --git a/tun/tun_freebsd.go b/tun/tun_freebsd.go
index b4cf57d..bd70104 100644
--- a/tun/tun_freebsd.go
+++ b/tun/tun_freebsd.go
@@ -6,7 +6,7 @@
 package tun
 
 import (
-	"../rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"bytes"
 	"errors"
 	"fmt"
diff --git a/tun/tun_linux.go b/tun/tun_linux.go
index acfb942..d048c21 100644
--- a/tun/tun_linux.go
+++ b/tun/tun_linux.go
@@ -12,7 +12,7 @@ package tun
  */
 
 import (
-	"../rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"bytes"
 	"errors"
 	"fmt"
diff --git a/tun/tun_openbsd.go b/tun/tun_openbsd.go
index 74b25e5..709b5cd 100644
--- a/tun/tun_openbsd.go
+++ b/tun/tun_openbsd.go
@@ -6,7 +6,7 @@
 package tun
 
 import (
-	"../rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"errors"
 	"fmt"
 	"golang.org/x/net/ipv6"
diff --git a/uapi_linux.go b/uapi_linux.go
index 2b5b9a0..5e86628 100644
--- a/uapi_linux.go
+++ b/uapi_linux.go
@@ -7,7 +7,7 @@
 package main
 
 import (
-	"./rwcancel"
+	"git.zx2c4.com/wireguard-go/rwcancel"
 	"errors"
 	"fmt"
 	"golang.org/x/sys/unix"