From 4a9de3218e6445742f29fef06f8b2f1dcef6306f Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 24 May 2018 01:52:22 +0200
Subject: Add undocumented --version flag

---
 Makefile | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 4cba1de..93874e9 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,14 @@ export GOPATH := $(CURDIR)/.gopath
 export PATH := $(PATH):$(CURDIR)/.gopath/bin
 GO_IMPORT_PATH := git.zx2c4.com/wireguard-go
 
+version.go:
+	@export GIT_CEILING_DIRECTORIES="$(realpath $(CURDIR)/..)" && \
+	tag="$$(git describe --dirty 2>/dev/null)" && \
+	ver="$$(printf 'package main\nconst WireGuardGoVersion = "%s"\n' "$$tag")" && \
+	[ "$$(cat $@ 2>/dev/null)" != "$$ver" ] && \
+	echo "$$ver" > $@ && \
+	git update-index --assume-unchanged $@ || true
+
 .gopath/.created:
 	rm -rf .gopath
 	mkdir -p $(dir .gopath/src/$(GO_IMPORT_PATH))
@@ -27,7 +35,7 @@ vendor/.created: Gopkg.toml Gopkg.lock | .gopath/.created
 	cd .gopath/src/$(GO_IMPORT_PATH) && dep ensure -vendor-only -v
 	touch $@
 
-wireguard-go: $(wildcard *.go) $(wildcard */*.go) .gopath/.created vendor/.created
+wireguard-go: $(wildcard *.go) $(wildcard */*.go) .gopath/.created vendor/.created version.go
 	go build $(GO_BUILD_EXTRA_ARGS) -v $(GO_IMPORT_PATH)
 
 install: wireguard-go
@@ -40,4 +48,4 @@ update-dep: | .gopath/.created
 	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
+.PHONY: clean install update-dep version.go
-- 
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