wireguard-go-bridge: use system go installation

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

3 files changed, 23 insertions, 25 deletions

diff --git a/wireguard-go-bridge/Makefile b/wireguard-go-bridge/Makefile
index d957e0c..ae9fa09 100644
--- a/wireguard-go-bridge/Makefile
+++ b/wireguard-go-bridge/Makefile
@@ -26,34 +26,31 @@ export CGO_ENABLED := 1
 build: $(DESTDIR)/libwg-go.a
 version-header: $(DESTDIR)/wireguard-go-version.h
 
-GOBUILDARCH := $(GOARCH_$(shell uname -m))
-GOBUILDOS := $(shell uname -s | tr '[:upper:]' '[:lower:]')
-GOBUILDVERSION := 1.12
-GOBUILDTARBALL := go$(GOBUILDVERSION).$(GOBUILDOS)-$(GOBUILDARCH).tar.gz
-GOBUILDTARBALLURL := https://dl.google.com/go/$(GOBUILDTARBALL)
-GOBUILDVERSION_NEEDED := go version go$(GOBUILDVERSION) $(GOBUILDOS)/$(GOBUILDARCH)
+GOBUILDVERSION_NEEDED := go version go1.12 darwin/amd64
+GOBUILDVERSION_CURRENT := $(shell go version 2>/dev/null)
+export REAL_GOROOT := $(shell go env GOROOT 2>/dev/null)
 export GOROOT := $(BUILDDIR)/goroot
 export GOPATH := $(BUILDDIR)/gopath
-export PATH := $(GOROOT)/bin:$(PATH)
-GOBUILDVERSION_CURRENT := $(shell $(GOROOT)/bin/go version 2>/dev/null)
+export PATH := $(GOPATH)/bin:$(PATH)
+GOBUILDVERSION_FAKE := $(shell $(GOROOT)/bin/go version 2>/dev/null)
 ifneq ($(GOBUILDVERSION_NEEDED),$(GOBUILDVERSION_CURRENT))
-$(shell rm -f $(GOROOT)/bin/go)
+$(error This requires $(GOBUILDVERSION_NEEDED))
+endif
+ifneq ($(GOBUILDVERSION_NEEDED),$(GOBUILDVERSION_FAKE))
+$(shell rm -f $(GOROOT)/.prepared)
 endif
-.cache/$(GOBUILDTARBALL):
-	mkdir -p $(dir $@)
-	curl -o $@ $(GOBUILDTARBALLURL) || { rm -f $@; exit 1; }
 
-$(GOROOT)/bin/go: .cache/$(GOBUILDTARBALL)
-	rm -rf "$(GOROOT)"
+$(GOROOT)/.prepared:
+	[ -n "$(REAL_GOROOT)" ]
 	mkdir -p "$(GOROOT)"
-	tar -C "$(GOROOT)" --strip-components=1 -xzf - < .cache/$(GOBUILDTARBALL) || { rm -rf "$(GOROOT)"; exit 1; }
-	patch -p1 -f -N -r- -d "$(GOROOT)" < goruntime-boottime-over-monotonic.diff || { rm -rf "$(GOROOT)"; exit 1; }
-	touch $@
+	rsync -a --delete --exclude=pkg/obj/go-build "$(REAL_GOROOT)/" "$(GOROOT)/"
+	patch -p1 -f -N -r- -d "$(GOROOT)" < goruntime-boottime-over-monotonic.diff
+	touch "$@"
 
 $(shell test "$$(cat "$(BUILDDIR)/.gobuildversion" 2>/dev/null)" = "$(GOBUILDVERSION_CURRENT)" || rm -f "$(DESTDIR)/libwg-go.a")
 
 define libwg-go-a
-$(BUILDDIR)/libwg-go-$(1).a: $(GOROOT)/bin/go
+$(BUILDDIR)/libwg-go-$(1).a: $(GOROOT)/.prepared
 	CGO_CFLAGS="$(CFLAGS_PREFIX) $(ARCH)" \
 	CGO_LDFLAGS="$(CFLAGS_PREFIX) $(ARCH)" \
 	GOARCH="$(GOARCH_$(1))" \
@@ -65,7 +62,7 @@ $(BUILDDIR)/libwg-go-$(1).a: $(GOROOT)/bin/go
 endef
 $(foreach ARCH,$(ARCHS),$(eval $(call libwg-go-a,$(ARCH))))
 
-$(DESTDIR)/wireguard-go-version.h: go.mod $(GOROOT)/bin/go
+$(DESTDIR)/wireguard-go-version.h: go.mod $(GOROOT)/.prepared
 	go get -d -tags ios; chmod -fR +w "$(GOPATH)/pkg/mod"
 	wggo="$(GOPATH)/pkg/mod/$$(sed -n 's/.*\(golang\.zx2c4\.com\/wireguard\) \(.*\)$$/\1@\2/p' go.mod)"; \
 	sed -n 's/.*WireGuardGoVersion = "\(.*\)"/#define WIREGUARD_GO_VERSION "\1"/p' "$$wggo/device/version.go" > "$@"
@@ -77,9 +74,6 @@ $(DESTDIR)/libwg-go.a: $(foreach ARCH,$(ARCHS),$(BUILDDIR)/libwg-go-$(ARCH).a)
 clean:
 	rm -rf "$(BUILDDIR)" "$(DESTDIR)/libwg-go.a" "$(DESTDIR)/wireguard-go-version.h"
 
-distclean: clean
-	rm -rf .cache
-
 install: build
 
-.PHONY: distclean clean build version-header install
+.PHONY: clean build version-header install
diff --git a/wireguard-go-bridge/go.mod b/wireguard-go-bridge/go.mod
index 82d4128..8812765 100644
--- a/wireguard-go-bridge/go.mod
+++ b/wireguard-go-bridge/go.mod
@@ -3,6 +3,6 @@ module golang.zx2c4.com/wireguard/ios
 go 1.12
 
 require (
-	golang.org/x/sys v0.0.0-20190302025703-b6889370fb10
-	golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa
+	golang.org/x/sys v0.0.0-20190308023053-584f3b12f43e
+	golang.zx2c4.com/wireguard v0.0.0-20190308004054-5c7cc256e39a
 )
diff --git a/wireguard-go-bridge/go.sum b/wireguard-go-bridge/go.sum
index dc78250..804f5c6 100644
--- a/wireguard-go-bridge/go.sum
+++ b/wireguard-go-bridge/go.sum
@@ -6,5 +6,9 @@ golang.org/x/net v0.0.0-20190301231341-16b79f2e4e95/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190302025703-b6889370fb10 h1:xQJI9OEiErEQ++DoXOHqEpzsGMrAv2Q2jyCpi7DmfpQ=
 golang.org/x/sys v0.0.0-20190302025703-b6889370fb10/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190308023053-584f3b12f43e h1:K7CV15oJ823+HLXQ+M7MSMrUg8LjfqY7O3naO+8Pp/I=
+golang.org/x/sys v0.0.0-20190308023053-584f3b12f43e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa h1:t/IV/5G9uPXXDoaOrk+Lx2VsFhbqWGYFE+GEl160Yzc=
 golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa/go.mod h1:Koyxt99ZAZcr8lJuisBNX9vnaqKVNGcITeWOI1Zkmsw=
+golang.zx2c4.com/wireguard v0.0.0-20190308004054-5c7cc256e39a h1:RvrH0NQcXaN9h2JoBDAI3BWcTTJL3vH9L1gHQY0T76w=
+golang.zx2c4.com/wireguard v0.0.0-20190308004054-5c7cc256e39a/go.mod h1:Koyxt99ZAZcr8lJuisBNX9vnaqKVNGcITeWOI1Zkmsw=