Fix get_tools command

Makefile

@@ -1,6 +1,8 @@
 GOTOOLS = \
-	github.com/golang/dep/cmd/dep \
-	gopkg.in/alecthomas/gometalinter.v2 \
+	github.com/mitchellh/gox \
+    github.com/golang/dep/cmd/dep \
+    github.com/alecthomas/gometalinter \
+    github.com/gogo/protobuf/protoc-gen-gogo \
 	github.com/gobuffalo/packr/packr
 PACKAGES=$(shell go list ./... | grep -v '/vendor/')
 BUILD_TAGS?=minter
@@ -30,8 +32,7 @@ check_tools:
 
 get_tools:
 	@echo "--> Installing tools"
-	go get -u -v $(GOTOOLS)
-	@gometalinter.v2 --install
+	./scripts/get_tools.sh
 
 update_tools:
 	@echo "--> Updating tools"

scripts/get_tools.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -e
+
+## check if GOPATH is set
+if [ -z ${GOPATH+x} ]; then
+	echo "please set GOPATH (https://github.com/golang/go/wiki/SettingGOPATH)"
+	exit 1
+fi
+
+mkdir -p "$GOPATH/src/github.com"
+cd "$GOPATH/src/github.com" || exit 1
+
+installFromGithub() {
+	repo=$1
+	commit=$2
+	# optional
+	subdir=$3
+	echo "--> Installing $repo ($commit)..."
+	if [ ! -d "$repo" ]; then
+		mkdir -p "$repo"
+		git clone "https://github.com/$repo.git" "$repo"
+	fi
+	if [ ! -z ${subdir+x} ] && [ ! -d "$repo/$subdir" ]; then
+		echo "ERROR: no such directory $repo/$subdir"
+		exit 1
+	fi
+	pushd "$repo" && \
+		git fetch origin && \
+		git checkout -q "$commit" && \
+		if [ ! -z ${subdir+x} ]; then cd "$subdir" || exit 1; fi && \
+		go install && \
+		if [ ! -z ${subdir+x} ]; then cd - || exit 1; fi && \
+		popd || exit 1
+	echo "--> Done"
+	echo ""
+}
+
+installFromGithub mitchellh/gox 51ed453898ca5579fea9ad1f08dff6b121d9f2e8
+installFromGithub golang/dep 22125cfaa6ddc71e145b1535d4b7ee9744fefff2 cmd/dep
+installFromGithub alecthomas/gometalinter 17a7ffa42374937bfecabfb8d2efbd4db0c26741
+installFromGithub gogo/protobuf 61dbc136cf5d2f08d68a011382652244990a53a9 protoc-gen-gogo
+installFromGithub square/certstrap e27060a3643e814151e65b9807b6b06d169580a7
+installFromGithub gobuffalo/packr 0bf68f085c6ef75e9f2403052b9e79ddd42a660e