tools.mk: install protoc

- works only for Linux / Mac 64bit
- you need to call it manually - make protoc
- on Mac, brew install protoc might be favorable

tools.mk

@@ -35,7 +35,7 @@ mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
 mkfile_dir := $(shell cd $(shell dirname $(mkfile_path)); pwd)
 
 ###
-# tools
+# Go tools
 ###
 
 TOOLS_DESTDIR  ?= $(GOPATH)/bin
@@ -63,7 +63,7 @@ $(CERTSTRAP):
 
 protobuf: $(PROTOBUF)
 $(PROTOBUF):
-	@echo "Get Protobuf"
+	@echo "Get GoGo Protobuf"
 	@go get github.com/gogo/protobuf/protoc-gen-gogo@v1.3.1
 
 # used to build tm-monitor binaries
@@ -80,5 +80,32 @@ $(GOODMAN):
 tools-clean:
 	rm -f $(CERTSTRAP) $(PROTOBUF) $(GOX) $(GOODMAN)
 	rm -f tools-stamp
+	rm -rf /usr/local/include/google/protobuf
+	rm -f /usr/local/bin/protoc
 
-.PHONY: all tools tools-clean
+###
+# Non Go tools
+###
+
+# Choose protobuf binary based on OS (only works for 64bit Linux and Mac).
+# NOTE: On Mac, installation via brew (brew install protoc) might be favorable.
+PROTOC_ZIP=""
+ifneq ($(OS),Windows_NT)
+		UNAME_S := $(shell uname -s)
+		ifeq ($(UNAME_S),Linux)
+			PROTOC_ZIP="protoc-3.10.1-linux-x86_64.zip"
+		endif
+		ifeq ($(UNAME_S),Darwin)
+			PROTOC_ZIP="protoc-3.10.1-osx-x86_64.zip"
+		endif
+endif
+
+protoc:
+	@echo "Get Protobuf"
+	@echo "In case of any errors, please install directly from https://github.com/protocolbuffers/protobuf/releases"
+	@curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v3.10.1/$(PROTOC_ZIP)
+	@unzip -o $(PROTOC_ZIP) -d /usr/local bin/protoc
+	@unzip -o $(PROTOC_ZIP) -d /usr/local 'include/*'
+	@rm -f $(PROTOC_ZIP)
+
+.PHONY: all tools tools-clean protoc