[BUILD] Use a temp build area for gotools

It seems rather sloppy to spray files into the users
$GOPATH, so lets clean this up. We still need to
store the binaries in $GOPATH/bin for now to accomodate
the CI process.  We can clean this up later.

Change-Id: I06809c35dbbaa7544ae838c7d2154a5b5e0f1bfb
Signed-off-by: Greg Haskins <gregory.haskins@gmail.com>

Makefile

@@ -60,10 +60,6 @@ EXECUTABLES = go docker git curl
 K := $(foreach exec,$(EXECUTABLES),\
 	$(if $(shell which $(exec)),some string,$(error "No $(exec) in PATH: Check dependencies")))
 
-# SUBDIRS are components that have their own Makefiles that we can invoke
-SUBDIRS = gotools
-SUBDIRS:=$(strip $(SUBDIRS))
-
 GOSHIM_DEPS = $(shell ./scripts/goListFiles.sh $(PKGNAME)/core/chaincode/shim | sort | uniq)
 JAVASHIM_DEPS =  $(shell git ls-files core/chaincode/shim/java)
 PROJECT_FILES = $(shell git ls-files)
@@ -74,9 +70,13 @@ all: peer orderer checks
 
 checks: linter unit-test behave
 
-.PHONY: $(SUBDIRS)
-$(SUBDIRS):
-	cd $@ && $(MAKE)
+.PHONY: gotools
+gotools:
+	mkdir -p build/bin
+	cd gotools && $(MAKE) install BINDIR=$(GOPATH)/bin
+
+gotools-clean:
+	cd gotools && $(MAKE) clean
 
 membersrvc-image:
 	@echo "membersrvc has been removed from this build"
@@ -252,12 +252,8 @@ src-image-clean: ccenv-image-clean peer-image-clean orderer-image-clean
 
 images-clean: $(patsubst %,%-image-clean, $(IMAGES))
 
-.PHONY: $(SUBDIRS:=-clean)
-$(SUBDIRS:=-clean):
-	cd $(patsubst %-clean,%,$@) && $(MAKE) clean
-
 .PHONY: clean
-clean: images-clean $(filter-out gotools-clean, $(SUBDIRS:=-clean))
+clean: images-clean
 	-@rm -rf build ||:
 
 .PHONY: dist-clean

gotools/Makefile

@@ -16,8 +16,14 @@
 # under the License.
 #
 
+BINDIR ?= /usr/local/bin
+OBJDIR ?= build
+
+TMP_GOPATH=$(OBJDIR)/gopath
+GOBIN=$(TMP_GOPATH)/bin
+
 GOTOOLS = golint govendor goimports protoc-gen-go ginkgo gocov gocov-xml
-GOTOOLS_BIN = $(patsubst %,$(GOPATH)/bin/%, $(GOTOOLS))
+GOTOOLS_BIN = $(patsubst %,$(GOBIN)/%, $(GOTOOLS))
 
 # go tool->path mapping
 go.fqp.govendor  := github.com/kardianos/govendor
@@ -29,23 +35,27 @@ go.fqp.gocov-xml := github.com/AlekSi/gocov-xml
 
 all: $(GOTOOLS_BIN)
 
+install: $(GOTOOLS_BIN)
+	@mkdir -p $(BINDIR)
+	cp $^ $(BINDIR)
+
 # Special override for protoc-gen-go since we want to use the version vendored with the project
 gotool.protoc-gen-go:
-	mkdir -p $(GOPATH)/src/github.com/golang/protobuf/
-	cp -R $(GOPATH)/src/github.com/hyperledger/fabric/vendor/github.com/golang/protobuf/ $(GOPATH)/src/github.com/golang/
-	go install github.com/golang/protobuf/protoc-gen-go
-	rm -rf $(GOPATH)/src/github.com/golang/protobuf
+	@echo "Building github.com/golang/protobuf/protoc-gen-go -> protoc-gen-go"
+	@mkdir -p $(TMP_GOPATH)/src/github.com/golang/protobuf/
+	@cp -R $(GOPATH)/src/github.com/hyperledger/fabric/vendor/github.com/golang/protobuf/* $(TMP_GOPATH)/src/github.com/golang/protobuf
+	@GOPATH=$(abspath $(TMP_GOPATH)) go install github.com/golang/protobuf/protoc-gen-go
 
 # Default rule for gotools uses the name->path map for a generic 'go get' style build
 gotool.%:
 	$(eval TOOL = ${subst gotool.,,${@}})
-	@echo "Building $(TOOL)"
-	go get ${go.fqp.${TOOL}}
+	@echo "Building ${go.fqp.${TOOL}} -> $(TOOL)"
+	@GOPATH=$(abspath $(TMP_GOPATH)) go get ${go.fqp.${TOOL}}
 
-$(GOPATH)/bin/%:
-	$(eval TOOL = ${subst $(GOPATH)/bin/,,${@}})
+$(GOBIN)/%:
+	$(eval TOOL = ${subst $(GOBIN)/,,${@}})
 	@$(MAKE) gotool.$(TOOL)
 
 .PHONY: clean
 clean:
-	-@rm -f $(GOTOOLS_BIN) ||:
+	-@rm -rf $(OBJDIR)

scripts/goUnitTests.sh

@@ -18,6 +18,7 @@ echo "Running unit tests using $IMAGE"
 echo -n "Obtaining list of tests to run.."
 # Some examples don't play nice with `go test`
 PKGS=`go list github.com/hyperledger/fabric/... | grep -v /vendor/ | \
+                                                  grep -v /build/ | \
 	                                          grep -v /examples/chaincode/chaintool/ | \
 						  grep -v /examples/chaincode/go/asset_management | \
 						  grep -v /examples/chaincode/go/utxo | \