Disable go modules

go 1.13 by default enables go modules feature, where we use 'dep' tool for
module/package dependency. Till we move to go modules disable(GO111MODULE=off) this.

Makefile

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+GO=GOOS=linux GO111MODULE=off go
 IMPORT_PATH=github.com/intel/pmem-csi
 CMDS=pmem-csi-driver pmem-vgm pmem-ns-init
 TEST_CMDS=$(addsuffix -test,$(CMDS))
@@ -58,21 +59,21 @@ all: build
 # Build all binaries, including tests.
 # Must use the workaround from https://github.com/golang/go/issues/15513
 build: $(CMDS) $(TEST_CMDS)
-	go test -run none ./pkg/... ./test/e2e
+	$(GO) test -run none ./pkg/... ./test/e2e
 
 # "make test" runs a variety of fast tests, including building all source code.
 # More tests are added elsewhere in this Makefile and test/test.make.
 test: build
 
 # Build production binaries.
 $(CMDS):
-	GOOS=linux go build -ldflags '-X github.com/intel/pmem-csi/pkg/[email protected]=${VERSION}' -a -o ${OUTPUT_DIR}/$@ ./cmd/$@
+	$(GO) build -ldflags '-X github.com/intel/pmem-csi/pkg/[email protected]=${VERSION}' -a -o ${OUTPUT_DIR}/$@ ./cmd/$@
 
 # Build a test binary that can be used instead of the normal one with
 # additional "-run" parameters. In contrast to the normal it then also
 # supports -test.coverprofile.
 $(TEST_CMDS): %-test:
-	GOOS=linux go test --cover -covermode=atomic -c -coverpkg=./pkg/... -ldflags '-X github.com/intel/pmem-csi/pkg/$*.version=${VERSION}' -o ${OUTPUT_DIR}/$@ ./cmd/$*
+	$(GO) test --cover -covermode=atomic -c -coverpkg=./pkg/... -ldflags '-X github.com/intel/pmem-csi/pkg/$*.version=${VERSION}' -o ${OUTPUT_DIR}/$@ ./cmd/$*
 
 # The default is to refresh the base image once a day when building repeatedly.
 # This is achieved by passing a fake variable that changes its value once per day.
@@ -111,7 +112,7 @@ print-image-version:
 	@ echo "$(IMAGE_VERSION)"
 
 clean:
-	go clean -r -x
+	$(GO) clean -r -x
 	-rm -rf $(OUTPUT_DIR)
 
 .PHONY: all build test clean $(CMDS) $(TEST_CMDS)

test/test.make

@@ -1,10 +1,10 @@
-TEST_CMD=go test
+TEST_CMD=$(GO) test
 TEST_ARGS=$(IMPORT_PATH)/pkg/...
 SUDO=$(shell [ $$(id -u) -eq 0 ] && echo env || echo sudo)
 
 .PHONY: vet
 test: vet
-	go vet $(IMPORT_PATH)/pkg/...
+	$(GO) vet $(IMPORT_PATH)/pkg/...
 
 # Check resp. fix formatting.
 .PHONY: test_fmt fmt
@@ -60,7 +60,7 @@ RUNTIME_DEPS =
 # We use "go list" because it is readily available. A good replacement
 # would be godeps. We list dependencies recursively, not just the
 # direct dependencies.
-RUNTIME_DEPS += go list -f '{{ join .Deps "\n" }}' ./cmd/pmem-csi-driver |
+RUNTIME_DEPS += $(GO) list -f '{{ join .Deps "\n" }}' ./cmd/pmem-csi-driver |
 
 # This focuses on packages that are not in Golang core.
 RUNTIME_DEPS += grep '^github.com/intel/pmem-csi/vendor/' |
@@ -120,7 +120,7 @@ RUN_E2E = KUBECONFIG=`pwd`/_work/$(CLUSTER)/kube.config \
 	CLUSTER=$(CLUSTER) \
 	TEST_DEPLOYMENTMODE=$(shell source test/test-config.sh; echo $$TEST_DEPLOYMENTMODE) \
 	TEST_DEVICEMODE=$(shell source test/test-config.sh; echo $$TEST_DEVICEMODE) \
-	go test -count=1 -timeout 0 -v ./test/e2e \
+	$(GO) test -count=1 -timeout 0 -v ./test/e2e \
                 -ginkgo.skip='$(subst $(space),|,$(TEST_E2E_SKIP))' \
                 -ginkgo.focus='$(subst $(space),|,$(TEST_E2E_FOCUS))' \
                 -report-dir=$(TEST_E2E_REPORT_DIR)
@@ -131,7 +131,7 @@ test_e2e: start
 .PHONY: run_tests
 test: run_tests run_device_manager_tests
 RUN_TESTS = TEST_WORK=$(abspath _work) \
-	$(TEST_CMD) $(shell go list $(TEST_ARGS) | grep -v pmem-device-manager | sed -e 's;$(IMPORT_PATH);.;')
+	$(TEST_CMD) $(shell $(GO) list $(TEST_ARGS) | grep -v pmem-device-manager | sed -e 's;$(IMPORT_PATH);.;')
 RUN_DM_TESTS = \
     $(TEST_CMD) ./pkg/pmem-device-manager -exec $(SUDO)
 run_tests: _work/pmem-ca/.ca-stamp _work/evil-ca/.ca-stamp
@@ -161,7 +161,7 @@ _work/gocovmerge-$(GOCOVMERGE_VERSION):
 	cd $$tmpdir && \
 	echo "module foo" >go.mod && \
 	go get github.com/wadey/gocovmerge@$(GOCOVMERGE_VERSION) && \
-	go build -o $(abspath $@) github.com/wadey/gocovmerge
+	$(GO) build -o $(abspath $@) github.com/wadey/gocovmerge
 	ln -sf $(@F) _work/gocovmerge
 
 # This is a special target that runs unit and E2E testing and
@@ -189,10 +189,10 @@ _work/coverage.out: _work/gocovmerge-$(GOCOVMERGE_VERSION)
 	$< _work/coverage/* >$@
 
 _work/coverage.html: _work/coverage.out
-	go tool cover -html $< -o $@
+	$(G0) tool cover -html $< -o $@
 
 _work/coverage.txt: _work/coverage.out
-	go tool cover -func $< -o $@
+	$(GO) tool cover -func $< -o $@
 
 .PHONY: coverage
 coverage: