Install golangci-lint if needed

Currently, `golangci-lint` is using in `make test-style` step, but there is no installation step for this tool. It will raise an error in the case of `golangci-lint` is not installed in the local env. This PR aim to install it if needed.

Signed-off-by: Kim Bao Long <longkb@vn.fujitsu.com>

.circleci/config.yml

@@ -15,7 +15,7 @@ jobs:
       - checkout
       - run:
           name: install test dependencies
-          command: .circleci/bootstrap.sh
+          command: make lint
       - run:
           name: test style
           command: make test-style

Makefile

@@ -10,6 +10,8 @@ GOX           = $(GOPATH)/bin/gox
 GOIMPORTS     = $(GOPATH)/bin/goimports
 ARCH          = $(shell uname -p)
 
+GOLANGCI_LINT_VERSION = "1.21.0"
+
 ACCEPTANCE_DIR:=../acceptance-testing
 # To specify the subset of acceptance tests to run. '.' means all tests
 ACCEPTANCE_RUN_TESTS=.
@@ -89,10 +91,19 @@ test-coverage:
 	@ ./scripts/coverage.sh
 
 .PHONY: test-style
-test-style:
+test-style: lint
 	GO111MODULE=on golangci-lint run
 	@scripts/validate-license.sh
 
+.PHONY: lint
+lint:
+	set -euo pipefail
+	cd /
+	GO111MODULE=on
+	curl -sSL https://github.com/golangci/golangci-lint/releases/download/v${GOLANGCI_LINT_VERSION}/golangci-lint-${GOLANGCI_LINT_VERSION}-linux-amd64.tar.gz | tar xz
+	sudo mv golangci-lint-${GOLANGCI_LINT_VERSION}-linux-amd64/golangci-lint /usr/local/bin/golangci-lint
+	rm -rf golangci-lint-${GOLANGCI_LINT_VERSION}-linux-amd64
+
 .PHONY: test-acceptance
 test-acceptance: TARGETS = linux/amd64
 test-acceptance: build build-cross