chore: add local shellcheck tools (#521)

Signed-off-by: bitliu <bitliu@tencent.com>

tools/make/golang.mk

@@ -12,7 +12,7 @@ GO_VERSION = $(shell grep -oE "^go [[:digit:]]*\.[[:digit:]]*" go.mod | cut -d'
 # Build the target binary in target platform.
 # The pattern of build.% is `build.{Platform}.{Command}`.
 # If we want to build envoy-gateway in linux amd64 platform, 
-# just execute make build.linux_amd64.envoy-gateway.
+# just execute make go.build.linux_amd64.envoy-gateway.
 .PHONY: go.build.%
 go.build.%:
 	$(eval COMMAND := $(word 2,$(subst ., ,$*)))

tools/make/lint.mk

@@ -58,12 +58,13 @@ lint.whitenoise: $(tools/whitenoise)
 	@echo Running WhiteNoise linter ...
 	$(tools/whitenoise)
 
-# GitHub has shellcheck pre-installed
+
 .PHONY: lint.shellcheck
 lint: lint.shellcheck
-lint.shellcheck:
+lint-deps: $(tools/shellcheck)
+lint.shellcheck: $(tools/shellcheck)
 	@echo Running Shellcheck linter ...
-	@shellcheck tools/hack/*.sh
+	$(tools/shellcheck) tools/hack/*.sh
 
 .PHONY: gen-check
 gen-check: generate manifests

tools/make/tools.mk

@@ -33,3 +33,23 @@ $(tools.bindir)/%.d/venv: $(tools.srcdir)/%/requirements.txt
 	$@/bin/pip3 install -r $< || (rm -rf $@; exit 1)
 $(tools.bindir)/%: $(tools.bindir)/%.d/venv
 	ln -sf $*.d/venv/bin/$* $@
+
+ifneq ($(GOOS),windows)
+# Shellcheck
+# ==========
+#
+tools/shellcheck = $(tools.bindir)/shellcheck
+SHELLCHECK_VERSION=0.8.0
+SHELLCHECK_ARCH=$(shell uname -m)
+# shellcheck uses the same binary on Intel and Apple Silicon Mac.
+ifeq ($(GOOS),darwin)
+SHELLCHECK_ARCH=x86_64
+endif
+SHELLCHECK_TXZ = https://github.com/koalaman/shellcheck/releases/download/v$(SHELLCHECK_VERSION)/shellcheck-v$(SHELLCHECK_VERSION).$(GOOS).$(SHELLCHECK_ARCH).tar.xz
+tools/bin/$(notdir $(SHELLCHECK_TXZ)):
+	mkdir -p $(@D)
+	curl -sfL $(SHELLCHECK_TXZ) -o $@
+%/bin/shellcheck: %/bin/$(notdir $(SHELLCHECK_TXZ))
+	mkdir -p $(@D)
+	tar -C $(@D) -Jxmf $< --strip-components=1 shellcheck-v$(SHELLCHECK_VERSION)/shellcheck
+endif