github+Makefile: add new action make tidy-module-check

This commit adds `tidy-module` and `tidy-module-check` to make sure the
modules are always tidy.

.github/workflows/main.yml

@@ -131,6 +131,9 @@ jobs:
       - name: check code format
         run: make fmt-check
 
+      - name: check go modules tidiness 
+        run: make tidy-module-check
+
       - name: lint
         run: GOGC=50 make lint
 

Makefile

@@ -246,6 +246,13 @@ lint: docker-tools
 	@$(call print, "Linting source.")
 	$(DOCKER_TOOLS) golangci-lint run -v $(LINT_WORKERS)
 
+tidy-module:
+	echo "Running 'go mod tidy' for all modules"
+	scripts/tidy_modules.sh
+
+tidy-module-check: tidy-module
+	if test -n "$$(git status --porcelain)"; then echo "modules not updated, please run `make tidy-module` again!"; git status; exit 1; fi
+
 list:
 	@$(call print, "Listing commands.")
 	@$(MAKE) -qp | \

scripts/tidy_modules.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+SUBMODULES=$(find . -mindepth 2 -name "go.mod" | cut -d'/' -f2)
+
+
+# Run 'go mod tidy' for root.
+go mod tidy
+
+# Run 'go mod tidy' for each module.
+for submodule in $SUBMODULES
+do
+  pushd $submodule
+
+  go mod tidy
+
+  popd
+done