Add build tag to omit grpc

This is needed so we can build the runc shim without grpc as a
transative dependency.
With this change the runc shim binary went from 14MB to 11MB.
The RSS from an idle shim went from about 17MB to 14MB (back around
where it was in in 1.7).

Signed-off-by: Brian Goff <[email protected]>

Author: cpuguy83

Makefile

@@ -150,6 +150,8 @@ GOTEST ?= $(GO) test
 OUTPUTDIR = $(join $(ROOTDIR), _output)
 CRIDIR=$(OUTPUTDIR)/cri
 
+SHIM_GO_TAGS := --tags no_grpc
+
 .PHONY: clean all AUTHORS build binaries test integration generate protos check-protos coverage ci check help install uninstall vendor release static-release mandir install-man install-doc genman install-cri-deps cri-release cri-cni-release cri-integration install-deps bin/cri-integration.test remove-replace clean-vendor
 .DEFAULT: default
 
@@ -171,7 +173,7 @@ generate: protos
 	@echo "$(WHALE) $@"
 	@PATH="${ROOTDIR}/bin:${PATH}" $(GO) generate -x ${PACKAGES}
 
-protos: bin/protoc-gen-go-fieldpath
+protos: bin/protoc-gen-go-fieldpath bin/go-buildtag
 	@echo "$(WHALE) $@"
 	@find . -path ./vendor -prune -false -o -name '*.pb.go' | xargs rm
 	$(eval TMPDIR := $(shell mktemp -d))
@@ -181,6 +183,7 @@ protos: bin/protoc-gen-go-fieldpath
 	@rm -rf ${TMPDIR} v2
 	go-fix-acronym -w -a '^Os' $(shell find api/ -name '*.pb.go')
 	go-fix-acronym -w -a '(Id|Io|Uuid|Os)$$' $(shell find api/ -name '*.pb.go')
+	bin/go-buildtag -w --tags '!no_grpc' $(shell find api/ -name '*_grpc.pb.go')
 	@test -z "$$(git status --short | grep "api/next.pb.txt" | tee /dev/stderr)" || \
 		$(GO) mod edit -replace=github.com/containerd/containerd/api=./api
 
@@ -230,7 +233,7 @@ cri-integration: binaries bin/cri-integration.test ## run cri integration tests
 # build runc shimv2 with failpoint control, only used by integration test
 bin/containerd-shim-runc-fp-v1: integration/failpoint/cmd/containerd-shim-runc-fp-v1 FORCE
 	@echo "$(WHALE) $@"
-	@CGO_ENABLED=${SHIM_CGO_ENABLED} $(GO) build ${GO_BUILD_FLAGS} -o $@ ${SHIM_GO_LDFLAGS} ${GO_TAGS} ./integration/failpoint/cmd/containerd-shim-runc-fp-v1
+	@CGO_ENABLED=${SHIM_CGO_ENABLED} $(GO) build ${GO_BUILD_FLAGS} -o $@ ${SHIM_GO_LDFLAGS} ${GO_TAGS} ${SHIM_GO_TAGS} ./integration/failpoint/cmd/containerd-shim-runc-fp-v1
 
 # build CNI bridge plugin wrapper with failpoint support, only used by integration test
 bin/cni-bridge-fp: integration/failpoint/cmd/cni-bridge-fp FORCE
@@ -264,7 +267,7 @@ bin/gen-manpages: cmd/gen-manpages FORCE
 
 bin/containerd-shim-runc-v2: cmd/containerd-shim-runc-v2 FORCE # set !cgo and omit pie for a static shim build: https://github.com/golang/go/issues/17789#issuecomment-258542220
 	@echo "$(WHALE) $@"
-	@CGO_ENABLED=${SHIM_CGO_ENABLED} $(GO) build ${GO_BUILD_FLAGS} -o $@ ${SHIM_GO_LDFLAGS} ${GO_TAGS} ./cmd/containerd-shim-runc-v2
+	CGO_ENABLED=${SHIM_CGO_ENABLED} $(GO) build ${GO_BUILD_FLAGS} -o $@ ${SHIM_GO_LDFLAGS} ${GO_TAGS} ${SHIM_GO_TAGS} ./cmd/containerd-shim-runc-v2
 
 binaries: $(BINARIES) ## build binaries
 	@echo "$(WHALE) $@"