Fix building zot natively on FreeBSD (#3247)

fix: allow zot to build on a FreeBSD host (#3246)

The build works as long as the protoc package is installed on the build
host. This also fixes lint checks when building on FreeBSD, working
around common lint complaints caused by the fact that rlim_t is int64 on
FreeBSD.

Signed-off-by: Doug Rabson <dfr@rabson.org>

Makefile

@@ -123,7 +123,7 @@ build-metadata: $(if $(findstring ui,$(BUILD_LABELS)), ui)
 	go list $(GO_CMD_TAGS) -f '{{ join .GoFiles "\n" }}' ./... | sort -u
 
 .PHONY: gen-protobuf
-gen-protobuf: check-not-freebds $(PROTOC)
+gen-protobuf: $(PROTOC)
 	$(PROTOC) --experimental_allow_proto3_optional \
 		--proto_path=$(TOP_LEVEL)/pkg/meta/proto \
 		--go_out=$(TOP_LEVEL)/pkg/meta/proto \
@@ -612,12 +612,6 @@ ifneq ($(shell go env GOOS),linux)
 	$(error makefile target can be run only on linux)
 endif
 
-.PHONY: check-not-freebds
-check-not-freebds:
-ifeq ($(shell go env GOOS),freebsd)
-  $(error makefile target can't be run on freebsd)
-endif
-
 .PHONY: check-compatibility
 check-compatibility:
 ifeq ($(OS),freebsd)

pkg/api/runtime.go

@@ -20,7 +20,7 @@ func DumpRuntimeParams(log log.Logger) {
 
 	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
 	if err == nil {
-		evt = evt.Uint64("max. open files", uint64(rLimit.Cur)) //nolint: unconvert // required for *BSD
+		evt = evt.Uint64("max. open files", uint64(rLimit.Cur)) //nolint: unconvert,gosec // required for *BSD
 	}
 
 	if content, err := os.ReadFile("/proc/sys/net/core/somaxconn"); err == nil {

pkg/cli/server/stress_test.go

@@ -193,7 +193,7 @@ func worker(id int, zotPort, rootDir string) {
 	}
 }
 
-func setMaxOpenFilesLimit(limit uint64) (uint64, error) {
+func setMaxOpenFilesLimit(limit test.RlimT) (test.RlimT, error) {
 	var rLimit syscall.Rlimit
 
 	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)

pkg/test/common/rlimit_freebsd.go

@@ -0,0 +1,3 @@
+package common
+
+type RlimT = int64

pkg/test/common/rlimit_linux.go

@@ -0,0 +1,3 @@
+package common
+
+type RlimT = uint64