Allow unit tests on non-Linux OS

cmd/runmqserver/mqconfig.go

@@ -23,21 +23,8 @@ import (
 	"strings"
 
 	"github.com/ibm-messaging/mq-container/internal/capabilities"
-	"golang.org/x/sys/unix"
 )
 
-// fsTypes contains file system identifier codes.
-// This code will not compile on some operating systems - Linux only.
-var fsTypes = map[int64]string{
-	0x61756673: "aufs",
-	0xef53:     "ext",
-	0x6969:     "nfs",
-	0x65735546: "fuse",
-	0x9123683e: "btrfs",
-	0x01021994: "tmpfs",
-	0x794c7630: "overlayfs",
-}
-
 func logBaseImage() error {
 	buf, err := ioutil.ReadFile("/etc/os-release")
 	if err != nil {
@@ -109,22 +96,6 @@ func readMounts() error {
 	return nil
 }
 
-func checkFS(path string) {
-	statfs := &unix.Statfs_t{}
-	err := unix.Statfs(path, statfs)
-	if err != nil {
-		log.Println(err)
-		return
-	}
-	t := fsTypes[statfs.Type]
-	switch t {
-	case "aufs", "overlayfs", "tmpfs":
-		log.Fatalf("Error: %v uses unsupported filesystem type %v", path, t)
-	default:
-		log.Printf("Detected %v has filesystem type '%v'", path, t)
-	}
-}
-
 func logConfig() {
 	log.Printf("CPU architecture: %v", runtime.GOARCH)
 	if runtime.GOOS == "linux" {

cmd/runmqserver/mqconfig_linux.go

@@ -0,0 +1,36 @@
+// +build linux
+
+package main
+
+import (
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/sys/unix"
+)
+
+// fsTypes contains file system identifier codes.
+// This code will not compile on some operating systems - Linux only.
+var fsTypes = map[int64]string{
+	0x61756673: "aufs",
+	0xef53:     "ext",
+	0x6969:     "nfs",
+	0x65735546: "fuse",
+	0x9123683e: "btrfs",
+	0x01021994: "tmpfs",
+	0x794c7630: "overlayfs",
+}
+
+func checkFS(path string) {
+	statfs := &unix.Statfs_t{}
+	err := unix.Statfs(path, statfs)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	t := fsTypes[statfs.Type]
+	switch t {
+	case "aufs", "overlayfs", "tmpfs":
+		log.Fatalf("Error: %v uses unsupported filesystem type %v", path, t)
+	default:
+		log.Printf("Detected %v has filesystem type '%v'", path, t)
+	}
+}

cmd/runmqserver/mqconfig_other.go

@@ -0,0 +1,9 @@
+// +build !linux
+
+package main
+
+// Dummy version of this function, only for non-Linux systems.
+// Having this allows unit tests to be run on other platforms (e.g. macOS)
+func checkFS(path string) {
+	return
+}