+(dhcpd): added static IP for MacOS

util/helpers.go

@@ -0,0 +1,59 @@
+package util
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path"
+	"runtime"
+	"strings"
+)
+
+// ---------------------
+// general helpers
+// ---------------------
+
+// fileExists returns TRUE if file exists
+func FileExists(fn string) bool {
+	_, err := os.Stat(fn)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+// runCommand runs shell command
+func RunCommand(command string, arguments ...string) (int, string, error) {
+	cmd := exec.Command(command, arguments...)
+	out, err := cmd.Output()
+	if err != nil {
+		return 1, "", fmt.Errorf("exec.Command(%s) failed: %s", command, err)
+	}
+
+	return cmd.ProcessState.ExitCode(), string(out), nil
+}
+
+// ---------------------
+// debug logging helpers
+// ---------------------
+func FuncName() string {
+	pc := make([]uintptr, 10) // at least 1 entry needed
+	runtime.Callers(2, pc)
+	f := runtime.FuncForPC(pc[0])
+	return path.Base(f.Name())
+}
+
+// SplitNext - split string by a byte and return the first chunk
+// Whitespace is trimmed
+func SplitNext(str *string, splitBy byte) string {
+	i := strings.IndexByte(*str, splitBy)
+	s := ""
+	if i != -1 {
+		s = (*str)[0:i]
+		*str = (*str)[i+1:]
+	} else {
+		s = *str
+		*str = ""
+	}
+	return strings.TrimSpace(s)
+}