v0.1.9 kv flag added, unix and nofs build tags, heartbeat and rotation filename and test update

storage_unix.go

@@ -0,0 +1,30 @@
+//go:build unix
+
+package log
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// getDiskFreeSpace retrieves available disk space for the given path
+func (l *Logger) getDiskFreeSpace(path string) (int64, error) {
+	var stat syscall.Statfs_t
+	info, err := os.Stat(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, fmtErrorf("log directory '%s' does not exist for disk check: %w", path, err)
+		}
+		return 0, fmtErrorf("failed to stat log directory '%s': %w", path, err)
+	}
+	if !info.IsDir() {
+		path = filepath.Dir(path)
+	}
+
+	if err := syscall.Statfs(path, &stat); err != nil {
+		return 0, fmtErrorf("failed to get disk stats for '%s': %w", path, err)
+	}
+	// Explicit cast to int64 to satisfy both Linux and FreeBSD
+	return int64(stat.Bavail) * int64(stat.Bsize), nil
+}