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

storage_nofs.go

@@ -0,0 +1,11 @@
+//go:build !unix
+
+package log
+
+import "math"
+
+// getDiskFreeSpace reports unlimited space where statfs is unavailable.
+// Total-size limits still apply; only the free-space check is inert.
+func (l *Logger) getDiskFreeSpace(path string) (int64, error) {
+	return math.MaxInt64, nil
+}