Fixed windows compatibility

disk.go

@@ -0,0 +1,27 @@
+//go:build !windows
+// +build !windows
+
+package main
+
+import (
+	"path/filepath"
+	"syscall"
+)
+
+func getTotalDiskSpace(cachePath string) uint64 {
+	var stat syscall.Statfs_t
+
+	absPath, err := filepath.Abs(cachePath)
+	if err != nil {
+		printErr("Failed to resolve absolute path for: %s", cachePath)
+		return 0
+	}
+
+	err = syscall.Statfs(absPath, &stat)
+	if err != nil {
+		printErr("Failed to retrieve filesystem stats for: %s", absPath)
+		return 0
+	}
+
+	return stat.Blocks * uint64(stat.Bsize)
+}