On avance...

fileutils/iswritable.go

@@ -0,0 +1,27 @@
+package fileutils
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func IsWriteable(path string) bool {
+	info, err := os.Stat(path)
+	if err == nil {
+		// File exists, check owner write permission
+		return info.Mode().Perm()&0200 != 0
+	}
+	if os.IsNotExist(err) {
+		// File does not exist, check if parent directory is writable
+		dir := filepath.Dir(path)
+		if dir == "" {
+			dir = "." // fallback
+		}
+		dirInfo, err := os.Stat(dir)
+		if err != nil {
+			return false
+		}
+		return dirInfo.IsDir() && dirInfo.Mode().Perm()&0200 != 0
+	}
+	return false
+}