From d467d9fd383019db1f54dd00cd03ca692c059678 Mon Sep 17 00:00:00 2001
From: Nalin Dahyabhai <nalin@redhat.com>
Date: Thu, 27 Jan 2022 15:45:32 -0500
Subject: [PATCH] drivers.NaiveDiffDriver.Changes(): mount the parent read-only

The parent layer, by virtue of being a parent layer isn't going to be
modified, so default to mounting it read-only.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
---
 drivers/fsdiff.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/fsdiff.go b/drivers/fsdiff.go
index a534630df0..b7e681ace4 100644
--- a/drivers/fsdiff.go
+++ b/drivers/fsdiff.go
@@ -138,6 +138,7 @@ func (gdw *NaiveDiffDriver) Changes(id string, idMappings *idtools.IDMappings, p
 	if parent != "" {
 		options := MountOpts{
 			MountLabel: mountLabel,
+			Options:    []string{"ro"},
 		}
 		parentFs, err = driver.Get(parent, options)
 		if err != nil {