From 132ff4320dba21b167aee9ec5888eca265e32897 Mon Sep 17 00:00:00 2001
From: Don Garrett <dgarrett@google.com>
Date: Fri, 12 Nov 2010 15:29:30 -0800
Subject: [PATCH] cros_generate_upload_payload --patch_kernel should mount from
 the source image read only to avoid unintended changes.

Change-Id: Id3a83786f2c1240a4401978c8cacffc0dcb9d66f

BUG=9073
TEST=Ran script with --patch_kernel, verified source image unmodified.
Ran ./image_to_live.sh to verify valid update was generated.

Review URL: http://codereview.chromium.org/4892002
---
 cros_generate_update_payload | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cros_generate_update_payload b/cros_generate_update_payload
index dd0a67c06e..3b5b9f9d6d 100755
--- a/cros_generate_update_payload
+++ b/cros_generate_update_payload
@@ -87,7 +87,7 @@ patch_kernel() {
   offset=$(($offset * 512))
   sudo losetup -o "$offset" "$STATE_LOOP_DEV" "$IMAGE"
   STATE_MNT=$(mktemp -d /tmp/state.XXXXXX)
-  sudo mount "$STATE_LOOP_DEV" "$STATE_MNT"
+  sudo mount --read-only "$STATE_LOOP_DEV" "$STATE_MNT"
   dd if="$STATE_MNT"/vmlinuz_hd.vblock of="$KERN_FILE" conv=notrunc
   sudo umount "$STATE_MNT"
   STATE_MNT=""