files: overlayfs-etc: add overlay mount options to preinit

Overlayfs-etc is useful if the rootfs is read-only. One reason to have
the rootfs read-only is to allow image based updating.

Image based updating will change the underlying root file system, which
is unsupported by overlayfs when with some mount options [1].

This disables those options.

[1] https://www.kernel.org/doc/html/latest/filesystems/overlayfs.html?highlight=overlayfs#changes-to-underlying-filesystems

Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/files/overlayfs-etc-preinit.sh.in b/meta/files/overlayfs-etc-preinit.sh.in
index e5f5001a058936a5dc233358bfe440712d3a9763..43c9b04eb9cc94fda64698fb49e64e49ad447531 100644 (file)
--- a/meta/files/overlayfs-etc-preinit.sh.in
+++ b/meta/files/overlayfs-etc-preinit.sh.in
@@ -26,6 +26,7 @@ then
         -o upperdir={OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/upper \
         -o lowerdir=/etc \
         -o workdir={OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/work \
+        -o index=off,xino=off,redirect_dir=off,metacopy=off \
         {OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/upper /etc || \
             echo "PREINIT: Mounting etc-overlay failed!"
 else