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

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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

(From OE-Core rev: 13a057d6ffc3110f891224d7af9455b53581e8a8)

Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Claudius Heine
2022-03-10 14:13:29 +01:00
committed by Richard Purdie
parent 3653b9d37a
commit 6dd32f4a3b
1 changed files with 1 additions and 0 deletions
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1
meta/files/overlayfs-etc-preinit.sh.in
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@@ -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