[OpenWrt-Devel] [PATCH] fstools: block: make extroot mount preparation more robust

[Val Kulkov]

On Tue, 9 Apr 2019 at 14:08, Kenneth J. Miller <ken at miller.ec> wrote:
>
> The extroot mount preparation code for r/w rootfs overlay discovery, and
> determining the user-defined /etc/config/fstab location within, would only
> discover overlays residing on JFFS2 or UBIFS MTD storage.
>
> This led to attempts at loading the uci fstab configuration without the
> required /tmp/overlay directory prefix on devices with a non-MTD r/w
> rootfs overlay, and thus failure to find any custom fstab /overlay extroot
> entries on PREINIT.
> (example: the default openwrt eMMC partition layout on the zyxel nbg6817)
>
> Futher, with UBIFS_EXTROOT enabled (fstools package default), and no MTD
> rootfs partitions present, check_extroot would not attempt rootfs
> discovery on block devices, such as the ext4 mmcblk rootfs overlay on the
> nbg6817.
>
> With this patch:
> 1) main_extroot now attempts to load uci fstab configuration from an
>    already mounted overlay, before defaulting to the prefix-less uci
>    config dir when no MTD rootfs partitions are detected.
> 2) check_extroot now also attempts to find rootfs partitions on block
>    devices when no MTD rootfs partitions are detected.
>
> Fixes: FS#2231
> Ref: https://bugs.openwrt.org/index.php?do=details&task_id=2231
> Signed-off-by: Kenneth J. Miller <ken at miller.ec>

This patch makes it possible to mount extroot overlay on x86_64.

Tested-by: Val Kulkov <val.kulkov at gmail.com>

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