[OpenWrt-Devel] [PATCH] fstools: add a hook before mounting the overlay

[Alin Năstac]

On Wed, Oct 9, 2019 at 4:41 PM John Crispin <john at phrozen.org> wrote:
>
>
> On 09/10/2019 16:34, Alin Năstac wrote:
> > On Wed, Oct 9, 2019 at 2:59 PM John Crispin <john at phrozen.org> wrote:
> >>
> >> On 09/10/2019 14:41, Alin Nastac wrote:
> >>> Scripts located in the directory /lib/mount_root will be executed
> >>> before mounting the overlay.
> >>>
> >>> Signed-off-by: Alin Nastac <alin.nastac at gmail.com>
> >> Hi,
> >>
> >> should it not be /etc/mount_root.d/ ? what do you need this for if I may
> >> ask ?
> >>
> >> further comments inline ...
> >>
> >>       John
> >>
> > Hi John,
> >
> > My target is dual bank and I need to copy parts of the customization
> > from the old bank after upgrade.
>
> please dont remove the CC tot he mailing list
Sorry, I pushed the wrong reply button.

> I dont understamd this part, should sysupgrade not be able to handle
> this for you ?

Well, it is not that straightforward as saving & restoring the old
configuration files. Only parts of the UCI configuration must be
migrated. For instance, UCI option a.b.c must be copied from the old
image, but a.b.d must be reset to the value found in the new image.

> > To resume your observations:
> >   - scripts must be relocated to /etc/mount_root.d/
> >   - use runqueue API
> >   - implement the necessary functions in overlay.c
> > Would that be OK? If so, I will be back with a 2nd version of this patch.
>
> I would first like to understand the use-case
>
>      John
>
> >
> > Alin

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