[RFC] Advice re auto-extroot for EcoNet platform

[Michael Richardson]

Caleb James DeLisle <cjd at cjdns.fr> wrote:
    > I see 3 possible ways around this:

    > A. Add USB symbols to config-6.12 for EcoNet - Not very reusable to other
    > platforms, and hard to turn off when extroot is not wanted

How many bytes impact?

    > B. Submit a PR to add a config option to make all kmods builtin if they're in
    > the base image - Then the extroot option can depend on this.

That's even a bigger hit, right?

    > C. Possibly a way to generate kmod-builtin-xxx for every kmod-xxx (?)

    > discussion. Furthermore, making all of the modules built-in has been shown to
    > have a significant amount of space-savings (
    > https://openwrt.org/docs/guide-user/additional-software/saving_space#making_all_kernel_modules_built-in
    > ) so that flag might be worth something to others as well.

Oh, so it's a overwall win by removing .ko files from the rootfs.

    > The second question is what is the right way to handle devices which have a
    > small JFFS or UBI section in addition to the extroot? If it exists at the
    > time the extroot is first mounted, we can copy files over, but if we boot
    > with the extroot removed, data will be stored there again and it will go out
    > of sync. We can imagine creating an init script which prints a warning in
    > this case, but the risk will always be present. My preference, because
    > I

Panic, flash available LEDs?
extroot seems like an "us" problem, not a user problem.
Anyone likely to do it, is likely aware of this list.
Sure, some of us might do this for someone else... hide the key with black tape.

{I have used USB keys that were barely bigger than the connector for white
label router platforms that ran essentially from ram.  Customer then wanted
RAID for the USB keys :-).  Customers also couldn't even see some of them, as
some MBs have USB slots inside 1U}

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