[Bug 277886] ZFS boot loader gives up too easily on unsupported zpool flags

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277886

Warner Losh <imp@FreeBSD.org> changed:

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                 CC|                            |imp@FreeBSD.org

--- Comment #4 from Warner Losh <imp@FreeBSD.org> ---
efibootmgr makes it harder to find the right loader.efi...  You'd need to look
at the kenv vars we set to see what was actually booted...

Though, to be honest, maybe we just take a page from that and have the boot
loader export all the ZFS features in the read only set. We can use *THAT* to
know whether or not to update. Nothing exported, then you gotta force maybe? Or
we hard code the list the day the feature is committed (though it wouldn't save
you from older code, so maybe the list of the 13.2 loader.efi). Having the boot
loader export what it can do...

Though if you *do* update loader.efi, then this won't work, so maybe not.
Unless we update the list from install, though we don't know for sure what's
going to boot...

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