Re: [PATCH] rootfs: do not expose /sys/firmware while building root file-systems

[Baurzhan Ismagulov <ibr@radix50.net>]

On 2025-06-17 14:35, 'Cedric Hombourger' via isar-users wrote:
> We need /sys while assembling the target root file-system but it exposes
> more than the build really needs. Some maintainer scripts (e.g. mdmadm)
> check /sys/firmware/efi/efivars while configuring themselves. This would
> normally be fine but for Isar builds, any information extracted from there
> is for the host doing the build and not for the target we are building for.
> In addition, packages seeing /sys/firmware/efi will mount efivars there
> and will cause do_rootfs_umount to fail unmounting /sys (because of that
> extra mount). By mounting a (small) tmpfs as /sys/firmware in the root
> file-system, we hide host details from the build; that extra mount needs
> to be removed before we attempt to unmount /sys (but we are in control).

Applied to next, thanks.

With kind regards,
Baurzhan

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