From: Rob Landley [mailto:rob@landley.net]
Sent: Tuesday, July 19, 2022 4:15 PM
On 7/19/22 07:26, Roberto Sassu wrote:

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P.P.S. If you want to run a command other than /init out of initramfs or initrd,
use the rdinit=/run/this option. Note the root= overmount mechanism is
completely different code and uses the init=/run/this argument instead,

which

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means nothing to initramfs. Again, specifying root= says we are NOT staying

in

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initramfs.

Sorry, it was some time ago. I have to go back and see why we needed
a separate option.

Did I mention that init/do_mounts.c already has:

__setup("rootfstype=", fs_names_setup);

It is consumed by dracut too, for the real root filesystem.

[...]

Lots of systems running from initramfs already DON'T have a root=, so you're
saying dracut being broken when there is no root= is something to work around
rather than fix in dracut, even though it's been easy to create a system without
a root= for a decade and a half already...

If there is a possibility that root= or rootfstype= are used by
someone else, I would not count on those to make a selection
of the filesystem for rootfs.

On the other hand, what can go wrong in having a dedicated,
not used by anyone option to do this job?

Thanks

Roberto