From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrei Borzenkov <arvidjaar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: Minimal initramfs Modification
Date: Mon, 27 Jul 2015 07:10:58 +0300
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To: Rick Tillery <rtillerywork-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Andrew Udvare <audvare-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, initramfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

=D0=92 Fri, 24 Jul 2015 10:26:10 -0500
Rick Tillery <rtillerywork-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> =D0=BF=D0=B8=D1=88=D0=B5=D1=82:

>=20
> It's at that point that I looked closer at dracut.  It appears to be
> able to successfully construct the initrd from the existing
> environment.  Additionally, dracut recognizes the entire image,
> including the early_cpio portion (which likewise must be recognized b=
y
> grub (2?) as well), when used to examine the initrd/initramfs file.
>=20

Bootloaders do not care about content of initrd, they just load it in
memory and pass pointer to kernel.

> So back to my original question, can dracut build the image from an
> existing image (possibly unarchived as above), with changes, and
> including the early_cpio portion?

It is not implemented.

>                                   And if not, before I go trying to
> create my own scripts, are there are there any tools that can do this=
?
>=20

Not that I'm aware of. I have the same issue every now and then and it
would be good to have dracut support it. Something like "lsinitrd -x"
to extract archives and dracut options to use existing directories for
early cpio and main initrd.