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To: gentoo-genkernel <gentoo-genkernel@g.o>
From: Amadeusz Żołnowski <aidecoe@g.o>
Subject: Re: Genkernel / Dracut / ZFS, where to start?
Date: Mon, 04 Jul 2011 21:50:11 +0200
Hello Zac,

Please follow 72 columns standard in e-mail. :-)

Regarding mdev, it was not even taken into account when writing Dracut.
It is very possible that issues arise in such a combination.

I haven't reviewed your code yet, but from what you've described, seems
to be great work!  When I find some more time, I'll review the code and
think how it's best to import it.  Please also contact Alexey Shvetsov
<alexxy@g.o>.  He's working on bringing ZFS to Gentoo.  I'm
CC'ing this reply to him.  (That's why I'm top-posting, don't beat me
guys!)

Thank you for sharing your work and such a good summary!


Cheers,
aidecoe


Excerpts from Zachary Bedell's message of Sun Jul 03 22:37:18 +0200 2011:
> Alas, here I am self-replying a few hours later...
> 
> I figured out how to get everything running properly with the Dracut
> initramfs, though I'm afraid I'm stuck at the 6th stage of debugging
> [1] on this one...  My system didn't have udev set to start at any
> runlevel.  Adding it to boot made everything work properly with both
> the Dracut and classic initramfs.  I haven't the slightest idea how it
> worked with the classic Genkernel initramfs, but I guess I'll take
> it...
> 
> So all told, I have some genkernel patches and some ZFS patches (all
> for the Dracut module) to contribute.  I'll pass along the ZFS changes
> upstream, though I'm not sure if that's something that Dracut would
> eventually want to pull in?  I think for the time being given that
> ZFSonLinux is rather actively evolving, it might make sense to leave
> the modules over there  until things quiet down a bit.  As it is, if
> you install the Dracut branch of Genkernel, Dracut itself, and the git
> version of ZFS, all of the files end up in the right places so
> everything works together.  Merging them into Dracut probably doesn't
> buy anything right now.
> 
> Patches are attached, and everything's in a public git repo if some
> other format is desired.  For the record, this is all released under
> GPL-2 or any later version at your option.
> 
> As far as a summary of changes, here's what I ended up doing:
> 
> https://github.com/pendor/gentoo-zfs-overlay/, branch master
> ebuild: (Versus the stock -9999 ebuild in portage)
>  * Change git to dracut branch of forked repo
>  * Add dep for Dracut
>  * Add use flag based dep for ZFS (explicit on -9999 version for now
>  as there's been no release with the necessary changes)
> 
> 
> https://github.com/pendor/genkernel-zfs, branch dracut
> genkernel: (Versus dracut branch from git.overlays.gentoo.org)
>  * Remove -nonet flag from xsltproc call (couldn't build with it set)
>  * Add 'zfs' to list of Dracut modules in gen_dracut.sh
>  * Add '--zfs' flag to command line & ZFS setting to conf file, update
>  docs to match.
>  * Pass log level to Dracut based on Genkernel's log level
>  * Try to catch Dracut failures and die rather than reporting success
>  after broken initramfs.
> 
> 
> I also made some minor changes to the zfs-9999 ebuild originally taken
> from the Science overlay.  The most important is the creation of
> /etc/hostid if it doesn't exist as Gentoo's hostid binary doesn't
> appear to write that file if it doesn't exist.
> 
> Best regards,
> Zac Bedell
> 
> 
> [1] http://mark.aufflick.com/blog/2005/11/10/six-stages-of-debugging
> 
> On Jul 3, 2011, at 12:33 PM, Zachary Bedell wrote:
> > I've managed to make a bit of progress with getting
> > Genkernel/Dracut/ZFS to all play nicely together.  I'm running into
> > some trouble with devices after the initramfs is actually done, and
> > I'm not sure if I'm just hitting the current limitations of the
> > Genkernel/Dracut branch or if there's something silly I might be
> > doing.  My first suspicion is that Dracut's using udev while the
> > rest of my system is setup for mdev is probably the source of my
> > issues, but my knowledge of the various device manager packages is
> > pretty limited at this point.
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References:
Genkernel / Dracut / ZFS, where to start?
-- Zachary Bedell
Re: Genkernel / Dracut / ZFS, where to start?
-- Amadeusz Żołnowski
Re: Genkernel / Dracut / ZFS, where to start?
-- Zachary Bedell
Re: Genkernel / Dracut / ZFS, where to start?
-- Zachary Bedell
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