Gentoo Archives: gentoo-dev

From: "Robin H. Johnson" <robbat2@g.o>
To: gentoo-dev@l.g.o
Subject: Re: [gentoo-dev] Re: newsitem: unmasking udev-181
Date: Sun, 11 Mar 2012 22:58:29
In Reply to: [gentoo-dev] Re: newsitem: unmasking udev-181 by Rich Freeman
On Sat, Mar 10, 2012 at 09:53:25PM -0500, Rich Freeman wrote:
> On Sat, Mar 10, 2012 at 9:27 PM, William Hubbs <williamh@g.o> wrote: > > here is the udev 181 unmasking news item. > > > > If all goes well, this will be committed to the tree ?on 3/14 UTC. > > I guess this might be OK for unstable, but before this goes stable we > really need to improve the docs around this. As far as I can tell > neither the genkernel nor dracut docs have specific instructions about > how to handle mounting /usr. Since having a separate /usr is often > the result of having a more complex configuration (nfs, lvm, mdraid, > etc), instructions explaining how things work and how to handle > variations is pretty important. Perhaps genkernel automagically does > the right thing in some cases, but I know that dracut does not unless > you properly configure it. I doubt either tool will handle more > complex situations without some scripting.
With the new versions of genkernel as specified in the news item, you do NOT need any specific instructions about /usr. Just upgrade your genkernel and openrc, and (re)build your initramfs, done.
> Again, this is likely more of a concern before this is stabilized. > However, knowing what I went through to get my bind-mounted /usr on > LVM+mdraid working with dracut, I can imagine that any unstable users > with tricky setups could face a fun weekend.
Your bind-mount /usr and a symlink at /usr to /home/usr are the most troublesome cases for genkernel that I'm aware of. For both of those cases, just add extra lines to /etc/initramfs.mounts should suffice your needs. I realized that I hadn't given much documentation in that file, so I added a much more detailed example in genkernel-3.4.25-r1. If you could please test your LVM+MDRAID+bind-mount setup with genkernel-3.4.25-r1, I'd like to know your results. genkernel --lvm --mdadm should cover most of it. -- Robin Hugh Johnson Gentoo Linux: Developer, Trustee & Infrastructure Lead E-Mail : robbat2@g.o GnuPG FP : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85