#2550: Udev bootscript enhancement
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Reporter: mickb | Owner: lfs-b...@…
Type: enhancement | Status: new
Priority: normal | Milestone: 6.6
Component: Bootscripts | Version: SVN
Severity: minor | Keywords:
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Comment(by br...@…):
> I think it's opportune to check /dev in the same way, because an
initramfs which uses udev (or mdev in busybox) may already have mounted it
(and moved it to the new root with a "mount -o move" command).
- Frankly, with all the recent kernel changes around sysfs, I'm surprised
mdev works. :-) But apart from that...
- In initramfs, you can't (reliably anyway) keep groups. They might come
from files, which works, but they might also come from NIS/LDAP/whatever,
which won't work. That's why my initramfs generator strips out all the
GROUP= settings from the rules before copying them in. And I believe that
means you have to rebuild /dev after booting anyway -- so why not just
unmount it inside initramfs before running switch-root? Then it doesn't
matter what the bootscript does, because it gets the same setup whether
there's an initramfs or not.
Or at least, that's why I did it that way...
(I should note: I *explicitly* don't use busybox for an initramfs.
There's no point: you delete everything and kill all processes anyway
after it's done mounting the rootfs. And it just makes life inside the
initramfs harder, and adds package dependencies.)
> mount -n -t tmpfs tmpfs /dev -o size=256k
Maybe... though I'm not convinced it's required, given the directory
permissions (if root screws themselves over by creating a too-large file,
so what? there are hundreds of ways of doing that, and most are simpler...
:-) ), and the downside of getting it too small is a huge problem halfway
through "udevadm trigger".
> mode=755
Isn't that the default? The current scripts don't mention mode= at all,
and my /dev is 0755 already. (From mount(8): mode= for tmpfs sets the
initial mode of the mountpoint directory after the mount finishes.
Presumably nothing else changes that directory...)
--
Ticket URL: <http://wiki.linuxfromscratch.org/lfs/ticket/2550#comment:1>
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