Re: group ownership in initrd

[Kay Sievers <kay.sievers@vrfy.org>]

On Wed, Jun 22, 2005 at 10:33:17AM -0700, rich turner wrote:
> On Wed, 2005-06-22 at 01:30 +0200, Kay Sievers wrote:
> > On Tue, Jun 21, 2005 at 04:17:54PM -0700, rich turner wrote:
> > > On Wed, 2005-06-22 at 00:50 +0200, Kay Sievers wrote:
> > > > On Tue, Jun 21, 2005 at 03:17:24PM -0700, rich turner wrote:
> > > > > i am starting udev in my initrd and it is creating the devices with the
> > > > > correct MODE permissions but it is not creating it with the correct
> > > > > group permissions.
> > > > > 
> > > > > what i have in my initrd, among other things, is the entire /etc/udev
> > > > > directory and the /sbin/udev and /sbin/udevstart executables. is there
> > > > > something else i am missing that will create my device nodes with the
> > > > > correct user and group ownership?
> > > > 
> > > > Do you use numerical id's? If not, make sure initrd can resolve the name
> > > > to the uid/gid with prepared udev.
> > 
> > > are the numerical id's you refer to the group ownership id's indicated
> > > in the rules file?
> > > 
> > > are you saying that if i want to use udev in an initrd i will need to
> > > include /etc/group (and perhaps /etc/passwd) in the initrd if my
> > > ownership id's are names rather than numbers in my rules files?
> > 
> > Well, how could udev know the numbers? The kernel does not care about
> > your group names and therefore you have to avoid names or provide
> > everything neccessary to resolve it in initrd.

> i must still be missing something.
> 
> i have now included /etc/group and /etc/passwd in my initrd and the
> ownership still is not getting created properly.
> 
> here is the rule that is used for /dev/pty* devices. it is found
> in /etc/udev/rules.d/50-udev.rules:
> KERNEL="pty[pqrstuvwxyzabcdef][0123456789abcdef]", NAME="%k",
> GROUP="tty", MODE="666", OPTIONS="ignore_scripts"

You need to be able to resolve the names:
  o use klibc which does that by default
  o by compiling in a passwd parser to a static glibc build
  o or put the needed shared libs for glibc into your image

Kay


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