Re: [ANNOUNCEMENT] dracut-0.5

[Jeremy Katz <katzj-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On Friday, July 17 2009, Harald Hoyer said:

> - more kernel command line parameters (see also man dracut(8))
> - a helper tool, which generates the kernel command line (dracut-gencmdline)
[snip]
> rd_DM_UUID, rd_LUKS_UUID, rd_MD_UUID help you, if dracut does more than 
> you want in its automatic mode. So if you want to be more specific on 
> what dracut is allowed to assemble, uncrypt etc. just specify the exact 
> parameters.

Hmmm, requiring/expecting this much in the way of kernel parameters in
the default case feels like it has a likelihood of hitting
architecture-specific limits on command line size.  I know that's been a
problem in a lot of cases on s390 in the past.

I wonder if its worth supporting reading these first from a file "in the
initramfs"[1] and then letting /proc/cmdline act as overrides of that
ala the way the s390 people have historically done .parm files[2].

Jeremy

[1] It doesn't actually need to be in the packaged initramfs -- we could
generate a host-specific file that's added as a second initramfs via the
bootloader config.  dracut doesn't need to know its from a second file
but that seems like it would be straight-forward enough and help the
problem.  It also could be used for things like keeping passwords out of
the kernel command line
[2] I can't believe I'm actually suggesting following something s390 has
done :-)
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